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Mexico
Topia Mine

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 Location:
232 km NW from Durango, Durango, Mexico

  Regional Office:
Ex Hacienda de Bustos s/n, Col. Cata
Guanajuato
Guanajuato, Mexico
36010
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Silver
  • Gold
  • Lead
  • Zinc
Mining Method
  • Resue mining
  • Cut & Fill
  • Backfill
Production Start...
Mine Life3 years (as of Jan 1, 2020)
Topia consists of several mines, which comprise Argentina, 15-22, San Miguel, 9 North, San Juan, Recompensa, Hormiguera, El Rosario, La Prieta, El 80, and Durangueno.


Owners

Source:
CompanyInterestOwnership
Guanajuato Silver Company, Ltd. 100 % Indirect
Great Panther Mining Limited reports that it has closed the previously announced sale of its Mexican subsidiary Minera Mexicana El Rosario S.A. de C.V., which owns the Guanajuato Mine Complex, the Topia mine, and the El Horcón and Santa Rosa projects, to Guanajuato Silver Company Ltd.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Epithermal


Summary:

Deposit Type The mineral deposits at Topia are adularia-sericite-type, silver-rich, polymetallic epithermal veins. Silver-gold-lead-zinc mineralization is found in fissure-filling veins along sub-parallel faults cutting andesitic flows, breccias, and pyroclastic rocks. Deposits are usually characterized by multiple veins in areas measuring 10 to 15km2 with individual veins generally less than 2m in thickness but up to 3-4km in length. The Topia district lies within the Sierra Madre Occidental (SMO), a north-northwest-trending belt of Cenozoic-age rocks extending from the US border southwards to approximately 21°N latitude. The belt measures roughly 1,200 km long by 200 km to 300 km wide. Rocks within the SMO comprise Eocene to Miocene age flows and tuffs of basaltic to rhyolitic composition with related intrusive bodies. The Topia area is underlain by a km thick package of Cretaceous and Tertiary andesite lavas and pyroclastic rocks which are, in turn, overlain by younger rhyolitic flows and pyroclastics. The volcanic sequence is transected by numerous faults, some of which host the mineralized veins in the district. There are two sets of faults: one striking 320° to 340° and dipping northeast and the other striking 50° to 70° and dipping steeply southeast to vertically. The northeast-trending faults are the principal host structures for precious and base metal mineralization. Epithermal systems, as the name suggests, form near surface, usually in association with hot s ........


Mining Methods

  • Resue mining
  • Cut & Fill
  • Backfill


Summary:

Topia consists of several mines, which comprise Argentina, 15-22, San Miguel, 9 North, San Juan, Recompensa, Hormiguera, El Rosario, La Prieta, El 80, and Durangueno.

The Topia underground mining operation producing approximately 225tpd (operating) from fourteen (14) mines on 52 separate veins using conventional mining methods, including resuing.

Mining at Topia generally consists of development along very narrow veins. Mining is selective using jacklegs, however, where possible, mechanized cut and fill is deployed. All mines are accessed via adits and ramps, although internal passes are constructed to access the upper and lower ore zones. Rock integrity at the mines at Topia is considered favorable, but on rare occasions roof support, in the form of rock bolting, and occasionally wire mesh, is required.

Mining is conducted by contractors and in-house miners sourced from nearby communities and outside cities, and utilizes equipment owned mostly by the Company. Mine contractors and equipment are alternated between the mines to accommodate the variations in production plans.

For the narrower veins at Topia, mining is conducted by modified cut and fill stoping (resuing) to selectively mine the ore and leave the waste for backfill. In a stope the ore is blasted and extracted first, then the wall rock is blasted as stope fill. Drilling is performed with jackleg drills and ore is hand mucked in the stope and dropped down timber crib muck ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits202120202019201820172016
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required761,107595,721574,031
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc t  ......  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.
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Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required77,290 t75,729 t
Tonnes milled  ......  Subscription required  ......  Subscription required79,257 t73,605 t53,745 t55,836 t
Daily processing capacity  ......  Subscription required  ......  Subscription required220 t275 t
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Reserves at March 31, 2021:
Measured, Indicated, and Inferred Mineral Resources are reported at a cut-off Net Smelter Return (NSR) in US$, include 1522 Mine $280/t, Argentina Mine $257/t, Durangueno Mine $202/t, Recompensa Mine $245/t, Hormiguera Mine $230/t, El Rosario Mine $345/t, La Prieta $254/t, Animas $287/t, San Miguel $241/t, San Juan $233/t, Laura (Hipolito) $252/t, and Union de Pueblo $241/t.

CategoryTonnage CommodityGradeContained Metal
Measured & Indicated 331.8 kt Silver 609 g/t
Measured & Indicated 331.8 kt Gold 1.84 g/t
Measured & Indicated 331.8 kt Lead 4.4 %
Measured & Indicated 331.8 kt Zinc 4.5 %
Measured & Indicated 331.8 kt Silver Equivalent 1041 g/t 11,106,538 oz
Inferred 274.6 kt Silver 592 g/t
Inferred 274.6 kt Gold 1.44 g/t
Inferred 274.6 kt Lead 3.35 %
Inferred 274.6 kt Zinc 3.63 %
Inferred 274.6 kt Silver Equivalent 931 g/t 8,222,655 oz

Commodity Production Costs:

CommodityUnits202120202019201820172016
Cash costs (sold) Silver Equivalent USD 13.8 / oz   13.6 / oz  
Cash costs (sold) Silver USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 6.9 / oz†   9.53 / oz†   11.4 / oz†  
All-in sustaining costs (sold) Silver Equivalent USD 17 / oz   16.2 / oz  
All-in sustaining costs (sold) Silver USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 8.5 / oz†   15 / oz†   15.3 / oz†  
† Net of By-Product.
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Operating Costs:

Units20192018201720162015
Total operating costs ($/t milled) USD 213180190143143

Financials:

Units202120202019201820172016
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 0.8   2.3   1.8  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 19.8   14.4   12  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 3.9   1.8   1.1  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 4   1.8   1  
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 2, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 2, 2022
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required 2020
Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required 2017
Subscription required Subscription required Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 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 2019
................................... Subscription required 2019
................................... Subscription required 2019
Financial Review 2018
Management Discussion & Analysis 2018
Technical Report 2018
Corporate Presentation 2017
Financial Review 2017
Press Release 2017
Annual Information Form 2016
Management Discussion & Analysis 2016
Financial Review 2015
Form 40-F 2015
Management Discussion & Analysis 2015
Management Discussion & Analysis 2014
Technical Report 2014
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