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Mexico
La Encantada Mine

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 Location:
141 km NW from Nueva Rosita, Coahuila, Mexico

  Regional Office:
Fanny Anitúa No. 2700 Colonia Los Ángeles
Durango
Durango, Mexico
34076
Phone  ...  Subscription required
Fax01(618)-827-9070
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
  • Lead
  • Gold
  • Zinc
Mining Method
  • Cut & Fill
  • Inclined caving
  • Sub-level caving
  • Longhole stoping
Production Start...
Mine Life2024
Development La Encantada mine in 2022 focused on the second levels of both the Ojuelas and Milagros orebodies. These deposits contain higher silver grades and will contribute to production in 2023.

Recent changes to milling operations improved ore throughput capacity and are expected to generate higher recoveries.


Owners

Source: p. 66
CompanyInterestOwnership
First Majestic Silver Corp. 100 % Indirect
The La Encantada mine is owned and operated by the First Majestic Silver Corp.’s wholly owned indirect subsidiary, Minera La Encantada, S.A. de C.V.

Contractors

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Deposit Type

  • Manto
  • Skarn
  • Vein / narrow vein
  • Carbonate replacement
  • Breccia pipe / Stockwork
  • Intrusion related


Summary:

Deposit Types
Deposits at La Encantada are examples of polymetallic, high-temperature, intrusion-related carbonate-replacement and minor skarn-hosted deposits. The carbonate-replacement deposits are hosted by the Jurassic–Cretaceous Aurora Formation.

Mineralization
Mineralization consists of polymetallic, high-temperature, intrusion-related carbonate-replacement and minor skarn-hosted deposits. Mineralization occurs as tabular veins, mantos, massive lenses, breccia pipes, and irregular replacement zones.

The deposits were grouped into four geological zones: the Prieta complex, the San Javier–Milagros complex, the Vein systems, and Tailings Deposit No. 4.

Discordant, near-vertical deposits with irregular elongate shapes proximal to main intrusions are referred to as chimneys and breccia pipes. These include the San Javier, Milagros and Prieta breccia deposits.

Tabular sub-vertical replacement deposits are referred to as veins and can contain richer mineral shoots or small chimneys at the intersection of northwest-trending faults and fractures. Steeply dipping, tabular deposits of the Vein systems have a northeast orientation, and are commonly distal to main intrusions.

Massive lens replacement zones of the Prieta complex are proximal to a granodiorite source intrusion and formed adjacent to skarn alteration. Contact metamorphic features (recrystallization to marble, development of hornfels and skarnoid) normall ........


Mining Methods

  • Cut & Fill
  • Inclined caving
  • Sub-level caving
  • Longhole stoping


Summary:

The La Encantada mine operation consists of an underground mine. Mining activities are conducted by both First Majestic and contractor personnel.

The deposits vary in dip, thickness, and geotechnical conditions along strike and dip. Multiple mining methods are required to achieve the maximum efficient extraction of mineralization. Three well established methods were selected:
• Inclined and sublevel caving;
• Long hole stoping;
• Cut-and-fill.

Inclined and sub-level caving is well suited for the bulk tonnage deposits at La Encantada such as the San Javier– Milagros breccias and the Ojuelas deposit.

Longhole stoping is being used for near-vertical structures that are relatively consistent along strike and length and have competent wall rock. The minimum planned mining width is 1.4 m, based on a minimum vein width of 1.0 m plus an allowance for 0.2 m on the hangingwall and footwall.

Cut-and-fill is performed using jackleg drilling and is used for vein deposits that are irregular in nature and commonly possess poorer geotechnical conditions. The minimum mining width is 1.3 m, based on a minimum vein width of 1.0 m and an additional 0.15 m was added to both the hangingwall and footwall as planned dilution.

Ground conditions throughout most of the La Encantada mine are considered good. In contrast, the breccia and massive lens-type deposits form weak, soft material that lends itself to caving mining methods. The ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityProductUnits2023202220212020201920182017
Silver Metal in doré koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required1,6042,178
Silver Equivalent Metal in doré koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Metal in doré oz  ......  Subscription required  ......  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 required1,5972,169
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Daily milling capacity  ......  Subscription required  ......  Subscription required4,000 t4,000 t4,000 t4,000 t
Ore tonnes mined  ......  Subscription required  ......  Subscription required860,613 t890,008 t916,894 t825,486 t
Tonnes milled  ......  Subscription required  ......  Subscription required860,613 t890,008 t916,894 t825,486 t
Daily ore mining rate  ......  Subscription required  ......  Subscription required
Daily waste mining rate  ......  Subscription required  ......  Subscription required
Daily milling rate  ......  Subscription required  ......  Subscription required3,000 t
Subscription required - Subscription is required.

Reserves at December 31, 2022:
The Cut-off grades used to constrain the Mineral Resource estimates are 60 g/t Ag for sub-level caving, 105 g/t Ag for cut-and-fill, 80 g/t Ag for Longhole Stoping, and 110 g/t Ag for Tailings.

Mineral resource estimates are for silver only.

CategoryTonnage CommodityGradeContained Metal
Probable 3,192 kt Silver 133 g/t 13,610 koz
Indicated 6,635 kt Silver 148 g/t 31,610 koz
Inferred 3,499 kt Silver 171 g/t 19,290 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Credits (by-product) Silver USD -0.03 / oz  
Cash costs Silver USD 12.5 / oz  
Total cash costs Silver Equivalent USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total cash costs Silver USD  ......  Subscription required  ......  Subscription required 18.9 / oz   12.8 / oz  
Total cash costs Silver USD  ......  Subscription required  ......  Subscription required 18.8 / oz†   12.7 / oz†  
All-in sustaining costs (AISC) Silver Equivalent USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All-in sustaining costs (AISC) Silver USD  ......  Subscription required  ......  Subscription required 23.8 / oz†   15.5 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units20222021202020192018201720162015
UG mining costs ($/t milled) USD 6.17  7.56  10.4  
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units2022202120202019201820172016
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 7.2   5.2  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 16.9   12.5   10  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 24.5   37.6   44.3  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -19.6   -5.2   -2.9  
Subscription required - Subscription is required


Water Supply
Source: Subscription required

- subscription is required.


Heavy Mobile Equipment as of December 31, 2020:
HME TypeModelSizeQuantityStatusLeased or
Contractor
Bolter ....................... Subscription required ....................... Subscription required Proposed Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required Existing Leased
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required Existing Leased
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required Existing Leased
....................... Subscription required ....................... Subscription required Proposed Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased
Truck (haul) ....................... Subscription required ....................... Subscription required Existing Leased
Truck (haul) 20 t ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required ....................... Subscription required Proposed Leased
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 20, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
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 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Annual Report 2018
Corporate Presentation 2018
Form 40-F 2018
Press Release 2018
Form 40-F 2017
Annual Report 2016
Corporate Presentation 2016
Financial Review 2016
Form 40-F 2016
Form 40-F 2015
Technical Report 2015
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