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Mexico
San Dimas Mine

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 Location:
107 km NE from Mazatlan, Durango, Mexico

  Address:
Colonia Tayoltita Centro
San Dimas
Durango, Mexico
34690
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Fax01-(669)-915-9834
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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
San Dimas consists of five ore zones, or blocks: Central, Sinaloa Graben, Tayoltita, Arana Hanging Wall and San Antonio West; and the Tayoltita mil.

San Dimas, one of Mexico’s most important silver and gold mines, is First Majestic’s largest and lowest-cost silver producer and the largest producing underground mine in the state of Durango.


Owners

Source: p. 23,24,41,228
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

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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. Mineralization 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 Favourable Zone concept for San Dimas was developed in the mid seventies in the Tayoltita Block, based on the San Luis vein, which was mined out in the late 1990s. The mine geologists observed that bonanza grades along the San Luis vein were spatially related to the Productive andesite unit and/or to the interphase between the Productive andesite and the Portal rhyolite and/or the Buelna andesite. This spatial association of vein-hosted mineralization to a favorable zone within the volcanic sequence is now recognized in other fault blocks and constitutes a major exploration criterion for the district. The veins were 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. They vary in width from a fraction of a centimeter to as much as 8 m wide, but average 1.5 ........


Mining Methods

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


Summary:

The San Dimas mine includes five 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). Mining activities are conducted by First Majestic and contractor personnel. Two mining methods are currently in use at San Dimas: Cut-and-Fill, and Longhole Stoping.

Cut-and-fill is carried out by either jumbo or jackleg drills, whereas longhole is carried out with pneumatic and electro-hydraulic drills. Primary access is provided by adits and internal ramps.

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. ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityProductUnits2023202220212020201920182017
Silver Metal in doré koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required3,6223,960
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  ......  Subscription required
Silver Equivalent Payable metal koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Payable metal koz  ......  Subscription required  ......  Subscription required3,618
Gold Equivalent Metal in doré oz  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Daily milling rate  ......  Subscription required  ......  Subscription required1,555 t
Daily milling capacity  ......  Subscription required  ......  Subscription required2,500 t2,500 t2,500 t
Ore tonnes mined  ......  Subscription required  ......  Subscription required713,064 t691,576 t435,289 t437,918 t
Tonnes milled  ......  Subscription required  ......  Subscription required713,064 t691,576 t435,289 t444,711 t
Subscription required - Subscription is required.

Reserves at December 31, 2022:
Metal prices considered for Mineral Reserves estimates were $21.50/oz Ag and $1,750/oz Au.

Cut-off grade considered to constraint resources assuming an underground operation was 165 g/t Ag-Eq and was based on actual and budgeted operating and sustaining costs.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 4,311 kt Silver 273 g/t 37,800 koz
Proven & Probable 4,311 kt Gold 3.32 g/t 460.4 koz
Proven & Probable 4,311 kt Silver Equivalent 550 g/t 76,180 koz
Measured & Indicated 4,285 kt Silver 395 g/t 54,480 koz
Measured & Indicated 4,285 kt Gold 4.94 g/t 681 koz
Measured & Indicated 4,285 kt Silver Equivalent 813 g/t 112,060 koz
Inferred 4,256 kt Silver 306 g/t 41,930 koz
Inferred 4,256 kt Gold 3.57 g/t 489 koz
Inferred 4,256 kt Silver Equivalent 609 g/t 83,310 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Total cash costs Silver Equivalent USD  ......  Subscription required  ......  Subscription required  ......  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  ......  Subscription required  ......  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.
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Operating Costs:

Units20222021202020192018
Total operating costs ($/t milled) USD 155.76  142  127.91  131.9  117.46  

Financials:

Units2022202120202019201820172016
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 16.8   2.5   11.4  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 20.5   21.8   36.2  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 102.5   91.8   147.6  
Operating Income M USD  ......  Subscription required  ......  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  
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Pipelines and Water Supply
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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 Jul 20, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 20, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 24, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 20, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required 2022
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required 2017
Subscription required Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
Press Release 2023
Annual Report 2022
Form 40-F 2022
Management Discussion & Analysis 2022
Other 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 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Annual Report 2018
Form 40-F 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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