REG - Red Rock Resources - Copper and Cobalt Drilling in DRC
15/02/2022 13:00
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RNS Number : 7637B Red Rock Resources plc 15 February 2022
Red Rock Resources PLC
("Red Rock" or the "Company")
Copper and Cobalt Drilling in DRC -
Positive Results, High Grade Cobalt Encountered
15 February 2022
Red Rock Resources Plc. ("Red Rock" or "the Company"), is a natural resource
development company with interests in gold and base metals, principally in
Africa and Australia. The Company today announces, further to the announcement
of 11 October 2021 and later updates, the results of the reverse circulation
(RC) drill programme at the Luanshimba copper-cobalt project in the
Haut-Katanga Province of the Democratic Republic of Congo.
The Luanshimba project is operated by Red Rock Galaxy SA, an 80% owned
Congolese subsidiary of Red Rock. The drill programme was carried out by
Rubaco SARL, with geological supervision being provided by Minerals
Exploration Associates SARL ("Minex Consulting SARL" or "Minex").
Highlights:
· 2,763 samples from the 2,469m, 29 hole programme now analysed and
returned.
· Three prospects now named as Kilembwe (18 holes), Luanshimba North (9
holes) and Luanshimba East (2 holes) drilled. (See Fig 1 below)
· 7 holes stopped before target depth due to ground conditions and
general limit of drilling 100m due to rig limitations.
· Copper intersections of significance include:
o 6 metres at 0.61% (including 1 metre at 1.45%) towards the bottom of hole
DRC014 at Kilembwe
o 3 metres at 0.7% and 3m at 1.14% encountered towards the bottom of holes
DRC019 and DRC021 at Luanshimba North.
· Copper intercepts appear to be present as hypogene chalcopyrite in
reduced dolomite underlying carbonaceous shales with pyrite, in a sequence
interpreted as similar to the Kitwe Formation of the Zambian Copperbelt.
· Future exploration will test the potential 1.3km of continuity
between these two areas of reduced dolomite underlying carbonaceous shale with
potential copper/cobalt ores at depth, and will test for the copper
mineralisation extending towards surface as it approaches the keel of the
syncline to the South.
· Cobalt is extensively present, occurring as heterogenite in fault
gouges and breccias; notably:
o 43m at 0.13% including 11m at 0.2% at Kilembwe in DRC015 in a brecciated
argillaceous arenite
o 3m at 0.37% related to a fault gouge, overlying 13m at 0.10% in a
brecciated argillaceous arenite at Kilembwe in DRC008
o 5m at 0.78% including 2m at 1.4% at DRC023 in Luanshimba East.
· This combination of occasional high Cobalt grades, with areas of
considerable vertical extent of mineralisation, suggest that although
weathering has been a significant factor in mineralisation there are likely to
be others, requiring further drill testing.
Figure 1: Luanshimba Project RC holes on Cu geochem anomaly map
http://www.rns-pdf.londonstockexchange.com/rns/7637B_1-2022-2-15.pdf
(http://www.rns-pdf.londonstockexchange.com/rns/7637B_1-2022-2-15.pdf)
Red Rock Chairman Andrew Bell comments: "We carried out an initial drill
programme to test the hypothesis that the geochemical anomalies and favourable
geophysics were not associated with potentially significant mineralisation.
The fences were 100m apart and we only drilled at intervals of 200m or more,
so the drilling was wide-spaced, and only to about 100m depth, so through the
water table but hardly beyond. We could easily have missed every target, and
could hardly expect to hit any bullseyes.
What has been achieved has therefore greatly exceeded our expectations and can
be considered a success, identifying but barely penetrating a potentially
large Copper-bearing structure, as well as encountering significant
thicknesses and some exceptional grades of Cobalt which with closer-spaced RAB
drilling can be better defined.
Several holes ended just as they were entering promising pyrite and
chalcopyrite mineralisation, and the next stage of exploration will need to
include diamond drilling to increase structural understanding and to test for
Copper and Cobalt bearing ores deeper in the sequence."
Background
Red Rock owns 80% of the Luanshimba Project, which is situated 65 km
south-east of the provincial capital of Lubumbashi in Haut-Katanga, in a 420
hectare prospecting license (PR13513) in the Congolese Copper belt.
Figure 2: Comparative Katangan stratigraphy of the Zambian and Katangan
Copperbelt
http://www.rns-pdf.londonstockexchange.com/rns/7637B_2-2022-2-15.pdf
(http://www.rns-pdf.londonstockexchange.com/rns/7637B_2-2022-2-15.pdf)
The tenement is situated along a disrupted anticline with Roan sediments
draping off a nearby basement dome.
Drilling tends to confirm the historical geological overview that most of the
permit is underlain by a gently NW-plunging asymmetric syncline whose westerly
limb is best revealed by probing in Luanshimba North. Here, there is a thick
sequence of interbedded siltstones, shale and dolomite that is probably
correlative of the Zambian Kitwe formation which includes the "Ore Shale"
horizon. There is a tendency for thicker dolomite to prevail in the more
northerly holes which would equate more likely with the Upper Roan. However,
the sequence is severely disrupted by thick breccias that may have an easterly
to NW-SE orientation. However, without diamond drill core, the positioning of
the optimum ore bands and their equivalence with the Katangan Mines Series
still needs to be determined.
Summary of the Drill Results
In both Kilembwe and Luanshimba North prospects, the RC drilling was placed
along 14 cross-sections 100 metres apart; 12 are oriented SSW-NNE,
approximately perpendicular to the presumed structural and stratigraphic
strike. The remaining 2 are situated in the Luanshimba East Prospect.
While relatively few potentially economically significant intercepts were
documented, 1-6m segments of sub-marginal Cu (0.1-0.4% Cu) along with Co close
to or just above the 0.1% cut-off occur mostly in dolomite and immediately
adjacent siltstones. The possibility of redox contrasts and a less permeable
capping by pelitic sediments cannot be ruled out.
In the Kilembwe area, siltstones, silty arenites and shales dominate over
dolomitic beds and in the southernmost holes overlie sandstone and arkosic
arenites typical of the footwall to mineralization in the Zambian
stratigraphy. However, the inferred arcuate easterly trending fault and
associated breccias disrupt the sequence and bring the footwall arenites much
closer to the surface in the southern holes. Despite the absence of Cu in the
footwall sandstones, the Cu soil geochemical anomaly still persists until the
edge of the permit because of redistribution by weathering from siltstones,
breccias and dolomites that overlie arenites. Sub-marginal Cu and significant
cobalt occur mostly in argillaceous sediments much more frequently than in
dolomite, particularly where they have been fractured and brecciated while
localized enrichment occurs in association with shallow weathered breccias and
fault gouge.
With only 2 holes at Luanshimba East and deep weathering, results are too
sparse to comment with authority except that some significant superficial
enrichment was noted (DRC023). The sequence appears to be highly disturbed by
faulting as both sandstone and dolomite are juxtaposed.
Regarding copper, good results were received from two holes DRC014 and DRC021
in both Kilembwe and Luanshimba North prospects. DRC 014 revealed 1m at 1.45%
Cu using a cut-off grade of 1% Cu and 6m at 0.61% Cu with a cut-off grade of
0.5% Cu, while DRC021 returned 3m at 1.14% Cu with a cut-off grade of 1% Cu.
In both holes the mineralised zone occurs as hypogene chalcopyrite hosted in a
greenish grey dolomite underlying 5 to 10 metres thick carbonaceous shale
carrying pyrite. This might indicate the hole intersected a more distal pyrite
zone, and the chalcopyrite occurring below indicates a vector towards better
copper mineralization.
Additional holes showed modest to mediocre Cu values at a cut-off grade of
0.5% Cu. DRC019 drilled in Luanshimba North intersected 3m at 0.70% Cu. In
this hole, copper occurs as chalcopyrite in the same greenish-grey dolomite
underlying the carbonaceous shale. At Luanshimba East, DRC023 contained 2m at
0.70% Cu hosted in the lateritic overburden and is most likely associated with
superficial secondary enrichment.
The Luanshimba North Prospect is believed to occur in the Kitwe Formation or
its Katangan equivalent and locally is characterised by dolomite, dolomitic
siltstone alternating with chert, carbonaceous shale, argillaceous siltstone
and in places intensely brecciated zones. Copper mineralisation is displayed
as disseminated and blebby chalcopyrite overlying a pyritic zone characterised
by fine grained disseminated pyrite hosted in the carbonaceous shale.
The following Intercepts table summarizes the copper grade, thickness and the
lithological unit that host the copper mineralisation:
Project ID Prospect ID Hole ID From To Litho Thickness (m) Grade Cu%
Luanshimba Kilembwe DLSB_DRC001 Below cut-off grade
DLSB_DRC002 Below
cut
-off
grade
DLSB_DRC003 Below
cut
-off
grade
DLSB_DRC004 Below
cut
-off
grade
DLSB_DRC005 Below
cut
-off
grade
DLSB_DRC006 Below
cut
-off
grade
DLSB_DRC007 Below
cut
-off
grade
DLSB_DRC008 Below
cut
-off
grade
DLSB_DRC009 Below
cut
-off
grade
DLSB_DRC010 Below
cut
-off
grade
DLSB_DRC011 Below
cut
-off
grade
DLSB_DRC012 Below
cut
-off
grade
DLSB_DRC013 Below
cut
-off
grade
DLSB_DRC014 89.00 95.00 Dolomite 6.00 0.61
DLSB_DRC015 Below
cut
-off
grade
DLSB_DRC016 Below
cut
-off
grade
DLSB_DRC017 Below
cut
-off
grade
DLSB_DRC018 Below
cut
-off
grade
Luanshimba North DLSB_DRC019 90.00 93.00 Dolomite 3.00 0.70
DLSB_DRC020 Below cut-off grade
DLSB_DRC021 97.00 100.00 Dolomite 3.00 1.14
DLSB_DRC022 Below cut-off grade
Luanshimba East DLSB_DRC023 8.00 10.00 OVB 2.00 0.70
DLSB_DRC024 Below cut-off grade
Luanshimba North DLSB_DRC025 Below cut-off grade
DLSB_DRC026 Below cut-off grade
DLSB_DRC027 Below cut-off grade
DLSB_DRC028 Below cut-off grade
DLSB_DRC029 Below cut-off grade
Table 1: ALS Assays results for the Luanshimba RC holes - 0.5% Cu Cut-off
grade
Regarding cobalt analyses, good results were obtained from most of the RC
holes drilled in the Kilembwe Prospect. Cobalt mineralisation occurs as
heterogenite in replacement mode within fault gouges and strongly brecciated
layers affecting the Mindola Formation. The following table summarizes the
cobalt intercepts observed at Luanshimba. Good results were received from
DRC015 which intersected 43m at 0.13 % Co including 11m at 0.20% Cu hosted in
a brecciated argillaceous arenite. DRC014 cut 12m at 0.11% Co hosted in fault
gouge. DRC008 reveals 3m at 0.37% Co related to a fault gouge that overlies
13m at 0.10% Co hosted in a brecciated argillaceous arenite. DRC010 shows 8m
at 0.14% Co hosted in fault gouge. The results are reported in Table 2 below.
In the Luanshimba East Prospect, excellent results were received from DRC023
with 5m at 0.78% Co including 2m at 1.59% Co. Here, cobalt mineralisation
occurs as superficially enriched heterogenite hosted in the lateritic
overburden and is associated with low grade copper.
In both Luanshimba North and East Prospects, cobalt mineralisation occurs as
matrix replacement associated with black iron oxides hosted in fault gouge
(DRC024) and/or in weathered fractures in carbonaceous shale and dolomite.
Project ID Prospect ID Hole ID From To Litho Thickness (m) Grade Co%
Luanshimba Kilembwe DLSB_DRC001 56.00 58.00 Fault Gouge 2.00 0.33
61.00 63.00 Fault Zone 2.00 0.10
66.00 68.00 Siltstone 2.00 0.11
DLSB_DRC002 53.00 56.00 Fault Gouge 3.00 0.17
61.00 63.00 SDOX 2.00 0.11
DLSB_DRC003 46.00 49.00 Brecciated Zone 3.00 0.14
54.00 56.00 Brecciated Zone 2.00 0.10
DLSB_DRC004 38.00 42.00 Fault Gouge 4.00 0.12
47.00 48.00 SDO 1.00 0.14
DLSB_DRC005 6.00 8.00 Fault Gouge 2.00 0.14
DLSB_DRC006 3.00 4.00 Lateritic OVB 1.00 0.14
24.00 25.00 Fault Gouge 1.00 0.13
51.00 52.00 Fault Gouge 1.00 0.23
DLSB_DRC007 4.00 9.00 Lateritic OVB 5.00 0.15
17.00 18.00 Fault Gouge 3.00 0.14
33.00 35.00 Fault Gouge 2.00 0.12
DLSB_DRC008 30.00 33.00 Fault Zone 3.00 0.37
39.00 40.00 Fault Gouge 1.00 0.11
47.00 61.00 Brecciated Arenite 13.00 0.10
DLSB_DRC009 11.00 14.00 Fault Gouge 3.00 0.11
DLSB_DRC010 60.00 68.00 Fault Gouge 8.00 0.14
DLSB_DRC011 47.00 49.00 Fault Gouge 2.00 0.13
DLSB_DRC012 23.00 24.00 Fault Zone 1.00 0.14
DLSB_DRC013 Below
cut
-off
DLSB_DRC014 26.00 38.00 Fault Zone 12.00 0.11
78.00 79.00 Laminated Shale 1.00 0.18
89.00 90.00 Dolomite 1.00 0.12
DLSB_DRC015 16.00 17.00 Lateritic OVB 1.00 0.11
20.00 22.00 Lateritic OVB 2.00 0.12
34.00 83.00 Argillaceous Arenite 43.00 0.13
DLSB_DRC016 1.00 2.00 Lateritic OVB 1.00 0.12
19.00 20.00 Argillaceous Arenite 1.00 0.12
30.00 31.00 Argillaceous Arenite 1.00 0.11
DLSB_DRC017 8.00 9.00 Lateritic OVB 1.00 0.11
15.00 16.00 Argillaceous Siltstone 1.00 0.11
DLSB_DRC018 55.00 61.00 Fault Gouge 5.00 0.20
Luanshimba North DLSB_DRC019 77.00 100.00 Dolomite 19.00 0.16
DLSB_DRC020 Below cut-off
DLSB_DRC021 76.00 77.00 Carbonaceous Shale 1.00 0.12
97.00 100.00 Dolomite 3.00 0.16
DLSB_DRC022 Below cut-off
Luanshimba East DLSB_DRC023 5.00 11.00 Lateritic OVB 5.00 0.78
15.00 16.00 Fault Gouge 1.00 0.13
DLSB_DRC024 59.00 63.00 Dolomite 3.00 0.16
Luanshimba North DLSB_DRC025 Below cut-off
DLSB_DRC026 12.00 14.00 Lateritic OVB 2.00 0.14
DLSB_DRC027 Below cut-off
DLSB_DRC028 Below cut-off
DLSB_DRC029 Below cut-off
Table 2: ALS Assays results for the Luanshimba RC holes - 0.1% Co Cut-off
grade
Additional Notes and Interpretations
An examination of the overall thickness and the grade of the intercepts
identified two separate zones: the first coincides with the Kilembwe Prospect
which occurs in the Mindola Formation. Supergene oxide mineralisation is
mostly related to the faulting system in this target. A plot of the cumulative
thickness of the cobalt intercepts shows a SSW-NNE trend and is open towards
the SW (see Fig 3).
Figure 3: Cumulative thickness of Co Intercepts for the Kilembwe Prospect
http://www.rns-pdf.londonstockexchange.com/rns/7637B_3-2022-2-15.pdf
(http://www.rns-pdf.londonstockexchange.com/rns/7637B_3-2022-2-15.pdf)
Note that the cobalt mineralisation intercepted in the DRC014 (1m at 1.14% Cu
and 0.16% Co) is apparently not related to any fault system. On the contrary,
the cobalt mineralisation lies within both argillaceous dolomite and dolomite
associated with a reduced litho-facies that may also be responsible for
enhanced copper grades.
The frequent association between possible localized Co-Cu mineralization with
fault structures, wide spacing of the drill holes together with their vertical
dip signifies that if lateral metal dispersion in the weathered environment is
not extensive, there could be possible discrepancies between the thicknesses
of Co mineralization shown above in Figure 7 and actual positions of other
mineralized structures. Thus, the inferred faults based on historical mapping
may be inaccurate, or significant mineralization is controlled by the
intersection of some other structures with favourably mineralized sediments.
Luanshimba North revealed good copper mineralization such as the RC hole
DRC021 that intercepted 3m at 1.14% Cu associated with 3m at 0.16% Co from
97.00 to 100.00m; both copper and cobalt are hosted in a greenish grey
dolomite showing disseminated chalcopyrite. The footwall to this reduced
dolomite in both RC holes DRC014 and DRC021 is pyritic carbonaceous shale.
This indicates a typical mineral zonation that characterizes the Ore Shale
Member of the Kitwe Formation and also parts of the equivalent typical R2
Mines Series in Katanga. Similar lithological units and mineral zonation were
intercepted in RC holes DRC020, DRC019, DLSB_DRC022 and DRC025 situated in the
vicinity of DRC021.
Using a cut-off grade of 0.5% Cu, significant intercepts averaging 6m at 0.61%
Cu in DRC014 hosted in the reduced dolomite underlying the carbonaceous shale,
while DRC019 averaged 3m at 0.70% Cu from the same reduced dolomite with the
similar mineral zonation. Assuming there is continuity of the reduced
mineralized dolomite between these two areas, there could be a prospective
stretch about 1.3km long which is open ended in all directions except the
southeast (Fig 4).
Figure 4: Luanshimba North Mineral zonation showing both reduced and oxidized
facies
http://www.rns-pdf.londonstockexchange.com/rns/7637B_4-2022-2-15.pdf
(http://www.rns-pdf.londonstockexchange.com/rns/7637B_4-2022-2-15.pdf)
QAQC Procedure and Analysis
A total of 2,763 RC samples were collected from the Phase I RC Drilling on the
Luanshimba Project among which duplicates, standards and blank samples are
included.
About 2 kgs of rock chips sample were collected as a composite for each metre
drilled and placed into a labelled plastic bag with a labelled ticket book
having the same number within it.
Minex established a clear industry best practice QA/QC procedure regarding the
collection of accurate data regarding the sampling protocol for the RC
drilling programme. Duplicates and standards (certified reference materials,
CRMs) are inserted into the sample batch at a rate of one in twenty, and blank
samples are inserted at a rate of one in fifty samples.
Field duplicates were inserted after each 20 samples prior to the samples
being sent to the preparation laboratory. Samples collected from one or two RC
Holes were put into one batch and a dispatch form was filled out by the field
technician and signed off by the field geologist.
Sixteen batches were constituted and dispatched to the Congo Analytical
Laboratory (COAL) which is operating the ALS Preparation Laboratory facilities
in Lubumbashi. The samples collected at from the field were dried, crushed and
pulverized at the COAL prep lab and two samples of about 50 g of were
produced: one was sent to ALS Geochemistry JHB in South Africa for analysis
and the other was sent back to the Minex office to be analyzed using a
portable XRF spectrometer.
Standard and blank CRM were inserted into the batches at the Minex office
prior to send all the batches the analytical laboratory (ALS). A list of all
the CRMs inserted into each batch is secure into the company database for
further reference.
Multi-element ICP method was requested to analyse all samples and any
over-limit high grade sample that gave back high-grade assays (Cu-Co) was then
analysed using the specified Cu-Co analysis designed under the ALS code
ME-OG62.
Three certified reference materials (CRM) were used as field standards for the
current RC drilling programme. These CRMs include the AMIS 0031, AMIS 0118 and
the AMIS 0119. The CRM AMIS 0031 and AMIS 0118 were made using the ore coming
from the Lonshi Copper Mine in the DRC, while the CRM AMIS 0119 was made using
the ore coming from the Kansanshi Mine in Zambia.
Good performance was observed from the analyses as most of the samples results
are situated within the two standard deviation limits for the first CRM AMIS
0031 while very few analyses from the two other standards (AMIS0018 and 0119)
were situated only just outside the negative standard deviation limits.
Considering the deviation level of 95% as reported on the CRM certificates,
these results are all within acceptable limits.
However, among the three CRM used for the QAQC analysis, only one has Co
values reported on the certificates; therefore, the analysis of the Co
performance was done only for the AMIS 0119 made from the sulphide ore sourced
from the Kansanshi Project.
Analyses of AMIS 0119 performed very well and apart from one statistically
insignificant outlier, are all situated within the two required standard
deviation limits.
ALS inserted the following nine certified reference materials CCU-1e, EMOG-17,
GBM306-12, GBM908-10, MRGeo08, OREAS 905, OREAS 100a, OREAS134b and AMIS 0090
as lab standards for its internal quality analysis and control. Minex analysed
the performance of five of the nine CRMs used by ALS to conduct the comparison
with the performance learned from the CRM inserted by Minex.
The analysis of the CRM CCU-1e which was made from copper concentrate from the
Flin Flon mill, Manitoba, Canada, shows that the copper values as obtained by
ALS are situated within the acceptable standard deviation limits. Analysis of
the values as received from the laboratory for the CRM GBM306-12 indicates
that they are situated well with the 2 standard deviation limits.
For the CRMs GBM908-10 and OREAS905, a few samples are situated a short
distance beyond the 95% standards tolerance limits for both copper and cobalt,
although this may reflect the fact that the matrices do not match those of the
typical Copperbelt CRMs.
Field duplicates were inserted in all the batches sent to both the preparation
and analytical laboratories. The pulp duplicate samples inserted into the
Luanshimba batches collected from the RC Drilling program were also analysed.
The figures below show the results of the duplicate for the RC sampling data.
In total, 138 duplicates samples were submitted for analysis, this being
approximately 5% of the total sample stream.
The duplicate samples show a very strong correlation with the mother samples,
with a correlation coefficient of 0.9788 for the analysis of the Cu content
and this shows that the sample preparation precision is excellent. For Co,
there was an excellent correlation between the mother sample and its duplicate
with a correlation coefficient of 0.9919.
The analytical laboratory duplicated some of the samples from the batches
submitted for analysis as control tools for their internal QC process. 176
samples were duplicated and reported from the analysis certificates. The
duplicate samples show a very strong correlation with their mother samples,
namely, R2 of 0.9981 for Cu and 0.9919 for Co; this shows that the sample
preparation precision is excellent.
Blank samples were inserted into the RC Drilling sampling batches that were
sent to the ALS laboratory for analysis. AMIS 0415 used were made from silica
chips and was acquired from AMIS.
Many Cu values from ALS assays exceeded the standard deviation limits of the
blank, varying between 1.0 and 23 ppm with an average of 5.67 ppm which is
above the upper standard limit of the acceptable deviation. However, they
largely fall below the limit of quantification and thus are statistically not
significant. However, two particular samples gave high values of Cu, with Cu
values of 10ppm and 23ppm respectively. This indicates that there may be
occasional contamination and an internal audit will be carried out in order to
upgrade the internal protocol regarding sample preparation. By contrast, the
blank Co values of the same samples returned values mostly close to the lower
detection limit, well below 5 ppm which is perfectly acceptable.
The technical information in this report has been compiled and reviewed under
the supervision of M. Kazadi S-B. Barry MSc, Pr.Sc.Nat., MGSSA, MSEG, who is a
member of the South African Council for Natural Scientific Professions, and Mr
Stephen Kalbskopf, BSc (Hons), FGSSA, MSEG. Mr. Kazadi and Mr Kalbskopf have
sufficient experience in the style of mineralisation and type of deposit under
consideration. Mr. Kazadi consents to the inclusion in this announcement of
the matters based on his information in the form and context in which it
appears. Mr Kazadi is a Managing Director of Mineral Exploration Associates
SARL, consultants (under the name Minex Consulting) to the Company.
This announcement contains inside information for the purposes of Article 7 of
the Market Abuse Regulation (EU) 596/2014 as it forms part of UK domestic law
by virtue of the European Union (Withdrawal) Act 2018 ("MAR").
Glossary
Argillaceous: clastic sedimentary rock containing silt- or clay-sized particles that are
less than 0.0625 mm and/or clay minerals. The term argillite is used for rocks
which are more indurated than claystone or shale but not metamorphosed to
slate. All these argillaceous rocks are consolidated equivalents of muds,
oozes, silts, and clays.
Arenite: a sedimentary clastic rock with sand grain size between 0.0625 mm (0.00246 in)
and 2 mm (0.08 in), generally formed by erosion
Arkose: a weathered sedimentary sandstone primarily composed of quartz and feldspar
Bornite: a sulphide copper mineral with chemical composition Cu(5)FeS(4)
Breccia: a sedimentary rock composed of broken fragments of minerals or rocks cemented
together by a fine-grained matrix
Clastic: a rock consisting of broken pieces of other rock
Chalcocite: an important sulphide copper mineral with chemical composition Cu(2)S
Chalcopyrite: the most abundant sulphide copper mineral with chemical formula CuFeS
Dolomite: a sedimentary calcium magnesium carbonate rock
Fault gouge: crushed and fragmented rock produced by friction between the two sides of a
moving fault
Heterogenite: a mineral oxide of cobalt, sometimes containing copper and iron
Hypogene: used of processes within the earth's crust
Lower Roan Subgroup: the sediments deposited in a continental rift basin after 880 Ma, that host
the majority of Zambian Copperbelt Cu-Co deposits
Pelitic: a metamorphosed fine-grained sedimentary rock, such as mudstone, siltstone or
shale
Pyrite: the most abundant sulphide mineral, an iron sulphide with chemical composition
FeS(2)
Redox: redox boundary in aquatic sediments is the depth below the sea-floor with
equilibrium between the supply of oxygen by diffusion, and its consumption by
the (mostly biological) oxidation of organic matter
Supergene: used of processes near the earth surface
Syncline: a fold of stratified rock with younger layers closer to the centre in which
the strata slope upwards from the axis
Upper Roan Subgroup: post-rift, shallow marine to lagoonal carbonates with abundant evaporites and
breccias, that host many of the important Cu-Co deposits of the DRC
For further information, please contact:
Andrew Bell 0207 747
9990
Chairman Red Rock Resources Plc
Roland Cornish/ Rosalind Hill Abrahams 0207 628 3396 NOMAD
Beaumont Cornish Limited
Jason Robertson 0207 374
2212
Broker First Equity Limited
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