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Mexico
Dolores Mine

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 Location:
243 km NWW from Chihuahua, Chihuahua, Mexico

  Regional Office:
Ave. Universidad No. 234, 6th Floor, Col. Lomas del Guadiana
Durango
Durango, Mexico
34110
Phone  ...  Subscription required
Fax+52-618-128-0692
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Silver
  • Gold
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life2024
Currently, the Dolores mine is an open pit silver-gold mine. In 2016 was commenced underground mining and after nearly 6 years of mining the underground operation was put in care and maintenance in April 2022.


Owners

Source: p. 2
CompanyInterestOwnership
Pan American Silver Corp. 100 % Indirect
Compañía Minera Dolores, S.A. de C.V. (operator) 100 % Direct
Pan American has 100% ownership of the Dolores mine and the mining concessions, through its wholly-owned subsidiary Compañía Minera Dolores S.A. de C.V.

Contractors

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Deposit Type

  • Epithermal
  • Vein / narrow vein
  • Breccia pipe / Stockwork


Summary:

Dolores is a low sulphidation epithermal deposit with strong structural control. Northeast-striking faults, perpendicular to the structural grain, locate many mineral deposits in the Sierra Madre Occidental. However, regional controls at Dolores are unclear where mineralized faults are north-northwest striking. There is no transverse structure apparent on geological maps or satellite imagery. The mineralized structures have a typical Sierra Madre, or Laramide, trend, a direction probably inherited from the basement of elongate terranes.

Local structural controls are better understood. Sometime after eruption of the Upper Volcanic Series, there was a northeast-southwest extensional regime, with a component of dextral strike-slip, creating dilation on northwest-striking faults. It also caused local dilational jogs that allowed emplacement of dikes, hydrothermal breccias, and sheeted veins. It is likely that the diorite stock-diatreme complex was the main heat engine that drove the hydrothermal system and provided the source of metals. It may have also been emplaced into a space created by a dilational jog. Geopetal structures and low temperature minerals suggest Dolores developed close to the original surface and has not been strongly eroded.

High silver and gold grades occur over a wide vertical interval at Dolores. This is unusual for most low sulphidation epithermal deposits, which tend to have narrow vertical intervals of high grade.

Litholo ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining at Dolores has been ongoing since 2008 using conventional open pit methods with excavators, shovels, loaders, and haul trucks. Ore grade control drilling is carried out using angled RC drilling to provide closer spaced sample data for a grade control estimate, which is used to mark out the ore and waste mining boundaries. The grade control holes are oriented perpendicular to the strike of the deposit on sections spaced every 15 m along strike and every 10 m to 15 m across strike. Drillholes are approximately 43 m long, which results in a nominal vertical span of 30 m, equal to four bench heights. The drillhole pattern is offset with 25% of the holes drilled from each bench to provide full coverage. The RC drillholes are logged for lithology and oxidation and sampled every 2 m.

Ore and waste material is drilled and blasted using 135 mm diameter holes, using a nominal pattern of 8.5 m deep blast holes spaced 4.5 m along strike and 4.5 m across strike. Explosives used are ANFO. Ore and waste are usually blasted separately, and a blast movement monitoring system is used to manage ore loss, dilution, and material misclassification.

Golder recommended bench heights of 7.5 m with 7.5 m wide catch benches located after each bench for mining areas within 30 m of the surface, and catch benches located each third bench or each 22.5 m vertically for mining areas below 30 m. For pre-split and trim mining, the recommended catch bench width is 9.1 m, with a benc ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityUnits2023202220212020201920182017
Silver koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required4,0814,232
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Daily milling rate  ......  Subscription required  ......  Subscription required
Ore tonnes mined  ......  Subscription required  ......  Subscription required
Waste  ......  Subscription required  ......  Subscription required25,227 kt
Tonnes milled  ......  Subscription required  ......  Subscription required6,429 kt6,777 kt6,903 kt6,605 kt
Daily milling capacity  ......  Subscription required  ......  Subscription required20,000 t20,000 t20,000 t20,000 t
Annual production capacity  ......  Subscription required  ......  Subscription required
Annual production capacity  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at June 30, 2022:
Mineral reserves were estimated using a price of $19 per ounce of silver and $1,600 per ounce of gold.
Mineral resources were estimated using metal prices of $22 per ounce of silver and $1,700 per ounce of gold. Mineral Resources are reported within a final pit outline and above a mineral resource cut-off grade.

CategoryTonnage CommodityGradeContained Metal
Proven 12.9 Mt Silver 21 g/t 8.6 M oz
Proven 12.9 Mt Gold 0.57 g/t 235.4 koz
Probable 4.1 Mt Silver 18 g/t 2.4 M oz
Probable 4.1 Mt Gold 0.6 g/t 77.7 koz
Measured 2.1 Mt Silver 30 g/t 2.1 M oz
Measured 2.1 Mt Gold 0.53 g/t 36.5 koz
Indicated 0.8 Mt Silver 57 g/t 1.5 M oz
Indicated 0.8 Mt Gold 1.13 g/t 29.7 koz
Inferred 2.5 Mt Silver 29 g/t 2.4 M oz
Inferred 2.5 Mt Gold 0.92 g/t 74.4 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Cash costs (sold) Silver USD  ......  Subscription required  ......  Subscription required -1.87 / oz†   -1.65 / oz†  
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
All-in sustaining costs (sold) Silver USD  ......  Subscription required  ......  Subscription required 16.4 / oz†   10 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 59.5   85.4  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 48.5   38.4  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 236.8   197.7  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -34.7  
Pre-tax Income M USD -35.6   -0.5  
After-tax Income M USD -10.8   11.2  
Subscription required - Subscription is required


Water Supply
Source: Subscription required

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Heavy Mobile Equipment as of June 30, 2022:
HME TypeModelSizeQuantity
Bulldozer ....................... Subscription required ....................... Subscription required
Bulldozer ....................... Subscription required ....................... Subscription required
Dozer (rubber tire) ....................... Subscription required ....................... Subscription required
Drill (blasthole) ....................... Subscription required 135 mm ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Loader (FEL) ....................... Subscription required
Shovel ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required 91 t ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required 2021
Subscription required Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
Quarterly Report 2023
Annual Information Form 2022
Annual Report 2022
Sustainability Report 2022
Technical Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Annual Report 2018
Press Release 2018
Year-end Mineral Reserves 2018
Annual Information Form 2017
Annual Report 2017
Annual Information Form 2016
Financial Review 2016
Management Discussion & Analysis 2016
Technical Report 2016
Annual Report 2015
Management Discussion & Analysis 2015
Form 40-F 2014
Preliminary Economic Assessment 2014
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