REG - Castillo Copper Ltd - NWQ Copper Project’s development targets
23/01/2023 07:00
For best results when printing this announcement, please click on link below:
http://newsfile.refinitiv.com/getnewsfile/v1/story?guid=urn:newsml:reuters.com:20230123:nRSW4719Na&default-theme=true
RNS Number : 4719N Castillo Copper Limited 23 January 2023
23 January 2023
CASTILLO COPPER LIMITED
("Castillo", or the "Company")
NWQ Copper Project's development targets
Castillo Copper Limited (LSE and ASX: CCZ), a base metal explorer primarily
focused on copper across Australia and Zambia, announces that following a
review of prospects within the NWQ Copper Project (Appendix A), has authorised
the geology team to visit several prospects - including Big One, Arya and
Valparaisa - during 1H 2023 to identify new targets for test-drilling.
HIGHLIGHTS:
· Initial focus will be on the Big One, which has an inferred Mineral
Resource Estimate (MRE) of 2.1Mt @ 1.1% Cu for 21,886kt(1) copper metal
post-two drilling campaigns across 2020-21:
o Factoring in a large conductor north of the line of lode, plus reconciling
available geophysics and geochemical data, Castillo's geological consultant
has set an Exploration Target that ranges from 2-6Mt @ 0.6-1% Cu for 12-60kt
copper metal*
· The Valparaisa Prospect comprises copper mineralisation across two
horizons over a 6km strike event, with the interaction of two intersecting
faults suggesting a structurally controlled copper system that can potentially
be drill-tested(2)
· At the Arya Prospect, there is a significant magnetic anomaly, south
of a known graphite system(3) (test drilled in late 2021), that shows
potential to be a primary source of copper mineralisation
· Meanwhile, final drill and auger assays, which are still pending,
should define the potential scale of the rare earth element discovery at the
BHA Project's East Zone
Dr Dennis Jensen, Managing Director of Castillo Copper, said: "With the
macro-outlook for copper remaining upbeat, the Board has authorised the
geology team to visit several prospects to identify new targets to test-drill.
Key areas of focus include increasing the grade and confidence in the current
MRE at Big One and the magnetic anomaly at the Arya Prospect. Given the large
size of the NWQ Copper Project, the Board remains open to aligning with a
strategic partner to further advance development work."
* Cautionary Statement: It should be noted that the Exploration Target tonnage
range quoted above are conceptual in nature and there has been insufficient
exploration to define a copper resource. Although a preliminary analysis was
undertaken, insufficient data exists to confidently correlate mineralised
horizons within the Exploration Target area. It is uncertain whether further
exploration may lead to the reporting of a JORC-standard resource, however,
there is some evidence to support the current exploration tonnage
calculations, and the sufficient mineralised thicknesses interpreted from
historical drilling to warrant further investigation in some areas.
NWQ Copper Project - Site Visit
A summary of salient points from the review for the three prospects
highlighted follows:
Big One
Whilst some areas around Big One were drill-tested in the 2020-21 drilling
campaigns, much of the area remains under-explored which highlights the
exploration potential.
Utilising information from Castillo's drilling campaigns, complemented with
historical data, Castillo's geological consultant compiled an extensive
database, built a block model, and produced a maiden 2012 JORC Inferred MRE at
2.1Mt @ 1.1% Cu for 21,886kt copper metal(1) (Figure 1).
FIGURE 1: MINERAL RESOURCE TONNAGES BIG ONE COPPER MINE
Tenure Name Ore Type Depth (m) Specific Gravity (kg/m(3)) Inferred (Mt) Indicated (Mt) Copper Grade % Silver Grade Contained Copper (t) Contained
g/t Silver (kg)
Mine Dumps Oxidised At surface/ROM 2.55 0 0.007 1.2 4.0 86 29.6
Mine Insitu Oxidised 2-70 2.65 1.7 0 1.0 1.1 17,000 1,870
Mine Insitu Fresh 70-120 2.75 0.4 0 1.2 1.4 4,800 560
Sub-Totals 2.1 0.007 21,886 2,459.6
Note: No measured resources estimated
Source: CCZ geology team
Building on this work, the geology team believe further drilling is warranted
along the known orebody to the east, north and downdip as it is not fully
defined. Specifically, the geology team believe a well-designed drilling
campaign - focussing on diamond coring - has the potential to materially
increase the grade and confidence in the current MRE, as the orebody is open
to the east and downdip.
In addition, an Exploration Target* (to the standard of Clause 17 of the 2012
JORC Code) has been estimated utilising the following information:
· the MRE plus some areas proximal to and downdip to the main resource
shell; and
· available geophysics and surface sampling data.
The Exploration Target's* mid-range is 4Mt @ 0.6-1.0% Cu, with the low at 2Mt
and high at 6Mt - refer to Figures 2 and 3. It should be explained that this
is an enlarged range of tonnage compared to the MRE due a new wireframe model
extended along the entire line of lode.
* Cautionary Statement: It should be noted that the Exploration Target tonnage
range quoted above are conceptual in nature and there has been insufficient
exploration to define a copper resource. Although a preliminary analysis was
undertaken, insufficient data exists to confidently correlate mineralised
horizons within the Exploration Target area. It is uncertain whether further
exploration may lead to the reporting of a JORC-standard resource however
there is some evidence to support the current exploration tonnage
calculations, and the sufficient mineralised thicknesses interpreted from
historical drilling to warrant further investigation in some areas.
FIGURE 2: BIG ONE - EXPLORATION TARGET *
Target Strike Length (m) Strike Length (m) Width (m) Width (m) Depth below surface (m) Depth below surface (m) Density (t/m(3)) Density (t/m(3))
Ranges Low High Low High Low High Low High
Big One 600 1,550 4 14 10 190 2.65 2.80
Note: Mid-points as follows - Strike length (1,550m); Width (9m); Depth below
surface (100m); Density (2.725t/m3)
Source: CCZ geology team
FIGURE 3: BIG ONE - EXPLORATION TARGET FOR COPPER *
Target Tonnage (Mt) Tonnage (Mt) Grade (%) Grade (%) Contained Cu (t) Contained Cu (t)
Ranges Low High Low High Low High
Big One 2.0 6.0 0.6 1.0 12,000 60,000
Note:
1. Mid-points as follows - Tonnage (4Mt); Grade (0.8%);
Contained copper (32,000t)
2. Volume and mass are exclusive of the Big One Copper Mine's
Inferred resource shell.
3. Where quoted, it should be noted that where Exploration
Target tonnages are estimated in this ASX Release, they are considered
non-JORC (Clause 17 Exploration Results) and are conceptual in nature. There
has been insufficient exploration to define a Mineral Resource and that it is
uncertain if further exploration will result in the determination of a Mineral
Resource.
4. At 0.5% Cu cut-off.
Source: CCZ geology team
* Cautionary Statement: It should be noted that the Exploration Target tonnage
range quoted above are conceptual in nature and there has been insufficient
exploration to define a copper resource. Although a preliminary analysis was
undertaken, insufficient data exists to confidently correlate mineralised
horizons within the Exploration Target area. It is uncertain whether further
exploration may lead to the reporting of a JORC-standard resource however
there is some evidence to support the current exploration tonnage
calculations, and the sufficient mineralised thicknesses interpreted from
historical drilling to warrant further investigation in some areas.
Valparaisa Prospect
The Valparaisa Prospect comprises copper mineralisation in two horizons -
termed the "upper and lower copper beds" - within the Middle Gunpowder Creek
Formation over a 6km strike length (Figure 4). Compared with the 'upper bed'
the 'lower bed' has the stronger outcrop and more copper staining(2).
Previous explorers, including BHP, undertook rock-chip sampling which returned
high-grade assay results up to 2,530ppm Cu, demonstrating prospectivity at
surface for copper mineralisation(2). Interestingly, the surface anomalism
aligns with the interaction of two intersecting faults - Mt Gordon (SW-NE -
links to Mt Mammoth Deposit) and Valparaisa (SSE-NNW).
Reconciling and interpreting the foregoing facts has postulated that there is
a structurally controlled copper system at the Valparaisa Prospect.
FIGURE 4: VALPARAISA PROSPECT - SOLID GEOLOGY, ROCK CHIPS & DRILLHOLES
Source: CCZ geology team
In terms of identifying potential targets for closer scrutiny, a key positive
was identifying the Whitworth Quartzite rock formation within the Valparaisa
fault. This is significant as it hosts copper sulphide mineralisation within
the Mt Gordon fault at the Mt Mammoth Deposit. Reconciling this against
overlaid magnetic imagery, enables several target areas for structurally
controlled copper and supergene ore mineralisation to be generated (Figure
5).
FIGURE 5: STRUCTURALLY CONTROLLED AND SUPERGENE TARGETS
Source: CCZ geology team
Arya Prospect
A limited drilling campaign in late 2021, designed to test several large
airborne electro-magnetic and ground resistivity anomalies, confirmed a
low-grade graphite system that won't be further explored (refer Appendix B for
assay results).
However, a sizeable magnetic anomaly - south of the known electro-magnetic
anomalies - is interpreted to be associated with known surface copper and to a
lesser degree silver mineralisation. A key focus of the site visit is to
determine if this should be drill-tested as it may be a primary source of base
metal mineralisation at the Arya Prospect.
In terms of regional geology, the Arya Prospect is located in the Western Mt
Isa Succession, within a structurally deformed and copper anomalous district
that hosts the Capricorn Copper Mine, Mt Oxide Mine and the Ladie Annie Mine.
These are hosted within units of the upper Myally sub-group to lower McNamara
Group, while the Arya Prospect is hosted within the Surprise Creek formation
(Figure 6).
FIGURE 6: STRATIGRAPHIC COLUMN
Source: Smith (2019) - reference 4
In terms of local geology, the Arya Prospect is located within the Surprise
Creek Formation unit (Prd), with several results from rock-chip sampling
indicative of a structural system for anomalous copper values (Figure 7).
Moreover, the Arya Prospect is proximal to an east to north-east trending
fault that offsets the Surprise Creek unit (Prd) from lower units near the
base of the Surprise Creek Formation, and Myally Sub-Group units, including
quartzites, and sandstones.
FIGURE 7: COPPER GEOCHEMISTRY ON QUEENSLAND GOVT GEOLOGICAL MAP
Source: Smith (2019) - reference 4
Interpreting these findings, suggests probable mineralisation styles include:
· Supergene mineralisation forming at the surface along the fault,
fault breccia, and the Surprise Creek Formation (PLrd) rock unit.
· Epigenetic replacement mineralisation for Cu (with minor components
of other base metals and gold) from replacement carbonate mineralisation,
particularly the Surprise Creek Formation.
· Skarn mineralisation for Cu-Au and/or Zn-Pb-Cu from replacement
carbonate mineralisation, particularly the Surprised Creek Formation.
· Sulphide mineralisation within breccia zones, along stress dilation
fractures, emplaced within pore spaces, voids, or in other rock fractures;
and/or dykes.
Main ore minerals observed comprise:
· Malachite and chrysocolla along foliation, in brecciated/strongly
haematitic sedimentary rocks.
· Quartzite/rhyolite with chrysocolla on joint surfaces and fractures,
circa 3-5% Cu.
· Malachite and azurite on joint planes in porous sandstone.
For further information, please contact:
Castillo Copper Limited +61 8 6558 0886
Dr Dennis Jensen (Australia), Managing Director
Gerrard Hall (UK), Chairman
SI Capital Limited (Financial Adviser and Corporate Broker) +44 (0)1483 413500
Nick Emerson
Gracechurch Group (Financial PR) +44 (0)20 4582 3500
Harry Chathli, Alexis Gore, Henry Gamble
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 and platinoids.
· 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."
Competent Person's Statement
The information in this report that relates to Exploration Results and Mineral
Resource Estimates 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.
References
1) CCZ ASX Release - 28 February 2022
2) CCZ ASX Release - 7 September 2020
3) CCZ ASX Release - 10 August 2021 & 17 November 2021; 28
January 2022
4) Smith P., 2019, Ayra Mt Oxide prospect, unpublished report by
Yoda Consulting Pty Ltd to Castillo Copper Limited, Apr 2019, 15pp.
APPENDIX A: NWQ COPPER PROJECT
FIGURE A1: PROSPECTS WITHIN NWQ COPPER PROSPECT
Source: CCZ geology team
APPENDIX B: ARYA PROSPECT - METALLURGICAL TESTS
Background petrographic description
One composite sample from drill-hole AR_002RC, sized into 7 fractions, was
submitted for optical investigation, with the main aim of characterising the
presence and mode of occurrence of graphite (Schulz and others 2022; refer to
Appendix C for reference list).
Polished blocks were prepared for all size fractions, and these were examined
using a petrographic microscope (reflected light). Further, representative
splits of the +800 µm and +500 µm fractions were examined using a stereo
microscope.
Reflected light images of selected fields of the polished blocks (all size
fractions) and stereo-microscope images of the unmounted +800 µm and +500 µm
fractions were included in the metallurgical report (refer Appendix C: Schulz
and others 2022). Figure AB-1 illustrates the nature of mica and sulphide
inclusions in the sized schist chips.
FIGURE AB-1: PHOTOMICROGRAPH - SCHIST PARTICLES W/MICA & SULPHIDE
INCLUSIONS
Source: ALS Perth
The presence of graphite was confirmed by the optical investigation. With the
chosen settings, graphite particles are identified as creamy white, elongated
particles under reflected light. The graphite flakes range in size from a few
µm (not positively identifiable by the optical investigation) to about 50 µm
in length.
They occur as fine-grained flakes within larger, silicate-rich particles (see
Figure AB-2 for an example of the graphite grains).
FIGURE AB-2: GRAPHITE AND SULPHIDE INCLUSIONS WITHIN SCHIST FRAGMENTS
Source: ALS Perth
Graphite sizing and optical analysis
The composite sample supplied to ALS Perth's laboratory was made up as
follows:
· AR_002RC: 17m - samples CCZ03231 (73m) to CCZ03247 (90m) from the
coarsest fraction saved. This graphite prospect is low grade, but there are
large thicknesses (e.g., 56m @ 1.35% TGC and 0.25 g/t Ag in one hole). The
field association of the Ag and its relationship to graphite has yet to be
resolved. The sulphur and vanadium reporting from assays over the graphite
horizons are low.
· The sizing of the supplied RC chips and subsequent testing and optical
analysis is given by Figure AB-3 below. No further sizing was conducted on the
graphite component.
FIGURE AB-3: AR_002RC SIZING AND OPTICAL ANALYSIS
Note:
1. This sizing distribution is for the whole RC chip composite,
not the graphite component.
2. No graphite grains above 50µm in length were detected.
Source: ALS Perth
APPENDIX C: JORC CODE, 2012 EDITION - TABLE 1 AYRA DRILLING AND SURFACE ROCK CHIP SAMPLING
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, Drilling
or specific specialised industry standard measurement tools appropriate to the
minerals under investigation, such as down hole gamma sondes, or handheld XRF · Reverse Circulation samples were taken off a cyclone for every
instruments, etc). These examples should not be taken as limiting the broad metre drilled, put through a three tier, 87.5/12.5 splitter where
meaning of sampling. approximately 2.5 kg of RC chip samples were collected for every metre
drilled. The remainder was bagged separately and stored in case additional
· Include reference to measures taken to ensure sample sub sampling is required before the end of the program.
representivity and the appropriate calibration of any measurement tools or
systems used. · Samples were also composited every four metres where visual
inspection did not initially indicate copper or cobalt mineralisation. All
· Aspects of the determination of mineralisation that are Material samples were collected to maximise optimal representation for each sample.
to the Public Report.
· Each metre sample had an amount removed for washing and cleaning
· In cases where 'industry standard' work has been done this would and sieving then place into metre allocated chip trays. These chips were
be relatively simple (e.g., 'reverse circulation drilling was used to obtain 1 logged on site by the rig geologists and those logs have been saved into a
m samples from which 3 kg was pulverised to produce a 30 g charge for fire spreadsheet and stored on the Company server. Any visible mineralisation,
assay'). In other cases, more explanation may be required, such as where there alteration or other salient features were recorded in the logs. Industry-wide,
is coarse gold that has inherent sampling problems. Unusual commodities or acceptable, standard practices were adhered to for the drilling and sampling
mineralisation types (e.g., submarine nodules) may warrant disclosure of of each metre as per the drilling and sampling Procedures set out before
detailed information. commencement of the drilling programme.
Rock Chip Sampling
· CCZ completed rock chip sampling methods over at least four (4)
separate surface sampling campaigns and are described in the October and
November 2021 ASX Releases, a generalised description of rock chip sample
collection is presented here.
· Rock Chip Samples - were collected up to approximately a 5m
radius around the recorded co-ordinate location. The rock chip fragments that
were collected to make up the sample included a typical fragment size that
approximately ranged from 2-5cm.
· Sub-sampling occurred as described in the section 'Sub-sampling
techniques and sample preparation' in Section 1 of the current Table 1.
· The surface sample results described in this ASX Release are
suitable for the reporting 'exploration results' for mineral prospectivity,
additional exploration work would have to be completed to geologically model
and then estimate a mineral resource.
Drilling techniques · Drill type (eg core, reverse circulation, open-hole hammer, · Arya. Reverse Circulation, RC, and Rotary Air blast (RAB)
rotary air blast, auger, Bangka, sonic, etc) and details (eg core diameter, drilling techniques were utilised for all holes drilled at the Arya Deposit.
triple or standard tube, depth of diamond tails, face-sampling bit or other
type, whether core is oriented and if so, by what method, etc).
Drill sample recovery · Method of recording and assessing core and chip sample recoveries · For the 2021 program, within acceptable industry standard limits,
and results assessed. all samples collected were of near equal mass and recoveries were also within
acceptable limits for RC drilling and all recorded in the daily logs. Every
· Measures taken to maximise sample recovery and ensure effort was made on site to maximise recovery including cleaning out the sample
representative nature of the samples. trays, splitter and cyclone and ensuring that the drillers progressed at a
steady constant rate for the rig to easily complete each metre effectively.
· 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 · Every metre drilled and sampled was logged geologically in
geotechnically logged to a level of detail to support appropriate Mineral accordance with industry-wide acceptable standard for RC logging and the
Resource estimation, mining studies and metallurgical studies. logging was qualitative in nature with every metre logged. The 2021 program
recorded visible sulphide, carbonate, and graphite concentrations and
· Whether logging is qualitative or quantitative in nature. Core alteration minerals, such as orthoclase, epidote, chlorite, and sericite.
(or costean, channel, etc) photography.
· The total length and percentage of the relevant intersections
logged.
Sub-sampling techniques and sample preparation · If core, whether cut or sawn and whether quarter, half or all Drilling
core taken.
· For the 2021 program, samples with pXRF copper <200ppm will be
· If non-core, whether riffled, tube sampled, rotary split, etc. composited every four metres and all samples were collected to maximise
and whether sampled wet or dry. optimal representation for each sample. If XRF is not available, then all
samples with no visible mineralisation were sampled as above.
· For all sample types, the nature, quality, and appropriateness of
the sample preparation technique. · Each metre sample had an amount removed for washing and cleaning
and sieving then place into metre allocated chip trays. These chips were
· Quality control procedures adopted for all sub-sampling stages to logged on site by the rig geologists and those logs have been saved into a
maximise representivity of samples. spreadsheet and stored on the Company server. Any visible mineralisation,
alteration or other salient features were recorded in the logs. Industry wide,
· Measures taken to ensure that the sampling is representative of acceptable, standard practices were adhered to for the drilling and sampling
the in-situ material collected, including for instance results for field of each metre as per the Drilling and Sampling Procedures set out before
duplicate/second-half sampling. commencement of the drilling programme.
· Whether sample sizes are appropriate to the grain size of the · Any reporting of significant mineralised intervals was on a
material being sampled. received apparent thickness x interval calculation (i.e., thickness averaged).
Rock Chip Sampling
· All surface samples were collected dry.
· The surface sample results described in this ASX Release are
suitable for the reporting 'exploration results' for mineral prospectivity,
additional exploration work would have to be completed to geologically model
and then estimate a mineral resource.
Quality of assay data and laboratory tests · The nature, quality and appropriateness of the assaying and · CCZ's RC holes were assayed by an independent laboratory, ALS at
laboratory procedures used and whether the technique is considered partial or Mt Isa, Townsville, or Brisbane Australia. Methods used were as follows:
total.
o Gold - by method Au-AA25 30g charge (fire Assay with AAS finish).
· For geophysical tools, spectrometers, handheld XRF instruments,
etc, the parameters used in determining the analysis including instrument make o High gold values within oxide zone/supergene zone may need further testing
and model, reading times, calibrations factors applied and their derivation, by method Au-SCR21.
etc.
o Copper and 32 other - by method ME-MS61 (HF-HN03-HCL04 acid digest, HCL
· Nature of quality control procedures adopted (eg standards, leach and ICP-AES finish).
blanks, duplicates, external laboratory checks) and whether acceptable levels
of accuracy (ie lack of bias) and precision have been established. o Over-limit copper (>10,000 ppm 0.01% ) to be re assayed for copper by
method Cu-OC62 (HF-HN03-HCL04 acid digest, HCL leach and ICP-AES finish).
· These analytical methods are considered as suitable and
appropriate for this type of mineralisation.
For the current drilling program ALS Brisbane will analyse all samples. All
elements except for gold were analysed by method ME-MS61 (41 element testing
via Aqua Regia digest then ICP-AES) and with any copper assays >1%, the
copper will be redone using method Cu-OG46 with ICP-AES. The gold was done
by method AA25. All methods used were both suitable and appropriate for the
styles of mineralisation present in the Big One Deposit at the time of
sampling.
Verification of sampling and assaying · The verification of significant intersections by either · All CCZ's RC hole samples have been audited for completeness from
independent or alternative company personnel. ALS have been reviewed by two independent consultant geologists.
· The use of twinned holes. · For current the rock chip sampling, Independent Laboratory
assaying by ALS has confirmed, within acceptable limits, the occurrences of
· Documentation of primary data, data entry procedures, data high-grade copper inferred from the initial XRF readings. Laboratory
verification, data storage (physical and electronic) protocols. standards and duplicates were used in accordance with standard procedures for
geochemical assaying.
· Discuss any adjustment to assay data.
Location of data points · Accuracy and quality of surveys used to locate drill holes · For rock chip samples positions were recorded by handheld GPS
(collar and down-hole surveys), trenches, mine workings and other locations with areas highlighting anomalies sometimes returned to for additional
used in Mineral Resource estimation. sampling and locations checked by handheld GPS.
· Specification of the grid system used. · Locational data for the 4 drillholes completed. Collars are
listed in MGA94 Zone 54 Easting (mE) and Northing (mN); refer to Table AC-1
· Quality and adequacy of topographic control. below.
· The Arya rock chip sample dataset is anticipated on average to
have up to a +/-20m horizontal level of accuracy in sample locations and range
up to a +/-10m of accuracy in sample locations for vertical accuracy.
Surface sample and assay data had been prepared and compiled into Manifold GIS
System and all data converted to GDA94-Zone 54.
Data spacing and distribution · Data spacing for reporting of Exploration Results. · For the Arya surface sampling modelling for copper, the average
RMS sample-to-sample spacing was as follows:
· Whether the data spacing, and distribution is sufficient to
establish the degree of geological and grade continuity appropriate for the o Rock chip 200m
Mineral Resource and Ore Reserve estimation procedure(s) and classifications
applied. · Drillholes were spaced approximately 250m apart.
· Whether sample compositing has been applied.
Orientation of data in relation to geological structure · Whether the orientation of sampling achieves unbiased sampling of · In general, the strike of the Surprise Creek Formation is
possible structures and the extent to which this is known, considering the east-northeast to east, dipping moderately to the north.
deposit type.
· For 'Arya' rock chips there was no fixed orientation as these
· If the relationship between the drilling orientation and the methods were used in the first instance to define distinct areas of
orientation of key mineralised structures is considered to have introduced a anomalisms, based on areas of observed surface mineralisation.
sampling bias, this should be assessed and reported if material.
· For 'Arya' rock chips that produced significant anomalous values
appear to be associated with the mapped fault, fault bounded breccia, and the
Surprise Creek Formation 'PLrd' rock unit ('Prd' historical) that dominates
the 'Arya' prospect to the south of the fault.
· All drilling is intended to be vertical to intersect the dipping
sedimentary beds.
Sample security · The measures taken to ensure sample security. · Each day's RC samples were removed from site and stored in a
secure location off site.
· The RC chip samples taken were securely locked within the vehicle
on site until delivered to Mt Isa for despatch to the laboratory in person by
the field personnel.
Audits or reviews · The results of any audits or reviews of sampling techniques and No external reviews or audits have been undertaken, except for the Independent
data. Geologists Report by SRK in 2019 for the LSE Listing and a review of the
airborne and ground geophysics by the GeoDiscovery Group. Note, the
reference is: Nelson K., Review of open file EM and magnetic geophysical data
at Arya Prospect, GeoDiscovery Group, unpublished confidential report to
Castillo Copper Limited, June 2021, 16pp.
Drilling program summary
The inaugural drilling campaign at the Arya Prospect (Figure AC-1) was
completed in December 2021, after a massive logistical effort to prepare the
drill-pads and heli-lift the rig and all supporting equipment to site (see
Figure AC-2). In each hole thick horizons (up to 55m) of dark grey and black
carbonaceous siltstone / schist were intersected (Figure AC-3), with
scattered, sparse base-metal sulphides, low levels of silver and TREO (to
400ppm), and fine-grained graphite mineralisation occurrences which remains
open in all directions and to depth.
FIGURE AC-1: PROSPECTS COMPRISING THE NWQ COPPER PROJECT
Source: CCZ geology team
FIGURE AC-2: DRILLING AT SITE AR_20 (AR_001RCR)
Location: 351825 mN; 7865551 Mn; Source: CCZ geology team
The "proof of concept" campaign, which eventually only comprised five initial
RC drill-holes at four sites. Delays to the drilling were extensive and have
included:
· Wet weather and flooding.
· Daytime temperatures >43 degrees Celsius.
· Compressor overheating.
· Drill thread breaking.
· Large water flows in each hole drilled.
· Bushfires.
· Helicopter lifts of all gear required between sites and daily travel
to/from site.
· Very hard quartzite wearing down hammer components.
The key focus was drill-testing the three targets identified by BHP in the
mid-1990s including EG01, EG02 and EG10. Of these, EG01 had been interpreted
to potentially be a massive sulphide bedrock conductor 130m thick, 1,500m long
and 450m wide at a revised 100-200m depth.
Drilling to date has found no sign of massive copper sulphide mineralisation,
but instead thick horizons (10-40m) of a dark grey to black carbonaceous,
siltstone to schist, exhibiting scattered base metal mineralisation and
fine-grained graphite occurrences (Figure AC-3). The horizons are not
magnetic, but portable XRF readings, supported by laboratory analyses have
identified scattered anomalous chromium, zinc, cobalt, manganese, and rare
earth element readings throughout the sequence (Figure AC-4). All 1m samples
were collated to 4m composites, then analysed for a comprehensive suite of
trace and rare earth elements, total carbon, and total graphitic carbon.
FIGURE AC-3: AR_001RCR CHIP TRAY 111-120m
Source: CCZ geology team
Post reconciling historic geochemical and geophysical data, the Board decided
it was strategically more prudent to orchestrate a "proof of concept" reduced
campaign comprising five RC drill-holes initially which included sites AR04,
AR08, AR09, AR13 & AR21 (Table AC-1 and Figure AC-4). Vertical holes
were planned however due to the drilling techniques and narrower diameter pipe
employed, several completed drillholes exhibited significant downhole
deviations to the south-east and south-west (Figure AC-5).
The exploration program objective was changed so that if the first-round
observations and geological findings were encouraging, there is built-in
flexibility to expand the campaign to fully drill-test the extent of any
underlying system.
Drilling of AR_002RC progressed to a depth of 238m before the drill string
disintegrated leaving most of the drill string stuck in the hole. The
drillhole had deviated significantly, being almost horizontal at total
depth. Drilling in AR_001RCR through to AR_004RC intersected, hard, dark,
material identified as a carbonaceous schist (See Appendix B). The material
contains no base metal mineralisation, but a low tenor of rare earth elements
(to 400ppm TREO) and graphite (0.5 - 2%; refer to Appendix B) that was
confirmed by laboratory testing.
TABLE AC-1: DRILLHOLE LOCATION
Drillhole Easting Northing AHD Total Depth Azimuth Dip Type Comments
AR_001RC 351793 7865526 202.2 96 175 -85 RC Quartzite to 42m, dark carbonaceous schist to 90m; Major fault @90m.
AR_001RCR 351825 7865551 203.4 142 172 -60 RC/PCD Quartzite then dark carbonaceous siltstones and schists to TD
AR_002RC 352735 7865605 191.8 238 170 -17 RC Quartzite then dark carbonaceous siltstones and schists to TD
AR_003RC 352971 7865433 192.5 143 203 -60 RC Quartzite then dark carbonaceous siltstones and schists to TD
AR_004RC 353486 7865310 188 177 160 -67 RC Quartzite then dark carbonaceous siltstones and schists to TD
Notes: Coordinate system is MGA94-Zone 54, collars are AHD.
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 · The following mineral tenures are held 100% by subsidiaries of
agreements or material issues with third parties such as joint ventures, Castillo Copper Limited, totalling an area of approximately 961km(2) in the
partnerships, overriding royalties, native title interests, historical sites, "NWQ project":
wilderness or national park and environmental settings.
· EPM 26574 (Valparaisa North) - encompasses the Big One historical
· The security of the tenure held at the time of reporting along mineral resource, Holder Total Minerals Pty Ltd, granted 12-June-2018 for a
with any known impediments to obtaining a licence to operate in the area. 5-year period over 100 sub-blocks (323.3Km2), Expires 11-June-2023.
· EPM 26462 (Big Oxide North) - encompasses the 'Boomerang'
historical mine and the 'Big One' historical mine, Holder: QLD Commodities Pty
Ltd, granted: 29-Aug-2017 for a 5-year period over 67 sub-blocks (216.5Km(2)),
Expires: 28-Aug-2022.
· EPM 26525 (Hill of Grace) - encompasses the Arya significant
aeromagnetic anomaly, Holder: Total Minerals Pty Ltd for a 5-year period over
38 sub-blocks (128.8Km2), Granted: 12-June 2018, Expires: 11-June-2023.
· EPM 26513 (Torpedo Creek/Alpha Project) - Granted 13-Aug 2018 for
a 5-year period over 23 sub-blocks (74.2Km2), Expires 12-Aug-2023; and
· EPM 27440 (The Wall) - An application was lodged on the
12-Dec2019 over 70 sub-blocks (~215Km(2)) by Castillo Copper Limited. The
tenure was granted on the 7(th) of March 2021.
Exploration done by other parties · Acknowledgment and appraisal of exploration by other parties. · A selection of historical QDEX / mineral exploration reports has
been reviewed for historical tenures that cover or partially cover the Project
Area in this announcement. Federal and State Government reports supplement the
historical mineral exploration reporting (QDEX open file exploration records).
· Most explorers were searching for Cu-Au-U and/or Pb-Zn-Ag, and,
proving satellite deposit style extensions to the several small sub-economic
copper deposits (e.g., Big Oxide and Josephine).
· With the NWQ Project in regional proximity to Mt Isa and numerous
historical and active mines, the Project area has seen the historical mineral
tenures subject to various styles of surface sampling, with selected locations
typically targeted at specific locations within the NWQ Pillar by shallow
drilling (Total hole depth is typically less than 75m).
· The NWQ project tenure package has a significant opportunity to
be reviewed and explored by modern exploration methods in a coherent package
of EPM's, with three of these forming a contiguous tenure package.
Arya prospect - the five (5) historical exploration reports generated by
various explorers that contributed information and data to this ASX Release
are detailed in the References section of the main body.
Geology · Deposit type, geological setting, and style of mineralisation. · The NWQ project is located within the Mt Isa Inlier of western
Queensland, a large, exposed section of Proterozoic (2.5 billion- to
540-million-year-old) crustal rocks. The inlier records a long history of
tectonic evolution, now thought to be like that of the Broken Hill Block in
western New South Wales.
· The NWQ project lies within the Mt Oxide Domain, straddling the
Lawn Hill Platform and Leichhardt River Fault Trough. The geology of the
tenement is principally comprised of rocks of the Surprise Creek and Quilalar
Formations which include feldspathic quartzites, conglomerates, arkosic grits,
shales, siltstones and minor dolomites and limestones.
· The NWQ Pillar project area is cut by a major fault zone,
trending north-northeast to south-southwest across the permits. This fault is
associated with major folding, forming several tight syncline and anticline
structures along its length.
· The desktop studies commissioned by CCZ on the granted mineral
tenures described four main styles of mineralisation account for most mineral
resources within the rocks of the Mt Isa Province (after Withnall &
Cranfield, 2013).
· Sediment hosted silver-lead-zinc - occurs mainly within fine
grained sedimentary rocks of the Isa Super basin within the
· Western Fold Belt. Deposits include Black Star (Mount Isa PbZn),
Century, George Fisher North, George Fisher South (Hilton) and Lady Loretta
deposits.
· Brecciated sediment hosted copper - occurs dominantly within the
Leichhardt, Calvert, and Isa Super basin of the Western Fold Belt, hosted in
brecciated dolomitic, carbonaceous, and pyritic sediments or brecciated rocks
proximal to major fault/shear zones. Includes the Mount Isa copper orebodies
and the Esperanza/Mammoth mineralisation.
· Iron-oxide-copper-gold ("IOCG") - predominantly chalcopyrite,
pyrite magnetite/hematite mineralisation within high grade metamorphic rocks
of the Eastern Fold Belt. Deposits of this style include Ernest Henry,
Osborne, and Selwyn; and
· Broken Hill type silver-lead-zinc - occur within the high-grade
metamorphic rocks of the Eastern Fold Belt. Cannington is the major example,
but several smaller currently sub-economic deposits are known.
· Gold is primarily found associated with copper within the IOCG
deposits of the Eastern Fold Belt. However, a significant exception is noted
at Tick Hill where high grade gold mineralisation was produced, between 1991
and 1995 by Carpentaria Gold Pty Ltd, some 700 000 tonnes of ore was mined at
an average grade of 22.5 g/t Au, producing 15 900 kg Au. The Tick Hill deposit
style is poorly understood (Withnall & Cranfield, 2013).
· ROM Resources had noted in a series of recent reports for CCZ on
the granted tenures, that cover the known mineralisation styles including:
o Stratabound copper mineralisation within ferruginous sandstones and
siltstones of the Surprise Creek Formation.
o Disseminated copper associated with trachyte dykes.
o Copper-rich iron stones (possible IOCG) in E-W fault zones; and
o possible Mississippi Valley Type ("MVT") stockwork sulphide mineralisation
carrying anomalous copper-lead-zinc and silver.
· The Mt Oxide and Mt Gordon occurrences are thought to be breccia
and replacement zones with interconnecting faults. The Mt Gordon/Mammoth
deposit is hosted by brittle quartzites, and Esperanza by carbonaceous shales.
Mineralisation has been related to the Isan Orogeny (1,590 - 1,500 Ma).
· Mineralisation at all deposits is primarily
chalcopyrite-pyrite-chalcocite, typically as massive sulphide within breccias.
· At the Big One prospect, West Australian Metals NL described the
mineralisation as (as sourced from the document "West Australian Metals NL,
1994. Drill Programme at the "Big One" Copper Deposit, North Queensland for
West Australian Metals NL."):
· The targeted lode / mineralised dyke is observable on the
surface. The mineralisation targeted in the 1993 drilling programmed is a
supergene copper mineralisation that includes malachite, azurite, cuprite, and
tenorite, all associated with a NE trending fault (062(o) to 242(o)) that is
intruded by a porphyry dyke.
· The mineralised porphyry dyke is vertical to near vertical
(85(o)), with the 'true width' dimensions reaching up to 7m at surface. o At
least 600m in strike length, with strong Malachite staining observed along the
entire strike length, with historical open pits having targeted approximately
200m of this strike. Exact depth of mining below the original ground surface
is not clear in the historical documents, given the pits are not battered it
is anticipated that excavations have reached 5m to 10m beneath the original
ground surface.
· Associated with the porphyry dyke are zones of fractured and/or
sheared rock, the siltstones are described as brecciated, and sandstones
around the shear as carbonaceous.
· The known mineralisation from the exploration activities to date
had identified shallow supergene mineralisation, with a few drillholes
targeting deeper mineralisation in and around the 200m of strike historical
open A strongly altered hanging wall that contained malachite and cuprite
nodules. Chalcocite mineralization has been identified but it is unclear on
the prevalence of the Chalcocite; and the mineralisation was amenable to high
grade open pit mining methods of the oxide mineralization (as indicated by
numerous historical open pit shallow workings into the shear zone).
· Desktop studies commissioned by CCZ and completed by ROM
Resources and SRK Exploration have determined that the Big One prospect is
prospective for Cuco, and Ag.
· Desktop studies commissioned by CCZ have determined the Boomerang
prospect contains:
· Secondary copper staining over ~800m of strike length.
· Associated with a major east-west trending fault that juxtaposes
the upper Surprise Creek Formation sediments against both the underlying Bigie
Formation and the upper Quilalar Formation units.
· At the 'Flapjack' prospect there is the potential for:
o Skarn mineralisation for Cu-Au and/or Zn-Pb-Cu from
replacement carbonate mineralisation, particularly the Quilalar Formation.
o Thermal Gold Auroele mineralisation is a potential model due to the high
silica alteration in thermal aureole with contact of A-Type Weberra Granite -
related to the Au mineralisation; and/or
o IOCG mineralisation related to chloride-rich fluids.
· At the 'Crescent' prospect there is the potential for:
o Skarn mineralisation for Cu-Au and/or Zn-Pb-Cu from replacement
carbonate mineralisation, particularly the Quilalar Formation; and/or
o Thermal Gold Auroele mineralisation is a potential model due to the high
silica alteration in thermal aureole with contact of A-Type Weberra Granite -
related to the Au mineralisation; and
o IOCG mineralisation related to potassic rich fluids.
· At the 'Arya' prospect there is the potential for:
o Supergene mineralisation forming at the surface along the fault, fault
breccia, and the Surprise Creek Formation 'PLrd' rock unit ('Prd' historical).
o Epigenetic replacement mineralisation for Cu (with minor components of
other base metals and gold) from replacement carbonate mineralisation,
particularly the Surprise Creek Formation.
o Skarn mineralisation for Cu-Au and/or Zn-Pb-Cu from replacement carbonate
mineralisation, particularly the Surprised Creek Formation; and/or
o IOCG mineralisation related to chloride rich fluids.
A selection of publicly available QDEX documents / historical exploration
reports have been reviewed, refer to Section 2, sub-section "Further Work" for
both actions in progress and proposed future actions.
Drill hole Information · A summary of all information material to the understanding of the · There is no historical drilling at Arya.
exploration results including a tabulation of the following information for
all Material drill holes: · For the 2021 program, all drillhole information was coded to the
same formatted spreadsheets used by CCZ, using the LogCheck field software.
o easting and northing of the drill hole collar
· For CCZ's current drilling program, this information has been
o elevation or RL (Reduced Level - elevation above sea level in metres) of recorded in formatted spreadsheets during the drilling and will be checked and
the drill hole collar verified at the conclusion of the current program.
o dip and azimuth of the hole · A summary of the holes drilled are given in Table AC-1 in Section
1 of Appendix C, above.
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 data aggregation methods are utilised in the current ASX
maximum and/or minimum grade truncations (e.g. cutting of high grades) and Release, since the sampling types are surface rock chip samples.
cut-off grades are usually Material and should be stated.
· 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 · The strike of the country rock is northeast to east, with the
of Exploration Results. deep Arya conductor is orientated east - west. The smaller, shallower
conductors strike north-northeast to northeast. The main faulting trends is
· If the geometry of the mineralisation with respect to the drill northeast.
hole angle is known, its nature should be reported.
· When available, all mineralised intervals (i.e., >500ppm) will
· If it is not known and only the down hole lengths are reported, be reported in future ASX releases as the "as-intersected" apparent thickness
there should be a clear statement to this effect (eg 'down hole length, true (in metres) and given that all drillholes dip at -90 degrees from the
width not known'). horizontal, true intersection widths will be calculated during the block
modelling process.
Diagrams · Appropriate maps and sections (with scales) and tabulations of · This part will be done once CCZ's current drilling program is
intercepts should be included for any significant discovery being reported completed, and all samples have been assayed and verified.
These should include, but not be limited to a plan view of drill hole collar
locations and appropriate sectional views. · Appropriate diagrams are presented in the body and the Appendices
of the current ASX Release. Where scales are absent from the diagram, grids
have been included and clearly labelled to act as a scale for distance.
· Maps and Plans presented in the current ASX Release are in MGA94
Zone 54, Eastings (mN), and Northing (mN), unless clearly labelled otherwise.
Balanced reporting · Where comprehensive reporting of all Exploration Results is not · Comprehensive reporting was completed (Biggs 2022) once CCZ's
practicable, representative reporting of both low and high grades and/or drilling program had all sample queries returned and have been verified.
widths should be practiced to avoid misleading reporting of Exploration
Results. o Appropriate diagrams are presented in the body and the Appendices of the
current ASX Release (see Figure AC-5 and AC-6). Where scales are absent from
the diagram, grids have been included and clearly labelled to act as a scale
for distance.
· A complete comparison of visual mineralisation estimated by the
site geologist will be published once all assays are returned. All
intersected intervals are apparent thicknesses in metres.
Other substantive exploration data · Other exploration data, if meaningful and material, should be GEOTEM & PROTEM:
reported including (but not limited to): geological observations; geophysical
survey results; geochemical survey results; bulk samples - size and method of · The airborne electromagnetic GEOTEM geophysical survey undertaken
treatment; metallurgical test results; bulk density, groundwater, geotechnical by BHP Minerals in 1997 on historical tenure EPM11383 & EPM1152. A total
and rock characteristics; potential deleterious or contaminating substances. of 726-line kilometres were flown on a SE-NW, flown by 'Geoterrex-Dighem Pty
Limited' at a mean height of approximately 105m above the ground surface (line
spacing 500m apart). Previous interpretations the penetration of the GEOTEM
method to have an estimated range of between 200-300m below the ground
surface, this is dependent on conductivity contrasts, size, and attitude of
the subsurface targets. Eleven (11) anomalies were identified, with four (4)
recommended for follow up, with three (3) of the four (4) anomalies followed
up by ground geophysical at what CCZ calls the 'Arya' prospect. The BHP
Minerals 1997 GEOTEM survey information was extracted from QDEX Data to
accompany the QDEX report information.
· The 'Arya' prospect anomalies are EG01, EG02, EG10, with the
geophysical observations of the body and Appendices of the current ASX
Release, including the PROTEM observations. The PROTEM observations are
anticipated to have a deeper penetration than the GEOTEM observations, based
on the PROTEM loop, survey traverse, and/or depth sounding method applied.
QUESTEM & GENIE-EM:
· The airborne electromagnetic GEOTEM geophysical survey undertaken
by Mount Isa Mines in 1991 on historical tenure EPM7448, EPM7338, and EPM7863.
A total of approximately 600km-line kilometres (exact line length would need
to be extracted from digitised images) would were flown on a SE-NW, flown by
'Aerodata Holdings Limited' at a mean height of approximately 120m above the
ground surface (line spacing 400m apart). In a previous ASX release (July
2020) Xplore Resources Pty Ltd interprets the penetration of the QUESTEM
method to have an estimated range of between 200-300m below the ground
surface, this is dependent on conductivity contrasts, size, and attitude of
the subsurface targets. Twentynine (29) anomalies were identified across the
three (3) historical tenure, with six (6) recommended for follow up ground
geophysical survey for historical tenure EPM7448, and one of these L4 near the
Arya prospect.
· Arya prospect anomaly L4 followed up by a ground electromagnetic
traverse by Mount Isa Mines GENIE-EM is to the west of the EG02 BHP minerals
anomaly.
· Queensland Government Data: 'PLrd' rock unit lower boundary from
the Surprise Creek Formation sourced from QSpatial and aligns with GeoResGlobe
- this is equivalent to the historical tenure reports 'Prd' rock unit lower
boundary from the Surprise Creek Formation.
GEODISCOVERY REVIEW
The study of Nelson (2021) concluded that:
· Whilst hard copies of the 1997 BHP ground EM data are available,
no digital data is on open file. Hard copy profiles have been visually
interpreted, however due to lack of digital data it cannot be remodelled.
The historic BHP model results and survey locations have not been provided and
there is uncertainty in the location of Anomaly E02.
· Magnetic modelling, CDI and LEI of the TEMPEST survey line
indicate the BHP depth estimate of conductive from the EG01 sounding is likely
over estimated. Depth to main conductive sources appears to be between
around 200m beneath surface (Nelson (2021).
· EG02 appears to be associated with a fault and EG10 appears to be
more surficial.
· It is recommended that the LEI of the TEMPEST survey (most recent
AEM data acquired in the region), along with magnetic model output be used to
plan the next drill campaign. The current drill plan could be improved to
better test the modelled conductive sources and structural features.
· If the drill testing of the conductive sources indicates the
presence of prospective lithologies and/or mineralisation, then consideration
should be given to acquiring detailed ground EM and magnetic coverage to
further assist targeting.
Further work · The nature and scale of planned further work (eg tests for · Further work will consist of a combination of:
lateral extensions or depth extensions or large-scale step-out drilling).
o Fourteen (14) hole RC drilling Program
· Diagrams clearly highlighting the areas of possible extensions,
including the main geological interpretations and future drilling areas, o Soil and or Rock chip sampling
provided this information is not commercially sensitive.
o Ground IP or EM Survey
FIGURE AC-4: ARYA DRILLHOLE LOCATION vs EM ANOMALY
Notes:
1. Coordinate system is MGA94-Zone 54, collars are AHD.
2. Shows EM anomalies, MIM EM airborne survey, Location of
AusAEM survey line 2024_003, and the "as drilled" 2021 collars.
FIGURE AC-5: ARYA DRILLHOLE LOCATION AND GRAPHITE INTERSECTIONS
Notes:
1. View at Ayra looking north-east, showing topography (2m
contours) and drilling.
2. Coloured bars represent Cg >0.5%, with purple higher grade
(>1% TGC).
3. Light green polygons (see Figure AC-4) present surface copper
anomalies (>250ppm Cu) untested by drilling.
4. Source: CCZ Geology Team.
References
Anaconda Australia Inc., 1971. Authority to Prospect 791M "Myally",
Queensland. Final Report. QDEX Report number: 3544.
Biggs M.S., 2021, EPM 26525 Hill of Grace - 2021 Arya Drilling and Exploration
Program, End of Hitch Report - Drilling, Assay, and Metallurgical Testing
Completed, July 2022, unpublished report by ROM Resources for Castillo Copper
Limited.
BHP Minerals Pty Ltd, 1997. EPM 11383 (Alsace Camp), 11452 (Epsilon), Combined
Annual Report for the Period Ending 19/12/97. QDEX Report number: 29762.
BHP Minerals Pty Ltd, 1998. EPM 11383 (Alsace Camp), 11452 (Epsilon), Combined
Annual/Final Report for the Period Ending 19/12/98. QDEX Report number: 30750
CCZ ASX Release - 28 April 2020.
CRA Exploration Pty Limited, 1995. Exploration Report for Minerals No. 9575
"Epsilon", Queensland. Annual Report for the period ended August 3, 1995. QDEX
Report number: 27102.
CRA Exploration Pty Limited, 1996. Exploration Report for Minerals No. 9575
"Epsilon", Queensland. Third Annual and Final Report for the Period Ending 2
July 1996. QDEX Report number: 28337
GeoResGlobe, 2021, Detailed Geology 1:100,000 layers.
https://georesglobe.information.qld.gov.au/ Accessed 2021-Jun-21.
M.I.M Exploration Pty Ltd, 1992a, Exploration Permit for Minerals No. 7863
"Eldorado" Queensland. Annual Report for the 12 months ended April 17, 1992.
QDEX Report number: 23661.
M.I.M Exploration Pty Ltd, 1992b "Myally Creek" EPM 7338 and "Lagoon Creek"
EPM 7448 Joint Twelve Month Report for Period 18 May 1990 to 18 May 1991
Queensland, Australia. QDEX Report number: 23516.
Mt Isa Metals Ltd, 2010. EPM 15767, Myally Tenement, Annual Report for the
Period 5/06/2009 to 4/6/2010. QDEX Report number: 64491.
M.I.M Exploration Pty Ltd, 1993. Exploration Permit for Minerals Nos. 7448
"Lagoon Creek". Second Annual Report 18 May 1991 to 17 May 1992, Queensland
Australia. QDEX Report number: 24523.
Nelson K., 2021, Review of open file EM and magnetic geophysical data at Arya
Prospect, GeoDiscovery Group, unpublished confidential report to Castillo
Copper Limited, June 2021, 16pp
Pacminex Pty Limited, 1975, Authority to Prospect No. 1494M "Alsace Area",
Queensland. Annual Report. QDEX Report number: 5602.
Queensland Government, 2021. Queensland Geology Detailed Web Map Service:
http://qldspatial.information.qld.gov.au/catalogue/custom/search.page?q=solid+geology#
Schulz, M., Liu, J., and de Nooy, D., 2022, MIN5684 (A23397), Castillo Copper
Ltd, Graphite Optical Analysis, ALS Metallurgical Services, May 2022, 18pp
Valenta, R., 2018. NW Queensland Mineral Province Deposit Atlas Prototype
Report - the Mount Isa and Ernest Henry Deposits. DNRME-GSQ Commissioned study
and report.
This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. Terms and conditions relating to the use and distribution of this information may apply. For further information, please contact
rns@lseg.com (mailto:rns@lseg.com)
or visit
www.rns.com (http://www.rns.com/)
.
RNS may use your IP address to confirm compliance with the terms and conditions, to analyse how you engage with the information contained in this communication, and to share such analysis on an anonymised basis with others as part of our commercial services. For further information about how RNS and the London Stock Exchange use the personal data you provide us, please see our
Privacy Policy (https://www.lseg.com/privacy-and-cookie-policy)
. END UPDEAXFAAAPDEFARecent news on Castillo Copper
See all newsREG - Castillo Copper Ltd - March 2024 Quarterly Activities Report
AnnouncementREG - Castillo Copper Ltd - Completion of Sale of Broken Hill Licenses
AnnouncementREG - Castillo Copper Ltd - Initial and Final Director’s Interest Notice
AnnouncementREG - Castillo Copper Ltd - Half-year Financial Report
AnnouncementREG - Castillo Copper Ltd - Board Changes
Announcement