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Mexico
La Platosa Mine

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 Location:
48 km N from Torreón, Durango, Mexico

  Address:
Km. 5 Carretera Bermejillo-Ceballos, Pueblo Bermejillo
Mapimí
Durango, Mexico
35230
Phone  ...  Subscription required
Fax01-872-776-0196
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  • Overview
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  • Mining
  • Processing
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  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Silver
  • Lead
  • Zinc
Mining Method
  • Cut & Fill
  • Drift & Fill
Processing
  • Flotation
Mine Life2023
The Platosa Property is the Excellon’s principal producing property.
Latest NewsExcellon Delivers Strong Q4 2020 Silver Production     January 14, 2021


Owners & OPERATOR

Source: p. 19
CompanyInterestOwnership
Excellon Resources Inc. 100 % Indirect
Minera Excellon de Mexico S.A. de C.V. (operator) 100 % Direct
The Platosa mine is 100 percent-owned and operated by Minera Excellon de Mexico S.A. de C.V., a wholly owned subsidiary of Excellon Resources Inc. (Excellon), a Canadian company listed on the TSX (symbol EXN) with its corporate office in Toronto, Ontario.

Deposit Type

  • Manto
  • Carbonate replacement


Summary:

The bulk of mineralization currently defined on the Platosa project occurs as shallow to steeply dipping bodies of massive carbonate-replacement deposits (CRD). These bodies have been identified and categorized as discrete pods or mantos based on structural setting and concentration of sulphides. The main manto bodies currently defined at Platosa are listed below from west to east:
• Mantos 6A/6B
• Mantos 4A-C
• Manto 5
• Guadalupe
• Guadalupe South
• Pierna
• Rodilla
• Manto 623
• Manto 674
• NE-1
• NE-1 South.

The footprint of the Platosa manto system currently measures approximately 400 by 700 metres. Mantos at Platosa dip in accordance with the stratigraphy towards the east where a series of late extensional features down-drop the mineralization so that its depth ranges from 60 metres below surface on the west side of the mine to approximately 320 metres below surface at the NE-1 manto, on the east side of the mine.

The main lead-, zinc-, and silver-bearing minerals are:
• Galena (main lead-bearing mineral)
• Sphalerite (main zinc-bearing mineral)
• Acanthite and lesser proustite (main silver-bearing minerals). Acanthite is predominant;
proustite is visible where grades typically exceed the average grade of the mineralized body.

The most significant mantos at Platosa are the Rodilla, Pierna, Guadalupe South, Manto 674, and 623 mantos, which are currently mined; and the NE-1 and NE-1 south mantos, which are included in the mine plan and that are open for expansion. These mantos have been defined in drilling from surface with an average drill spacing of 15 to 20 metres. In 2016, Excellon commenced a program of infill and expansion drilling ahead of production. This drilling was conducted on 10-metre-spacing in production areas and has been successful in discovering and defining additional mineralization near existing mine infrastructure, most notably in the 623 and Guadalupe South areas.

Mineralization is also seen in the form of vein, breccia, and skarn systems.


Mining Methods

  • Cut & Fill
  • Drift & Fill


Summary:

The primary mining method has historically been a modified room and pillar, with the top of the manto being accessed first. For steeply dipping mantos, the area is benched down to a maximum height of 20 metres at which point a sill pillar is established. This process is repeated below the sill pillar until the bottom of the manto is reached. Historically, sill pillars were seldom necessary considering the flat- lying nature of the mantos, although these will become necessary where the mineralized body dips more steeply.

In 2018, Platosa transitioned the mining method to a cut and fill/drift and fill to increase the mining recovery. Engineering was completed for the construction of sill mattes composed of cemented rock fill (CRF) to eliminate the need for sill pillars in the future.

Primary stope accesses for cut-and-fill are driven into the deposit on a 15 percent decline. The bottom cut is mined, and the area is then backfilled with waste rock to facilitate extraction of the next cut. This sequence is repeated up to five times until the stope access reaches an incline of 15 percent. Access to the next cut is then provided by a 15 percent decline driven from a higher elevation. The mine plan anticipates that the cut and fill stopes will be backfilled with unconsolidated development waste, except for where a sill matte will be required when mining will occur directly below. Development waste from active headings as well as waste that has been stockpiled underground will be used to backfill the cut and fill stopes.

Historical pillars are being extracted, with previously mined areas supported with cable bolts. Each area is evaluated individually based on the rock quality and economic viability.

The completion of the dewatering project has allowed Platosa to increase mechanization. Jacklegs have been replaced with jumbos in certain production areas, improving safety and productivity. Platform bolting drills were purchased in 2018 to improve the safety and productivity of installing ground support compared to current methods using handheld drills.

Mineralized material is hauled to surface using one 20-tonne haul truck and three 16-tonne haul trucks. The mineralized material is placed at surface at either the low-grade or high-grade stockpile. A wheel loader transfers the material from the stockpiles into the crusher; the material is then crushed to less than 25 millimetres. The crusher is equipped with a stacker conveyor that permits loading of the crushed material directly into haul trucks or can divert it on the ground if a truck is not available. The crushed material is hauled in 40-tonne covered trucks to the mineral processing facility located at Miguel Auza, 220 kilometres away.


Crushing and Grinding


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

Crushed mineralized material from Platosa is shipped to the Miguel Auza processing facility, located 220 kilometres south of the mine. The Miguel Auza mineral processing facility operates two circuits: one for lead-silver and one for zinc-silver.

The Miguel Auza processing facility has been treating silver-, lead-, and zinc-rich CRD Platosa mineralization since 2009. The facility was initially designed and constructed to process material from the lower-grade Miguel Auza mine at a rate of 650 tonnes per day. Modifications were made in 2009 to ensure that the facility would be able to process the higher-grade feed; the flotation cells have been operating at 325 to 350 tonnes per day since that time. The unused cells are still on site and can be put back into production if required. The Miguel Auza processing facility currently produces two concentrates: a lead-silver and a zinc concentrate.

Crushing and Grinding
The Platosa 2,000 tonne-per-day primary jaw cr ........

Recoveries & Grades:

CommodityParameter201920182017201620152014
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Head Grade, g/t 490391393456491603
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Head Grade, % 4.753.883.754.44.566.57
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Head Grade, % 6.825.425.35.77.28.9
Subscription required - Subscription is required.

Production:

CommodityUnits201920182017201620152014
Silver oz  ......  Subscription required  ......  Subscription required718,460752,689794,2891,162,929
Lead lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required53,234 t54,485 t64,170 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required55,593 t56,849 t64,206 t
Daily mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required350 t
Subscription required - Subscription is required.

Reserves at March 31, 2018:

CategoryTonnage CommodityGradeContained Metal
Indicated 485 kt Silver 549 g/t 8,562 koz
Indicated 485 kt Lead 5.6 % 59,752 k lbs
Indicated 485 kt Zinc 5.9 % 62,953 k lbs
Indicated 485 kt Silver Equivalent 1055 g/t 16,456 koz
Inferred 13 kt Silver 516 g/t 216 koz
Inferred 13 kt Lead 4.7 % 1,344 k lbs
Inferred 13 kt Zinc 6.5 % 1,859 k lbs
Inferred 13 kt Silver Equivalent 1014 g/t 426 koz

Commodity Production Costs:

CommodityUnits201920182017201620152014
Total cash costs (sold) Silver USD  ......  Subscription required†  ......  Subscription required† 10.4 / oz† 13.4 / oz† 15.1 / oz† 13.8 / oz†
All-in sustaining costs (sold) Silver USD  ......  Subscription required†  ......  Subscription required† 28 / oz† 33 / oz† 22.6 / oz† 21.7 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units201920182017201620152014
Total operating costs ($/t milled) USD 300242266250275382

Financials:

Units201920182017201620152014
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1.63   3.34  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 16.2   30.8  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -2.52   2.38  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 0.03   0.44  
Subscription required - Subscription is required


Heavy Mobile Equipment as of March 31, 2018:
HME TypeModelSizeQuantity
Drill jumbo (single boom) ....................... Subscription required 2
Load-Haul-Dump (LHD) 3 cu. yd 1
Load-Haul-Dump (LHD) ....................... Subscription required 5 cu. yd 1
Load-Haul-Dump (LHD) 4 cu. yd 3
Load-Haul-Dump (LHD) 2 cu. yd 1
Load-Haul-Dump (LHD) ....................... Subscription required 1 cu. yd 1
Scissor Lift 1
Underground truck 12 t 1
Underground truck 20 t 1
Underground truck 16 t 3
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 7, 2018
....................... Subscription required ....................... Subscription required Subscription required Aug 10, 2020
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required Subscription required Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Annual Information Form 2017
Corporate Presentation 2017
Financial Review 2017
Management Discussion & Analysis 2017
Press Release 2017
Annual Information Form 2016
Financial Review 2016
Management Discussion & Analysis 2016
Annual Information Form 2015
Management Discussion & Analysis 2015
Preliminary Economic Assessment 2015
Subscription required - Subscription is required.

News:

NewsDate
Excellon Delivers Strong Q4 2020 Silver Production January 14, 2021
Excellon Provides Update on Restart of Operations June 1, 2020
Excellon Provides Update on Developments Related to COVID-19 Response April 2, 2020
Excellon Reports 2019 Annual and Fourth Quarter Financial Results March 31, 2020
Excellon Announces 2019 Production Results January 28, 2020
Excellon Completes $11.5 Million Bought Deal Financing August 27, 2019
Excellon Announces $10 Million Bought Deal Financing August 6, 2019

Aerial view:

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