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Mexico
Cerro Las Minitas Project

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 Location:
6 km N from Guadalupe Victoria, Durango, Mexico

  Project Contacts:
Vallarta No. 3 Interior 3 E Colonia Hidalgo del Parral Centro
Hidalgo del Parral
Chihuahua, Mexico
33800
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Overview

StagePreliminary Economic Assessment
Mine TypeUnderground
Commodities
  • Silver
  • Gold
  • Lead
  • Zinc
  • Copper
Mining Method
  • Longhole open stoping
  • Transverse stoping
  • Longitudinal stoping
  • Paste backfill
  • Backfill
Mine Life15 years (as of Jan 1, 2022)
Cerro Las Minitas is one of the Largest and Highest Grade Undeveloped Silver Projects in the World.

Southern Silver evaluates gold recovery from both sulphide and oxide sources.


Owners

Source: p. 30
CompanyInterestOwnership
Southern Silver Exploration Corp. 100 % Indirect
Cerro Las Minitas Project is 100% owned by Southern Silver.

Southern Silver through its subsidiary Minera Plata del Sur, S.A. de C.V. (“MPS”) acquired a 100% interest in the claims. MPS is now the registered title holder of the claims.

Contractors

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Deposit Type

  • Skarn
  • Manto


Summary:

From 2010-2021 Southern Silver completed programs of geological mapping, surface geochemical sampling and airborne and ground geophysical surveys in support of 80,904 m of core drilling in 186 holes resulting in the delineation of six mineral deposits: the Blind; El Sol, Las Victorias, Skarn Front, South Skarn and Mina La Bocona deposits on the Cerro Las Minitas Property. The Blind, El Sol and Las Victorias deposits comprise multiple sub-vertical northwest-southeast trending zones of semi massive to massive sulphide mineralization. Mineralization is hosted in the skarnoid- and hornfels-altered margins of monzonite and felsite dykes and may be localized along through-going structures or occur as replacements within stratigraphic units. The mineralized zones can be traced for up to 1000 m along strike and up to 800 m down dip. Sulphide mineralization in the Skarn Front deposit is localized at the outer boundary of the skarnoid alteration zone surrounding the Central Monzonite Intrusion at or near the transition to the recrystallized/marbleized carbonate sediments (marmorized zone). The Skarn Front deposit can be traced for up to 1,100 m along strike and up to 1,000 metres depth. Geological modelling suggests that intersections between the sub-vertical, northwest-trending Blind and El Sol mineralized zones and the generally more shallowly dipping Skarn Front may localize higher-grade shoots of mineralization. Drilling in 2020-22 confirmed laterally extensive skarnoid-style mi ........


Mining Methods

  • Longhole open stoping
  • Transverse stoping
  • Longitudinal stoping
  • Paste backfill
  • Backfill


Summary:

The Cerro Las Minitas Project is a deposit that extends from near surface to over one km in depth and ranges in width from approximately 2 m to greater than 20 m. Although some parts of the deposit are near the surface, this deposit has been selected for underground extraction using bulk mining methods. Due to the proximity to an active, albeit a small scale operation, backfill was considered for both longitudinal and transverse stoping methods.

Proposed Mining Methods
Based on the parameters of the deposit, longhole open stoping (LHOS) was selected as the mining method. Two variations of longhole open stoping were considered, depending on the extent and width of the mineralisation. Where the mineralisation is narrower the preferred mining method is longitudinal LHOS, while transverse LHOS is proposed where mineralisation is wider. Both methods are proposed to use paste backfill.

A sublevel spacing of 25 m was selected with a maximum stope strike length of 20 m and maximum widths of approximately 20 m. Due to the size of the excavations, transverse mining will be sequenced bottom-up to minimise backfill failure while longitudinal will be top-down.

Mineralisation Width - 20 m;
Length - 20 m;
Height - 25 m;
Width - 20 m.

UNDERGROUND MINE DESIGN
Due to the distance between the various geological deposits, the project is separated into two separate underground designs. The Cerro Las Minitas Main, the larger of ........


Crushing and Grinding
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Processing

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Summary:

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Projected Production:

CommodityProductUnitsDailyAvg. AnnualLOM
Silver Payable metal koz 70,816
Silver Metal in concentrate koz 5,30079,184
Lead Concentrate kt  ......  Subscription required  ......  Subscription required
Lead Payable metal M lbs  ......  Subscription required
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required
Zinc Payable metal M lbs  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required
Copper Payable metal M lbs  ......  Subscription required
Silver Equivalent Metal in concentrate M oz  ......  Subscription required  ......  Subscription required

Operational Metrics:

Metrics
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Tonnes processed  ......  Subscription required
Daily processing capacity  ......  Subscription required
Annual processing capacity  ......  Subscription required
Mining scale, tpd  ......  Subscription required
Processing scale, tpd  ......  Subscription required
* According to 2022 study.
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Reserves at October 27, 2021:
Mineral Resources at $60 NSR Cut-off.

CategoryOreTypeTonnage CommodityGradeContained Metal
Indicated Sulphide 12,325 kt Silver 106 g/t 42,100 koz
Indicated Oxide 65 kt Silver 28 g/t 58 koz
Indicated Sulphide 12,325 kt Gold 0.07 g/t 28 koz
Indicated Oxide 65 kt Gold 2.2 g/t 4.5 koz
Indicated Sulphide 12,325 kt Lead 1.3 % 358 M lbs
Indicated Sulphide 12,325 kt Zinc 3.3 % 895 M lbs
Indicated Sulphide 12,325 kt Copper 0.16 % 44 M lbs
Indicated Sulphide 12,325 kt Silver Equivalent 347 g/t 137,323 koz
Indicated Sulphide 12,325 kt Zinc Equivalent 8.4 % 2,288 M lbs
Inferred Sulphide 19,605 kt Silver 117 g/t 73,610 koz
Inferred Oxide 219 kt Silver 120 g/t 844 koz
Inferred Sulphide 19,605 kt Gold 0.12 g/t 78 koz
Inferred Oxide 219 kt Gold 0.8 g/t 5.6 koz
Inferred Sulphide 19,605 kt Lead 1.2 % 500 M lbs
Inferred Sulphide 19,605 kt Zinc 2.3 % 1,009 M lbs
Inferred Sulphide 19,605 kt Copper 0.23 % 98 M lbs
Inferred Sulphide 19,605 kt Silver Equivalent 314 g/t 197,712 koz
Inferred Sulphide 19,605 kt Zinc Equivalent 7.6 % 3,295 M lbs

Commodity Production Costs:

CommodityUnitsAverage
All-in sustaining costs (AISC) Silver Equivalent USD  ......  Subscription required&nbs
All-in sustaining costs (sold) Silver Equivalent USD  ......  Subscription required&nbs
Assumed price Lead USD  ......  Subscription required&nbs
Assumed price Zinc USD  ......  Subscription required&nbs
Assumed price Copper USD  ......  Subscription required&nbs
Assumed price Silver USD  ......  Subscription required&nbs
* According to 2022 study / presentation.
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Operating Costs:

Units2022
UG mining costs ($/t milled) USD 38.7 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2022 study.
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2022 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 369.6
Refining costs $M USD  ......  Subscription required
G&A costs $M USD 87.8
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net Operating Income (LOM) $M USD  ......  Subscription required
Net Income (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax NPV @ 10% $M USD  ......  Subscription required
Pre-tax NPV @ 8% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
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Water Supply
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Proposed Heavy Mobile Equipment as of August 29, 2022:
HME TypeModelSizeQuantity
Drill ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 29, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 29, 2022
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Other 2022
Preliminary Economic Assessment 2022
Press Release 2022
Press Release 2022
Subscription required - Subscription is required.

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