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Mexico
Cusi Mine (Cusi Mine Expansion Project)

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 Location:
86 km SW from Chihuahua, Chihuahua, Mexico

  Regional Office:
Blas Cano de los RĂ­os No. 500, Col. San Felipe
Chihuahua
Chihuahua, Mexico
31203
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Silver
  • Lead
  • Zinc
  • Gold
Mining Method
  • Bench & Fill
  • Sub-level caving
  • Room-and-pillar
  • Backfill
Production Start...
Mine Life16 years (as of Jan 1, 2020)


Owners

Source: p. 39
CompanyInterestOwnership
Sierra Metals Inc. 100 % Indirect
Dia Bras Mexicana SA de CV (operator) 100 % Direct
Dia Bras Mexicana is a wholly-owned subsidiary of Sierra Metals.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Epithermal


Summary:

Mineralization at the Cusi Mine has been variously described as a) low-sulfidation epithermal (Ciesielski, 2007), b) high-sulfidation epithermal (SGS, 2008) and linked epithermal-base metal system (Meinhert, 2006). Meinhert (2006) notes that although shallow (<100 m) historic mining is reported to have encountered grades exceeding 1,000 oz/ton Ag, the veins currently exposed are more base-metal rich than would be expected in an epithermal system. However, Sierra Metals geologists consider the abundance of base metals on the property to be primarily a function of depth of exposure and SRK agrees with this interpretation. Mineralization occurs along narrow fractures containing quartz, sphalerite and galena, and wall rock alteration consists primarily of silicification and the development of clays and iron oxides. The veins contain quartz with crustiform and banded textures typical of epithermal systems.

The property lies within a possible caldera that contains a prominent rhyolite body interpreted as a resurgent dome. The rhyolite dome trends northwest-southeast with an exposure of roughly 7 km by 3 km and hosts mineralization. It is bounded (cut) on the east side by strands of the NWtrending Cusi fault and on the west by the Border fault. The Cusi fault has both normal and rightlateral strike-slip senses of shear. Strands of the Cusi fault are intersected by NE-trending faults, some of which indicate left-lateral strike-slip shear. NE-trending veins associated with ........


Mining Methods

  • Bench & Fill
  • Sub-level caving
  • Room-and-pillar
  • Backfill


Summary:

Current production at Cusi comes from the Promontorio and Santa Rosa de Lima mineralized zones.

Each mine area is accessed from a spiral ramp (4 meters square), as well as a single shaft in each area. Minimal development is needed to exploit mineralized zones, and contract miners are developing ramps at both mines to exploit ores at depth.

Mineralized material is currently hauled to the surface using one of several adits or declines accessing the mineralized zones, and is then dumped onto small pads outside of the portals.

The mining sequence through this method is of a descending type, that is, the upper levels are mined, while in the lower ones the necessary preparations are made to start mining once the mineralized material has been extracted from the upper stopes. Within a sublevel, mining is carried out in retreat, starting at the ends of the stope and retreating towards the entrance.

Bench and Fill
In veins less than 3 m wide, sublevels are vertically spaced 16 m, and the access drift is 4 m x 4 m. Blastholes are vertically drilled 8.5 m thus leaving a sill pillar of 3.5 m under the overlying stope.

In veins wider than 3 m but less than 5, sublevels are vertically spaced 16 m, and the access drift is 4 m x 4 m. Blastholes are vertically drilled 8.5 m thus leaving a sill pillar of 3.5 m under the overlying stope.

Room and Pillars
Where veins are wider than 5 m, levels are spaced every 16 m and ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnits2022202120202019201820172016
Silver Equivalent Metal in concentrate koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required8135491,103
Silver Metal in concentrate koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate k lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Metal in concentrate oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent Payable metal koz  ......  Subscription required  ......  Subscription required  ......  Subscription required812
Zinc Metal in concentrate k lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Tonnes processed  ......  Subscription required  ......  Subscription required285,236 t186,889 t88,011 t186,898 t
Daily processing capacity  ......  Subscription required  ......  Subscription required1,200 t938 t650 t600 t
Daily processing rate  ......  Subscription required  ......  Subscription required815 t534 t251 t534 t
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Reserves at December 31, 2021:

CategoryTonnage CommodityGradeContained Metal
Measured 647 kt Silver 230 g/t 5 M oz
Measured 647 kt Lead 0.24 % 3 M lbs
Measured 647 kt Zinc 0.29 % 4 M lbs
Measured 647 kt Gold 0.02 g/t
Measured 647 kt Silver Equivalent 247 g/t 5 M oz
Indicated 4,303 kt Silver 177 g/t 24 M oz
Indicated 4,303 kt Lead 0.55 % 52 M lbs
Indicated 4,303 kt Zinc 0.64 % 61 M lbs
Indicated 4,303 kt Gold 0.13 g/t 18 koz
Indicated 4,303 kt Silver Equivalent 219 g/t 30 M oz
Measured & Indicated 4,951 kt Silver 184 g/t 29 M oz
Measured & Indicated 4,951 kt Lead 0.51 % 56 M lbs
Measured & Indicated 4,951 kt Zinc 0.6 % 64 M lbs
Measured & Indicated 4,951 kt Gold 0.11 % 18 koz
Measured & Indicated 4,951 kt Silver Equivalent 223 g/t 35 M oz
Inferred 4,893 kt Silver 146 g/t 11 M oz
Inferred 4,893 kt Lead 0.43 % 46 M lbs
Inferred 4,893 kt Zinc 0.69 % 74 M lbs
Inferred 4,893 kt Gold 0.18 g/t 28 koz
Inferred 4,893 kt Silver Equivalent 188 g/t 30 M oz

Commodity Production Costs:

CommodityUnits202220212020201920182017
Cash costs (sold) Silver Equivalent USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 15.7 / oz   15.4 / oz  
All-in sustaining costs (sold) Silver Equivalent USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 22.1 / oz   33.9 / oz  
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operating Costs:

Units2021202020192018201720162015
Total operating costs ($/t milled) USD 70.365.363.664.38748.838.9

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 2.1   5.3   4.4  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 10   17.3   5.6  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 11.3   6   12.6  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1.5   -2.5   5.3  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -1.2  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 2.8   -1.4   6.4  
Subscription required - Subscription is required



Heavy Mobile Equipment as of August 31, 2020:
HME TypeModelSizeQuantity
Bolter ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Loader (FEL) ....................... Subscription required
Loader (mini) ....................... Subscription required
Scoop Tram ....................... Subscription required 6 cu. yd ....................... Subscription required
Scoop Tram ....................... Subscription required 3.5 cu. yd ....................... Subscription required
Scoop Tram ....................... Subscription required 6 cu. yd ....................... Subscription required
Truck (service) ....................... Subscription required
Truck (underground) ....................... Subscription required 10 tons ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 5, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 5, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required 2017
Subscription required 2016
Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Corporate Presentation 2018
Press Release 2018
Press Release 2018
Technical Report 2018
Corporate Presentation 2017
Management Discussion & Analysis 2017
Technical Report 2017
Annual Information Form 2016
Corporate Presentation 2016
Management Discussion & Analysis 2016
Annual Information Form 2015
Management Discussion & Analysis 2015
Management Discussion & Analysis 2014
Technical Report 2014
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