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Mexico
Los Filos Expansion (CIL) Project (Los Filos Complex)

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 Location:
12 SW from Mezcala, Guerrero, Mexico

  Project Contacts:

Mezcala
Guerrero, Mexico
40196
Phone  ...  Subscription required
Fax01 (733) 333 9457
EmailEmail
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StagePermitting
Mine TypeOpen Pit & Underground
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Drift & Fill
  • Overhand Cut & Fill
  • Underhand Cut & Fill
  • Longhole open stoping
  • Cemented backfill
  • Dry waste backfill
Mine Life12.5 years (as of Jan 1, 2022)
Equinox Gold is expanding production at Los Filos with development of the new Bermejal underground mine (deposit has been contributing higher-grade ore since mid-2022). The Company is also considering construction of a new carbon-in-leach plant to process highergrade ore, which could increase production to more than 300,000 oz of gold per year.

The environmental permit (“MIA”) for the CIL plant and associated infrastructure was granted in August 2018 and 2021. At the time of completing the Los Filos Technical Report Equinox Gold has not made a construction decision for the CIL plant.


Owners

Source: p. 68
CompanyInterestOwnership
Equinox Gold  Corp. 100 % Indirect
Los Filos Mine Complex property are wholly owned by Desarrollos Mineros San Luis, S.A. de C.V. (DMSL), a Mexican company indirectly wholly owned by Equinox Gold.

Contractors

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Deposit Type

  • Breccia pipe / Stockwork
  • Skarn
  • Intrusion related


Summary:

Mineralization on the Los Filos Mine property is typical of intrusion-related gold–silver iron-oxide skarn deposits.

Los Filos Deposit Area Mineralization
In the Los Filos area, mineralization is associated with two early Tertiary granodiorite stocks that were emplaced in carbonate rocks and resulted in development of high-temperature calc-silicate and oxide metasomatic alteration (skarn) assemblages that were followed by distinct meso to epithermal alteration. Hematite and magnetite are typical skarn minerals, but diopside, which is usually recognized in skarn assemblages, is not present.

The Nukay and Sur deposits formed along the north and southern margins of the West Stock . The Peninsular and Zona 70 deposits formed on the northern and southwest margins of the East Stock, respectively.

The Los Filos Open Pit mineralization is hosted primarily within or on the lower contact of a diorite sill that dips from 20° to 50° to the east, away from the East Stock. The diorite was emplaced into a large, moderately dipping active structure that parallels bedding in the marble. The sill has a sigmoidal shape that starts out roughly flat at the stock, extends east at a moderate dip for approximately 200 m, turns south, flattens out, and extends to the Bermejal Intrusion, located approximately 2 km to the south.

Mineralization—Eastern Los Filos Open Pit
The diorite sill hosts a significant proportion of the mineralization on the eas ........


Mining Methods

  • Truck & Shovel / Loader
  • Drift & Fill
  • Overhand Cut & Fill
  • Underhand Cut & Fill
  • Longhole open stoping
  • Cemented backfill
  • Dry waste backfill


Summary:

The Los Filos Mine Complex encompasses the three main open pit mining areas of Bermejal (BOP), Guadalupe (GOP), and Los Filos (LFOP), as well as three underground mines, Los Filos South, Los Filos North (LFUG) and Bermejal Underground (BUG).

Open pit mining entails conventional drilling and blasting, with loading by excavator and haulage by trucks to a crusher (for Crushed heap leach processing) or directly to a run-of-mine leach pad.

At LFUG, the overhand cut and fill (OHCAF) mining method is used in narrow areas and the overhand drift and fill (OHDAF) method is used in the wider areas. Longhole open stoping (LHOS) mining method is also used in targeted areas of vertical ore-body continuity and good rock conditions. The mining methods planned for BUG are OHDAF and underhand drift-and fill (UHDAF).

Open Pit Mining
The Los Filos Mine Complex comprises three open pit areas: LFOP, GOP, and BOP. Open pit mining is owner-operated, with conventional drilling and blasting. Loading is currently undertaken by shovels and front-end loaders (FEL), and haulage by 136-tonne trucks. A larger mining fleet is proposed to replace the existing equipment at the end of their useful life. Benches are 9 m high with safety berms every second bench (i.e., double-benched to 18 m).

Ore (Crush) is hauled either to the crusher, for crushed heap leach, or directly to an ROM leach pad for processing. A 10,000 t/d CIL processing plant is planned to be constr ........


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

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Projected Production:

CommodityUnitsLOM
Gold M oz 2.8
Silver M oz  ......  Subscription required
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Daily processing capacity  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing capacity  ......  Subscription required
* According to 2022 study.
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Reserves at June 30, 2022:
Underground Mineral Reserves are reported based on a variable NPR cut-off- value varying between $65.8/t and $96.6/t.

Open pit Mineral Resources are reported to a gold cut-off grade of 0.2 g/t. Underground Mineral Resources are reported to a gold cut-off grade: Los Filos South Underground, 1.71 g/t Au; Los Filos North
Underground, 2.05 g/t Au; Bermejal underground 2.71 g/t Au.

CategoryTonnage CommodityGradeContained Metal
Proven 35,453 kt Gold 0.77 g/t 877 koz
Proven 35,453 kt Silver 5.1 g/t 5,809 koz
Probable 157,773 kt Gold 0.88 g/t 4,477 koz
Probable 157,773 kt Silver 7.2 g/t 36,761 koz
Proven & Probable 193,226 kt Gold 0.86 g/t 5,354 koz
Proven & Probable 193,226 kt Silver 6.9 g/t 42,570 koz
Measured 82,395 kt Gold 1.06 g/t 2,795 koz
Measured 82,395 kt Silver 6.7 g/t 17,738 koz
Indicated 428,818 kt Gold 0.79 g/t 10,824 koz
Indicated 428,818 kt Silver 7.6 g/t 105,275 koz
Measured & Indicated 511,213 kt Gold 0.83 g/t 13,620 koz
Measured & Indicated 511,213 kt Silver 7.5 g/t 123,013 koz
Inferred 170,774 kt Gold 0.74 g/t 4,051 koz
Inferred 170,774 kt Silver 8.4 g/t 45,958 koz

Commodity Production Costs:

CommodityUnitsAverage
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2022 study / presentation.
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Operating Costs:

Units2022
Crushing costs ($/t milled) USD 0.04 *
Processing costs ($/t milled) USD  ......  Subscription required
* According to 2022 study.
Subscription required - Subscription is required.

2022 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Processing OpEx $M USD 585
Subscription required - Subscription is required.


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 30, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 1, 2023
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Staff:

EmployeesYear
Subscription required 2022

Corporate Filings & Presentations:

DocumentYear
Fact Sheet 2022
Fact Sheet 2022
Feasibility Study Report 2022
Other 2022
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Technical Report 2012
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