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Mexico
EC120 (El Cajon & Zone 120) Project (Cosala Operation)

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 Location:
9 km NE from Cosala, Sinaloa, Mexico

  Project Contacts:
Belisario Domínguez No. 29 a Cosalá cruzar las comunidades de la Estancia y los Braceros
Cosalá
Sinaloa, Mexico
80700
Phone  ...  Subscription required
Fax01(696)-965-0956
EmailEmail
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StagePre-Feasibility
Mine TypeUnderground
Commodities
  • Silver
  • Copper
  • Gold
Mining Method
  • Post Pillar Cut & Fill
  • Overhand Cut & Fill
  • Backfill
Mine Life5 years (as of Jan 1, 2019)
The EC120 project is a part of Cosalá operations. EC120 includes both El Cajón Mine and Zone 120 deposits.

Processing of material from EC120 is expected to start after the cessation of production from San Rafael.


Owners

Source: p. 34
CompanyInterestOwnership
Americas Gold and Silver Corp. 100 % Indirect
The Cosalá Operations is 100% owned and operated by Americas’ wholly owned subsidiaries, Platte River Gold Inc. (“Platte River Gold”), Minera Platter River Gold S.A. de R.L. de C.V. (“Minera Platte”) and Minera Cosalá S.A. de C.V. (“Minera Cosalá”).
The property consists of 67 mining concessions covering a total area of 19,391ha. These concessions and fractional concessions are 100% owned by Americas’ subsidiaries Minera Platte and Minera Cosalá.

Contractors

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Deposit Type

  • Skarn


Summary:

Zone 120 in the eastern portion of the San Rafael deposit contains silver-copper mineralization within garnet-pyroxene-calcite skarn. The strong metasomatic alteration and the close spatial relationship with a large dioritic intrusion suggest that Zone 120 represents a proximal skarn deposit. El Cajón is a proximal silver-copper skarn related to an adjacent nearly cylindrical diorite intrusive body. Mineralization at El Cajón is replacement type and occurs as horizons in recrystallized limestone which are connected by mineralized zones localized by steeply dipping contacts, faults and fractures.

Zone 120 occurs not as a single horizon, but as multiple bedding- and intrusive-contact-related mineralized horizons. As currently defined, the Zone 120 mineralization occurs within a rock volume that is approximately 600m long, 250m wide and extends to a depth of about 350m below the surface. It strikes in a direction of 330°, and below the massive sulphide, the bedding-related mineralization dips steeply to the northeast at approximately 50°. The Zone 120 mineralization is interpreted to occur along near-vertical contacts between diorite and skarn-altered lime rich volcarenites in the lower parts, and in quartz-sericite-pyrite-altered volc-arenites in the upper portions. The quartz altered material is now referred to as hornfels, differing from earlier interpretations. Hornfels seems to be developed in carbonate poor rocks whereas the more highly mineralized skarn is deve ........


Mining Methods

  • Post Pillar Cut & Fill
  • Overhand Cut & Fill
  • Backfill


Summary:

The EC120 project is a part of Cosalá operations. EC120 includes both El Cajón Mine and Zone 120 deposits.

The EC120 Project considers underground mining at both the El Cajón and Zone 120 deposits. These deposits are located approximately 1.5km from each other on surface and limited portions of the Mineral Resources underground, are as close as 600m.

The El Cajón underground mine is accessed by an existing decline that portals at surface near the El Cajón administration building. The Zone 120 underground mine will be accessed from the existing development at the San Rafael mine, which is accessed by an existing decline that portals at surface near the San Rafael surface infrastructure. Access to the stoping areas at the EC120 Project is provided by primary ramp and lateral access development. Ramp development is limited to a maximum gradient, both positive and negative, of 15% to allow mobile equipment to work efficiently.

The El Cajon mine decline development continues from the existing main decline to access the stoping areas defined by the Mineral Reserves. There are two main stoping areas in the mine that are both accessed from the same decline. The ventilation system consists of a series of vertical raises developed both conventionally and by a raise bore. The RB-01 bored raise is approximately 84m and the RB-02 bored raise is approximately 161m.

The Zone 120 mine ramp access extends from an area near the existing Upper Zone in ........


Crushing and Grinding


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Silver Payable metal koz 12,023
Silver Metal in concentrate koz 2,50012,524
Copper Payable metal M lbs  ......  Subscription required
Copper Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required
Copper Concentrate kt  ......  Subscription required
Silver Equivalent Payable metal koz  ......  Subscription required

Operational Metrics:

Metrics
Ore tonnes mined, LOM 2,877 kt *
Tonnes milled, LOM 2,877 kt *
* According to 2019 study.

Reserves at June 30, 2021:
Mineral Resources and Mineral Reserves are estimated at a net smelter return (“NSR”) cut-off value of $45/tonne at El Cajón, $45/tonne at Zone 120

CategoryTonnage CommodityGradeContained Metal
Probable 2,878 kt Silver 157.2 g/t 14,549 koz
Probable 2,878 kt Copper 0.42 % 26.5 M lbs
Indicated 2,313 kt Silver 105.1 g/t 7,813 koz
Indicated 2,313 kt Copper 0.28 % 14.1 M lbs
Inferred 597 kt Silver 104.2 g/t 2,000 koz
Inferred 597 kt Copper 0.23 % 3.1 M lbs

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Silver USD  ......  Subscription required&nbs
All-in sustaining costs (AISC) Silver USD  ......  Subscription required&nbs
Assumed price Copper USD  ......  Subscription required&nbs
Assumed price Silver USD  ......  Subscription required&nbs
* According to 2019 study / presentation.

Operating Costs:

Units2019
UG mining costs ($/t mined) USD 18.1 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2019 study.
Subscription required - Subscription is required.

2019 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 36.2
Refining and transportation $M USD  ......  Subscription required
G&A costs $M USD 28.4
Total OpEx $M USD  ......  Subscription required
Mining Taxes $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net revenue (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 @ 7.5% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
After-tax NPV @ 7.5% $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
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of April 3, 2019:
HME TypeModelSizeQuantity
Backhoe ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 25, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Year-end Mineral Reserves 2017
Annual Information Form 2016
Preliminary Economic Assessment 2013
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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