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Mexico
Dolores Mine

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 Location:
243 km W from Chihuahua, Chihuahua, Mexico

  Regional Office:
Ave. Ferrocarril No. 99 Piso 1, Local 1 Col. Bellavista
Durango
Durango, Mexico
34047
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 & Underground
Commodities
  • Silver
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Sub-level stoping
  • Cemented backfill
Production Start...
Mine Life2025
Latest NewsPan American Silver reports audited financial results for 2022     February 22, 2023


Owners

Source: p. 86
CompanyInterestOwnership
Pan American Silver Corp. 100 % Indirect
Compañía Minera Dolores, S.A. de C.V. (operator) 100 % Direct
Ownership Tree

Contractors

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Deposit Type

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


Summary:

Dolores is located in the Sierra Madre Occidental volcanic belt, which comprises calc-alkaline batholiths and volcano sedimentary rocks of the Lower Volcanic Series and ignimbrites of the Upper Volcanic Series.

The San Francisco fault and its footwall host most of the mineralization at Dolores. The immediate footwall and hanging wall of the fault forms a 500 metre wide northwest-striking corridor of igneous intrusions.

Low sulphidation epithermal silver and gold mineralization is hosted in north-northwest trending hydrothermal breccias and sheeted vein zones in the order of 5 metres to 10 metres wide. Most high grade mineralization occurs along three major structures. Silver and gold mineralization identified on the surface lies over an area 4,000 metres long and up to 1,000 metres wide.

The highest grade mineralization occurs within the San Francisco Breccia, a well-defined and continuous hydrothermal breccia and stockwork zone that occurs in the immediate footwall of the San Francisco fault. The breccia trends further away from the fault towards the north until it joins a second major breccia zone known as the Alma Maria Breccia.

Hydrothermal breccias carry the highest silver and gold grades and pass outward into vein stock works. The veins are thin, rarely over 30 mm, and tend to occur as sheeted swarms. Economically mineable grades occur where the veins are sufficiently closely spaced.


Mining Methods

  • Truck & Shovel / Loader
  • Sub-level stoping
  • Cemented backfill


Summary:

Mining at Dolores is by standard open pit methods using shovels, loaders, and haul trucks and by underground methods using sub level open stoping and ramp haulage to the surface.

Open pit
The minimum mining unit is 7 m x 14 m x 7.5 m. Ore grade control drilling is carried out using angled reverse circulation 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 vertical span of 30.2 m, equal to four bench heights. The holes pattern is offset with 25% of the holes drilled from each bench to provide full coverage. The reverse circulation drillholes are logged for lithology and oxidation and sampled every 2 m. Ore and waste material is drilled and blasted using 135 mm diameter, 8.5 m deep blast holes spaced 4.5 m along strike and 4.5 m across strike, charged with ammonium nitrate fuel oil (“ANFO”). Ore and waste are usually blasted separately and a blast movement monitoring system is in place to minimize ore loss, dilution, and material misclassification.

The majority of the waste will be stored to the south of the pit. The mining sequence is planned to focus on the higher grade material in the south of the pit with waste material stored in the east was ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2022202120202019201820172016
Silver koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required4,0814,2323,838
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:

Metrics202120202019201820172016
Waste  ......  Subscription required
Tonnes milled  ......  Subscription required  ......  Subscription required6,777 kt6,903 kt6,605 kt6,307 kt
Daily milling rate  ......  Subscription required  ......  Subscription required
Daily milling capacity  ......  Subscription required  ......  Subscription required20,000 t20,000 t20,000 t16,200 t
Annual production capacity  ......  Subscription required  ......  Subscription required7,500 koz of silver metal in doré
Annual production capacity  ......  Subscription required  ......  Subscription required200 koz of gold metal in doré
Subscription required - Subscription is required.

Reserves at June 30, 2021:

CategoryTonnage CommodityGradeContained Metal
Proven 20.8 Mt Silver 22 g/t 14.9 M oz
Proven 20.8 Mt Gold 0.74 g/t 495.3 koz
Probable 6.2 Mt Silver 28 g/t 5.6 M oz
Probable 6.2 Mt Gold 0.78 g/t 155.1 koz
Measured 2.8 Mt Silver 16 g/t 1.5 M oz
Measured 2.8 Mt Gold 0.3 g/t 27.2 koz
Indicated 0.8 Mt Silver 22 g/t 0.6 M oz
Indicated 0.8 Mt Gold 0.62 g/t 16.3 koz
Inferred 2.7 Mt Silver 46 g/t 4 M oz
Inferred 2.7 Mt Gold 1.25 g/t 108.5 koz

Commodity Production Costs:

CommodityUnits202220212020201920182017
Cash costs (sold) Gold USD  ......  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†
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:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 59.5   85.4   113.2  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 48.5   38.4  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 236.8   197.7   189.3  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -34.7  
Pre-tax Income M USD -35.6   -0.5   8.2  
After-tax Income M USD -10.8   11.2   -2.5  
Subscription required - Subscription is required



Heavy Mobile Equipment as of December 31, 2016:
HME TypeModelSizeQuantityLeased or
Contractor
Bulldozer ....................... Subscription required ....................... Subscription required
Bulldozer ....................... Subscription required ....................... Subscription required
Bulldozer ....................... Subscription required ....................... Subscription required Leased
Bulldozer ....................... Subscription required ....................... Subscription required Leased
Dozer (rubber tire) ....................... Subscription required ....................... Subscription required
Drill (blasthole) ....................... Subscription required ....................... Subscription required
Drill (blasthole) ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required Leased
Excavator ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required Leased
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Shovel ....................... Subscription required ....................... Subscription required
Shovel ....................... Subscription required ....................... Subscription required Leased
Truck (haul) ....................... Subscription required 78 t ....................... Subscription required
Truck (haul) ....................... Subscription required 91 t ....................... Subscription required
Truck (haul) ....................... Subscription required 91 t ....................... Subscription required
Truck (haul) ....................... Subscription required 91 t ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 11, 2022
Subscription required - Subscription is required.

Staff:

ContractorsTotal WorkforceYear
Subscription required Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
................................... 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
Subscription required - Subscription is required.

News:

NewsDate
Pan American Silver reports audited financial results for 2022 February 22, 2023

Subscription required - Subscription is required.

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