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Mexico
Bolivar Mine (Bolivar Expansion Project)

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 Location:
54 km NE from Choix, Chihuahua, Mexico
  Regional Office:
Blas Cano de los Ríos 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
  • Copper
  • Silver
  • Gold
  • Zinc
Mining Method
  • Sub-level stoping
  • Longhole stoping
  • Room-and-pillar
  • Paste backfill
Production Start...
Mine Life2027
On April 16, 2021, the Company announced the approval by its Board for an investment of $28 million for the construction of a magnetite processing plant at the Bolivar Mine.

Although the Board approved this investment, the construction of the proposed magnetite processing plant has yet to take place and there is no indication that such construction shall take place in the foreseeable future.

Owners

Source: p. 41
CompanyInterestOwnership
Sierra Metals Inc. 100 % Indirect
Dia Bras Mexicana SA de CV (operator) 100 % Direct
Sierra Metals Inc. owns 100% of the Bolivar Mine through Dia Bras Mexicana.

Contractors

Subscription required - Subscription is required.

Deposit Type

  • Skarn
  • Breccia pipe / Stockwork
  • Carbonate replacement

Summary:

The Bolivar Property is located within the Guerrero composite terrane which makes up the bulk of western Mexico and is one of the largest accreted terranes in the North American Cordillera.

The Bolivar deposit is classified as a high-grade Cu-Zn skarn and exhibits many characteristics common to this deposit type (Meinert, 2007). The term skarn refers to coarse-grained calcium or magnesian silicate alteration formed at relatively high temperatures by the replacement of the original rock, which is often carbonate-rich.

Skarn alteration and mineralization at the Bolivar property is hosted primarily in a package of sedimentary rocks that occur as a layer or lens within the LVS (Reynolds, 2008). All sedimentary units have undergone low grade metamorphism. The lowermost sedimentary horizon observed is a dolostone which ranges from 24 m to 40 m in thickness. The lower part of the dolostone horizon is interlayered with siltstone. To the south, progressively less of the sedimentary sequence is cut out by granodioritic intrusive rocks and the dolostone is observed to be underlain by a siltstone horizon. The lower siltstone unconformably overlies the LVS. The dolostone is overlain by a discrete layer of siltstone. The average thickness of this siltstone unit is 12 to 30 m. Horizons of argillaceous dolostone (50 m thick) and argillaceous limestone (9 m thick) are above the siltstone marker layer. The uppermost sedimentary horizon is a limestone with local chert and ........

Mining Methods

  • Sub-level stoping
  • Longhole stoping
  • Room-and-pillar
  • Paste backfill

Summary:

The Bolivar Mine is currently mined by the sub-level stoping and room and pillar methods and the specific method applied to a particular area of the mine is determined by geotechnical constraints, mineralization trends, dimensions and mine production targets.

Current production at Bolivar comes from the El Gallo Inferior, Chimenea 1 and 2 and the Bolivar West mineralized zones. 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 the portals. The mineralized material is then loaded into rigid-frame, over-the-road trucks and hauled on a gravel road approximately 5.1 km south to the Piedras Verdes Mill. As explained in more detail in Section 18, the mine is constructing an underground tunnel that will enable mineralized material to be delivered via underground truck transport to a portal adjacent to the Mill.

Sub-Level Stoping - Bolivar West
The longhole method is applied in the shallow dipping mineralized bodies in Bolivar West. Excavation for longholes with openings of 9.0 m and pillars of 7.0 m x 7.0 m for stope heights between 12.0 m and 15.0 m. From the access ramp, access to the mineralized material is established in the central part of the chamber and the mineral cut begins. A drive is developed within the mineralized material, then the drilling of long holes is carried out and extraction begins. Ramps are established in some cas ........

Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.

Production:

CommodityProductUnits2023202220212020201920182017
Copper Equivalent Metal in concentrate k lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required21,32318,338
Copper Metal in concentrate k lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate koz  ......  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 required  ......  Subscription required
Copper Equivalent Payable metal k lbs  ......  Subscription required  ......  Subscription required19,18317,747
Zinc Equivalent Payable metal k lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent Metal in concentrate koz
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required1,269,697 t1,031,750 t887,237 t
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required5,000 t3,600 t3,000 t
Daily processing rate  ......  Subscription required  ......  Subscription required  ......  Subscription required3,628 t2,948 t2,535 t
Processing scale, tpd  ......  Subscription required  ......  Subscription required  ......  Subscription required
Mining scale, tpd  ......  Subscription required  ......  Subscription required  ......  Subscription required
Daily ore mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required3,500 t
Subscription required - Subscription is required.

Reserves at December 31, 2022:

CategoryTonnage CommodityGradeContained Metal
Indicated 17,444 kt Copper 0.73 % 281 M lbs
Indicated 17,444 kt Silver 14 g/t 8 M oz
Indicated 17,444 kt Gold 0.19 g/t 107 koz
Indicated 17,444 kt Copper Equivalent 0.94 % 362 M lbs
Inferred 19,480 kt Copper 0.75 % 320 M lbs
Inferred 19,480 kt Silver 13 g/t 8 M oz
Inferred 19,480 kt Gold 0.2 g/t 124 koz
Inferred 19,480 kt Zinc
Inferred 19,480 kt Silver Equivalent
Inferred 19,480 kt Copper Equivalent 0.95 % 409 M lbs
Inferred 19,480 kt Zinc Equivalent

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Cash costs (sold) Copper Equivalent USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1.44 / lb   1.49 / lb  
Cash costs (sold) Zinc Equivalent USD  ......  Subscription required  ......  Subscription required 0.63 / lb  
Cash costs (sold) Silver Equivalent USD  ......  Subscription required  ......  Subscription required 7.61 / oz   9.06 / oz  
All-in sustaining costs (AISC) Copper Equivalent USD  ......  Subscription required&nbs
All-in sustaining costs (sold) Copper Equivalent USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 2.13 / lb   2.68 / lb  
All-in sustaining costs (sold) Zinc Equivalent USD  ......  Subscription required  ......  Subscription required 0.94 / lb  
All-in sustaining costs (sold) Silver Equivalent USD  ......  Subscription required  ......  Subscription required 11.3 / oz   16.3 / oz  
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operating Costs:

Units20222021202020192018201720162015
Total operating costs ($/t milled) USD 52.13224.329.427.724.924.427.9

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 2   11.1  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 14.1   15.6  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 52.5   44.9  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 8.2   6.1  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -3.6   -3.2  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 11   11.9  
Subscription required - Subscription is required

Pipelines and Water Supply
Source: Subscription required

- subscription is required.

Heavy Mobile Equipment as of September 21, 2021:
HME TypeModelSizeQuantity
ANFO Loader ....................... Subscription required ....................... Subscription required
ANFO Loader ....................... Subscription required
Bolter ....................... Subscription required ....................... Subscription required
Drill jumbo (single boom) ....................... Subscription required ....................... Subscription required
Drill jumbo (two boom) ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Scaler ....................... Subscription required ....................... Subscription required
Scissor Lift ....................... Subscription required
Scoop Tram ....................... Subscription required ....................... Subscription required
Scoop Tram ....................... Subscription required 8 cu. yd ....................... Subscription required
Truck (haul) 20 t
Truck (haul) ....................... Subscription required 30 t
Truck (underground) 14 cu. m ....................... Subscription required
Truck (underground) ....................... Subscription required 30 t ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 1, 2023
....................... Subscription required ....................... Subscription required Subscription required Jun 1, 2023
....................... Subscription required ....................... Subscription required Subscription required Jun 1, 2023
....................... Subscription required ....................... Subscription required Subscription required Jun 1, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Annual Information Form 2022
Corporate Presentation 2022
Management Discussion & Analysis 2022
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
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Management Discussion & Analysis 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
Corporate Presentation 2016
Management Discussion & Analysis 2016
Press Release 2016
Management Discussion & Analysis 2015
Management Discussion & Analysis 2014
Technical Report 2013
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