REG - Great Southrn.Copper - Further "exceptional" assay results from Mostaza
07/04/2025 07:00
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RNS Number : 8896D Great Southern Copper PLC 07 April 2025
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07 April 2025
Great Southern Copper plc
("GSC" or the "Company")
Hole DD007 Intersects High-Grade Copper and Silver with Grades up to 16.15% Cu
and 646 g/t Ag
Exploration holes confirm extension of high-grade system south of Mostaza,
Cerro Negro
Great Southern Copper plc (LSE: GSCU), the company focused on
copper-gold-silver exploration in Chile, is pleased to report further
exceptional assay results from Phase I drilling at the Mostaza Mine, Cerro
Negro.
Highlights:
· Assay results received for diamond drill hole CNG25 DD007 with
significant intervals including;
Ø 33m of 1.96% Cu and 60.6 g/t Ag from 87m, including
§ 3.85m of 5.21% Cu and 318.2 g/t Ag from 88m, and
§ 5.0m of 5.90% Cu and 99.2 g/t Ag, from 115m, including
· 2.5m of 9.67% Cu and 175.4 g/t Ag from 116.4m
· New results include highest reported assay grades of 16.15% Cu and
646 g/t Ag with four samples reporting copper assay grades over 8.0% Cu
· DD007 located 270m to the south of CNG25 DD001 which intersected;
Ø 20m of 3.31% Cu and 269.9g/t Ag from 27m(1)
· Mineralisation remains open in all directions including at depth
· Phase II resource and exploration diamond drilling in progress with a
further 10 holes completed for 1,059m
· GSC holds an option to own 100% of the Cerro Negro project which
includes the Mostaza mine
· Prospect located at low elevation with excellent access to
infrastructure and mining services
· Recent funding round and the ongoing exercising of warrants provide a
strong balance sheet for continuing exploration at Mostaza and the greater
licence areas
Sam Garrett, Chief Executive Officer of Great Southern Copper, said: "The
results for hole DD007 confirm that high-grade copper-silver mineralisation is
continuing along trend south of the Mostaza mine which greatly enhances the
potential value of this significant copper-silver deposit. The 16.15% copper
result is the highest assay result received to date for the project.
"Phase II diamond drilling is well under-way with two rigs now in the Mostaza
pit testing the depth extensions of the high-grade mineralisation identified
in Phase I. To date all Phase II holes have intersected the mineralised lens
to a vertical depth of 100m below the original hole 1 intercept.
"Excitement is building at Cerro Negro, but we have a lot of work ahead of us
as we seek to demonstrate the size and economic value of this exciting
high-grade deposit."
Results of diamond drillholes CNG25 DD006 - DD009
Diamond drillholes CNG25 DD006 - DD009 were designed to test extensions of the
Mostaza Lens 2 mineralisation along trend to the south where discontinuous
outcrops of silicified structurally-controlled mineralisation are mapped as
Lenses 3 - 5 (Figure 1). Small-scale artisanal mining of these southern lenses
is evident, however, no historical details of tonnages or grades have been
previously reported.
All drill holes intersected zones of variably mineralised,
structurally-controlled silicification over varying widths and significant
assays are summarised in Table 1. Holes DD006, 008 and 009 all intersected
shallow oxidised zones of lens with anomalous silver (>0.1 g/t Ag)
associated with the oxidised silicious breccias indicating surface leaching of
sulphides. Geological interpretation of the results are on-going.
Drillhole CNG25 DD006 was drilled to test below and along strike to the north
of Lens 4. It intercepted several oxidised and reduced grade silicified
mineralised zones of "proto-lens" with anomalous Cu and Ag up to 0.16% and
24.9 g/t respectively. (Figure 2)
Drillhole CNG25 DD007 was drilled below Lens 3 and intersected 33m of
mineralised "lens" rock grading 1.96% Cu and 60.56 g/t Ag over the total
intercept from 87m down-hole. The mineralised lens includes two distinct zones
of high-grade Cu-Ag mineralisation including 3.9m at 5.21% Cu and 318.21 g/t
Ag from 88m and 5.0m of 5.90% Cu and 99.2g/t Ag from 115m. The lower zone of
high-grade Cu-Ag includes 2.5m at 9.67% Cu and 175.44 g/t Ag from 116m depth
(see Figure 2). This interval includes the highest reported assay grades to
date of 16.15% Cu and 646 g/t Ag with 4 samples reporting grades over 8.0% Cu.
The mineralised Lens comprises silica-altered breccia clasts within a
sulphide-rich matrix containing abundant chalcopyrite, bornite and pyrite (See
Figure 3). The highest grades correlate with zones of semi-massive
bornite-chalcopyrite mineralisation.
Drillhole CNG25 DD008 was drilled above and 20m to the north of DD007 to
intersect the Lens 3 at a shallower depth. The hole intercepted a 21.4m zone
of oxidised silicified breccia from surface with strong oxidised sulphides and
anomalous Cu and Ag up to 0.51% Cu and 31.3 g/t Ag respectively. These results
suggest that near-surface leaching has resulted in lower grades (Figure 3).
Drillhole CNG25 DD009 was drilled 100m to the south of the Mostaza Mine to
test the southern extension of Lens 2 and intersected several zones of weakly
altered and mineralised "proto-lens", suggesting the Lens has been
structurally displaced in this location.
A summary of all Phase I significant assay results to date are shown in Table
1 below.
Hole_ID From (m) To (m) Interval (m) Cu (%) Ag (g/t) Sb (ppm)
CNG25 DD001 27 47 20 3.31 269.9 934
inc 31 38 7 5.72 489.6 1085
inc 35 38 3 6.62 562.7 407
CNG25 DD002 38.9 43.1 4.2 1.73 126.5 824
CNG25 DD003 36.6 55.2 18.6 1.85 146.6 798
inc 39 52 13 2.48 198.1 1049
inc 48 51 3 3.31 254.7 1608
inc 50 51 1 4.64 406 2150
CNG25 DD004 no significant intercepts
CNG25 DD005 35 56 21 2.9 246.7 978
inc 37 52 15 3.79 328.4 1252
inc 40 52 12 4.24 369.5 1279
inc 45 52 7 5.08 449.6 1309
inc 45 47 2 6.05 547.5 645
CNG25 DD006 132.54 132.91 0.46 0.08 24.9 5.48
CNG25 DD007 87 120 33 1.96 60.6
inc 88 91.85 3.85 5.21 318
and 115 120 5 5.59 99.2
inc 116.4 118.9 2.5 9.67 175.4
CNG25 DD008 0 1.2 1.2 0.512 31.3 28
0 31 31 7.1
inc 8 22 14 9.6
CNG25 DD009 no significant intercept
Table 1: Summary of significant intercepts for Phase I GSC drill holes DD001 -
DD009.
The Mostaza Cu-Ag deposit, Cerro Negro
The high-grade Cu-Ag mineralisation at Mostaza is confined to a north-south
trending, structurally-controlled lode, or "lens" (specifically Lens 2), of
variable width (<4-20m) that dips moderately steeply to the west.
Copper-silver mineralisation comprises abundant disseminations, veinlets,
crackle networks, and breccia matrix fillings of hypogene black to dark
metallic grey chalcocite with lesser bluish bornite and traces of chalcopyrite
and pyrite
Host rocks to mineralisation comprise multiple generations of intensely
altered breccia, tuffisite, and felsic intrusive. The mineralised lens is
bounded to the east and west by faults that are typically invaded by narrow
(<1-2m) andesite to rhyolite dykes. Outside of the bounding dykes and
faults, the enclosing wall rocks consist of an east-dipping bedded sequence of
fresh, black volcanic lava flows and brecciated dacite that might be part of a
large dome-diatreme complex outcropping to the east.
The high-grade Cu-Ag mineralogy type and associated advanced argillic style
alteration suggests the lodes at Mostaza are part of a high-sulphidation
epithermal system, potentially related to a yet-to-be-discovered porphyry
style deposit occurring at depth.
The Lens 2 mineralisation is interpreted to form one of a number of Cu-Ag rich
bodies mapped at surface which have historically been interpreted as discrete
"lenses" but which collectively have the potential to make up an anastomosing
network of structurally controlled zones of mineralisation continuous over a
strike length of greater than 1-2km.
Figure 1: Cerro Negro Project, Mostaza Mine: Simplified schematic plan map
showing the location of GSC drillholes with respect to known mineralised
lenses and historical drillholes. Holes reported in this press release are
highlighted in yellow.
Figure 2: Cerro Negro Project: Schematic cross section through drillholes
CNG25 DD006 and DD007 showing Cu-Ag intercepts and the preliminary geological
interpretation and relationship to
historical drillholes. Note the extrapolations to the historical drillholes
are based on assay results only because historical drill core and logs are
unavailable.
Figure 3: Cerro Negro Project, Mostaza Mine. Photograph of core from hole
CNG25 DD007 on the left and CNG25 DD008 on the right, with grades of Cu % and
Ag g/t. The black, brown and bronze minerals filling the cracks and veins in
hole DD007 are Cu-Ag bearing sulphides and sulfosalt minerals cutting
intensely silicified rock. The core from hole DD008 is texturally similar but
has been subject to near-surface oxidation and leaching leaving only Fe-oxides
and clays with low grades of Cu and Ag.
Core preparation, sampling and assaying
The Mostaza diamond drill core is collected from site by GSC staff and
transported to the Company's nearby sampling facilities where it is then
processed for geological, geotechnical, petrophysical and geochemical data.
Sampling intervals are selected principally on geologic boundaries and may
vary in length up to 2m. The core is cut into two halves using an electric
diamond brick saw with half-core samples each allocated a unique identifier
code and bagged-tagged separately. Samples for each complete hole are
transported by GSC personnel to ALS laboratories in Santiago, Chile for sample
preparation (drying, weighing, crushing and grinding). A final 200g aliquot of
each sample is forwarded by ALS to their laboratories in Lima, Peru where it
is assayed for Au (by 30g fire assay with ICP-AES finish method) plus a suite
of 48 base metals and trace elements including Cu and Molybdenum (by four acid
digest ICP-MS method).
Sampling and assaying QAQC protocols employed by the company for this drilling
project include routine insertion of standard reference materials including
standards and blanks. Results for each SRM are assessed to monitor the
accuracy and precision of the assay data from ALS for the core samples.
Next steps
Phase II diamond drilling at Mostaza commenced on 11 March 2025 employing two
rigs and is designed to include resource and exploration drilling. To date a
further 10 holes have been drilled for the Phase II programme for a total of
1,059 metres. Within the Mostaza pit the Phase II drilling continues to
intersect the high-grade Lens 2 mineralisation down to 100m below the DD001
intercept with mineralisation remaining open in all directions.
Metallurgical studies of drill core, stockpiles and tailings are also in
planning stage. Extensions of mineralisation at depth and along trend under
cover may also be targeted with geophysical surveys.
HOLE SAMPLE ID FROM (m) TO LONG (m) LITHOLOGY Cu % Ag g/t Sb ppm
(m)
CN25-DDH006 937159 0 2 2 Black Breccia 0.003 0.03 6.33
CN25-DDH006 937160 2 4 2 0.004 0.04 7.47
CN25-DDH006 937161 4 6.2 2.2 0.006 0.11 10.85
CN25-DDH006 937162 6.2 7 0.8 0.024 0.45 2.61
CN25-DDH006 937163 7 8 1 0.007 0.1 3.82
CN25-DDH006 937164 8 10 2 0.011 0.16 3.21
CN25-DDH006 937165 10 12 2 0.012 0.13 3.43
CN25-DDH006 937166 12 14 2 Coarse Feldspar Porphyry 0.009 0.09 3.66
CN25-DDH006 937167 14 16 2 0.013 0.21 4.68
CN25-DDH006 937168 16 18 2 0.014 0.49 5.62
CN25-DDH006 937170 18 20 2 0.015 0.2 5.12
CN25-DDH006 937171 20 22 2 0.010 0.1 5.21
CN25-DDH006 937172 22 24 2 0.012 0.09 3.86
CN25-DDH006 937173 24 26 2 0.010 0.08 5.17
CN25-DDH006 937174 26 28 2 0.012 0.07 4.39
CN25-DDH006 937175 28 30 2 0.014 0.07 4.34
CN25-DDH006 937176 30 32 2 0.013 0.04 4.98
CN25-DDH006 937177 32 34 2 0.026 0.06 4.98
CN25-DDH006 937179 34 35.3 1.3 0.041 0.09 4.7
CN25-DDH006 937180 35.3 36.3 1 0.027 0.04 5.51
CN25-DDH006 937181 36.3 37.3 1 0.068 0.08 47.3
CN25-DDH006 937182 37.3 38.3 1 Proto-Lens 4 0.159 0.16 108
CN25-DDH006 937183 38.3 39 0.7 0.057 0.1 48
CN25-DDH006 937185 39 40 1 0.038 0.18 24
CN25-DDH006 937186 40 41.1 1.1 0.024 0.11 8.89
CN25-DDH006 937187 41.1 42.1 1 Black Breccia 0.010 0.15 8.36
CN25-DDH006 937188 42.1 43.1 1 0.046 1.18 35.4
CN25-DDH006 937189 43.1 44 0.9 0.002 0.03 1.82
CN25-DDH006 937190 44 45 1 0.002 0.03 2.11
CN25-DDH006 937192 45 46 1 0.001 0.02 2.62
CN25-DDH006 937193 46 47 1 0.002 0.06 3.02
CN25-DDH006 937194 47 48 1 0.002 0.07 3.23
CN25-DDH006 937195 48 49 1 0.002 0.13 2.31
CN25-DDH006 937196 49 50 1 Proto-Lens in breccia 0.002 0.1 2.21
CN25-DDH006 937197 50 51 1 0.002 0.05 2.18
CN25-DDH006 937198 51 52 1 0.004 0.08 2.42
CN25-DDH006 937199 52 53 1 0.001 0.03 2.21
CN25-DDH006 937200 53 54 1 0.003 0.05 2.26
CN25-DDH006 937202 54 55 1 Black Breccia 0.007 0.17 2.54
CN25-DDH006 937203 55 56 1 0.001 0.03 3.6
CN25-DDH006 937204 56 57 1 0.001 0.03 5.29
CN25-DDH006 937205 57 58 1 0.001 0.04 7.06
CN25-DDH006 937206 58 59 1 0.001 0.02 5.54
CN25-DDH006 937207 59 60 1 0.001 0.02 7.05
CN25-DDH006 937208 60 61 1 0.000 0.02 4.72
CN25-DDH006 937209 61 62 1 0.001 0.02 9.63
CN25-DDH006 937210 62 63 1 0.001 0.02 10.65
CN25-DDH006 937212 63 64 1 0.000 0.02 4.46
CN25-DDH006 937213 64 65 1 0.001 0.01 6.06
CN25-DDH006 937214 65 66 1 0.001 0.04 6.75
CN25-DDH006 937215 66 67 1 0.012 1.1 6.73
CN25-DDH006 937216 67 68 1 0.005 0.25 5.82
CN25-DDH006 937217 68 69 1 0.000 0.01 6.22
CN25-DDH006 937218 69 69.6 0.6 0.001 0.05 5.62
CN25-DDH006 937219 78 80 2 Pink Breccia 0.001 0.08 16.6
CN25-DDH006 937220 88 90 2 0.001 0.01 12.1
CN25-DDH006 937221 98 100 2 0.002 0.01 15.8
CN25-DDH006 937222 108 110 2 Black Breccia 0.001 0.01 10.1
CN25-DDH006 937223 118 120 2 0.001 0.01 3.12
CN25-DDH006 937225 128 130 2 0.000 0.05 5.01
CN25-DDH006 937226 138 140 2 0.000 0.01 2.49
CN25-DDH006 937227 148 150 2 0.000 0.01 1.34
CN25-DDH006 937228 158 160 2 0.000 0.02 1.59
CN25-DDH006 937229 168 170 2 Dacite Dome 0.000 0.01 5.02
CN25-DDH006 937230 178 180 2 0.000 <0.01 6.3
CN25-DDH006 937231 188 190 2 Altered Dacite Dome 0.000 0.01 6.65
CN25-DDH006 937232 198 200 2 0.000 0.01 5.89
CN25-DDH006 937233 208 210 2 0.000 <0.01 5.96
CN25-DDH006 937234 218 220.3 2.3 0.000 0.02 4.13
CN25-DDH006 937235 132.54 132.91 0.37 Proto-Lens 0.080 24.9 5.48
HOLE SAMPLE ID FROM (m) TO LONG (m) LITHOLOGY Cu % Ag g/t Sb ppm
(m)
CN25-DDH007 937236 0 2 2 Black Breccia 0.031 0.23 13.85
CN25-DDH007 937237 2 4 2 0.082 0.07 9.51
CN25-DDH007 937238 4 6 2 0.122 0.14 7.79
CN25-DDH007 937239 8 10 2 0.046 0.07 16.3
CN25-DDH007 937240 21 23 2 0.141 8.42 15.8
CN25-DDH007 937241 32 34 2 0.008 0.48 15.45
CN25-DDH007 937242 36 38 2 Dacite Dyke 0.008 0.2 3.06
CN25-DDH007 937243 56 58 2 0.006 0.15 2.13
CN25-DDH007 937244 68.4 70 1.6 Proto-Lens 0.004 0.16 5.38
CN25-DDH007 937245 82 84 2 Dacite Dyke 0.019 0.41 2.51
CN25-DDH007 937247 85 86 1 0.027 0.65 3.37
CN25-DDH007 937248 86 87 1 Black Breccia 0.153 4.7 27.4
CN25-DDH007 937249 87 88 1 Lens Halo 0.709 37.4 9.62
CN25-DDH007 937250 88 89.2 1.2 8.890 410 6.03
CN25-DDH007 937251 89.2 90.4 1.2 0.259 13.8 26.5
CN25-DDH007 937252 90.4 91 0.6 Lens 8.310 646 8.14
CN25-DDH007 937253 91 91.85 0.85 4.830 387 226
CN25-DDH007 937255 91.85 93 1.15 0.401 14.9 85.1
CN25-DDH007 937256 93 94 1 0.260 5.92 9.39
CN25-DDH007 937257 94 95 1 0.243 4.11 9.4
CN25-DDH007 937258 95 96 1 0.236 3.31 10.1
CN25-DDH007 992659 96 97 1 0.559 4.84 13.65
CN25-DDH007 992660 97 98 1 0.579 5.71 37.8
CN25-DDH007 992661 98 99 1 0.359 6.72 139
CN25-DDH007 992662 99 100 1 0.537 9.41 18.05
CN25-DDH007 992663 100 101.2 1.2 0.236 5.47 10.3
CN25-DDH007 992664 101.2 102 0.8 0.027 1.15 5.67
CN25-DDH007 992666 102 103 1 1.425 23.8 7.82
CN25-DDH007 992667 103 104.9 1.9 0.932 24.7 6.91
CN25-DDH007 992668 104.9 105 0.1 0.222 9.1 7.92
CN25-DDH007 992669 105 106.6 1.6 0.248 5 8.59
CN25-DDH007 992670 106.6 107 0.4 2.210 33.2 12
CN25-DDH007 992671 107 108.1 1.1 1.960 27 10.25
CN25-DDH007 992672 108.1 109 0.9 0.444 3.15 15.7
CN25-DDH007 992673 109 110 1 0.687 5.35 16.15
CN25-DDH007 992674 110 111 1 0.581 5.35 17.6
CN25-DDH007 992675 111 112 1 0.807 6.1 134
CN25-DDH007 992676 112 113 1 1.720 15.1 1445
CN25-DDH007 992677 113 114.1 1.1 0.789 5.94 86.7
CN25-DDH007 992679 114.1 115 0.9 0.741 12.6 9.49
CN25-DDH007 992680 115 116.4 1.4 1.825 22.2 533
CN25-DDH007 992681 116.4 117 0.6 16.150 287 203
CN25-DDH007 992682 117 118 1 9.690 179 13.15
CN25-DDH007 992683 118 118.9 0.9 5.340 97.1 13.35
CN25-DDH007 992684 118.9 119.3 0.4 1.195 23.4 77
CN25-DDH007 992685 119.3 120 0.7 1.010 24.3 350
CN25-DDH007 992687 120 121 1 Coarse Feldspar Porphyry 0.055 4.14 43.2
CN25-DDH007 992688 131 133 2 Black Breccia 0.008 0.18 4.03
CN25-DDH007 992689 139 139.6 0.6 0.019 1.34 4.38
HOLE SAMPLE ID FROM (m) TO LONG (m) LITHOLOGY Cu % Ag g/t Sb ppm
(m)
CN25-DDH008 992690 0 1.2 1.2 Black Breccia 0.512 31.3 28
CN25-DDH008 992691 1.2 2.2 1 0.162 3.74 4.12
CN25-DDH008 992692 2.2 3.2 1 0.157 4.34 5.89
CN25-DDH008 992694 3.2 4.2 1 0.096 2.85 21.9
CN25-DDH008 992695 4.2 5 0.8 Lens 3 0.063 3.45 47.3
CN25-DDH008 992696 5 6 1 0.012 7.23 14.5
CN25-DDH008 992697 6 7 1 0.009 3.57 11.9
CN25-DDH008 992698 7 8 1 0.010 5.12 11.85
CN25-DDH008 992699 8 9 1 0.026 8.13 13.8
CN25-DDH008 992701 9 10 1 0.010 4.48 11.8
CN25-DDH008 992702 10 11 1 0.014 5.81 11.55
CN25-DDH008 992703 11 12 1 0.020 10.15 13.8
CN25-DDH008 992704 12 13 1 0.019 15.35 11.45
CN25-DDH008 992705 13 14 1 0.010 7.1 15.7
CN25-DDH008 992706 14 15 1 0.026 12.35 15.45
CN25-DDH008 992707 15 16 1 0.006 6.08 19.15
CN25-DDH008 992708 16 17 1 0.007 13.25 21.5
CN25-DDH008 992709 17 18 1 0.005 9.97 10.4
CN25-DDH008 992710 18 19 1 0.039 15.5 12.7
CN25-DDH008 992712 19 20 1 0.008 9.4 8.64
CN25-DDH008 992713 20 21 1 0.007 8.48 16.5
CN25-DDH008 992714 21 22 1 0.008 8.67 20.1
CN25-DDH008 992715 22 23 1 0.004 2.62 8.67
CN25-DDH008 992716 23 24 1 0.004 2.62 7.56
CN25-DDH008 992717 24 25.6 1.6 0.022 3.62 7.42
CN25-DDH008 992718 25.6 27 1.4 Lens Halo 0.035 2.12 6.54
CN25-DDH008 992719 27 28 1 0.052 1.14 6.77
CN25-DDH008 992720 28 29 1 0.051 0.95 3.72
CN25-DDH008 992721 29 30 1 0.091 1.1 2.95
CN25-DDH008 992723 30 31 1 0.097 1.1 5.79
CN25-DDH008 992724 31 31.6 0.6 0.193 0.72 5.25
CN25-DDH008 992725 39 40.6 1.6 Black Breccia 0.002 0.1 3.14
HOLE SAMPLE ID FROM (m) TO (m) LONG (m) LITHOLOGY Cu % Ag g/t Sb ppm
CN25-DDH009 992726 0 2 2 Black Breccia 0.083 4.15 27.5
CN25-DDH009 992727 2 4 2 0.064 2.11 12.7
CN25-DDH009 992728 4 6 2 0.072 2.07 15.35
CN25-DDH009 992729 6 8 2 0.039 0.78 12.95
CN25-DDH009 992730 8 10 2 0.025 0.82 18.6
CN25-DDH009 992731 10 11.6 1.6 0.022 0.47 8.26
CN25-DDH009 992732 11.6 14 2.4 Proto-Lens? 0.006 0.33 7.09
CN25-DDH009 992733 14 16 2 0.020 1.42 13.05
CN25-DDH009 992734 16 18 2 0.010 2.48 7.5
CN25-DDH009 992735 18 19.2 1.2 0.016 1.38 12.95
CN25-DDH009 992736 19.2 21 1.8 Black Breccia 0.033 0.88 10.45
CN25-DDH009 992738 21 23.4 2.4 0.011 0.54 6.41
CN25-DDH009 992739 23.4 24 0.6 0.004 0.18 5.25
CN25-DDH009 992740 24 26 2 0.007 0.22 8.31
CN25-DDH009 992741 26 28 2 0.001 0.1 4.77
CN25-DDH009 992742 28 30 2 0.001 0.13 4.84
CN25-DDH009 992743 30 32 2 0.002 0.44 5.96
CN25-DDH009 992744 32 34 2 0.002 0.11 7
CN25-DDH009 992745 34 36 2 0.002 0.15 7.2
CN25-DDH009 992746 36 38 2 0.002 0.84 5.9
CN25-DDH009 992747 38 39.1 1.1 0.002 0.08 6.54
CN25-DDH009 992748 39.1 40 0.9 0.001 0.05 5.4
CN25-DDH009 992749 40 42.3 2.3 0.001 0.05 5.5
CN25-DDH009 992750 42.3 43.3 1 0.001 0.02 4.69
CN25-DDH009 992751 43.3 44 0.7 0.002 0.13 6.76
CN25-DDH009 992752 44.3 45 0.7 Proto-Lens 2 0.013 1.39 28
CN25-DDH009 992754 45 46 1 0.010 0.48 13.35
CN25-DDH009 992755 46 47 1 0.011 1.14 12.3
CN25-DDH009 992756 47 48 1 0.011 0.36 13.75
CN25-DDH009 992757 48 49 1 0.008 0.21 11.55
CN25-DDH009 992758 49 50 1 0.005 0.08 7.76
CN25-DDH009 992650 50 51 1 0.017 0.43 20.7
CN25-DDH009 992651 51 52 1 0.005 0.06 8.39
CN25-DDH009 992653 52 52.9 0.9 0.004 0.15 7.86
CN25-DDH009 992654 52.9 53.65 0.75 0.002 0.22 6.88
CN25-DDH009 992655 53.65 54.4 0.75 0.001 0.01 4.19
CN25-DDH009 992656 54.4 55 0.6 0.001 0.01 36.3
CN25-DDH009 992657 55 56 1 0.012 0.7 14.15
CN25-DDH009 992658 56 56.9 0.9 0.070 2.89 15.7
CN25-DDH009 995259 56.9 58 1.1 Red Breccia 0.002 0.03 32.4
CN25-DDH009 995260 58 59 1 0.001 0.02 17.55
CN25-DDH009 995261 67 69 2 0.002 0.05 33.1
CN25-DDH009 995262 77 79 2 0.001 0.03 16.8
CN25-DDH009 995263 87 89 2 0.002 0.01 28.8
CN25-DDH009 995264 97 99 2 0.002 0.02 11.05
CN25-DDH009 995266 107.3 108.3 1 0.003 0.03 16.35
CN25-DDH009 995267 108.3 109.3 1 0.002 0.07 27.6
CN25-DDH009 995268 109.3 110 0.7 Proto-Lens 2 0.001 0.02 90.3
CN25-DDH009 995269 110 110.4 0.4 0.001 0.02 101.5
CN25-DDH009 995271 110.4 111 0.6 0.001 0.04 72.9
CN25-DDH009 995272 111 112 1 0.001 0.03 90.1
CN25-DDH009 995273 112 113 1 0.005 0.05 130.5
CN25-DDH009 995274 113 114 1 0.004 0.05 76.1
CN25-DDH009 995276 114 115 1 Andesite Dyke 0.007 0.08 40.5
CN25-DDH009 995277 115 117 2 Red Breccia 0.000 0.01 6.08
CN25-DDH009 995278 124 124.7 0.7 0.002 0.06 66.4
Table 2: Cerro Negro Project, Mostaza Mine; Mostaza drill core assay results
for Cu, Ag and Sb, CNG25 DD006 - DD009.
Cautionary note:
The Company cautions that all references to "resources", "mineral resources",
or "mineral resource estimates" in this RNS are historical and were prepared
and reported prior to the implementation of the JORC code and therefore are
non-JORC compliant. The Company advises that the resource categories used in
the historical estimates, for example "measured, indicated, demonstrated and
inferred", may not have the same meaning or degree of confidence as current
JORC categories. Historical records indicate that the quoted non-JORC
resources were calculated using the polygonal method based on underground
sampling, 1024m of drilling in 25 holes, and geological cross-sections and
level plans. GSC is presenting this information for historical context only
and is not treating it as a current mineral resource estimate. The Company has
not been able to independently verify the results of historical drilling or
mine channel samples. References to mineralised grade intervals in drill holes
are considered apparent thicknesses as there is not sufficient geological
information to calculate true thickness of mineralised intercepts at this
time.
References:
1. RNS 5182Y (26 February 2025): Cerro Negro assays
return 20m of 3.3% Cu & 270g/t Ag
Enquiries:
Great Southern Copper plc
Sam Garrett, Chief Executive Officer +44 (0) 20 4582 3500
SI Capital Limited
Nick Emerson +44 (0) 1483 413500
BlytheRay
Tim Blythe / Megan Ray +44 (0) 20 7138 3204
GSC@blytheray.com
Notes for Editors:
About Great Southern Copper
Great Southern Copper PLC is a UK-listed mineral exploration company focused
on the discovery of copper-gold-silver deposits in Chile. The Company has the
option to acquire rights to 100% of two projects in the under-explored coastal
belt of Chile that are prospective for large scale copper-gold deposits. Chile
is a globally significant mining jurisdiction being the world's largest copper
producer and the second-largest producer of lithium.
The two early-stage Cu-Au projects comprise the Especularita and San Lorenzo
Projects, both located in the coastal metallogenic belt of Chile which hosts
significant copper mines and deposits, including Teck's Carmen de Andacollo
copper mine, and boasts excellent access to infrastructure such as roads,
power and ports. Significant historical small-scale and artisanal workings for
both copper and gold are readily evident in both exploration project areas.
Great Southern Copper is strategically positioned to support the global market
for copper - a critical battery metal in the clean energy transition around
the world. The Company is actively engaged in exploration and evaluation work
programmes targeting both large tonnage, low to medium grade Cu-Au deposits as
well as high-grade Cu-Au deposits.
Further information on the Company is available on the Company's website:
https://gscplc.com (https://gscplc.com)
Competent Person Statement
The information in this announcement that relates to exploration results is
based on and fairly represents information reviewed or compiled by Mr Sam
Garrett, a Competent Person who is a Member of the Australian Institute of
Geoscientists and a Fellow of the Society of Economic Geologists. Mr Garrett
is the CEO and a shareholder of Great Southern Copper PLC. Mr Garrett has
sufficient experience that is relevant to the styles of mineralisation and
types of deposit under consideration and to the activity being undertaken to
qualify as a Competent Person as defined in the 2012 Edition of the
"Australasian Code for Reporting of Exploration Results, Mineral Resources and
Ore Reserves". Mr Garrett has provided his prior written consent to the
inclusion in this announcement of the matters based on information in the form
and context in which it appears.
This announcement includes information that relates to Exploration Results
prepared and first disclosed under the JORC Code (2012) and extracted from the
Company's previous LSE announcements as noted, and the Company's Prospectus
dated 20 December 2021. Copies of these announcements are available from the
LSE Announcements page of the Company's website: www.gscplc.com.
The Company confirms that it is not aware of any new information or data that
materially affects the information included within the Prospectus dated 20
December 2021.
Forward Looking and Cautionary Statements
Some statements in this announcement regarding estimates or future events are
forward-looking statements. They include indications of, and guidance on,
future earnings, cash flow, costs and financial performance. Forward-looking
statements include, but are not limited to, statements preceded by words such
as "planned", "expected", "projected", "estimated", "may", "scheduled",
"intends", "anticipates", "believes", "potential", "predict", "foresee",
"proposed", "aim", "target", "opportunity", "could", "nominal", "conceptual"
and similar expressions. Forward-looking statements, opinions and estimates
included in this report are based on assumptions and contingencies which are
subject to change without notice, as are statements about market and industry
trends, which are based on interpretations of current market conditions.
Forward-looking statements are provided as a general guide only and should not
be relied on as a guarantee of future performance. Forward-looking statements
may be affected by a range of variables that could cause actual results to
differ from estimated or anticipated results and may cause the Company's
actual performance and financial results in future periods to materially
differ from any projections of future performance or results expressed or
implied by such forward-looking statements. So, there can be no assurance that
actual outcomes will not materially differ from these forward-looking
statements.
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