REG - Castillo Copper Ltd - High-grade cobalt-zinc potential at Broken Hill
21/03/2022 07:15
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RNS Number : 3679F Castillo Copper Limited 21 March 2022
21 March 2022
CASTILLO COPPER LIMITED
("Castillo" or the "Company")
High-grade cobalt-zinc potential at Broken Hill
Castillo Copper Limited (LSE and ASX: CCZ), a base metal explorer primarily
focused on copper across Australia and Zambia, is delighted to report a
successful trip by the geology team to the core library in Broken Hill, NSW,
where they analysed diamond core from drill-holes BH1 and BH2 at The Sisters
Prospect(1) within the East Zone, BHA Project.
Highlights
· Castillo's geology team re-tested diamond core - from drill-holes BH1
& BH2 at the "The Sisters" Prospect(1) (East Zone, BHA Project) -
available at the core library in Broken Hill, NSW, with encouraging
results:
o Utilising a PXRF analyser - to identify samples for follow up assays -
readings up to 1,705ppm Co and 9.63% Zn were recorded
o More significantly, several wide PXRF intervals (7-9m wide) were
delineated with high-grade cobalt-zinc readings (Figure 1)
o These identified intervals from the BH1 & BH2 core (Appendix B) are
being sent to the laboratory for follow up analysis
The above results are an average of two readings taken for 60 seconds and are
preliminary. They are being used to identify sections for core re-sampling and
subsequent laboratory analyses. They are not being used in the block model and
do not replace laboratory analyses.
FIGURE 1: PRXF INTERVALS BH1 & BH2 - THE SISTERS PROSPECT
Drillhole From To Apparent Thickness (m) Co (ppm) Zn (%)
BH1 11.84 20.89 9.05 859 0.26
106.62 114.36 7.26 946 1.53
116.24 124.66 8.42 897 3.26
124.66 129.54 4.88 370 0.89
BH2 89.35 90.44 1.09 245 1.89
92.66 93.57 0.91 350 1.94
137.29 140.58 3.29 525 2.21
(Note: Refer to Appendices B); Source: CCZ geology team
· The PXRF analysis for BH1 & BH2 is consistent with earlier
assayed sections from the same diamond core (over different depths), with the
best results comprising: 1.8m @ 820ppm Co from 124.7m (BH1) and 1.5m @ 320ppm
Co from 138.4m (BH2)(2) - Refer Appendix C
· There is a primary 1,200m synclinal structure at The Sisters
Prospect(3) - which BH1 intersected - that appears to host high-grade
cobalt-zinc mineralisation: this is now a key target for further drill-testing
· In addition, further forensic work on codifying the 6,380 drill-holes
around the Reefs Tank & Tors Tank Prospects found more evidence of shallow
cobalt mineralisation, with the best intercepts: 7m @ 1,600ppm Co from 30m
(drillhole 1800E1180N); 15m @760ppm Co from 67m (3E51N); 10m @ 520ppm Co from
surface (2925E1240S); and 5m @ 520ppm Co from 45m (TT05W10N)(4)
· The Board is optimistic there is adequate geological data across The
Sisters, Reefs Tank & Tors Tank Prospects to potentially prove up a
primary cobalt JORC 2012 compliant mineral resource estimate
Dr Dennis Jensen, CEO of Castillo Copper, said: "The preliminary results from
analysing The Sisters Prospect's diamond core has delivered Castillo Copper an
excellent outcome. We now have compelling evidence, subject to final assays,
there is high-grade cobalt-zinc mineralisation apparent and a prime target for
future test drilling. Furthermore, the Board believes that, once all the
assays are in from The Sisters Prospect, there will be sufficient data to
potentially prove up a primary global cobalt mineral resource estimate that
complies with the JORC 2012 Code."
HIGH GRADE COBALT-ZINC POTENTIAL
The objective of the trip to the core library in Broken Hill was to find
incremental evidence (from analysing untested diamond core from BH1 & BH2)
to demonstrate the presence of cobalt-zinc mineralisation at The Sisters
Prospect(1).
Using a PXRF analyser, purely to identify parts of the diamond core for follow
up assays, the initial readings returned up to 1,705ppm Co and 9.63% Zn.
Further, there were several wide PXRF intervals that delineated high-grade
cobalt-zinc mineralisation, including (refer Figure 1 & Appendix B):
· 9.05m @ 859ppm Co & o.26% Zn from 11.84m
· 8.42m @897ppm Co & 3.26% Zn from 116.24m
· 7.26m @ 946ppm Co & 1.53% Zn from 106.62m
· 4.88m @ 370ppm Co & 0.89% Zn from 124.66m (Appendix B)
Due to these findings, the identified intervals from BH1 & BH2 diamond
core are being sent to the laboratory for a complete analysis to confirm the
results reconcile with the PXRF observations.
The results are an average of two readings taken for 60 seconds and are
preliminary. They are being used to identify sections for core re-sampling and
subsequent laboratory analyses. They are not being used in the block model and
do not replace laboratory analyses.
FIGURE 2: THE SISTERS PROSPECT, EAST ZONE, BHA PROJECT (Available to view on
PDF version of the announcement)
PHOTO GALLERY: ANALYSING BH1 & BH2 DAIMOND CORE AT BROKEN HILL (Available
to view on PDF version of the announcement)
Previous assays of the diamond core from BH1 & BH2, from different
sections to where the PXRF analysis targeted, returned encouraging results,
with the best intercepts comprising: 1.8m @ 820ppm Co from 124.7m (BH1) and
1.5m @ 320ppm Co from 138.4m (BH2)(2) - refer Appendix C for further details.
As such, when reconciling the historical assays with the recent PXRF results,
it provides a relatively high degree of confidence there is significant
potential to extend the known cobalt mineralisation once verified by assays.
Indeed, according to a previous report(3) there is a primary 1,200m synclinal
structure at The Sisters Prospect - which BH1 intersected - that appears to
host high-grade cobalt-zinc mineralisation. Most historic drilling campaigns
missed this structure completely. Consequently, it is now a key target for
further drill-testing once a timeline is set to undertake an inaugural
drilling campaign at The Sisters Prospect.
FIGURE 3: THE SISTERS HISTORICAL DRILL-HOLES - COBALT PPM BY LABORATORY
ASSAY PROJECT (Available to view on PDF version of the announcement)
Reefs Tank & Tors Tank Prospects
Ongoing work to codify the 6,380 drill-holes around the Reefs Tank & Tors
Tank Prospects - within the defined target area - has found more evidence of
shallow cobalt mineralisation, with the best intercepts: 7m @ 1,600ppm Co from
30m (1800E1180N); 15m @ 760ppm Co from 67m (3E51N); 10m @ 520ppm Co from
surface (2925E1240S); and 5m @ 520ppm Co from 45m (TT05W10N)(4).
Primary cobalt MRE
Assessing the preliminary findings holistically across The Sisters, Reefs Tank
& Tors Tank Prospects, the Board is optimistic there is adequate
geological data to potentially prove up a primary cobalt JORC 2012 compliant
mineral resource estimate.
Next steps
In NSW:
· JORC 2012 compliant mineral resource estimate for the BHA
Project East Zone.
In Queensland:
· Assay results for Arya Prospect.
· Big One Deposit - formalising timing for next drilling
campaign.
In Zambia:
· Complete geophysical report on the Mkushi Project; and
· Complete work on the inaugural drilling campaign for the
Luanshya Project.
In addition to this release, a PDF version with supplementary information and
images can be found on the Company's website:
https://castillocopper.com/investors/announcements/
(https://castillocopper.com/investors/announcements/)
For further information, please contact:
Castillo Copper Limited +61 8 6558 0886
Dr Dennis Jensen (Australia), Chief Executive Officer
Gerrard Hall (UK), Director
SI Capital Limited (Financial Adviser and Corporate Broker) +44 (0)1483 413500
Nick Emerson
Luther Pendragon (Financial PR) +44 (0)20 7618 9100
Harry Chathli, Alexis Gore
About Castillo Copper
Castillo Copper Limited is an Australian-based explorer primarily focused on
copper across Australia and Zambia. The group is embarking on a strategic
transformation to morph into a mid-tier copper group underpinned by its core
projects:
· A large footprint in the Mt Isa copper-belt district, north-west
Queensland, which delivers significant exploration upside through having
several high-grade targets and a sizeable untested anomaly within its
boundaries in a copper-rich region.
· Four high-quality prospective assets across Zambia's copper-belt
which is the second largest copper producer in Africa.
· A large tenure footprint proximal to Broken Hill's world-class
deposit that is prospective for zinc-silver-lead-copper-gold.
· Cangai Copper Mine in northern New South Wales, which is one of
Australia's highest grading historic copper mines.
The group is listed on the LSE and ASX under the ticker "CCZ."
References
1) CCZ ASX Release - 9 March 2022 AND
Glifillan J.F., 1971, Report on Exploration by Falconbridge (Australia) Pty
Ltd on ATP 3091 Broken Hill Area NSW under option from Minerals Recovery
(Australia) N.L., Falconbridge (Australia) Pty Limited, Jan 1971, 93pp
2) CCZ ASX Release - 15 March 2022 and 9
March 2022
3) Gilfillan J.F., 1971, Report on
Exploration by Falconbridge (Australia) Pty Ltd on ATP 3091 Broken Hill Area
NSW under option from Minerals Recovery (Australia) N.L., Falconbridge
(Australia) Pty Limited, Jan 1971, 93pp
4) Leyh, W.R., and Lees T., 1977,
Progress Report on Exploration Licence, No. 846 Iron Blow -Yellowstone Area,
Broken Hill, New South Wales for the six months period ended 29th June 1977,
North Broken Hill Limited, Report GS1976-198, Jul 77, 35pp
AND Leyh, W.R., 1990, Exploration Report for the Third Six Monthly Period
ended 12th June 1990 for EL 3238 (K Tank), Broken Hill District, New South
Wales for the six months period, Pasminco Limited, Report GS1989-226, Jun 90,
22pp AND Main, J.V., and Tucker D.F., 1981, Exploration Report for Six Month
Period 8th November 1980 to 7th May 1981, EL 1106 Rockwell, Broken Hill, NSW,
CRA Exploration Pty Ltd, GS1980-080, Jul 1981, 40pp
Competent Person Statement
The information in this report that relates to Exploration Results for "BHA
Project, East Zone" is based on information compiled or reviewed by Mr Mark
Biggs. Mr Biggs is a director of ROM Resources, a company which is a
shareholder of Castillo Copper Limited. ROM Resources provides ad hoc
geological consultancy services to Castillo Copper Limited. Mr Biggs is a
member of the Australian Institute of Mining and Metallurgy (member #107188)
and has sufficient experience of relevance to the styles of mineralisation and
types of deposits under consideration, and to the activities undertaken, to
qualify as a Competent Person as defined in the 2012 Edition of the Joint Ore
Reserves Committee (JORC) Australasian Code for Reporting of Exploration
Results, and Mineral Resources. Mr Biggs holds an AusIMM Online Course
Certificate in 2012 JORC Code Reporting. Mr Biggs also consents to the
inclusion in this report of the matters based on information in the form and
context in which it appears.
APPENDIX A: BHA PROJECT
Figure A1: West and East Zone - BHA Project (Available to view on PDF version
of the announcement)
APPENDIX B: MAGNETIC SUSCEPTIBILITY AND XRF READINGS
TABLE B1: BH1 AND BH2 - MAGNETIC SUSCEPTIBILITY AND XRF READINGS ON BQ CORE
HoleID SampID From To Thick Mag.Susc. (10(-3) SI) Co (ppm) Cu (ppm) Zn (ppm)
BH1 BH1.1 11.89 12.378 0.488 22 835 2200 2560
BH1 BH1.2 12.378 12.866 0.488 16.7 1350 935 4610
BH1 BH1.3 12.866 13.354 0.488 19.5 255 2585 1135
BH1 BH1.4 13.354 13.964 0.61 11.9 930 1300 915
BH1 BH1.5 13.964 14.33 0.366 33.4 755 380 440
BH1 BH1.6 14.33 15.426 1.096 46.9 450 1090 725
BH1 BH1.7 15.426 16.522 1.096 40.5 670 3605 490
BH1 BH1.8 16.522 17.618 1.096 43.7 1255 120 2970
BH1 BH1.9 17.681 18.777 1.096 35.9 1335 430 9790
BH1 BH1.10 18.777 19.807 1.03 10.5 850 2305 2090
BH1 BH1.11 19.81 20.84 1.03 0.7 665 170 1580
BH1 BH1.12 20.84 21.87 1.03 1.3 1545
BH1 BH1.13 21.87 22.9 1.03 0.9 660 90 3585
BH1 BH1.14 22.9 23.93 1.03 0.4 1600 720 8355
BH1 BH1.15 23.93 24.99 1.06 0.3 230 380
BH1 24.99 99.06 74.07
BH1 BH1.16 99.06 100.95 1.89 0.4 6630
BH1 BH1.17 100.95 102.84 1.89 0.8 2345
BH1 BH1.18 102.84 104.73 1.89 0.5 2625
BH1 BH1.19 104.73 106.62 1.89 368.3 5635 3575
BH1 BH1.20 106.62 108.51 1.89 131 285 10395 10385
BH1 BH1.21 108.51 110.46 1.95 604.7 1500 7215 26565
BH1 BH1.22 110.46 112.41 1.95 2000 990 140 21460
BH1 BH1.23 112.41 114.36 1.95 1801.3 1010 1605 2895
BH1 BH1.24 114.36 116.31 1.95 1906 375 2815
BH1 BH1.25 116.31 118.26 1.95 1644.7 140 260 19365
BH1 BH1.26 118.26 119.29 1.03 168 1600 770 41340
BH1 BH1.27 119.29 120.32 1.03 108.3 1705 735 14485
BH1 BH1.28 120.32 121.35 1.03 1187 920 365 43580
BH1 BH1.29 121.35 122.38 1.03 1479.7 1230 565 96315
BH1 BH1.30 122.38 123.44 1.06 1289 435 485 9205
BH1 BH1.31 123.44 124.66 1.22 97.2 250 560 4035
BH1 BH1.32 124.66 125.88 1.22 238.3 2015 12460
BH1 BH1.33 125.88 127.1 1.22 0.7 370 15620 3925
BH1 BH1.34 127.1 128.32 1.22 107.4 3085 5305
BH1 BH1.35 128.32 129.54 1.22 299.2 40 10560
BH2 BH2.1 75.59 77.48 1.89 0 220 40 3790
BH2 BH2.2 77.48 79.37 1.89 0 30 850
BH2 BH2.3 79.37 81.26 1.89 0 545 1375
BH2 BH2.4 81.26 83.15 1.89 0 330 205 2295
BH2 BH2.5 83.15 85.04 1.89 13.6 45 2610
BH2 BH2.6 85.04 85.46 0.42 0.4 35 2270
BH2 BH2.7 85.46 85.88 0.42 0.3 90 3460
BH2 BH2.8 85.88 86.3 0.42 0.3 765
BH2 BH2.9 86.3 86.72 0.42 0.5 2225
BH2 BH2.10 86.72 87.17 0.45 0.8 860
BH2 BH2.11 87.17 88.26 1.09 0.3 60 2105
BH2 BH2.12 88.26 89.35 1.09 1.8 230 60 1340
BH2 BH2.13 89.35 90.44 1.09 0.2 245 18940
BH2 BH2.14 90.44 91.53 1.09 0.5 240
BH2 BH2.15 91.53 92.66 1.13 0.7 1700
BH2 BH2.16 92.66 93.57 0.91 1 415 19365
BH2 BH2.17 93.53 94.44 0.91 0.4 65 1175
BH2 BH2.18 94.3 95.21 0.91 0.5 410 3465
BH2 BH2.19 95.21 96.12 0.91 0.2 165 5715
BH2 BH2.20 96.12 97.23 1.11 0.5 20 985
BH2 BH2.21 97.23 97.77 0.54 0.3 1625
BH2 BH2.22 97.77 98.31 0.54 0.7 40 1650
BH2 BH2.23 98.31 98.85 0.54 2.1 40 800
BH2 BH2.24 98.85 99.39 0.54 0.9 100 475
BH2 BH2.25 99.39 99.97 0.58 0.4 35 445
BH2 BH2.26 99.97 101.37 1.4 0.3 320 7760
BH2 BH2.27 101.37 102.77 1.4 0.4 85 2875
BH2 BH2.28 102.77 104.17 1.4 0.3 20 1080
BH2 BH2.29 104.17 105.57 1.4 0.5 20 1195
BH2 BH2.30 105.57 106.99 1.42 1.1 30 680
BH2 BH2.31 106.99 108.08 1.09 0.8 90 2270
BH2 BH2.32 108.08 109.17 1.09 0.4 370
BH2 BH2.33 109.17 110.26 1.09 0.5 360
BH2 BH2.34 110.26 111.35 1.09 0.8 145 4090
BH2 BH2.35 111.35 112.47 1.12 1.5 190 4115
BH2 BH2.36 112.47 113.45 0.98 0.6 240 1210
BH2 BH2.37 113.45 114.43 0.98 1.4 220 1830
BH2 BH2.38 114.43 115.41 0.98 0.6 770
BH2 BH2.39 115.41 116.39 0.98 0.4 1685
BH2 BH2.40 116.39 117.35 0.96 0 30 1520
BH2 BH2.41 117.35 118.39 1.04 0.3 685
BH2 118.39 132.89 14.5
BH2 BH2.42 132.89 133.99 1.1 0.4 980
BH2 BH2.43 133.99 135.09 1.1 0.6 830
BH2 BH2.44 135.09 136.19 1.1 244.7 110 1705
BH2 BH2.45 136.19 137.29 1.1 241.7 70 1545
BH2 BH2.46 137.29 138.38 1.09 78.9 445 11205
BH2 BH2.47 138.38 139.48 1.1 52.2 270 15555
BH2 BH2.48 139.48 140.58 1.1 23.5 565 180 6955
BH2 BH2.49 140.58 141.68 1.1 351.7 160 30 1190
BH2 BH2.50 141.68 142.78 1.1 387.3 155 2295
BH2 BH2.51 142.78 143.87 1.09 345.3 50 2300
BH2 143.87 161.24 17.37
BH2 BH2.52 161.24 162.28 1.04 0.2 625
BH2 BH2.53 162.28 163.32 1.04 0 60 2810
BH2 BH2.54 163.32 164.36 1.04 0.1 325
BH2 BH2.55 164.36 165.4 1.04 0.3 865
BH2 BH2.56 165.4 166.42 1.02 0.4 410
Note: PXRF readings to be verified by resampling core intervals and then
conducting laboratory analyses, most likely ME-MS61R (ALS technique) or
similar. Readings are the average of 2 scans held for 60 sec.
Source: CCZ geology team
APPENDIX C: THE SISTERS LABORATORY ANALYSIS
TABLE C1: THE SISTERS LABORATORY ANALYSIS
Drillhole SampID From (m) To (m) Length Ag Au_ppm Co Cu Pb Zn As Bi Pd
BH1 6100 20.57 22.25 1.68 1.4 185 183 46 22
BH1 6101 113.84 115.52 1.68 1.5 1465
BH1 6102 115.52 117.04 1.52 1.6 535
BH1 6103 117.04 118.57 1.52 1.3 410
BH1 6104 118.57 120.09 1.52 1.5 188
BH1 6105 120.09 121.62 1.52 1.5 300
BH1 6106 121.62 123.14 1.52 1.8 84
BH1 6107 123.14 124.66 1.52 1.1 620
BH1 6108 124.66 126.49 1.83 860 19300
BH2 6201 88.39 89.92 1.52 17 60
BH2 6202 89.92 91.44 1.52 22 63
BH2 6203 91.44 92.96 1.52 26 65
BH2 6204 137.16 138.38 1.22 40 20 60
BH2 6205 138.38 139.90 1.52 0.7 320 210 40
BH2 6206 161.54 162.46 0.91 3 2 19
BH2 6207 162.46 163.07 0.61 13 7 26
BH2 6208 163.07 163.98 0.91 4 8 11
BH2 6209 163.98 164.59 0.61 3 2 11
BH2 6210 198.12 198.73 0.61 6 2 16
BH3 6220 67.67 68.28 0.61 0.2 75 70 52 40
BH3 6221 68.28 69.19 0.91 0.1 380 190 64 20
BH3 6222 69.19 70.10 0.91 0.2 115 50 49 20
BH3 6223 70.10 70.41 0.30 0.1 80 20 48 30
BH3 6224 70.41 71.32 0.91 0.1 400 210 58 20
BH3 6225 71.32 71.93 0.61 0.1 150 110 52 25
BH3 6226 71.93 72.54 0.61 0.4 80 30 48 20
BH3 6227 72.54 73.15 0.61 0.3 795 264 72 20
BH3 6228 73.15 73.76 0.61 0.2 405 140 65 25
BH4 6400 35.66 36.58 0.91 1 160 45
BH4 6283 64.92 66.45 1.52 41 550 40 28
BH4 6284 66.45 67.97 1.52 46 10 65 34
BH4 6285 67.97 69.49 1.52 21 10 60 18
BH4 6286 69.49 71.02 1.52 16 5 50 4
BH4 6287 71.02 72.54 1.52 28 5 60 10
BH4 6288 72.54 73.76 1.22 26 5 50 20
RCPS1 S1_00_04 0.00 4.00 4.00 0.5 0.008 41 17 10 28 1 2 0.002
RCPS1 S1_04_08 4.00 8.00 4.00 0.5 0.006 69 73 14 35 1 10 0.001
RCPS1 S1_08_12 8.00 12.00 4.00 0.5 0.098 61 127 15 9 44 14 0.004
RCPS1 S1_12_16 12.00 16.00 4.00 1 0.164 19 180 31 8 30 10 0.007
RCPS1 S1_16_20 16.00 20.00 4.00 1 0.123 27 228 19 8 56 21 0.01
RCPS1 S1_20_24 20.00 24.00 4.00 0.5 0.027 51 247 9 13 62 12 0.002
RCPS1 S1_24_28 24.00 28.00 4.00 0.5 0.006 20 8 7 25 1 9 0.001
RCPS1 S1_28_32 28.00 32.00 4.00 0.5 0.002 13 23 2 26 1 8 0.001
RCPS1 S1_32_36 32.00 36.00 4.00 0.5 0 5 25 2 19 1 9 0
RCPS1 S1_36_37 36.00 37.00 1.00 1 0.001 2 19 2 10 1 8 0
RCPS2 S2_00_04 0.00 4.00 4.00 0.5 0.015 36 123 24 23 1 16 0.002
RCPS2 S2_04_08 4.00 8.00 4.00 0.5 0.027 51 203 33 20 1 14 0.004
RCPS2 S2_08_12 8.00 12.00 4.00 0.5 0.006 32 137 32 16 1 16 0.002
RCPS2 S2_12_16 12.00 16.00 4.00 0.5 0.017 26 233 25 11 12 15 0.003
RCPS2 S2_16_20 16.00 20.00 4.00 0.5 0.04 48 378 18 12 18 15 0.002
RCPS3 S3_00_04 0.00 4.00 4.00 2 0.006 43 31 7 28 3 13 0.002
RCPS3 S3_04_08 4.00 8.00 4.00 1 0.004 43 17 12 35 1 10 0.001
RCPS3 S3_08_12 8.00 12.00 4.00 0.5 0.006 32 23 7 38 1 2 0.002
RCPS3 S3_12_16 12.00 16.00 4.00 0.5 0 30 7 7 21 1 9 0.001
RCPS3 S3_16_20 16.00 20.00 4.00 0.5 0.009 138 228 16 17 4 19 0.002
RCPS4 S4_00_04 0.00 4.00 4.00 0.5 0.002 14 20 6 9 1 2 0.001
RCPS4 S4_04_08 4.00 8.00 4.00 0.5 0.001 12 7 5 12 1 2 0
RCPS4 S4_08_12 8.00 12.00 4.00 0.5 0.002 22 22 7 18 1 2 0.001
RCPS4 S4_12_16 12.00 16.00 4.00 0.5 0.015 45 10 5 27 1 6 0.001
RCPS4 S4_16_20 16.00 20.00 4.00 0.5 0.001 53 2 7 25 1 2 0.001
RCPS4 S4_20_24 20.00 24.00 4.00 0.5 0 34 7 7 25 1 6 0.001
RCPS4 S4_24_28 24.00 28.00 4.00 0.5 0.001 28 420 8 37 1 7 0.001
RCPS4 S4_28_32 28.00 32.00 4.00 1 0.004 12 720 10 32 1 10 0
RCPS4 S4_32_36 32.00 36.00 4.00 2 0.001 27 17 7 26 1 13 0.003
RCPS4 S4_36_38 36.00 38.00 2.00 0.5 0 6 12 5 19 1 7 0
RCPS5 S5_00_04 0.00 4.00 4.00 0.5 0.002 26 71 9 28 1 9 0.003
RCPS5 S5_04_08 4.00 8.00 4.00 0.5 0.004 81 86 26 31 3 15 0.003
RCPS5 S5_08_12 8.00 12.00 4.00 1 0.001 66 13 6 21 1 10 0
RCPS5 S5_12_16 12.00 16.00 4.00 2 0 2 7 6 13 1 11 0
RCPS5 S5_16_20 16.00 20.00 4.00 1 0 2 24 6 10 1 7 0
RCPS5 S5_20_24 20.00 24.00 4.00 2 0 8 11 9 36 1 10 0
RCPS5 S5_24_28 24.00 28.00 4.00 2 0 19 33 10 59 1 13 0.003
RCPS5 S5_28_32 28.00 32.00 4.00 2 0 18 23 7 30 1 12 0.001
RCPS5 S5_32_35 32.00 35.00 3.00 2 0.002 18 12 6 24 1 12 0
RCPS6 S6_00_04 0.00 4.00 4.00 0.5 0.001 7 9 2 13 1 6 0
RCPS6 S6_04_08 4.00 8.00 4.00 1 0.001 35 21 2 28 1 7 0
RCPS6 S6_08_12 8.00 12.00 4.00 2 0.045 86 251 16 99 1 16 0.003
RCPS6 S6_12_15 12.00 15.00 3.00 0.5 0.041 119 438 18 69 1 13 0.003
RCPS7 S7_00_04 0.00 4.00 4.00 0.5 0.006 81 61 15 32 1 14 0.003
RCPS7 S7_04_08 4.00 8.00 4.00 0.5 0.002 40 70 13 13 1 16 0.002
RCPS7 S7_08_12 8.00 12.00 4.00 0.5 0.006 26 62 14 10 1 16 0.003
RCPS8 S8_00_04 0.00 4.00 4.00 0.5 0.004 81 65 12 52 22 8 0.005
RCPS8 S8_04_08 4.00 8.00 4.00 0.5 0.006 38 77 15 8 2 13 0.002
RCPS8 S8_08_12 8.00 12.00 4.00 0.5 0.006 41 39 13 29 5 11 0.006
RCPS8 S8_12_16 12.00 16.00 4.00 0.5 0.012 24 36 6 36 1 9 0.002
RCPS8 S8_16_20 16.00 20.00 4.00 0.5 0 21 12 2 7 1 9 0
Notes: Laboratories were Falconbridge Laboratories, Perth, WA, Geochemical and
Mineralogical Laboratories Pty Ltd, Sydney NSW and SGS Sydney, NSW.
Source: CCZ geology team
APPENDIX D: JORC CODE, 2012 EDITION - TABLE 1
Section 1 Sampling Techniques and Data
(Criteria in this section apply to all succeeding sections.)
Criteria JORC Code explanation Commentary
Sampling techniques · Nature and quality of sampling (e.g., cut channels, random chips, · Surface sampling used in this analysis was all historical from
or specific specialised industry standard measurement tools appropriate to the the period 1964-2018. This includes the 2016 and 2018 Squadron Resources
minerals under investigation, such as down hole gamma sondes, or handheld XRF soil sampling program. The data was a combination of the NSW Geological Survey
instruments, etc.). These examples should not be taken as limiting the broad surface sampling database and historical annual and relinquishment reports
meaning of sampling. revisited and additional data extracted.
· Include reference to measures taken to ensure sample · Reference to these reports is given in the associated geology
representivity and the appropriate calibration of any measurement tools or reports (Biggs (2022a, b, c).
systems used.
· Many of the sampling programs, especially from the 1990's did
· Aspects of the determination of mineralisation that are Material include reference samples and duplicate analyses and other forms of QA/QC
to the Public Report. checking.
· In cases where 'industry standard' work has been done this would · Sampling prior to 1988 generally has higher "below detection
be relatively simple (e.g., 'reverse circulation drilling was used to obtain 1 limits" and less or no QA/QC checks.
m samples from which 3 kg was pulverised to produce a 30g charge for fire
assay'). In other cases, more explanation may be required, such as where there · Regarding historical cores from holes held by the NSW Geological
is coarse gold that has inherent sampling problems. Unusual commodities or Survey across EL 8434 and 8435, selected sections have been reanalysed using
mineralisation types (eg submarine nodules) may warrant disclosure of detailed pXRF. The grades quoted for cored intervals described in Table A1 have been
information. measured using a handheld pXRF Analyser. These grades are indicative grades
only as the pXRF Analyser does not have the same degree of accuracy as
laboratory generated results.
· Sample details from the pXRF machine for Ag, Cu, Co, and Zn are
listed in Table A1, below. The complete results for all elements have been
listed in Appendix 1 of the Geological Summary report.
Drilling techniques · Drill type (e.g. core, reverse circulation, open-hole hammer, · Historical drilling consists of auger, rotary air blast, reverse
rotary air blast, auger, Bangka, sonic, etc.) and details (e.g. core diameter, circulation, and diamond coring. In and around The Sisters model area are
triple or standard tube, depth of diamond tails, face-sampling bit or other twelve (12) drillholes, however it should be noted that the majority of these
type, whether core is oriented and if so, by what method, etc.). are <18m in depth, and the number of holes >100m number around 14.
Complete drilling analyses results are in the process of being compiled, and
hence did not form part of this study.
Drill sample recovery · Method of recording and assessing core and chip sample recoveries · Not applicable in this study, no new holes completed.
and results assessed.
· Measures taken to maximise sample recovery and ensure
representative nature of the samples.
· Whether a relationship exists between sample recovery and grade
and whether sample bias may have occurred due to preferential loss/gain of
fine/coarse material.
Logging · Whether core and chip samples have been geologically and · The drilling that did occur was generally completed to modern-day
geotechnically logged to a level of detail to support appropriate Mineral standards. The preferred exploration strategy in the eighties and early
Resource estimation, mining studies and metallurgical studies. nineties was to drill shallow auger holes to negate the influence of any
Quaternary and Tertiary thin cover.
· Whether logging is qualitative or quantitative in nature. Core
(or costean, channel, etc) photography. · No downhole geophysical logging took place; however, measurements
of magnetic susceptibility were taken on the library core relogged over the
· The total length and percentage of the relevant intersections same intervals as the PXRF readings were taken.
logged.
Sub-sampling techniques and sample preparation · If core, whether cut or sawn and whether quarter, half or all · Not applicable, as no new drilling was undertaken.
core taken.
· If non-core, whether riffled, tube sampled, rotary split, etc and
whether sampled wet or dry.
· For all sample types, the nature, quality, and appropriateness of
the sample preparation technique.
· Quality control procedures adopted for all sub-sampling stages to
maximise representivity of samples.
· Measures taken to ensure that the sampling is representative of
the in-situ material collected, including for instance results for field
duplicate/second-half sampling.
· Whether sample sizes are appropriate to the grain size of the
material being sampled.
Quality of assay data and laboratory tests · The nature, quality and appropriateness of the assaying and · All the historical samples (87) were laboratory tested in various
laboratory procedures used and whether the technique is considered partial or NATA-registered laboratories throughout Australia. Many of the earlier
total. Falconbridge stream sediment and soil samples were analysed by the
Falconbridge internal laboratories.
· For geophysical tools, spectrometers, handheld XRF instruments,
etc, the parameters used in determining the analysis including instrument make · XRF geochemical data taken from field portable XRF Niton.
and model, reading times, calibrations factors applied and their derivation,
etc. · Duration of sampling 60 seconds per filter (2 filters).
· Nature of quality control procedures adopted (eg standards, · Calibration of the unit was carried out on the unit at the start
blanks, duplicates, external laboratory checks) and whether acceptable levels of the sampling at the core library.
of accuracy (i.e. lack of bias) and precision have been established.
· The following elements were analysed; Ag, As, Se, Ca, K, S, Ba,
Sb, Sn, Cd, Pd, Zr, Sr, Rb, Pb, Hg, Zn, W, Cu, Ni, Co, V, Ti, Au, Fe, Mn, Cr,
Sc, Mo, Th, U, Ta.
Verification of sampling and assaying · The verification of significant intersections by either · BH1 and/or BH2 will require twinning to confirm XRF readings.
independent or alternative company personnel.
· None of the historical data has been adjusted.
· The use of twinned holes.
· Documentation of primary data, data entry procedures, data
verification, data storage (physical and electronic) protocols.
· Discuss any adjustment to assay data.
Location of data points · Accuracy and quality of surveys used to locate drill holes · In general, locational accuracy does vary, depending upon whether
(collar and down-hole surveys), trenches, mine workings and other locations the samples were digitised off plans or had their coordinated tabulated.
used in Mineral Resource estimation. Many samples were reported to AGD66 or AMG84 and have been converted to
MGA94.Zone 54
· Specification of the grid system used.
· It is estimated that locational accuracy therefor varies between
· Quality and adequacy of topographic control. 2-50m
Data spacing and distribution · Data spacing for reporting of Exploration Results. · The average sample spacing across the tenure varies per element,
and sample type, as listed in Table A1-1, below:
· Whether the data spacing and distribution is sufficient to
establish the degree of geological and grade continuity appropriate for the
Mineral Resource and Ore Reserve estimation procedure(s) and classifications
applied.
· Whether sample compositing has been applied.
Table D1: EL 8434 and EL 8435 Surface and Drillhole Sampling
Description Number Average Spacing Comments
Stream Sediment 88 185 Includes BCL
Soil 6 54
Surface Rock Chip 22 310
Drilling 87 190 Twelve drillholes in total. Drilling by Falconbridge and Endeavour Minerals
Mineral Occurrences 24 260 Includes quarries and industrial minerals occurrences
· No sample compositing has been applied.
Orientation of data in relation to geological structure · Whether the orientation of sampling achieves unbiased sampling of · The current database does not contain any sub-surface geological
possible structures and the extent to which this is known, considering the logging for The Sisters, which is being compiled (50% complete)
deposit type.
· Geological mapping by various companies has reinforced that the
· If the relationship between the drilling orientation and the strata dips variously between 45 and 80 degrees.
orientation of key mineralised structures is considered to have introduced a
sampling bias, this should be assessed and reported if material.
Sample security · The measures taken to ensure sample security. · The sample security measures, except for the Squadron Resources
work programs is not known. Squadron took samples to their Broken Hill
office and transported samples for analysis to ALS Broken Hill
Audits or reviews · The results of any audits or reviews of sampling techniques and · No audits or reviews have yet been undertaken.
data.
· No sample compositing has been applied.
Orientation of data in relation to geological structure
· Whether the orientation of sampling achieves unbiased sampling of
possible structures and the extent to which this is known, considering the
deposit type.
· If the relationship between the drilling orientation and the
orientation of key mineralised structures is considered to have introduced a
sampling bias, this should be assessed and reported if material.
· The current database does not contain any sub-surface geological
logging for The Sisters, which is being compiled (50% complete)
· Geological mapping by various companies has reinforced that the
strata dips variously between 45 and 80 degrees.
Sample security
· The measures taken to ensure sample security.
· The sample security measures, except for the Squadron Resources
work programs is not known. Squadron took samples to their Broken Hill
office and transported samples for analysis to ALS Broken Hill
Audits or reviews
· The results of any audits or reviews of sampling techniques and
data.
· No audits or reviews have yet been undertaken.
SECTION 2 REPORTING OF EXPLORATION RESULTS
(Criteria listed in the preceding section also apply to this section.)
Criteria JORC Code explanation Commentary
Mineral tenement and land tenure status · Type, reference name/number, location and ownership including EL 8434 is located about 28km east of Broken Hill whilst EL 8435 is 16km east
agreements or material issues with third parties such as joint ventures, of Broken Hill. Both tenures are approximately 900km northwest of Sydney in
partnerships, overriding royalties, native title interests, historical sites, far western New South Wales (Figure A1-2-1).
wilderness or national park and environmental settings.
EL 8434 and EL 8435 were both granted on the 2(nd of) June 2016 to Squadron
· The security of the tenure held at the time of reporting along Resources for a term of five (5) years for Group One Minerals. On the 25(th
with any known impediments to obtaining a licence to operate in the area. of) May 2020, Squadron Resources changed its name to Wyloo Metals Pty Ltd
(Wyloo). In December 2020 the tenure was transferred from Wyloo Metals to
Broken Hill Alliance Pty Ltd a 100% subsidiary company of Castillo Copper
Limited. Both tenures were renewed on the 12(th of) August 2021 for a
further six (6) years and are due to expire on the 2(nd of) June 2027.
EL 8434 lies across two (2) 1:100,000 geology map sheets Redan 7233 and
Taltingan 7234, and two (2) 1:250,000 geology map sheets, SI54-3 Menindee, and
SH54-15 Broken Hill in the county of Yancowinna. EL 8434 consists of one
hundred and eighty-six (186) units) in the Adelaide and Broken Hill
1:1,000,000 Blocks covering an area of approximately 580km(2).
EL 8435 is located on the 1:100,000 geology map sheet Taltingan 7234, and the
1:250,000 geology map sheet SH/54-15 Broken Hill in the county of
Yancowinna. EL 8435 consists of twenty-two (22) units (Table 1) in the
Broken Hill 1:1,000,000 Blocks covering an area of approximately 68km(2).
Access to the tenures from Broken Hill is via the sealed Barrier Highway.
This road runs north-east to south-west through the northern portion of the EL
8434, passes the southern tip of EL 8435 eastern section and through the
middle of the western section of EL 8435. Access is also available via the
Menindee Road which runs north-west to south-east through the southern section
of the EL 8434. The Orange to Broken Hill Rail line also dissects EL 8435
western section the middle and then travels north-west to south-east slicing
through the eastern arm of EL 8434 (Figure A3-2-1).
Figure D1: EL 8434 and EL 8434 General Location Map (Available to view on
PDF version of the announcement)
Exploration done by other parties · Acknowledgment and appraisal of exploration by other parties. Explorers who were actively involved over longer historical periods in various
parts of EL8434 were: - North Broken Hill Ltd, CRAE Exploration, Major Mining
Ltd and Broken Hill Metals NL, Pasminco Exploration Ltd, Normandy Exploration
Ltd, PlatSearch NL/Inco Ltd/ EGC Pty Ltd JV and the Western Plains Gold
Ltd/PlatSearch/EGC Pty Ltd JV.
A comprehensive summary of work by previous explorers was presented in Leyh
(2009). However, more recently, follow-up field reconnaissance of areas of
geological interest, including most of the prospective zones was carried out
by EGC Pty Ltd over the various licenses. This work, in conjunction with a
detailed interpretation of aeromagnetic, gravity plus RAB / RC drill hole
logging originally led to the identification of at least sixteen higher
priority prospect areas. All these prospects were summarized in considerable
detail in Leyh (2008). Future work programs were then also proposed for each
area. Since then, further compilation work plus detailed geological
reconnaissance mapping and sampling of gossans and lode rocks has been carried
out.
A total of 22 prospects were then recognised on the exploration licence with
at least 12 occurring in and around the tenure.
With less than 15% outcropping Proterozoic terrain within the licence, this
makes it very difficult to explore and is in the main very effectively
screened from the easy application of more conventional exploration
methodologies due to a predominance of extensive Cainozoic cover sequences.
These include recent to young Quaternary soils, sands, clays and older more
resistant, only partially dissected, Tertiary duricrust regolith covered
areas. Depth of cover ranges from a few metres in the north to over 60
metres in some areas on the southern and central license.
Exploration by EGC Pty Ltd carried out in the field in the first instance has
therefore been heavily reliant upon time consuming systematic geological
reconnaissance mapping and relatable geochemical sampling. These involve a
slow systematic search over low outcropping areas, poorly exposed subcrops and
float areas as well as the progressive development of effective regolith
mapping and sampling tools. This work has been combined with a vast amount
of intermittently acquired past exploration data. The recent data
compilation includes an insufficiently detailed NSWGS regional mapping scale
given the problems involved, plus some regionally extensive, highly variable,
low-level stream and soil BLEG geochemical data sets over much of the area.
There are also a few useful local detailed mapping grids at the higher
priority prospects, and many more numerous widespread regional augers, RAB,
and percussion grid drilling data sets. Geophysical data sets including ground
magnetics, IP and EM over some prospect areas have also been integrated into
the exploration models. These are located mainly in former areas of moderate
interest and most of the electrical survey methods to date in this type of
terrain continue to be of limited application due to the high degree of
weathering and the often prevailing and complex regolith cover constraints.
Between 2007 and 2014 Eaglehawk Geological Consulting has carried out detailed
research, plus compilation and interpretation of a very large volume of
historic exploration data sourced from numerous previous explorers and dating
back to the early 1970's. Most of this data is in non-digital scanned form.
Many hard copy exploration reports (see references) plus several hundred plans
have been acquired from various sources, hard copy printed as well as
downloaded as scans from the Geological Survey of NSW DIGS system. They also
conducted field mapping, costean mapping and sampling, and rock chip sampling
and analysis.
Work Carried out by Squadron Resources and Whyloo Metals 2016-2020
Research during Year 1 by Squadron Resources revealed that the PGE-rich,
sulphide-bearing ultramafic rocks in the Broken Hill region have a
demonstrably alkaline affinity. This indicates a poor prospectivity for
economic accumulations of sulphide on an empirical basis (e.g., in comparison
to all known economic magmatic nickel sulphide deposits, which have a
dominantly tholeiitic affinity). Squadron instead directed efforts toward
detecting new Broken Hill-Type (BHT) deposits that are synchronous with basin
formation. Supporting this modified exploration rationale are the EL's
stratigraphic position, proximity to the Broken Hill line of lode, abundant
mapped alteration (e.g., gahnite and/or garnet bearing exhalative units) and
known occurrences such as the "Sisters" and "Iron Blow" prospects.
The area overlies a potential magmatic Ni-Cu-PGE source region of
metasomatised sub-continental lithospheric mantle (SCLM) identified from a
regional targeting geophysical data base. The exploration model at the time
proposed involved remobilization of Ni-Cu-PGE in SCLM and incorporation into
low degree mafic-ultramafic partial melts during a post-Paleoproterozoic plume
event and emplacement higher in the crust as chonoliths/small intrusives -
Voisey's Bay type model. Programs were devised to use geophysics and
geological mapping to locate secondary structures likely to control and
localise emplacement of Ni-Cu-PGE bearing chonoliths. Since EL8434 was
granted, the following has been completed:
• Airborne EM survey.
• Soil and chip sampling.
• Data compilation.
• Geological and logistical reconnaissance.
• Community consultations; and
• Execution of land access agreements.
Airborne EM Survey
Geotech Airborne Limited was engaged to conduct an airborne EM survey using
their proprietary VTEM system in 2017. A total of 648.92-line kilometres
were flown on a nominal 200m line spacing over a portion of the project area.
Several areas were infilled to 100m line spacing.
The VTEM data was interpreted by Southern Geoscience Consultants Pty Ltd, who
identified a series of anomalies, which were classified as high or low
priority based on anomaly strength (i.e., does the anomaly persist into the
latest channels). Additionally, a cluster of VTEM anomalies at the "Sisters"
prospect have been classified separate due to strong IP effects observed in
the data. Geotech Airborne have provided an IP corrected data and
interpretation of the data has since been undertaken.
Soil and Chip sampling
The VTEM anomalies were followed up by a reconnaissance soil sampling
programme. Spatially clustered VTEM anomalies were grouped, and follow-up soil
lines were designed. Two (2) VTEM anomalies were found to be related to
culture and consequently no soils were collected. Two (2) other anomalies
were sampled which were located above thick alluvium of Stephens Creek and
were therefore not sampled. A line of soil samples was collected over a
relatively undisturbed section at Iron Blow workings and the Sisters Prospect.
One hundred and sixty-six (166) soil samples were collected at a nominal 20cm
depth using a 2mm aluminium sieve. Two (2) rock chips were also collected
during this program. The samples were collected at either 20m or 40m spacing
over selected VTEM anomalies. The samples were pulverised and analysed by
portal XRF at ALS laboratories in Perth.
Each site was annotated with a "Regolith Regime" such that samples from a
depositional environment could be distinguished from those on exposed
Proterozoic bedrock, which were classified as an erosional environment. The
Regolith Regime groups were used for statistical analysis and levelling of the
results. The levelled data reveals strong relative anomalies in zinc at VTEM
anomaly clusters 10, 12 and 14 plus strong anomalous copper at VTEM 17.
Geology · Deposit type, geological setting, and style of mineralisation. Regional Geology
The Broken Hill polymetallic deposits are located within Curnamona Province
(Willyama Super group) (Figure A3-2-2) that hosts several world-class deposits
of lead, zinc, silver, and copper. The Willyama Supergroup consists of
highly deformed metasedimentary schists and gneisses with abundant
quartz-feldspathic gneisses, lesser basic gneisses, and minor 'lode' rocks
which are quartz-albite and calc-silicate rocks (Geoscience Australia,
2019). Prograde metamorphism ranges from andalusite through sillimanite to
granulite grade (Stevens, Barnes, Brown, Stroud, & Willis, 1988).
Regionally, the tenures are situated in Broken Hill spatial domain which
extends from far western New South Wales into eastern South Australia. The
Broken Hill Domain hosts several major fault systems and shear zones, which
were formed by various deformation events and widespread metamorphism which
has affected the Willyama Supergroup (Figure A1-2-3). Major faults in the
region include the Mundi Mundi Fault to the west of Broken Hill, the Mulculca
Fault to the east, and the Redan Fault to the south. Broken Hill is also
surrounded by extensive shear zones including the Stephens Creek,
Globe-Vauxhall, Rupee, Pine Creek, Albert, and Thackaringa-Pinnacles Shear
Zones.
Figure D2: Regional Stratigraphy (Available to view on PDF version of the
announcement)
Figure D3: Regional Geological Map (Available to view on PDF version of the
announcement)
There are over twenty (20) rock formations mapped within the project area.
Parts of the project area are covered by Quaternary alluvium, sands, and by
Tertiary laterite obscuring the basement geology. Within the Lower to Middle
Proterozoic Willyama Supergroup (previously Complex) there are two (2) groups,
the Thackaringa Group, and the younger Broken Hill Group (Colquhoun, et al.,
2019).
Local Geology
A summary of the units that host or appear to host the various mineralisation
styles within EL 8434 and EL 8435 is given below.
Broken Hill Group
The Hores Gneiss is mostly comprised of quartz-feldspar-biotite-garnet gneiss,
interpreted as metadacite with some minor metasediments noted. An age range
from Zircon dating has been reported as 1682-1695Ma (Geoscience Australia,
2019). The Allendale Metasediments unit contains mostly metasedimentary
rocks, dominated by albitic, pelitic to psammitic composite gneiss, including
garnet-bearing feldspathic composite gneiss, sporadic basic gneiss, and
quartz-gahnite rock. Calc-silicate bodies can be found at the base of the
unit and the formation's average age is 1691 Ma (Geoscience Australia, 2019).
Thackaringa Group
The Thorndale Composite Gneiss is distinguished by mostly gneiss, but also
migmatite, amphibolite, and minor magnetite. The age of this unit is
>1700Ma (Geoscience Australia, 2019) and is one of the oldest formations in
the Group. The Cues Formation is interpreted as a deformed sill-like
granite, including Potosi-type gneiss. Other rock-types include pelitic
paragneiss, containing cordierite. The average age: ca 1700-1730 Ma.
(Stevens, Barnes, Brown, Stroud, & Willis, 1988). Other rock types
include mainly psammo-pelitic to psammitic composite gneisses or
metasedimentary rocks, and intercalated bodies of basic gneiss. This unit is
characterised by stratiform horizons of granular garnet-quartz +/-magnetite
rocks, quartz-iron oxide/sulphide rocks and quartz-magnetite rocks (Geoscience
Australia, 2019). This is a significant formation as it hosts the Pinnacles
Ag-Pb-Zn massive sulphide deposit along with widespread Fe-rich stratiform
horizons.
The protolith was probably sandy marine shelf sedimentary rocks. An
intrusion under shallow cover was syn-depositional. The contained
leuco-gneisses and Potosi-type gneisses are believed to represent a felsic
volcanic or volcaniclastic protolith. Basic gneisses occur in a substantial
continuous interval in the middle sections of the Formation, underlain by
thinner, less continuous bodies. They are moderately Fe-rich (abundant
orthopyroxene or garnet) and finely layered, in places with pale feldspar-rich
layers, and are associated with medium-grained quartz-feldspar-biotite-garnet
gneiss or rock which occurs in thin bodies or pods ('Potosi-type' gneiss).
A distinctive leucocratic quartz-microcline-albite(-garnet) gneiss
(interpreted as meta-rhyolite) occurs as thin, continuous, and extensive
horizons, in several areas. The sulphide-bearing rocks may be lateral
equivalents of, or associates of Broken Hill type stratiform mineralisation.
Minor layered garnet-epidote-quartz calc-silicate rocks occur locally within
the middle to basal section. The unit is overlain by the Himalaya
Formation.
The Cues Formation is intruded by Alma Granite (Geoscience Australia, 2019).
The Himalaya Formation (Figure A3-2-4) consists of medium-grained saccharoidal
leucocratic psammitic and albitic meta-sedimentary rocks (average age
1700Ma). The unit comprises variably interbedded albite-quartz rich rocks,
composite gneiss, basic gneiss, horizons of thinly bedded quartz-magnetite
rock. Pyrite-rich rocks occur at the base of the formation (Geoscience
Australia, 2019). It is overlain by the Allendale Metasediments (Broken Hill
Group). The Himalaya Formation hosts cobalt-rich pyritic horizons at Pyrite
Hill and Big Hill. The protolith is probably sandy marine shelf sedimentary
rocks with variable evaporitic or hypersaline component. Plagioclase-quartz
rocks are well-bedded (beds 20 - 30mm thick), with rare scour-and-fill and
cross-bedded structures.
Thin to thick (0.5 - 10m) horizons of thinly bedded quartz-magnetite rock also
occur with the plagioclase-quartz rocks. In some areas the formation
consists of thin interbeds of plagioclase-quartz rocks within meta-sedimentary
rocks or metasedimentary composite gneiss (Geoscience Australia, 2019). Lady
Brassey Formation which is well-to-poorly-bedded leucocratic sodic
plagioclase-quartz rock, as massive units or as thick to thin interbeds within
psammitic to pelitic metasedimentary composite gneisses. A substantial
conformable basic gneiss. It overlies both Mulculca Formation and Thorndale
Composite Gneiss. Part of the formation was formerly referred to as Farmcote
Gneiss in the Redan geophysical zone of Broken Hill Domain - a zone in which
the stratigraphy has been revised to create the new Rantyga Group (Redan and
Ednas Gneisses, Mulculca Formation, and the now formalised Farmcote Gneiss).
Lady Louise Suite
This unit is approximately 1.69Ma in age comprising amphibolite,
quartz-bearing, locally differentiated to hornblende granite, intrusive sills,
and dykes, metamorphosed, and deformed; metabasalt with pillows (Geoscience
Australia, 2019). Annadale Metadolerite is basic gneisses, which includes
intervening metasedimentary rocks possibly dolerite (Geoscience Australia,
2021).
Rantya Group
Farmcote Gneiss contains metasedimentary rocks and gneiss and is a new unit at
the top of Rantyga Group. It is overlain by the Cues Formation and
Thackaringa Group, and it overlies the Mulculca Formation. The age of the
unit is between 1602 to 1710Ma. Mulculca Formation is abundant
metasedimentary composite gneiss, variable sodic plagioclase-quartz-magnetite
rock, quartz-albite-magnetite gneiss, minor quartz-magnetite rock common,
minor basic gneiss, albite-hornblende-quartz rock (Geoscience Australia,
2019). Ednas Gneiss contains quartz-albite-magnetite gneiss, sodic
plagioclase-quartz-magnetite rock, minor albite-hornblende-quartz rock, minor
quartzo-feldspathic composite gneiss. It is overlain by Mulculca Formation.
Silver City Suite
Formerly mapped in the Thackaringa Group this new grouping accommodates the
metamorphosed and deformed granites. A metagranite containing
quartz-feldspar-biotite gneiss with variable garnet, sillimanite, and
muscovite, even-grained to megacrystic, elongate parallel to enclosing
stratigraphy. It occurs as sills and intrudes both the Thackeringa Group and
the Broken Hill Group. This unit is aged between 1680 to 1707Ma.
Torrowangee Group
Mulcatcha Formation comprises flaggy, quartzose sandstone with lenticular
boulder and arkosic sandstone beds. Yangalla Formation contains boulder
beds, lenticular interbedded siltstone, and sandstone. It overlies the
Mulcatcha Formation (Geoscience Australia, 2020).
Sundown Group
The Sundown Group contains Interbedded pelite, psammopelitic and psammitic
metasedimentary rocks and it overlies the Broken Hill Group. The unit age is
from 1665 to 1692Ma (Figure A1-2-4).
There is also an unnamed amphibolite in Willyama Supergroup, which present
typically medium grained plagioclase and amphibole or pyroxene rich stratiform
or discordant dykes.
Figure D4: EL 8434 and EL 8435 Solid Geology (Available to view on PDF
version of the announcement)
Drill hole Information · A summary of all information material to the understanding of the · No new drillholes have been completed yet.
exploration results including a tabulation of the following information for
all Material drill holes:
o easting and northing of the drill hole collar
o elevation or RL (Reduced Level - elevation above sea level in metres) of
the drill hole collar
o dip and azimuth of the hole
o down hole length and interception depth
o hole length.
· If the exclusion of this information is justified on the basis
that the information is not Material and this exclusion does not detract from
the understanding of the report, the Competent Person should clearly explain
why this is the case.
Data aggregation methods · In reporting Exploration Results, weighting averaging techniques, · No new laboratory assays are reported in this announcement;
maximum and/or minimum grade truncations (e.g., cutting of high grades) and however, a visit is in progress to the GSNSW core library to relog and
cut-off grades are usually Material and should be stated. resample six (6) drillholes completed across EL 8434 and 8435. Portable XRF
readings are being used to identify sections of core to be resampled.
· Where aggregate intercepts incorporate short lengths of
high-grade results and longer lengths of low-grade results, the procedure used
for such aggregation should be stated and some typical examples of such
aggregations should be shown in detail.
· The assumptions used for any reporting of metal equivalent values
should be clearly stated.
Relationship between mineralisation widths and intercept lengths · These relationships are particularly important in the reporting · As a database of all the historical borehole sampling has not yet
of Exploration Results. been compiled and validated (in progress) it is uncertain if there is a
relationship between the surface sample anomalies to any subsurface anomalous
· If the geometry of the mineralisation with respect to the drill intersections. Mineralisation is commonly associated with shears, faults,
hole angle is known, its nature should be reported. amphibolites, and pegmatitic intrusions within the shears, or on or adjacent
to the boundaries of the Himalaya Formation.
· If it is not known and only the down hole lengths are reported,
there should be a clear statement to this effect (e.g. 'down hole length, true · No existing geological 3D models exist but preliminary
width not known'). investigation has shown that sufficient data may be available to generate a
small resource of cobalt or copper.
Diagrams · Appropriate maps and sections (with scales) and tabulations of · Current surface anomalies are shown on maps in the report. All
intercepts should be included for any significant discovery being reported historical surface sampling has had their coordinates converted to MGA94, Zone
These should include, but not be limited to a plan view of drill hole collar 54.
locations and appropriate sectional views.
Balanced reporting · Where comprehensive reporting of all Exploration Results is not · All portable XRF readings have been included. Regarding the
practicable, representative reporting of both low and high grades and/or surface sampling, no results other than duplicates, blanks or reference
widths should be practiced to avoid misleading reporting of Exploration standard assays have been omitted.
Results.
Other substantive exploration data · Other exploration data, if meaningful and material, should be · Historical explorers have also conducted airborne and ground
reported including (but not limited to): geological observations; geophysical gravity, magnetic, EM, and IP resistivity surveys over parts of the tenure
survey results; geochemical survey results; bulk samples - size and method of area but this is yet to be fully georeferenced (ground IP surveys).
treatment; metallurgical test results; bulk density, groundwater, geotechnical
and rock characteristics; potential deleterious or contaminating substances.
Further work · The nature and scale of planned further work (e.g., tests for Work has commenced on Stage 2, which is to identify more cobalt anomalies and
lateral extensions or depth extensions or large-scale step-out drilling). priority zones within the EL 8434 and EL8435, it is recommended that:
· Diagrams clearly highlighting the areas of possible extensions, · The non-sampled zone in the centre of the tenure be defined and
including the main geological interpretations and future drilling areas, sampled.
provided this information is not commercially sensitive.
· A more detailed study of historical drillholes should be
conducted to determine if enough data exists to estimate a JORC resource; and
· A program of field mapping and ground magnetic or EM surveys be
planned and executed.
APPENDIX E: BHA Modelling Updates
Objectives and Scope
As part of an ongoing database and modelling effort of cobalt at Reefs Tank
and Tors Tank a program of relogging and resampling was instigated across the
tenure suite EL8434 and 8435. The objective was to examine the rock types,
local structure and mineralisation styles which are very similar in many
instances to the cobalt horizons at Reefs Tank and Tors Tank.
Drillholes held within the GSNSW Broken Hill Core Storage Facility were
identified as being held within as listed in Table E1, below. The holes
covered existing prospects: The Sisters, Iron Blow, Round Hill, and Rockwell,
all which were wholly within or partly trending into the BHA tenure package.
TABLE E1: EL 8434, 8435 DRILLHOLES FOR RE-LOGGING AND RESAMPLING
HOLE_NAME E_GDA94 N_GDA94 LOG_FROM_m LOG_TO_m Notes Notes
BH1 566841.77 6480228.70 20.00 23.00 Cobalt as high as 950ppm in several bands, in chloritic schist BH1&2 from The Sisters Cu-Au-Co historic mine; depths will be in feet.
113.00 127.00
BH2 566721.77 6480418.70 77.00 116.00 Cobalt as high as 250ppm in several bands, in chloritic schist
136.00 141.00
DD80RW4 559571.82 6459448.72 74.00 112.00 No anomalous Cu, Pb, Zn, Ag zones; Co not analysed DD80RW series at Rockwell BHT prospect
124.00 130.00
DD80RW4_1 559571.82 6459448.72 74.00 112.00 No anomalous Cu, Pb, Zn, Ag zones; Co not analysed Redrill at the same site
124.00 130.00
198.00 232.00
270.00 275.00
350.00 375.00
DD90_IB3 560223.79 6473890.70 140.00 250.00 No assay found?? DD90_IB3 at the Iron Blow BHT and PGE prospect
RH3 562961.79 6474868.70 6.00 52.60 No assay for cobalt (only PGE); look for chloritic schist or blue quartz, Drillholes This is the western-most drillhole in the Round Hill PGE Prospect
Mn-rich horizons
Source: CCZ geology team
Current Investigations
This release concerns the first two drillholes BH1 and BH2 from The Sisters
prospect, as examination of the other holes at other prospects is in progress.
Core from each of these holes was sequentially laid on core tables and
attempted to be reconciled with historically logged drill depths (drilling
completed between 1969 and 1970), a task complicated by missing core,
incorrectly named core boxes and the use of imperial measurements and limited
use of core blocks.
In BH1 thirty-one (31) intervals and in BH2 fifty-six (56) approximately 1m
intervals for portable XRF and magnetic susceptibility and future lab analysis
identified and marked with core blocks (blue). Intervals located across three
zones of interest. Two, sixty second XRF readings and three Mag Sus reading
taken per interval.
Previously sampled intervals were identified. Core blocks were inserted
within core trays to identify sample intervals for further cutting and
analysis. Wet and dry photographs of core from both holes was undertaken.
XRF data preliminary results and a comparison to historical sampling are given
above. In general, BH1 showed significant cobalt and zinc mineralisation, and
to a lesser degree copper mineralisation.
FIGURE E1: LOCATION OF HISTORICAL DRILLING AT THE SISTERS (Available to view
on PDF version of the announcement)
FIGURE E2: SETTING UP FOR CORE PHOTOGRAPHY (Available to view on PDF version
of the announcement)
Figure E3: Typical High Grade Metamorphic rocks in BH2 (Available to view on
PDF version of the announcement)
Best intersections from the two holes are as shown in Table E2 and in Figures
E4 and E5, below.
TABLE E2: SIGNIFICANT PRXF ASSAY READINGS FOR INTERVALS BH1 AND BH2
Drillhole From To App. Thick. (m) Co (ppm) Cu (%) Zn (%)
BH1 11.84 20.89 9.05 859 0.15 0.26
106.62 114.36 7.26 946 0.48 1.53
116.24 124.66 8.42 897 0.05 3.26
124.66 129.54 4.88 370 0.52 0.89
BH2 89.35 90.44 1.09 245 0.02 1.89
92.66 93.57 0.91 350 0.04 1.94
137.29 140.58 3.29 525 0.05 2.21
Source: CCZ geology team
FIGURE E4: BH1 AND BH2 PXRF COBALT VALUES (PPM; COLOURS AS PER FIGURE E5)
(Available to view on PDF version of the announcement)
FIGURE E5: BH1 AND BH2 PXRF COBALT HISTOGRAM (Available to view on PDF version
of the announcement)
Given the unexpected thick intervals of anomalous cobalt by portable XRF,
historical laboratory assay data was downloaded and encoded, with Table E3 and
Figures E6 and E7 illustrating significant intersections.
TABLE E3: SIGNIFICANT LABORATORY ASSAY READINGS FOR ALL "THE SISTERS"
DRILLHOLES
Drillhole From To App. Thick. (m) Ag (g/t) Co (ppm) Cu (%) Zn (%)
BH1 20.57 22.25 1.68 1.4 185 0.02 0.002
BH1 123.14 126.49 3.35 1.1 430 1.0 n/a
BH2 138.38 139.90 1.52 0.7 320 0.02 0.004
BH3 68.28 73.76 5.48 0.2 301 0.01 0.002
BH4 35.66 36.58 0.92 1.0 160 0.004 n/a
RCPS3 16.0 20.0 4.0 0.5 138 0.02 0.002
RCPS4 12.0 15.0 3.0 0.5 119 0.04 0.007
Source: CCZ geology team
FIGURE E6: THE SISTERS HISTORICAL DRILLHOLES, COBALT PPM BY LABORATORY ASSAY
(Available to view on PDF version of the announcement)
FIGURE E7: HISTOGRAM OF HISTORICAL LABORATORY ASSAY (Available to view on PDF
version of the announcement)
Location and background
"The Sisters" prospect is located 13km northeast from Broken Hill, NSW (Figure
A1-8). Access by road is via Mt. Gipps turning off the Barrier Highway at K
Tank Station, 9km east from Broken Hill, thence 4km north via a station track.
"The Sisters" lie 500m west across country from this point.
Within EL8435, The Sisters Prospect comprises a prominent ridge forming
exposures of banded iron formation in a tight synform, hosted in schists.
The formation outcrops over one kilometre and consists of individual lensoidal
bands of quartz and magnetite up to tens of metres thick and up to 100 metres
long. Below the base of oxidation pyrite occurs as weak disseminations and
narrow massive laminae. Magnetite is concentrated in the base of the synform
(Timms and Groves 2003).
The synform is flatly north plunging and strongly contorted and crumpled.
Secondary copper mineralisation occasional with weak gold and silver occurs at
surface along a major north-south striking structure associated with shearing
and quartz veining. The structure appears axial planar. The more
significant mineralisation appears to be developed where the structure
intersects lenses of the banded iron formation in the hinge zone.
FIGURE E8: EL 8434 & 8435 LOCATION PLAN - THE SISTERS PROSPECT
(Available to view on PDF version of the announcement)
Regional geology
The Sisters prospect occurs in a bedded quartz magnetite horizon, folded into
a north pitching synclinal structure. The synclinal structure is large and
is clear on airborne magnetic imagery. The trough of the quartz-magnetite
(QM) bed probably extends several thousand metres downwards vertically
(Gilfillan 1971).
These rocks form part of the Willyama Super Group of lower to middle
Paleoproterozoic Age (1690 - 1730 Ma; Willis et al 1983). Stratigraphically
they have been mapped as being higher in sequence than the Broken Hill
mineralisation. The unit hosts cobalt-rich pyritic horizons at Pyrite Hill
and Big Hill. The protolith probably sandy marine shelf sedimentary rocks
with variable evaporitic or hypersaline component. The unit occurs in
Thackaringa Group and overlies the Cues Formation.
Mineralisation at The Sisters consists of scattered copper carbonates and
silicates in bands in the QM bed and appears confined to this horizon. Two
shallow shafts have been sunk in the schists adjacent to the hanging wall of
the QM. The more northerly shaft appears to be about 20m deep and copper
carbonates were evident in the mullock from this shaft (Timms and Groves
2003).
FIGURE E9: BHA TENURES - REGIONAL GEOLOGY AND MINERALISATION STYLES
(Available to view on PDF version of the announcement)
Mineralisation
The mineralisation is indicated by surface exposures of ferruginous gossan
showing box works and siliceous lenses with some box works, any by numerous
surface historical workings. Some disseminated mineralisation with
associated copper carbonates occurs in parts of the QM rock.
The controls of mineralisation appear to be:
(1) Favourable structure. Near the heel of the syncline where pressure lows
favouring mineralisation are frequently developed.
(2) Favourable Bedding. The QM rock here has acted as a favourable bed, with
some replacement of QM by mineralisation and probable infilling of fractures
within the QM by mineralisation. The mineralisation does appear to favour
the hanging wall of the bed.
(3) Fault Control. The mineralisation appears to be associated with faulting
(Strike 150(o), dip 75(o) W) which cuts obliquely across the QM layer. Widths
of mineralisation vary considerably on either side of such faults.
Surface sampling
Grab samples by various explorers (Gilfillan 1971; Leyh 1976; 1990; Timms and
Groves 2003) were taken over the surface of the QM formation. The highest
value obtained was 0.4% copper with values between 1500 ppm and 4000 ppm
copper for 4 samples, each of which showed some visible copper carbonates. A
sample of gossan with box works assayed 900 ppm.
The siliceous formation with box works and iron oxide gave miscellaneous
values with 10 samples assaying between 70 and 160 ppm Cu. No significance
is attached to the values obtained, other than that they establish the minimum
dimensions of the length of original mineralisation.
Potential
The main occurrences of gossan and siliceous rock with box works occur over a
length of approximately 400m on the western limb of the main synclinal
structure. Additional mineralisation occurs over a further 100 metres in a
minor fold structure.
Other minor obvious occurrences of mineralisation occur which give scope for
prospecting for additional shoots of mineralisation around the structure. It
is likely that the mineralisation will persist at depth though pitching to the
north and it is recommended that the downward extension of the mineralisation
be drilled below the water table.
The structure is a large one (at the surface >1,200m in length) and the
possibility exists of a large tonnage of ore being established, particularly
on the keel of the synclinal structure (Gilfillan 1971).
References
Castillo Copper Limited, 2022a, ASX Release Battery metal drill-hole assays
unlock BHA East Zone potential / lithium update, 5(th) January 2022.
Castillo Copper Limited, 2022b, Strategic focus to develop significant cobalt
mineralisation potential at BHA Project, 9(th) February 2022.
Castillo Copper Limited, 2022c, High grade platinum confirmed at BHA Project,
9(th) March 2022.
Biggs, M.S., 2022a, BHA Cobalt Modelling and Mineral Resource Estimate Update,
unpublished memo for Castillo Copper by ROM Resources.
Biggs, M.S., 2022b, Broken Hill BHA Tenures Update, Castillo Copper,
unpublished memo prepared by ROM Resources, Mar 22, 5pp
Gilfillan J.F., 1971, Report on Exploration by Falconbridge (Australia) Pty
Ltd on ATP 3091 Broken Hill Area NSW under option from Minerals Recovery
(Australia) N.L., Falconbridge (Australia) Pty Limited, Jan 1971, 93pp
Leyh, W.R., 1976, Progress Report on Exploration Licence, No. 846 Iron Blow
-Yellowstone Area, Broken Hill, New South Wales for the six months period
ended 29(th) July 1976, North Broken Hill Limited, Report GS1976-198, Jul 76,
88pp
Leyh, W.R., and Lees T., 1977, Progress Report on Exploration Licence, No. 846
Iron Blow -Yellowstone Area, Broken Hill, New South Wales for the six months
period ended 29(th) June 1977, North Broken Hill Limited, Report GS1976-198,
Jul 77, 35pp
Leyh, W.R., 1990, Exploration Report for the Third Six Monthly Period ended
12(th) June 1990 for EL 3238 (K Tank), Broken Hill District, New South Wales
for the six months period, Pasminco Limited, Report GS1989-226, Jun 90, 22pp
Mohoney, M., 2018, BHA Broken Hill Project Position Paper, Squadron Resources
Pty Ltd., Unpublished report, Mar2018, 8pp
Main, J.V., and Tucker D.F., 1981, Exploration Report for Six Month Period
8(th) November 1980 to 7(th) May 1981, EL 1106 Rockwell, Broken Hill, NSW, CRA
Exploration Pty Ltd, GS1980-080, Jul 1981, 40pp
Squadron Resources Pty Ltd, 2018, Broken Hill Project Status, August 2018,
unpublished confidential presentation by Squadron Resources,
Timms, P.D., and Groves A.J., 2003, Exploration Licence 4846, The Sisters,
Annual Report to 29th May 2003, Endeavour Minerals Pty Ltd.,
Willis, I.L., Brown, R.E., Stroud, W.J., Stevens, B.P.J., 1983, The Early
Proterozoic Willyama Supergroup: stratigraphic subdivision and interpretation
of high to low-grade metamorphic rocks in the Broken Hill Block, New South
Wales., Geological Society of Australia Journal, 30(2), p195-224
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