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Mexico
El Compas Mine

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 Location:
1 km S from Zacatecas, Zacatecas, Mexico

  Regional Office:
Calle Cerro Gordo del Campestre No. 201, interior #208 Colonia Las Quintas
Leon Guanajuato
Guanajuato, Mexico
37125
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Mechanized Cut & Fill
Processing
  • Gravity separation
  • Filter press plant
  • Centrifugal concentrator
  • Flotation
Mine Life2021
The Company suspended mining operations at the El Compas mine in August 2021 due to exhaustion of reserves. The mine, plant and tailings facilities are on short term care and maintenance, while management conducts an evaluation of the alternatives including final closure.
Latest NewsEndeavour Silver Reports Financial Results for the Second Quarter 2021; Earnings Conference Call at 10am PDT (1pm EDT) Today     August 10, 2021


Owners

Source: p. 24
CompanyInterestOwnership
Endeavour Silver Corp. 100 % Indirect
In May, 2016 Endeavour Silver acquired Oro Silver Resources Ltd. which owned the El Compas project through its wholly owned Mexican subsidiary, Minera Oro Silver de Mexico SA de CV.

Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

The El Compas and El Orito veins have the characteristics of a low sulfidation epithermal vein system. They occur in a region characterised by numerous, high silver-grade intermediate sulfidation epithermal vein systems.

At the El Compas concession, northerly trending veins in the Chilitos Formation have finely banded, coliform and crustiform open space fill textures. Bladed quartz after calcite textures are common. Veins in felsic rocks are comprised of saccharoidal to fine-grained quartz, banded veins. Wider veins in felsic rocks are observed in the Cantera pit and at the El Compas shaft. These veins show breccia and bladed quartz-after calcite textures. Calcite is observed in bands in large andesite-hosted quartz veins and in veinlets distal to mineralised zones in very weakly propylitised rocks.

Within the El Compas ramp, the widest calcite veins (>0.75m, both black and white coarse grained calcite) occur as north-west trending veins. Large northerly trending calcite veins have not been observed on surface or in the El Compas ramp; however, thick calciterich quartz veins were intersected by drilling at deeper levels below the mine and elsewhere that appear to correlate with the north-south trending El Compas and other veins. Sulfide abundance in veins rarely exceeds 5%, and is most abundant in the mineralised veins. Pyrite or pyrrhotite are the most common sulfides. Rare sphalerite and exotic copper was observed at the 7th level of the El Compas ramp. Magnetite was identified in panned concentrates from the mineralised veins.


Mining Methods

  • Mechanized Cut & Fill


Summary:

Since publishing the El Compas preliminary economic assessment (“El Compas PEA”), the Company continued to optimize mining methods, the crushing circuit and grinding alternatives and was successful on a number of fronts in improving the operating metrics. The work index of the ore and the size on the motor allowed the capacity of the milling circuit to increase to 325 tpd, which allowed for the mining method to be changed to mechanized cut and fill from captive cut and fill. Mechanized cut and fill increases the mining rate but has the same cost profile as captive cut and fill previously disclosed in the El Compas PEA.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 24" x 36" 75 HP 1
Cone crusher ....................... Subscription required 4.25' 150 HP 1
Cone crusher ....................... Subscription required 4' 150 HP 1
Ball mill 8' x 9' 350 HP 1
Ball mill ....................... Subscription required 7' x 7.5' 1

Summary:

The treatment of the El Compas mineralization will be performed at the La Plata processing facility located 20km from the mine.

The mineralization will be delivered by truck from the mine in 20 tonne loads. Upon arrival at site, each truckload will be weighed on a platform scale. The mineralization will be dumped directly through a 200mm grizzly into a 63 tonne receiving hopper. Oversize (+200 mm) will be broken with a portable rock breaker. Excess material delivered from the mine is placed in separate coarse mill feed material pads, capable of accommodating up to 3,200 tonnes of mill feed. The mineralization from local miners will also be stored on pads before crushing and milling. The stockpiles will be located near the hopper in order to be fed into the plant with a front end loader.

Crushing will be done for 12 hours per day to ensure mill feed is available over the evening shift and with sufficient contingency to allow for scheduled crusher maintenance. The coarse mill feed material is delivered from the receiving hopper via a belt feeder to a 75 HP 0.6 m X 0.9 m Manyu jaw crusher. Primary crushing reduces the rock to a nominal 50 mm (2”) which is conveyed onto secondary crushing in a standard 150 HP 1.3m (4.25”) Symons cone crusher.

The secondary product is sent to a double deck vibrating screen, incorporating a 9.5mm (3/8”) bottom slot opening providing for a product particle size 80% passing (P80) of 6.4 mm (1/4”). The plus 9.5mm material is sent to a 150 HP 1.2 m (4”) Symons short head cone crusher operated in closed circuit with the screen. The minus 9.5 mm screened undersize is sent to a fine mill feed material bin having a 372 tonne live load capacity.

Mill feed is delivered from a fine mill feed material bin on a conveyor to feed the ball mill. The ball mill consists of an Avante 350 HP, 8’ dia. X 9’ mill.

The ball mill will operate in closed cycle with a dedicated hydrocyclone using a 300% circulating load. The hydrocyclone overflow would target a particle size of P80 of 75 microns that is directed to flotation. Hydrocyclone underflow would be sent to a splitter box, from where it will be pumped to a 1.7 mm (10 Tyler mesh) vibrating screen for gravity feed.


Processing

  • Gravity separation
  • Filter press plant
  • Centrifugal concentrator
  • Flotation

Flow Sheet: Subscription required

Summary:

The treatment of the El Compas mineralization will be performed at the La Plata processing facility located 20km from the mine.

The plant will be modified to produce a single gold-silver concentrate which would be sold to smelters and refiners. The process flowsheet will consist of conventional comminution, gravity and froth flotation. Endeavour Silver will upgrade the existing plant so that it can safely and reliably process 250tpd (200tpd from Endeavour Silver mining and 50tpd from toll mining) of mineralization averaging ± 5 g/t Au and ± 96 g/t Ag.

The projected recoveries of gold and silver based on open-circuit rougher and cleaner flotation tests are 83.5% and 73%, respectively. The cleaner concentrate grade will be 868 g/t Au and 12,095 g/t Ag.

The mineralization will be delivered by truck from the mine in 20 tonne loads. Upon arrival at site, each truckload will be weighed on a platform scale. The mineralization will be dumped directly thro ........

Recoveries & Grades:

CommodityParameter202120202019
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required

Production:

CommodityProductUnits202120202019
Gold Payable metal koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Metal in concentrate koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Payable metal koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent Payable metal koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019
Ore tonnes mined  ......  Subscription required  ......  Subscription required69,772 t
Daily ore mining rate  ......  Subscription required  ......  Subscription required345 t
Tonnes processed  ......  Subscription required  ......  Subscription required69,772 t
Daily processing capacity  ......  Subscription required  ......  Subscription required500 t
Subscription required - Subscription is required.

Reserves at December 31, 2021:
El Compas Mineral Resources cut-off grades are based on a 3.42 g/t gold equivalent.

CategoryTonnage CommodityGradeContained Metal
Indicated 20 kt Gold 6.42 g/t 4,000 oz
Indicated 20 kt Silver 78 g/t 49,000 oz
Indicated 20 kt Silver Equivalent 592 g/t 373,000 oz
Inferred 18 kt Gold 5.96 g/t 3,400 oz
Inferred 18 kt Silver 70 g/t 40,000 oz
Inferred 18 kt Silver Equivalent 547 g/t 311,000 oz

Commodity Production Costs:

CommodityUnits202120202019
Cash costs Silver USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Cash costs Silver USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (AISC) Silver USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units202120202019
Direct operating costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units202120202019
Sustaining costs M USD  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Proposed Heavy Mobile Equipment as of January 19, 2016:
HME TypeModelSizeQuantity
ANFO Loader ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 29, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 29, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 29, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 29, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Press Release 2022
................................... Subscription required 2021
................................... 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 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Press Release 2018
Preliminary Economic Assessment 2017
Year-end Mineral Reserves 2017
Preliminary Economic Assessment 2016
Subscription required - Subscription is required.

News:

NewsDate
Endeavour Silver Reports Financial Results for the Second Quarter 2021; Earnings Conference Call at 10am PDT (1pm EDT) Today August 10, 2021
Endeavour Silver Achieves Commercial Production at El Compas Mine in Zacatecas, Mexico April 1, 2019

Aerial view:

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