Southern Silver Technical Report on CLM Project Provides Increased Silver, Lead and Zinc Mineral Resource Estimates
Southern Silver Technical Report on CLM
Project Provides Increased Silver, Lead and
Zinc Mineral Resource Estimates
Vancouver, British Columbia--(Newsfile Corp. - December 15, 2021) -
Southern Silver Exploration
Corp. (TSXV: SSV) ("Southern")
reported today that it has filed a technical report ("Report") prepared
in accordance with Canadian Securities Administrators' National Instrument 43-101. The Report may be
found under the Company's profile at
www.sedar.com
and on Southern's website,
www.southernsilverexploration.com
.
The Report, dated December 13
th
, 2021, entitled "NI 43-101 Technical Report, Mineral Resource
Estimate for Cerro Las Minitas Project, Durango State, Mexico " was prepared by Garth D. Kirkham,
P.Geo. and Arthur Barnes, P.Eng., FSAIMM, following the guidelines of NI 43-101 and NI 43-101F1.
The updated Mineral Resource estimate features increased sulphide resources from two new mineral
deposits, a small oxide resource in one of the new deposit areas and an update of the previously
reported deposits utilizing new metal pricing and metallurgical recoveries. Resource reporting now
utilizes a Net Smelter Return ("NSR") cut-off and reports average grades on a AgEq, ZnEq and $US/t
NSR basis. The Report supports the disclosure made by the Company in its news release dated
October 27, 2021,
"Southern Silver Increases Mineral Resource at Cerro Las Minitas to:
Indicated 137Mozs AgEq or 2.3Blbs ZnEq: 42.1Mozs Ag, 358Mlbs Pb, and 895Mlbs Zn; and
Inferred 198Mozs AgEq or 3.3Blbs ZnEq: 73.6Mozs Ag, 500Mlbs Pb, and 1,009Mlbs Zn."
There are no material differences in the mineral resources contained in the Report from those disclosed
in the October 27, 2021 news release.
Cerro Las Minitas Resource Model Highlights:
The 2021 update, at a US$60/t NSR cut-off, features:
Indicated Mineral Resources - 137 million ounces silver equivalent or 2.3 billion pounds
zinc equivalent
from
12.3 million tonnes averaging 106g/t Silver, 0.1g/t Gold, 0.2% Copper,
1.3% Lead and 3.3% Zinc (347g/t AgEq; 8.4% ZnEq)
equalling a
US$130/t NSR value,
containing:
42.1 million ounces of silver; 28 thousand ounces of gold; 44 million pounds of copper, 358 million
pounds of lead; and 895 million pounds of zinc.
Inferred Mineral resources - 198 million ounces silver equivalent or 3.3 billion pounds zinc
equivalent
from
19.6 million tonnes averaging 117g/t Silver, 0.1g/t Gold, 0.2% Copper,
1.2% Lead and 2.3% Zinc (314g/t AgEq; 7.6% ZnEq)
equalling a
US$123/t NSR value
containing:
73.6 million ounces of silver; 78 thousand ounces of gold; 98 million pounds of copper, 500 million
pounds of lead; and 1,009 million pounds of zinc (1Blbs Zn).
The new Resource Estimate incorporates an additional 20,991 metres of core drilling completed in
2020-21, updated metal recoveries and pricing and the incorporation of over 1,127 metres of specific
gravity ("SG") measurements.
Table 1: Base-case Sulphide Mineral Resource Estimate for CLM Project Utilizing a US$60/t
NSR cut-off value:
Indicated Resources
Average Grade
Zone
Tonnes
Ag
Au
Pb
Zn
Cu
AgEq
ZnEq
NSR
(Kt)
(g/t)
(g/t)
(%)
(%)
(%)
(g/t)
(%)
(US$/t)
Blind Zone
2,347
97
0.04
1.9
2.1
0.11
295
7.2
108
El Sol Zone
1,154
80
0.04
2.2
2.0
0.09
279
6.8
100
Skarn Front Zone
7,254
108
0.06
0.8
4.2
0.19
383
9.3
140
La Bocona Zone
1,571
132
0.19
2.2
1.6
0.17
302
7.3
136
Total
12,325
106
0.07
1.3
3.3
0.16
347
8.4
130
Inferred Resources
Average Grade
Zone
Tonnes
Ag
Au
Pb
Zn
Cu
AgEq
ZnEq
NSR
(Kt)
(g/t)
(g/t)
(%)
(%)
(%)
(g/t)
(%)
(US$/t)
Blind Zone
1,347
83
0.14
1.4
1.8
0.06
248
6.0
88
El Sol Zone
863
65
0.03
1.8
2.3
0.05
263
6.4
90
Las Victorias Zone
1,083
148
0.66
2.1
2.6
0.14
431
10.5
145
Skarn Front Zone
11,466
115
0.05
0.7
2.7
0.32
318
7.7
126
South Skarn Zone
3,789
140
0.18
2.0
1.3
0.09
309
7.5
130
La Bocona Zone
1,057
106
0.20
1.3
2.2
0.18
293
7.1
117
Total
19,605
117
0.12
1.2
2.3
0.23
314
7.6
123
Indicated Resources
Contained Metal
Zone
Tonnes
Ag TrOz
Au TrOz
Pb
Zn
Cu
AgEq TrOz
ZnEq Lbs
(Kt)
(000's)
(000's)
(Mlbs)
(Mlbs)
(Mlbs)
(000's)
(Mlbs)
Blind Zone
2,347
7,350
3
99
109
5.5
22,291
371
El Sol Zone
1,154
2,956
2
55
51
2.2
10,337
172
Skarn Front Zone
7,254
25,106
14
126
678
30.7
89,421
1,490
La Bocona Zone
1,571
6,688
10
77
56
6.0
15,275
255
Total
12,325
42,100
28
358
895
44
137,323
2,288
Inferred Resources
Contained Metal
Zone
Tonnes
Ag TrOz
Au TrOz
Pb
Zn
Cu
AgEq TrOz
ZnEq Lbs
(Kt)
(000's)
(000's)
(Mlbs)
(Mlbs)
(Mlbs)
(000's)
(Mlbs)
Blind Zone
1,347
3,582
6
40
55
2
10,749
179
El Sol Zone
863
1,816
1
35
43
1
7,283
121
Las Victorias Zone
1,083
5,152
23
51
62
3
15,006
250
Skarn Front Zone
11,466
42,462
18
177
687
80
117,065
1,951
South Skarn Zone
3,789
17,007
22
167
112
7
37,660
628
La Bocona Zone
1,057
3,589
7
30
51
4
9,950
166
Total
19,605
73,610
78
500
1,009
98
197,712
3,295
1)
The current Resource Estimate was prepared by Garth Kirkham, P.Geo., of Kirkham Geosystems Ltd.
2)
All mineral resources have been estimated in accordance with Canadian Institute of Mining and Metallurgy and Petroleum ("CIM") definitions,
as required under National Instrument 43-101 ("NI43-101").
3)
Mineral resources were constrained using continuous mining units demonstrating reasonable prospects of eventual economic extraction.
4)
Silver Equivalents were calculated from the interpolated block values using relative recoveries and prices between the component metals and
silver to determine a final AgEq value. The same methodology was used to calculate the ZnEq value.
5)
Silver Equivalents and NSR$/t values were calculated using average long-term prices of $20/oz. silver, $1,650/oz. gold, $3.25/lb. copper, $1.0/lb.
lead and $1.20/lb. zinc. Metal recoveries, payables and deductions are reported in Table 1.
All prices are stated in $USD.
6)
Mineral resources are not mineral reserves until they have demonstrated economic viability. Mineral resource estimates do not account for a
resource's mineability, selectivity, mining loss, or dilution.
7)
An Inferred Mineral Resource has a lower level of confidence than that applying to an Indicated Mineral Resource and must not be converted to
a Mineral Reserve. It is reasonably expected that the majority of Inferred Mineral Resources could be upgraded to Indicated Mineral Resources
with continued exploration.
8)
All figures are rounded to reflect the relative accuracy of the estimate and therefore numbers may not appear to add precisely.
Oxide Resources
A small oxide resource was identified within the upper 100 metres of surface in the La Bocona zone. The
2021 oxide resources at a US$60/t cut-off are:
An
Indicated Mineral resource
totalling
65,000 tonnes averaging 28g/t Ag and 2.2 g/t Au
equalling a
US$93/t NSR value, containing:
58,000 ounces of silver and 4,500 ounces of gold.
An
Inferred Mineral resource
totalling
219,000 tonnes averaging 120g/t Ag and 0.8g/t Au
equalling a US$88/t NSR value, containing:
844,000 ounces of silver and 5,600 ounces of gold
A 74% silver recovery was utilized in the resource model and was based on acid-leach test work
conducted on samples from the Blind - El Sol zone. Gold recovery has been estimated at 70% for the
purposes of this report. Further metallurgical test work is required to confirm the gold recovery from the
La Bocona oxides.
Table 2: Base-case Oxide Mineral Resource Estimate for CLM Project Utilizing a US$60/t NSR
cut-off value:
Average Grade
Contained Metal
La Bocona
Tonnes
Ag
Au
NSR
Ag TrOz
Au TrOz
(kt)
(g/t)
(g/t)
(US$/t)
(koz)
(koz)
Indicated
65
28
2.2
93
58
4.5
Inferred
219
120
0.8
88
844
5.6
Notes: The $60/t NSR cut-off value was calculated using average long-term prices of $20/oz. silver, $1,650/oz. gold. Base metals were not
recovered in the leach circuit. Metallurgical work from batch test work recovered 74% silver from oxidized composites from the Blind - El Sol zones.
Gold recovery was not assessed and is estimated at 70% for the purposes of this report. This work, along with marketing studies, were used to
decide the NSR cut-off value. All prices are stated in $USD.
Cerro Las Minitas Project Highlights:
The updated NI43-101 Mineral Resource estimate significantly increases the size of the resource
on a tonnage basis by approximately 33%, with most of the increase resulting from the addition
and delineation of the La Bocona and the South Skarn deposits;
The Mineral Resource update features a significant increase in contained silver in both the
indicated and inferred categories which now total
Indicated: 42.1Mozs Silver
and
Inferred: 73.6
Mozs Silver
representing an approximate 38% increase from the 2019 resource estimate;
The new deposits have a much stronger Silver-Lead bias resulting in generally higher overall NSR
values for the South Skarn and the Indicated component of the La Bocona resource estimates
compared to previous resource estimates. Similarly, silver maintains a higher proportion of the
overall metal content of the deposits than in earlier estimates;
Higher grade portions of the new resources are relatively shallow and occur within 300 metres of
surface which could potentially benefit future mining scenarios;
Gold recovery is currently not considered in the sulphide NSR calculation. Further metallurgical
work is planned to assess gold recoveries in both the sulphide and oxidized mineralization;
Mineralization in both the South Skarn and Mina La Bocona deposits remains open at depths
below 500 metres, leaving additional exploration potential. Several other targets remain un-tested
or poorly-tested in the area of the Cerro and will form the basis for further exploration on the project
through 2022;
This new Mineral Resource estimate will now form the basis for a Preliminary Economic
Assessment ("PEA"), which is expected to be completed by Q2 2022; and
Modelled Deposits
Six separate mineral deposits were modelled in the resource estimate, four deposits in 2019 and two in
2021. The Blind, El Sol and Las Victorias deposits form sets of sub-parallel, northwest-trending and
steeply dipping mineralized zones which are traced for over 1300 metres strike and up to 600 metres
depth. The Skarn Front forms beneath the Blind, El Sol and Las Victorias deposits and is localized on
the outer edge of the skarn alteration zone surrounding the Central Monzonite Intrusion and has been
drilled along an approximate 1100 metre strike length and to depths of up to 1000 metres.
Similarly, the South Skarn Zone is localized on the outer edge of the skarn alteration zone surrounding
the Central Monzonite Intrusion, but on the eastern side. The deposit forms a tabular, steeply east-
dipping body that has a strike length of approximately 350m and has been drilled to a depth of 500m.
The Bocona Zone consists of two separate sub-zones - the Bocona Skarn Zone and the Muralla Zone.
The Bocona Skarn Zone is also localized on the outer edge of the skarn alteration zone surrounding the
Central Monzonite Intrusion, but on the North side, wrapping around the Northeastern Margin. The upper
part of the Muralla zone is strongly oxidized and is the basis of the quoted oxide resource.
Mineral Resource Estimate Parameters for the South Skarn and Bocona Zones
The estimate was carried out using separate block models for the Bocona and South Skarn Zones
constrained by 3D wireframes of the individual mineralized zones. The block model is comprised
of an array of blocks measuring 10m x 3m x 10m which are sub-blocked to 0.5m x 0.3m x 0.5m,
with grades for Ag, Au, Cu, Pb and Zn interpolated using Inverse Distance to the Second Power
(ID2) weighting. NSR/t, silver equivalent and zinc equivalent values were subsequently calculated
from the interpolated block grades.
The interpolation was carried out in two passes using progressively larger search radii of 60m x
60m x 30m to a maximum of 100m x 100m x 50m for all zones with the exception of the La Bocona
Skarn zone where the second pass was limited to 60m x 15m x 25m at an orientation of 60
degrees perpendicular to strike and -80 degrees down dip. The first pass was restricted to a
minimum of 2 and a maximum of 12 composites, with a maximum of 4 composites from any one
drill hole (i.e. a minimum of two drill holes required for >4 composites) while the second pass was
more restrictive using a minimum of 3 and a maximum of 9 composites, with a maximum of 3
composites from any one drill hole.
Bulk densities at La Bocona were based on a total of 418 sample interval measurements taken by
Southern field personnel. For each sample interval, sub-samples were taken from each individual
length of core and the weighted average for the sample used. Density values ranged from 1.9 t/m
3
to 4.73 t/m
3
. Bulk densities at Skarn South were based on a total of 387 sample interval
measurements where density values ranged from 1.51 t/m
3
to 4.35 t/m
3
. Density values were
interpolated on a block-by-block basis using an inverse distance to the second power. An average
value of 2.97 t/m3 was assigned to blocks that were not interpolated.
Silver composite values have been capped in order to remove the effects of potential
overestimation due to statistical outliers. The threshold chosen was 700 g/t silver for both La
Bocona and South Skarn. In addition, outlier values for the co-product metals were capped at the
threshold levels of 5 g/t gold, 1.4% copper, 15% lead and 10% zinc at La Bocona and 2.5 g/t gold,
0.5% copper, 15% lead and 8% zinc at South Skarn, respectively.
The mineralized zones were initially defined by Southern personnel and subsequently validated
and refined by KGL. The mineralized wire frames were defined using a combination of geological
constraints and grade boundaries with no minimum mining thickness applied. Intervals that were
not sampled were assigned a zero grade.
For all zones, blocks are classified as Inferred if they are included within 75m of at least one drill
hole intercept. Blocks within 40m of the nearest intercept, and estimated by at least two drill holes
were classified as Indicated. However, an interpreted boundary is the final determination of
indicated and inferred resources in order to remove outlier blocks and the "spotted dog" effect. In
addition, continuous potentially underground mining panels were created to demonstrate
"reasonable prospect of eventual economic extraction."
Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.
Inferred Resources are considered too speculative geologically to have economic considerations
applied to them that would enable them to be classified as Mineral Reserves. An Inferred Mineral
Resource has a lower level of confidence than that applying to an Indicated Mineral Resource and
must not be converted to a Mineral Reserve. It is reasonably expected that the majority of Inferred
Mineral Resources could be upgraded to Indicated Mineral Resources with continued exploration.
NSR Calculation Parameters
The NSR values were calculated using average long-term prices of $20/oz. silver, $1,650/oz. gold,
$3.25/lb. copper, $1.00/lb. lead and $1.20/lb. zinc. Metallurgical test work identified three saleable
concentrates for the Skarn zones and two from the Blind, El Sol and Las Victorias zones (BESS).
NSR values for each concentrate were calculated utilizing the parameters summarized in Table 1
and summed to determine a total NSR value for each block.
Only silver and gold recoveries in dore were considered for the oxide NSR calculations. Gold was
not recovered in the sulphide concentrates and is estimated at 70% in the oxide circuit for the
purposes of this reporting.
All prices are stated in $USD.
Table 3: Variables considered in the NSR calculations for each concentrate.
Sulfides
Oxides
Item
Pb Concentrate
Zn Concentrate
Cu Conc.
Ag-Au leach
Skarn
BESS
Skarn
BESS
Skarn
Pb Recovery
84%
90%
Zn Recovery
95%
78%
Cu Recovery
60%
Ag Recovery
77%
79%
8%
12%
7%
74%
Au Recovery
70%
Payable Metals
Pb, Ag
Pb, Ag
Zn, Ag
Zn, Ag
Cu, Ag
Au, Ag
Concentrate grade,
(primary base metal)
65%
70%
54%
52%
27%
Transport, Treatment,
Penalty charges, $ dmt
230
267
358
364
183
Base metal Concentrate
Grade Deduction
3 units
3 units
8 units
8 units
1 unit
Ag Concentrate
Grade Deduction, g/t
50
50
93
93
Ag Refining charge, $/oz
0.6
0.6
0.4
Base metal
Refining, $/lb
0.107
Ag payable
90%
Qualified Persons
The independent Qualified Persons for the Technical Report are
Garth Kirkham, P.Geo., Principal,
Kirkham Geosystems Ltd and Arthur Barnes P.Eng., FSAIMM, Principal, MPC Metallurgical Process
Consultants Limited, who have reviewed and approved the contents of this release. In accordance with
National Instrument 43-101 Standards of Disclosure for Mineral Projects, Robert Macdonald, P.Geo,
Vice President Exploration, is the Qualified Person for the Company and has validated and approved
the technical and scientific content of this news release.
Risk Factors
Southern Silver is aware this project is subject to the same types of risks that large precious and base
metal projects experience at an early stage of development in Mexico. The Company has engaged
experienced management and specialized consultants to identify, manage and mitigate those risks.
However, the types of risks will change as the project evolves and more information becomes available.
About Southern Silver Exploration Corp.
Southern Silver Exploration Corp. is an exploration and development company with a focus on the
discovery of world-class mineral deposits. Our specific emphasis is the 100% owned Cerro Las Minitas
silver-lead-zinc project located in the heart of Mexico's Faja de Plata, which hosts multiple world-class
mineral deposits such as Penasquito, San Martin, Naica and Pitarrilla. We have assembled a team of
highly experienced technical, operational and transactional professionals to support our exploration
efforts in developing the Cerro Las Minitas project into a premier, high-grade, silver-lead-zinc mine.
The Company's property portfolio also includes the Oro porphyry copper-gold project located in southern
New Mexico, USA, which includes patented land, State leases and BLM mineral claims totalling 22.3 sq.
km. Targeting has been finalized and bonding pending for a 4,000m drill program, designed to test
several copper-molybdenum porphyry and copper-gold skarn targets within a broad quartz-sericite-pyrite
alteration zone, interpreted to overlie an unexposed porphyry centre. Permitting is in the final stages with
drilling expected to commence in Q1, 2022.
On behalf of the Board of Directors
"Lawrence Page"
Lawrence Page, Q.C.
President & Director, Southern Silver Exploration Corp.
For further information, please visit Southern Silver's website at
southernsilverexploration.com
or contact
us at 604.641.2759 or by email at
.
Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the
policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this
release.
This news release may contain forward-looking statements. Forward-looking statements address
future events and conditions and therefore involve inherent risks and uncertainties. Actual results may
differ materially from those currently anticipated in such statements. Factors that could cause actual
results to differ materially from those in forward-looking statements include the timing and receipt of
government and regulatory approvals, and continued availability of capital and financing and general
economic, market or business conditions.
Southern Silver Exploration Corp. does not assume any
obligation to update or revise its forward-looking statements, whether as a result of new information,
future events or otherwise, except to the extent required by applicable law.
To view the source version of this press release, please visit
https://www.newsfilecorp.com/release/107741