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Mexico
San Dimas Mine

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 Location:
107 km NE from Mazatlan, Durango, Mexico

  Address:
Domicilio conocido s/n, Tayoltita Centro
San Dimas
Durango, Mexico
34690
Phone  ...  Subscription required
Fax01-(669)-915-9834
EmailEmail
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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
  • Gold
Mining Method
  • Mechanized Cut & Fill
  • Longhole stoping
  • Dry waste backfill
Production Start...
Mine Life2025


Owners

Source: p. 15,30
CompanyInterestOwnership
First Majestic Silver Corp. 100 % Indirect
First Majestic acquired the San Dimas mine in May 2018 with the acquisition of Primero Mining Corp.

The San Dimas Silver Mine is owned and operated by the First Majestic Silver Corp. wholly-owned indirect subsidiary, Primero Empresa Minera S.A. de C.V.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

The vein-hosted mineral deposits within the San Dimas Mine district are considered to be examples of silver- and gold-bearing epithermal quartz veins that formed in a low-sulphidation setting. Epithermal veins are typically localized along structures but may also form in permeable lithologies. Upward-flaring ore zones centred on structurally controlled hydrothermal conduits are typical. Large to small veins and stockworks are common. Vein systems can be laterally extensive, but the associated ore shoots have relatively restricted vertical extent. High-grade ores are commonly form within dilational faults zones near flexures and fault splays. Textures typical of low-sulphidation quartz vein deposits include open-space filling, symmetrical and other layering, crustification, comb structure, colloform banding and complex brecciation.

Within the San Dimas district, the mineralization is typical of epithermal vein structures with banded and drusy textures. Epithermal-style veins occupy east–west-trending fractures, except in the southern part of the Tayoltita Block where they strike mainly northeast, and in the Santa Rita area where they strike north–northwest.

The silver- and gold-rich quartz veins formed in two different phases. The east–west striking veins developed first, followed by a second system of north–northeast-striking veins. Veins pinch and swell and commonly exhibit bifurcation, horse-tailing, and sigmoidal structures. The veins have been follow ........


Mining Methods

  • Mechanized Cut & Fill
  • Longhole stoping
  • Dry waste backfill


Summary:

The San Dimas mine includes five main underground gold and silver mining areas: West Block (San Antonio mine), Sinaloa Graben Block (Graben Block), Central Block, Tayoltita Block, and the Arana Hanging-wall Block (Santa Rita mine). In 2020, 68% of ROM production came from the Central Block, 29% from the Sinaloa Graben and 3% from the Tayoltita Block and other areas.

Access to the mining areas is achieved by adits and internal ramps. The Central Block and Sinaloa Graben rely solely on truck haulage, whereas Tayoltita ROM material is transported to the surface stockpile via rail. Main accesses are typically driven at 5 m wide by 5 m high, with accesses to the stopes at 3 m wide by 3 m high. Typical rail haulageway dimensions are 3.5 m wide by 3.5 m high.

Internal ramps connect stopes from both the hanging wall and foot wall, and often, when two or more veins are in close proximity, single ramps can provide access to multiple veins.

The predominant mining methods at the San Dimas mine are mechanized cut-and-fill and longhole mining. Longhole mining was introduced in 2012 and is becoming increasingly important.

Cut-and-fill mining is carried out using jumbo or jackleg drills and load-haul-dump (LHD) machines. Minimum mining widths of 2.5 m and 0.8 m for jumbo and jackleg mining, respectively, may be attainable. Waste rock is used as fill material and provides both wall support and a working base from which to take subsequent cuts afte ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityProductUnits2022202120202019201820172016
Silver Metal in doré koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required3,6223,9605,320
Gold Metal in doré koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent Metal in doré koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent Payable metal koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Payable metal koz  ......  Subscription required  ......  Subscription required3,618
Gold Equivalent Metal in doré oz  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Tonnes milled  ......  Subscription required  ......  Subscription required691,576 t435,289 t444,711 t759,087 t
Daily milling capacity  ......  Subscription required  ......  Subscription required2,500 t2,500 t
Annual milling rate  ......  Subscription required  ......  Subscription required
Ore tonnes mined  ......  Subscription required  ......  Subscription required437,918 t762,167 t
Daily milling rate  ......  Subscription required  ......  Subscription required1,555 t2,074 t
Subscription required - Subscription is required.

Reserves at December 31, 2021:
Cut-off grade considered to constraint resources assuming an underground operation was 165 g/t Ag-Eq.

CategoryTonnage CommodityGradeContained Metal
Proven 2,328 kt Silver 348 g/t 26,050 koz
Proven 2,328 kt Gold 4.42 g/t 330.8 koz
Proven 2,328 kt Silver Equivalent 697 g/t 52,190 koz
Probable 1,506 kt Silver 265 g/t 12,820 koz
Probable 1,506 kt Gold 3.02 g/t 146.4 koz
Probable 1,506 kt Silver Equivalent 504 g/t 24,390 koz
Proven & Probable 3,834 kt Silver 315 g/t 38,870 koz
Proven & Probable 3,834 kt Gold 3.87 g/t 477.2 koz
Proven & Probable 3,834 kt Silver Equivalent 621 g/t 76,580 koz
Measured 2,546 kt Silver 474 g/t 38,780 koz
Measured 2,546 kt Gold 6.15 g/t 503 koz
Measured 2,546 kt Silver Equivalent 924 g/t 75,640 koz
Indicated 1,906 kt Silver 336 g/t 20,580 koz
Indicated 1,906 kt Gold 3.83 g/t 235 koz
Indicated 1,906 kt Silver Equivalent 616 g/t 37,770 koz
Measured & Indicated 4,452 kt Silver 415 g/t 59,360 koz
Measured & Indicated 4,452 kt Gold 5.15 g/t 737 koz
Measured & Indicated 4,452 kt Silver Equivalent 792 g/t 113,410 koz
Inferred 4,073 kt Silver 310 g/t 40,660 koz
Inferred 4,073 kt Gold 3.54 g/t 463 koz
Inferred 4,073 kt Silver Equivalent 570 g/t 74,630 koz

Commodity Production Costs:

CommodityUnits202220212020201920182017
Total cash costs Silver Equivalent USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total cash costs Silver USD  ......  Subscription required  ......  Subscription required 14.6 / oz  
Total cash costs Gold Equivalent USD 939 / oz  
Total cash costs Silver USD  ......  Subscription required†  ......  Subscription required† 0.11 / oz†  
Total cash costs Gold USD 867 / oz†  
All-in sustaining costs (AISC) Silver Equivalent USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required
All-in sustaining costs (AISC) Silver USD  ......  Subscription required†  ......  Subscription required† 5.92 / oz†  
All-in sustaining costs (AISC) Gold USD 1,216 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2021202020192018
Total operating costs ($/t milled) USD 142127.91131.9117.46

Financials:

Units202120202019201820172016
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 16.8   2.5   11.4  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 20.5   21.8   36.2  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 102.5   91.8   147.6  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 22.7   -312.8   -120.5  
After-tax Income M USD -309   -102  
EBIT M USD -313.9   -122  
Subscription required - Subscription is required



Heavy Mobile Equipment as of December 31, 2020:
HME TypeSizeQuantity
Drill (long hole) 20 m ....................... Subscription required
Jumbo 16 ft ....................... Subscription required
Jumbo 12 ft ....................... Subscription required
Jumbo 14 ft ....................... Subscription required
Load-Haul-Dump (LHD) 1.5 cu. yd ....................... Subscription required
Load-Haul-Dump (LHD) 2 cu. yd ....................... Subscription required
Load-Haul-Dump (LHD) 3 cu. yd ....................... Subscription required
Load-Haul-Dump (LHD) 4 cu. yd ....................... Subscription required
Load-Haul-Dump (LHD) 6 cu. yd ....................... Subscription required
Load-Haul-Dump (LHD) 8 cu. yd ....................... Subscription required
Raise boring rig 6 ft ....................... Subscription required
Raise boring rig 8 ft ....................... Subscription required
Truck (haul) 10 tons ....................... Subscription required
Truck (haul) 15 tons ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 18, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 18, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 18, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 18, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required 2017
Subscription required Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
................................... 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 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Annual Report 2018
Annual Information Form 2017
Form 20-F 2017
Management Discussion & Analysis 2017
Press Release 2017
Press Release 2016
Annual Report 2014
Technical Report 2014
Annual Information Form 2012
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