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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
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Silver
  • Gold
Mining Method
  • Mechanized Cut & Fill
  • Longhole stoping
Processing
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Merrill–Crowe
  • Cyanide (reagent)
Mine Life22 years (as of Jan 1, 2014)
Latest NewsFirst Majestic Files Updated Technical Reports, 2020 Mineral Reserve and Mineral Resource Estimates & Appoints New Director     March 31, 2021


Owners

Source: p. 20, 35, 37
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.

Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

The deposits of the San Dimas district are high grade, silver-gold-epithermal vein deposits characterized by low sulphidation and adularia-sericitic alteration. They were formed during the final stages of igneous and hydrothermal activity from quartz-monzonitic and andesitic intrusions.

Typical of epithermal systems, the gold and silver mineralization at the San Dimas mine exhibits a vertical zonation with a distinct top and bottom that the prior owner of the mine termed the "Favourable Zone". At the time of deposition, this Favourable Zone was deposited in a horizontal position paralleling the erosional surface of the LVG on which the UVG was extruded.

This favourable, or productive, zone at San Dimas varies from 300 metres to 600 metres in vertical extent and can be correlated, based both on stratigraphic and geochronologic relationships, from vein system to vein system and from fault block to fault block.

The mineralization is typical of epithermal vein structures with banded and drusy textures. Within the San Dimas district, the veins occupy east-west trending fractures except in the southern part of Tayoltita where they strike mainly northeast and in the Santa Rita mine where they strike north- northwest. The veins were formed in two different systems. The east-west striking veins were the first system developed, 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 vary from a fraction of a centimetre in width to 8 metres, but average 1.5 metres. They have been followed underground from a few metres in strike length to more than 1,500 metres.

Three major stages of mineralization have been recognized in the district: (1) early stage; (2) ore forming stage; and (3) late stage quartz. Three distinct sub-stages of the ore forming stage also have been identified, each characterized by distinctive mineral assemblages with ore grade mineralization always occurring in the three sub-stages: (1) quartz-chlorite-adularia; (2) quartz- rhodonite; and (3) quartz-calcite.

The minerals characteristic of the ore forming stage are composed mainly of white, to light grey, medium to coarse grained crystalline quartz with intergrowths of base metal sulphides (sphalerite, chalcopyrite and galena) as well as pyrite, argentite, polybasite, stromeyerite, native silver and electrum.

The ore shoots within the veins have variable strike lengths (5 to 600 metres); however, most average 150 metres in strike length. Down-dip extensions of ore shoots are up to 200 metres but are generally less than the strike length.


Mining Methods

  • Mechanized Cut & Fill
  • Longhole stoping


Summary:

The San Dimas Mine operation includes four underground gold and silver mining areas: the West Block (San Antonio mine); the Sinaloa Graben Block; the Central Block and the Arana Block (the Santa Rita mine). Vein thickness varies from 0.1 metres to 8 metres with the average approximately 1.9 metres. Some veins have a strike length of more than 1,500 metres. Vein dips vary from about 35 o to sub-vertical, the latter being decidedly more prevalent. The general mining recovery factor is about 95%, while that for sill mining is about 75%.

Typical mining of the vein systems is by mechanized cut-and-fill and long-hole, using drill jumbos or jacklegs, pneumatic long-hole drills and load-haul-dump machines, with primary access provided by adits and internal ramps from an extensive tunnel system under the steep, mountainous terrain.

The basis for ore haulage at San Dimas is load-haul-dump (“LHD”) equipment feeding trucks for haulage to the portal and then plant stockpiles. In the Tayoltita mine, the LHD equipment load rail wagons for haulage to the Tayoltita mill crushing plant. Development waste is generally moved to stopes as fill.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Ball mill 12' x 14' 3

Summary:

The Mill presently employs three-stage crushing and three ball mills (12' x 14') that can operate simultaneously or separately to achieve 70% to 75% passing 200 mesh.

At San Dimas, the Company plans to install a new 3,000 tpd HIG mill circuit to further improve recoveries and reduce operating costs.Furthermore, milling at San Dimas will be converted into a single AG grinding mill thereby eliminating the use of the three standard ball mills currently in operation. This AG conversion is expected to reduce energy consumption, eliminate steel grinding media, improve metallurgical recoveries and streamline maintenance and mill practices.


Processing

  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Merrill–Crowe
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The San Dimas mining complex includes one milling facility at Tayoltita with a 2,500 tpd capacity to process the production from the active mining areas. The Tayoltita mill has a conventional Merrill-Crowe process flowsheet that employs crushing and grinding followed by cyanidation and zinc precipitation for recovery of gold and silver.

Leaching is completed in a series of tanks providing minimum of 75 hours of leach residence time. The pregnant solution is recovered in a counter current decant (CCD) circuit with the gold and silver recovered from solution in a zinc precipitation circuit.

Refining uses an induction furnace to produce 1,000 oz silver and gold doré bars (average 98% pure).

Recoveries & Grades:

CommodityParameter202020192018201720162015
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required949695
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required296228274
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required979897
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required4.363.944.9

Production:

CommodityProductUnits2021202020192018201720162015
Silver Metal in doré koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required3,6223,9605,3208,300
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
Silver Payable metal koz  ......  Subscription required  ......  Subscription required3,618
Silver Equivalent Payable metal koz  ......  Subscription required  ......  Subscription required
Gold Equivalent Metal in doré oz  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required444,711 t759,087 t993,093 t
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required437,918 t762,167 t988,168 t
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required1,555 t2,074 t2,721 t
Subscription required - Subscription is required.

Reserves at December 31, 2019:
A two-step constraining approach has been implemented to estimate reserves for each mining method in use: A General Cut-Off Grade (GC) was used to delimit new mining areas that will require development of access and infrastructure and all sustaining costs. A second Incremental Cut-Off Grade (IC) was considered to include laterally adjacent mineralized material which recoverable value paysfor the following costs: variable cost of mining and processing, indirect costs, treatment costs, administration costs and plant sustaining costs, but excludes: fixed costs of mining and processing, and development sustaining costs. GC for Longhole: 340 g/t Ag-Eq, IC for Longhole: 250 g/t Ag-Eq, GC for Cut&Fill: 320 g/t Ag-Eq, IC for Cut&Fill: 240 g/t Ag-Eq these cut-off grades are based on actual and budgeted operating and sustaining costs, metallurgical recoveries and payable terms.

Cut-off grade considered to constraint resources assuming an underground operation was 250 g/t Ag-Eq, and was based

CategoryTonnage CommodityGradeContained Metal
Proven 1,918 kt Silver 313 g/t 19,270 koz
Proven 1,918 kt Gold 4.38 g/t 270.2 koz
Proven 1,918 kt Silver Equivalent 671 g/t 41,350 koz
Probable 3,199 kt Silver 327 g/t 33,660 koz
Probable 3,199 kt Gold 3.12 g/t 321.6 koz
Probable 3,199 kt Silver Equivalent 583 g/t 59,910 koz
Proven & Probable 5,117 kt Silver 321 g/t 52,930 koz
Proven & Probable 5,117 kt Gold 3.6 g/t 591.8 koz
Proven & Probable 5,117 kt Silver Equivalent 615 g/t 101,260 koz
Measured 1,860 kt Silver 487 g/t 29,110 koz
Measured 1,860 kt Gold 6.99 g/t 418 koz
Measured 1,860 kt Silver Equivalent 1050 g/t 62,810 koz
Indicated 2,957 kt Silver 438 g/t 41,620 koz
Indicated 2,957 kt Gold 4.26 g/t 405 koz
Indicated 2,957 kt Silver Equivalent 782 g/t 74,290 koz
Measured & Indicated 4,816 kt Silver 457 g/t 70,730 koz
Measured & Indicated 4,816 kt Gold 5.32 g/t 823 koz
Measured & Indicated 4,816 kt Silver Equivalent 885 g/t 137,100 koz
Inferred 5,871 kt Silver 341 g/t 64,350 koz
Inferred 5,871 kt Gold 3.58 g/t 676 koz
Inferred 5,871 kt Silver Equivalent 630 g/t 118,840 koz

Commodity Production Costs:

CommodityUnits2021202020192018201720162015
Cash costs Silver Equivalent USD  ......  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 856 / oz 559 / oz
Total cash costs Silver USD  ......  Subscription required†  ......  Subscription required† 0.11 / oz†
Total cash costs Gold USD 867 / oz† 774 / oz† 409 / oz†
All-in sustaining costs (AISC) Silver Equivalent USD  ......  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† 1,117 / oz† 680 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units202020192018
Total operating costs ($/t milled) 127.91131.9117.46

Financials:

Units2020201920182017201620152014
Sustaining costs M USD  ......  Subscription required  ......  Subscription required16.8  2.5   11.4   16.9  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required20.5  21.8   36.2   56.5   46.2  
Revenue M USD  ......  Subscription required  ......  Subscription required102.52  91.8   147.58   213.19   198.86  
Operating Income M USD  ......  Subscription required  ......  Subscription required22.7  -312.84   -120.49   48.8  
After-tax Income M USD -309.04   -102.04   12   17.9  
EBIT M USD -313.86   -121.98   44.6  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 17, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 17, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 17, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 17, 2021
Subscription required - Subscription is required.

Staff:

ContractorsTotal WorkforceYear
Subscription required Subscription required 2017
Subscription required Subscription required 2014

Corporate Filings & Presentations:

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

News:

NewsDate
First Majestic Files Updated Technical Reports, 2020 Mineral Reserve and Mineral Resource Estimates & Appoints New Director March 31, 2021
First Majestic Produces 5.5M Silver Eqv. Oz in Q4 2020 (3.5M Silver Oz and 26K Gold Oz); Provides 2021 Outlook and Conference Call Details January 20, 2021
First Majestic Reports First Quarter Financial Results; Temporarily Postpones the Sale of Silver and Gold Due to COVID-19; Announces Operational Restart Procedures May 14, 2020
First Majestic Updates 2019 Mineral Reserve and Resource Estimates March 30, 2020
First Majestic Completes Acquisition of Primero Mining May 11, 2018

Aerial view:

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