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Mexico
Nuestra Señora Mine (Cosala Operation)

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 Location:
10 km SE from Cosala, Sinaloa, Mexico

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

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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Silver
  • Zinc
  • Lead
  • Copper
Mining Method
  • Cut & Fill
  • Shrinkage stoping
  • Longhole stoping
Production Start...
Production from the Nuestra Señora mine stopped in early 2018 and the mine is on care and maintenance.


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., Minera Platter River Gold S.A. de R.L. de C.V. and Minera Cosalá S.A. de C.V.

Contractors

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Deposit Type

  • Skarn
  • Carbonate replacement
  • Vein / narrow vein
  • Breccia pipe / Stockwork


Summary:

Mineralization in the Nuestra Señora area includes mineralized calc-silicate skarns, carbonate replacement deposits, veins, and breccia-hosted deposits that occur within limestone and granodiorite. Pb-Zn-Cu-Ag mineralization is primarily associated with variably retrograde-altered garnet-pyroxene exoskarn with lesser mineralization within pyroxene-garnet endoskarn in the Nuestra Señora mine. Within the Nuestra Señora Main Zone, post-skarn brecciation and calcite emplacement appear to be contemporaneous with mineralization, with sulfides occurring as fracture-fill and large “clots” within the calcite-filled breccia matrix.

Pb-Zn-Cu-Ag mineralization at Nuestra Señora is primarily associated with variably retrograde-altered garnet-pyroxene exoskarn (bedded limestone protolith) with lesser mineralization within pyroxenegarnet endoskarn. In general, exoskarn mineralization occurs within preferential horizons in the general stratigraphy which strikes northwest and dips to the northeast 30-50o. Thrust faulting sub-parallel to bedding has been proposed to create more favorable fluid pathways and localize mineralization.

Within the Nuestra Señora Main Zone, post-skarn brecciation and calcite emplacement appear to be contemporaneous with mineralization, with sulfides occurring as fracture-fill and large “clots” (up to 10cm across) within the calcite-filled breccia matrix. The breccia texture can be coarse with clasts greater than one meter in width. Though ther ........


Mining Methods

  • Cut & Fill
  • Shrinkage stoping
  • Longhole stoping


Summary:

In December 2017, the Nuestra Señora mine was placed on care andmaintenance. Production from the Nuestra Señora mine has stopped although a resource remains at the property.

Nuestra Señora underground mine development commenced in 2005, and prior to the commissioning of the process plant in May 2008, approximately 87,000 tonnes of ore had been stockpiled on surface. Since attaining commercial production of the process plant in January 2009, the Nuestra Señora mine has been the sole source of ore feed for the plant. Mining at Nuestra Señora uses mechanized mobile mining equipment, principally twin-boom jumbos, 6yd3 scoop trams, production drill rigs, and rigidbody highway trucks.

Complex geometries of the mineralized bodies make it imperative to employ high-density definition drilling techniques to determine the extents of the mineralization. During development, ore-control definition is performed by drilling 12m long holes on approximately 4m centers. Samples are taken from the cuttings of each 1.5m of drill steel and are assayed in the operation’s laboratory. This detailed sampling control allows for more appropriate development, improving mining recovery and minimizing dilution.

As successive levels are developed, each mineralized body is tested for continuity and size. The mining method employed for each mineralized body is determined by its geometry. Predominantly long-hole or cut-and-fill stoping is designed for production; however, sh ........


Crushing and Grinding


Processing

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Summary:

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Production:

CommodityUnits201620152014
Silver oz 1,006,1191,162,2901,177,639
Zinc lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent oz  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate.

Operational Metrics:

Metrics201620152014
Tonnes milled 500,509 t506,148 t536,336 t
Daily milling capacity 1,600 t1,600 t

Reserves at June 30, 2020:
Mineral Resources are estimated at a 90g/tonne silver equivalent cut-off grade at Nuestra Señora.

The Mineral Resources as at 30th June 2021 at Nuestra Señora are unchanged from June 30, 2020.

CategoryTonnage CommodityGradeContained Metal
Measured 257 kt Silver 85 g/t 700 koz
Measured 257 kt Zinc 1.76 % 10 M lbs
Measured 257 kt Lead 0.84 % 4.8 M lbs
Measured 257 kt Copper 0.16 % 0.9 M lbs
Indicated 1,879 kt Silver 89 g/t 5,379 koz
Indicated 1,879 kt Zinc 1.74 % 71.9 M lbs
Indicated 1,879 kt Lead 0.82 % 33.9 M lbs
Indicated 1,879 kt Copper 0.2 % 8.2 M lbs
Measured & Indicated 2,136 kt Silver 89 g/t 6,079 koz
Measured & Indicated 2,136 kt Zinc 1.74 % 81.9 M lbs
Measured & Indicated 2,136 kt Lead 0.82 % 38.7 M lbs
Measured & Indicated 2,136 kt Copper 0.19 % 9.2 M lbs
Inferred 2,009 kt Silver 101 g/t 6,539 koz
Inferred 2,009 kt Zinc 1.9 % 84.3 M lbs
Inferred 2,009 kt Lead 0.83 % 37 M lbs
Inferred 2,009 kt Copper 0.26 % 11.3 M lbs

Commodity Production Costs:

CommodityUnits20162015
Total cash costs Silver USD 7.79 / oz†   10.8 / oz†  
All-in costs Silver USD 9.31 / oz†   14.9 / oz†  
† Net of By-Product.



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 3, 2022
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
Annual Information Form 2017
Year-end Mineral Reserves 2017
Annual Information Form 2016
Annual Information Form 2015
Annual Report 2015
Preliminary Economic Assessment 2012
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