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United States
Mesquite Mine

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 Location:
50 km NW from Yuma, California, United States

  Address:
6502 East US Highway 78
Brawley
California, United States
92227-9306
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WebsiteWeb
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  • Overview
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life2023
Mesquite is an open-pit, run-of-mine heap leach gold mine.

2023 plan: Pivot to less stripping and small-pit mining in 2023 to reduce costs, continue exploration and permitting for mine life extension.


Owners

Source: p. 24
CompanyInterestOwnership
Western Mesquite Mines Inc. (operator) 100 % Direct
Equinox Gold  Corp. 100 % Indirect
Western Mesquite Mines, Inc., Equinox’s wholly-owned subsidiary, holds a 100% interest in the property and operates the Mesquite mine.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Epithermal
  • Breccia pipe / Stockwork


Summary:

The gold mineralization at Mesquite Mine was deposited in an epithermal setting, within 500 to 1,000 ft of the surface. The majority of the economically attractive mineralization is found in the biotite gneiss and hornblende-biotite gneiss, while the mafic gneiss and intrusive rocks are generally less mineralized. Gold mineralization is found both disseminated and vein hosted within these units. The majority of the veining is controlled by faults and fault junctions, which have moderate to steep dips.

The gold mineralization dominantly occurs in two types:
- pods of mineralization limited in lateral and vertical extent at fault intersections;
- trends of mineralization along faults.

The principal types of mineralization defined at Mesquite are as follows:
• Early epidote - quartz veinlets overprinted by chlorite veinlets;
• Two-stage siliceous matrix breccia (SMBX) developed along faults planes with quartzadularia matrix ± pyrite;
• Quartz ± adularia ± pyrite ± electrum veinlets with sericite halos;
• Ankerite ± Dolomite ± pyrite veinlets;
• Bleached zones on fault planes with green sericite ± pyrite;

Gold occurs at Mesquite as both submicron disseminated and coarse gold. All documented gold occurrences are native gold, and classification has been based on silver content and grain size. A silver-free native gold is the most common type in the oxidized zone. It occurs in particles less than five microns, altho ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mesquite is an operating open pit mine with ore processed by heap leaching using a CIC circuit to recover gold. Current mine production is a nominal 178,000 tons per day of total material, including a nominal 50,000 to 68,000 tons per day of ore that is hauled to the leach pad. Total mine production is capped at 65 million tons per year based on a restriction of the air quality permit.

Highwall slope angle criteria vary by area and pit. In general, the steepest walls are on the south side of the property and the shallowest in the northeast. In general, the inter-ramp angles vary from 29 to 42 degrees depending on pit area and wall orientation.

The final pit designs are based on pit shells using the Lerch-Grossman algorithm in Mine Plan software. Pits were generated using a revenue factor of 1.0 or gold price of $1,350/oz. These pit shells were used as the basis for the final phase designs in each pit area. The pit optimization utilized metallurgical recoveries of 75% for oxide ores and 35% for non-oxide ores.

The detailed pit phase designs at Mesquite are based on the pit optimization shells generated with the current resource model.

Three pit areas are considered in the reserves statement: Brownie (1-phase), Vista East (2-phases), Vista West (1-phase) plus two areas in the Big Chief waste dump. Each pit has been designed to accommodate mining by the existing mining fleet. Mining occurs on 30 ft. lifts with catch benches spaced eve ........


Crushing and Grinding


Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityUnits2023202220212020201920182017
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required155169
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required25,221 kt24,600 k tons20,828 kt
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required32,925 kt40,200 k tons38,023 kt
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required1.31 1.63 1.83
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Reserves at June 30, 2021:
Mineral Reserve: The cut-off grade varied by material type from 0.14 g/t for oxide and oxide-transition and 0.24 g/t for non-oxide materials.

Mineral Resource: Oxide and oxide transition cut-off grade of 0.09 g/t gold. Non-oxide and non-oxide transition cut-off grade of 0.18 g/t gold.

CategoryTonnage CommodityGradeContained Metal
Proven 34 kt Gold 0.79 g/t 1 koz
Probable 30,264 kt Gold 0.48 g/t 470 koz
Proven & Probable 30,298 kt Gold 0.48 g/t 471 koz
Measured 81 kt Gold 0.77 g/t 2 koz
Indicated 104,910 kt Gold 0.41 g/t 1,382 koz
Measured & Indicated 104,991 kt Gold 0.41 g/t 1,384 koz
Inferred 84,030 kt Gold 0.34 g/t 912 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 723 / oz   727 / oz  
Cash costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†
Total cash costs (sold) Gold USD
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 819 / oz   727 / oz  
All-in sustaining costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units202220212020201920182017
OP mining costs ($/t mined) USD 1.481.471.421.481.311.3
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units2023202220212020201920172016
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 12.8   35.6  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 215.7   141.7  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 32.8   29.4  
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Water Supply
Source: Subscription required

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Heavy Mobile Equipment as of December 31, 2022:
HME TypeModelSizeQuantity
Drill (blasthole) 8.75 inch
Loader (FEL) ....................... Subscription required 28 cu. yd ....................... Subscription required
Loader (FEL) ....................... Subscription required 26 cu. yd ....................... Subscription required
Shovel (hydraulic) ....................... Subscription required 44 cu. yd ....................... Subscription required
Truck (haul) ....................... Subscription required 200 tons ....................... Subscription required
Truck (haul) ....................... Subscription required 205 tons ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 30, 2023
....................... Subscription required ....................... Subscription required Subscription required Dec 31, 2019
....................... Subscription required ....................... Subscription required Subscription required Dec 31, 2019
....................... Subscription required ....................... Subscription required Subscription required May 30, 2023
....................... Subscription required ....................... Subscription required Subscription required May 30, 2023
....................... Subscription required ....................... Subscription required Subscription required May 30, 2023
....................... Subscription required ....................... Subscription required Subscription required May 30, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsYear
Subscription required 2022
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Fact Sheet 2023
Annual Information Form 2022
Fact Sheet 2022
Financial Review 2022
Management Discussion & Analysis 2022
Other 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
................................... Subscription required 2019
Management Discussion & Analysis 2018
Press Release 2018
Press Release 2018
Quarterly Report 2018
Technical Report 2018
Annual Information Form 2017
Financial Review 2017
Year-end Mineral Reserves 2017
Annual Information Form 2016
Corporate Presentation 2016
Corporate Presentation 2016
Fact Sheet 2016
Financial Review 2016
Annual Report 2015
Financial Review 2014
Technical Report 2014
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