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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 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
  • Copper
  • Silver
  • Gold
  • Zinc
Mining Method
  • Sub-level stoping
  • Longhole stoping
  • Room-and-pillar
  • Paste backfill
Production Start...
Mine Life7 years (as of Jan 1, 2020)
At the Bolivar mine, growth will be focused around the expansion of plant capacity and the integration tunnel which will link the mine to the mill, creating efficiencies and cost reduction by eliminating truck haulage of ore to the mill. Both projects are planned for completion by the end of Q4 2022.
Latest NewsSierra Metals Reports Q4 and Full Year 2022 Production Results, Reflecting Improved Performance at Its Bolivar Mine     January 27, 2023


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

  • Skarn
  • Breccia pipe / Stockwork
  • Carbonate replacement


Summary:

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 argillaceous laminations. The vertical thickness of this horizon varies considerably in cross-section (108 to 173 m) and this variation is attributed to paleo-topographic relief. The upper contact ........


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:

CommodityProductUnits2022202120202019201820172016
Copper Equivalent Metal in concentrate M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required211821
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 M lbs  ......  Subscription required  ......  Subscription required1918
Zinc Equivalent Payable metal k lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent Metal in concentrate koz  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Tonnes processed  ......  Subscription required  ......  Subscription required1,269,697 t1,031,750 t887,237 t950,398 t
Daily processing capacity  ......  Subscription required  ......  Subscription required5,000 t3,600 t3,000 t3,000 t
Daily processing rate  ......  Subscription required  ......  Subscription required3,628 t2,948 t2,535 t2,715 t
Subscription required - Subscription is required.

Reserves at December 31, 2021:

CategoryTonnage CommodityGradeContained Metal
Indicated 17,915 kt Copper 0.77 % 305 M lbs
Indicated 17,915 kt Silver 15 g/t 9 M oz
Indicated 17,915 kt Gold 0.2 g/t 117 koz
Indicated 17,915 kt Copper Equivalent 1 % 393 M lbs
Inferred 19,950 kt Copper 0.78 % 344 M lbs
Inferred 19,950 kt Silver 14 g/t 9 M oz
Inferred 19,950 kt Gold 0.21 g/t 134 koz
Inferred 19,950 kt Copper Equivalent 1 % 440 M lbs

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Cash costs (sold) Copper Equivalent USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 1.44 / lb   1.49 / lb   1.15 / 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   7.64 / oz  
All-in sustaining costs (sold) Copper Equivalent USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 2.13 / lb   2.68 / lb   2.28 / 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   15.2 / oz  
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operating Costs:

Units2021202020192018201720162015
Total operating costs ($/t milled) USD 3224.329.427.724.924.427.9

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 2   11.1   7.8  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 14.1   15.6   8.2  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 52.5   44.9   33.3  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 8.2   6.1   0.1  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -3.6   -3.2   -6.9  
EBITDA M USD  ......  Subscription required 11   11.9   5.1  
Subscription required - Subscription is required



Heavy Mobile Equipment as of August 31, 2019:
HME TypeModelSizeQuantity
ANFO Loader ....................... Subscription required ....................... Subscription required
Bolter ....................... Subscription required ....................... Subscription required
Drill jumbo (single boom) ....................... Subscription required ....................... Subscription required
Drill jumbo (two boom) ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Scaler ....................... Subscription required ....................... Subscription required
Scoop Tram ....................... Subscription required ....................... Subscription required
Scoop Tram ....................... Subscription required 8 cu. yd ....................... Subscription required
Truck (underground) 14 cu. m ....................... Subscription required
Truck (underground) ....................... Subscription required 30 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 3, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
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 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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News:

NewsDate
Sierra Metals Reports Q4 and Full Year 2022 Production Results, Reflecting Improved Performance at Its Bolivar Mine January 27, 2023

Subscription required - Subscription is required.

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