Southern Silver Provides Mineral Resource Update That Includes Newly Identified Shallow High-Grade Deposit at the Cerro Las Minitas Project Mineral Resource Update: Indicated 140Mozs AgEq or 2.3Blbs ZnEq: 42.7Mozs Ag, 364Mlbs Pb, and 903Mlbs Zn; and
Southern Silver Provides Mineral Resource
Update That Includes Newly Identified Shallow
High-Grade Deposit at the Cerro Las Minitas
Project
Mineral Resource Update:
Indicated 140Mozs AgEq or 2.3Blbs ZnEq: 42.7Mozs Ag, 364Mlbs Pb, and 903Mlbs Zn; and
Inferred 210Mozs AgEq or 3.5Blbs ZnEq: 80.0Mozs Ag, 571Mlbs Pb, and 1,029Mlbs Zn
Vancouver, British Columbia--(Newsfile Corp. - March 22, 2023) -
Southern Silver Exploration Corp.
(TSXV: SSV) ("Southern")
reports that Kirkham Geosystems Ltd. has completed an update of its
independent Mineral Resource Estimate ("MRE") on the
Cerro Las Minitas
project in Durango State,
Mexico. The updated MRE significantly expands sulphide resources in the La Bocona deposit through
the incorporation of the North Felsite zone into the resource model. The revised estimate utilizes the
same metal pricing and metallurgical recoveries as the previous 2021 MRE, utilizes a Net Smelter
Return ("NSR") cut-off, as detailed in Table 1, and reports average grades on a AgEq, ZnEq and $US/t
NSR basis. The Mineral Resource estimates for the South Skarn, Blind-El Sol Skarn Front and Las
Victorias deposits and the small oxide resource initially estimated in 2021, remains unchanged in this
current update.
The newly modelled mineral resources represent an approximate 63% increase in the size of the La
Bocona deposit (on a AgEq basis) and an overall 4.5% increase in the mineral resources of the entire
project.
The now extended La Bocona deposit projects laterally along the eastern margin of the central intrusion
and together with the previously identified South Skarn deposit forms a 1,200 metre long, semi-
continuous zone of mineralization featuring three separate higher-grade "shoots" which project to 500m
below surface and remain open at depth for further resource expansion (Figure 1).
Vice President of Exploration, Rob Macdonald stated "
This latest resource update represents one
more step in the continued evolution of the Cerro La Minitas project through the identification of
further shallow, high-grade mineralization which is accretive to the existing mineral resources on the
property and adjacent to the planned project infrastructure. Future work will maintain a focus on adding
value to the project early in the production time-line for maximum economic benefit. This includes:
further engineering upgrades to the project design; a detailed review of the capital expenditures; the
addition of gold payables to the cash-flow model; and pre-concentration to improve the project
economics. Mineralization remains open at depth, particularly on the eastern side of the Cerro which
with further exploration can continue to add high margin mineralization early in the production
scenario."
Figure 1: South Skarn and La Bocona deposits looking southwest at NSR = US$60/t, US$90/t
and US$150/t cut-offs. Mineralization now extends over 1200m along strike on the east side of
the Cerro.
To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/5344/159445_2624497704ba48a8_002full.jpg
Resource Model Highlights:
Compared to the 2021 Mineral Resource estimate, the 2023 update, at a US$60/t NSR cut-off, features:
Indicated Mineral Resources:
A
0.18Mt
increase to
12.5Mt averaging 106g/t Silver, 0.07g/t
Gold, 0.2% Copper, 1.3% Lead and 3.3% Zinc (349g/t AgEq; 8.5% ZnEq)
equalling a
US$130/t NSR value,
containing:
42.7 million ounces of silver; 29 thousand ounces of gold; 46 million pounds of copper, 364 million
pounds of lead; and 903 million pounds of zinc.
This equates to
140 million ounces silver equivalent or 2.3 billion pounds zinc equivalent;
and
Inferred Mineral Resources:
A
1.4Mt
increase to
21.0Mt averaging 118g/t Silver, 0.1g/t Gold,
0.2% Copper, 1.2% Lead and 2.2% Zinc (311g/t AgEq; 7.6% ZnEq)
equalling a
US$123/t
NSR value
containing:
80.0 million ounces of silver; 85 thousand ounces of gold; 101 million pounds of copper, 571 million
pounds of lead; and 1,029 million pounds of zinc (1.03 billion pounds Zn).
This equates to
210 million ounces silver equivalent or 3.5 billion pounds zinc equivalent.
The new Mineral Resource Estimate incorporates results from 26 additional drill holes totalling 11,801.5
metres which tested the north-western extension the La Bocona deposit. Mineralization was also
identified in several holes specifically along the northern margin of the central intrusion that were not
incorporated into the new resource update and with further drilling, represent additional expansion
opportunities.
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.
Gold recovery was not assessed in the sulphide concentrates and as a result was not included in the
NSR calculation. Work is proceeding to determine gold recoveries/payables from the sulphide
concentrates. Results are pending.
All prices are stated in $USD.
Table 1: Variables considered in the NSR calculations for each concentrate.
Sulfides
Item
Pb Concentrate
Zn Concentrate
Cu Conc.
Skarn
BESS
Skarn
BESS
Skarn
Pb Recovery
84%
90%
Zn Recovery
95%
78%
Cu Recovery
60%
Ag Recovery
77%
79%
8%
12%
7%
Au Recovery
Payable Metals
Pb, Ag
Pb, Ag
Zn, Ag
Zn, Ag
Cu, 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 units
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%
Table 2: 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
1,755
130
0.18
2.2
1.7
0.21
326
7.9
136
Total
12,510
106
0.07
1.3
3.3
0.17
349
8.5
130
Inferred Resources
Average Grade
Zone
Tonnes
Ag
Au
Pb
Zn
Cu
AgEq
ZnEq
NSR
(Kt)
(g/t)
(g/t)
(%)
(%)
(%)
(g/t)
(%)
(US$/t)
Blind Zone
1,347
83
0.14
1.4
1.8
0.06
248
6.0
88
El Sol Zone
863
65
0.03
1.8
2.3
0.05
263
6.4
90
Las Victorias Zone
1,083
148
0.66
2.1
2.6
0.14
431
10.5
145
Skarn Front Zone
11,466
115
0.05
0.7
2.7
0.32
318
7.7
126
South Skarn Zone
3,789
140
0.18
2.0
1.3
0.09
309
7.5
130
La Bocona Zone
2,481
125
0.17
1.8
1.3
0.13
285
6.9
120
Total
21,030
118
0.12
1.2
2.2
0.22
311
7.6
123
Indicated Resources
Contained Metal
Zone
Tonnes
Ag TrOz
Au TrOz
Pb
Zn
Cu Lbs
AgEq TrOz
ZnEq Lbs
(Kt)
(000's)
(000's)
(Mlbs)
(Mlbs)
(Mlbs)
(000's)
(Mlbs)
Blind Zone
2,347
7,350
3
99
109
5.5
22,291
371
El Sol Zone
1,154
2,956
2
55
51
2.2
10,337
172
Skarn Front Zone
7,254
25,106
14
126
678
30.7
89,421
1,490
La Bocona Zone
1,755
7,331
10
84
65
8.0
18,406
307
Total
12,510
42,742
29
364
903
46
140,455
2,341
Inferred Resources
Contained Metal
Zone
Tonnes
Ag TrOz
Au TrOz
Pb
Zn
Cu Lbs
AgEq TrOz
ZnEq Lbs
(Kt)
(000's)
(000's)
(Mlbs)
(Mlbs)
(Mlbs)
(000's)
(Mlbs)
Blind Zone
1,347
3,582
6
40
55
2
10,749
179
El Sol Zone
863
1,816
1
35
43
1
7,283
121
Las Victorias Zone
1,083
5,152
23
51
62
3
15,006
250
Skarn Front Zone
11,466
42,462
18
177
687
80
117,065
1,951
South Skarn Zone
3,789
17,007
22
167
112
7
37,660
628
La Bocona Zone
2,481
9,977
14
100
71
7
22,702
378
Total
21,030
79,997
85
571
1,029
101
210,464
3,507
1)
The current Resource Estimate was prepared by Garth Kirkham, P.Geo., of Kirkham Geosystems Ltd.
2)
All mineral resources have been estimated in accordance with Canadian Institute of Mining and Metallurgy and Petroleum ("CIM") definitions,
as required under National Instrument 43-101 ("NI43-101").
3)
Mineral resources were constrained using continuous mining units demonstrating reasonable prospects of eventual economic extraction.
4)
Silver Equivalents were calculated from the interpolated block values using relative recoveries and prices between the component metals and
silver to determine a final AgEq value. The same methodology was used to calculate the ZnEq value.
5)
Silver Equivalents and NSR$/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.
Model Parameters for the Bocona/North Felsite and North Felsite HW Zones
The estimate was carried out using separate block models constrained by 3D wireframes of the
individual mineralized zones. The block model is comprised of an array of blocks measuring 10m x
1m x 10m which are sub-blocked to 1m x 1m x 1m, with grades for Ag, Au, Cu, Pb and Zn
interpolated using Ordinary Kriging within the Bocona/North Felsite zone and Inverse Distance to
the Second Power (ID2) weighting for the North Felsite Hangingwall zones. 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 along strike
and down dip of 60m x 60m to a maximum of 100m x 100m. Composites were restricted to a
minimum of 3 and a maximum of 9 composites, with a maximum of 3 composites from any one drill
hole.
Bulk densities were based on 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 were interpolated on a block-by-block basis
using an inverse distance to the second power. An average value of 2.85 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 the
Bocona/North Felsite and North Felsite HW zones. In addition, outlier values for the co-product
metals were capped at the threshold levels of 1.5 g/t gold, 2% copper, 18% lead and 10% zinc at
Bocona/North Felsite and 2 g/t gold, 0.2% copper, 3% lead and 5% zinc for the North Felsite HW
zones, respectively.
The mineralized zones were initially defined by Southern personnel and subsequently adjusted and
redefined, validated and verified by KGL. The mineralized wire frames were defined using a
combination of geological constraints and grade boundaries in addition to consideration of
potential reasonable mining thickness. Intervals that were not sampled were assigned a zero
grade.
For all zones, blocks are classified as Inferred if they are included within 100m 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.
Qualified Persons
The independent Qualified Person for the mineral resource disclosure for the project is Garth Kirkham,
P.Geo., Principal, Kirkham Geosystems Ltd., who has 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
identification of world-class mineral deposits in major jurisdictions, advancing them either directly or
through joint-venture relationships. Our specific emphasis is on advancing the 100% owned Cerro Las
Minitas project, one of the world's largest undeveloped silver-lead-zinc deposits, to a production
decision.
Southern has assembled a team of highly experienced technical, operational and transactional
professionals to support our efforts in developing (recent robust PEA) the Cerro Las Minitas project into
a premier, high-grade, silver-lead-zinc mine. Our property portfolio also includes the Oro porphyry
copper-gold project and the Hermanas gold-silver vein project where permitting applications for a drilling
is underway; both are located in southern New Mexico, USA.
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.
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