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Mexico
La Platosa Mine

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 Location:
48 km N from Torreón, Durango, Mexico

  Address:
Bermejillo Km 5 - Ceballos
Mapimí
Durango, Mexico
35230
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  • Overview
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  • Mining
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  • Fleet
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Silver
  • Lead
  • Zinc
Mining Method
  • Overhand Cut & Fill
  • Bench stoping
Production Start...
Mine Life2022
Excellon currently expects to wind down operations at Platosa during Q3 2022, subject to results from ongoing exploration programs.


Owners

Source: p. 10
CompanyInterestOwnership
Excellon Resources Inc. 100 % Indirect
Minera Excellon de Mexico S.A. de C.V. (operator) 100 % Direct
Excellon Resources Inc. (Excellon) operates and owns 100% of the Platosa Mine through its wholly owned subsidiary, Minera Excellon de Mexico S.A. de C.V.

Contractors

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Deposit Type

  • Carbonate replacement
  • Manto
  • Skarn


Summary:

The principal mineral deposits in the Platosa area are high-temperature epigenetic silverlead-zinc carbonate-replacement deposits (CRD).

The Platosa Property lies in the Sierra Bermejillo, a northwest-trending anticline-syncline pair developed in Mesozoic sedimentary rocks. The Sierra Bermejillo Anticline is a relatively open fold that plunges to the southeast. The Saltillera Syncline is a doubly plunging structure located west of the anticline. The folded sequence is cut by a set of north- to northwest-striking, steeply dipping fractures and faults. Tertiary felsic to intermediate dykes and plutons intrude these structures in the western part of the Sierra Bermejillo.

The principal fault system in the property area is the Platosa Structural Zone (PSZ), a 250 to 1,500 metre-wide northwest-trending zone of fracturing and shearing that traverses the eastern margin of the Sierra Bermejillo. The PSZ includes a series of fault planes that strike north–north westerly and dip steeply east; it has been mapped along strike for five kilometres northwest and southeast of the Platosa Mine. It is characterized by brecciated, crushed, and dolomitized limestone; slickenside fracture surfaces; iron and manganese oxides; travertinefilled breccias; and coarsely crystalline selenite veins, some up to five metres thick. The faulted rocks weather recessively and create a negative topographic expression of the PSZ.

Mineralization
The bulk of mineralization cur ........


Mining Methods

  • Overhand Cut & Fill
  • Bench stoping


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 2019, the Platosa Mine transitioned the mining method from cut and fill/drift and fill to an overhand cut and bench method (“OCB”) to improve the overall mining cycle efficiency.

Primary stope accessesfor the OCB method are driven into the deposit horizontally and subsequent bench cuts are conducted until the sill elevation isreached. A cemented rock fill mat is placed on the sill elevation and the remainder of the stope filled with dry rock fill. The sill pillar above is then long hole drilled and blasted on retreat and mucked with a remote scooptram. It is then filled remotely when the pillar extraction is complete. The sequence has a higher cycle efficiency requiring fewer man-hours to extract the stopes than the previous cut and fill method. Development waste from active headings as well as waste that has been stockpiled underground is used to backfill the stopes.

The completion of a dewatering project has allowed the P ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2021202020192018201720162015
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required917,714718,460752,689794,289
Lead lbs  ......  Subscription required  ......  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  ......  Subscription required
Silver Equivalent oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate.
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Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required74,876 t57,475 t57,165 t53,234 t
Tonnes milled  ......  Subscription required  ......  Subscription required75,247 t81,004 t63,742 t55,593 t
Daily milling capacity  ......  Subscription required  ......  Subscription required350 t350 t
Daily ore mining rate  ......  Subscription required  ......  Subscription required300 t
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Reserves at December 31, 2021:
Mineral Resources are estimated at a cut-off grade of 309 g/t AgEq.

CategoryTonnage CommodityGradeContained Metal
Indicated 193 kt Silver 596 g/t 3,695 koz
Indicated 193 kt Lead 5.8 % 24,498 k lbs
Indicated 193 kt Zinc 5.6 % 23,765 k lbs
Indicated 193 kt Silver Equivalent 922 g/t 5,715 koz
Inferred 43 kt Silver 336 g/t 461 koz
Inferred 43 kt Lead 4.7 % 4,375 k lbs
Inferred 43 kt Zinc 2 % 1,850 k lbs
Inferred 43 kt Silver Equivalent 519 g/t 711 koz

Commodity Production Costs:

CommodityUnits202120202019201820172016
Total cash costs (sold) Silver USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 9.48 / oz†   10.4 / oz†   13.4 / oz†  
Net cost Silver USD  ......  Subscription required†
All-in sustaining costs (sold) Silver USD  ......  Subscription required†  ......  Subscription required† 20.7 / oz†   28 / oz†   33 / oz†  
† Net of By-Product.
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Operating Costs:

Units2021202020192018201720162015
Total operating costs ($/t milled) USD 291299300242266250275

Financials:

Units202120202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 3.2   6.8   8.2  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 24.3   21.2   17  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 0.7   0.4   0.7  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -7.7   -1.5   -0.6  
Operating Cash Flow M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -2.9  
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Heavy Mobile Equipment as of March 31, 2021:
HME TypeSizeQuantity
Drill jumbo (single boom) ....................... Subscription required
Truck (dump) 4 cu. yd ....................... Subscription required
Truck (dump) 20 t ....................... Subscription required
Truck (haul) 16 t ....................... Subscription required
Truck (haul) 20 t ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Apr 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 26, 2022
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
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 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Corporate Presentation 2018
Management Discussion & Analysis 2018
Press Release 2018
Technical Report 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
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