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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 Colonia Cata
Guanajuato
Guanajuato, Mexico
36010
Phone  ...  Subscription required
Fax473-733-5512
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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
  • Zinc
  • Lead
Mining Method
  • Cut & Fill
Processing
  • Flotation
Mine Life9 years (as of Jan 1, 2016)
Latest NewsGreat Panther Restarts Operations at Topia     December 17, 2020


Owners

Source: p. 17
CompanyInterestOwnership
Great Panther Mining Ltd. 100 % Indirect
GPR holds a 100% interest in the property through its wholly owned Mexican subsidiary, Minera Mexicana el Rosario, S.A. de C.V. (MMR).

Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

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 pyroclastics. 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.

Mineralization within the veins consists mainly of massive galena, sphalerite, with lesser pyrite, arsenopyrite, and tetrahedrite in a gangue of quartz, barite, and calcite. The vein constituents often include minor adularia and sericite, and the wider fault zones contain significant proportions of clay as both gouge and alteration products. Ore minerals occur as cavity-filling masses, comprising millimetre-scaled crystals of galena and sphalerite. Some observations on metal zoning include, the lower parts of the mines are reported to contain slightly higher copper-gold content than at higher elevations; high silver grades are associated with higher proportions of base metals; the mines are located over an extreme range of elevations (1,000 – 1,800masl) on the Property and that each has vertical limits of mineralization from 100-200m with the deeper seated and more southern mines tending to have more arsenopyrite and the more western mines having more pyrite.

The veins range in thickness from a few centimetres to two metres. They are very continuous along strike, with the main veins extending more than 4km. The Madre vein has been mined for 3.5km and the Cantarranas vein for 2.4km. Many of the other veins have been mined intermittently over similar strike lengths. Vertically, the veins grade downward to barren coarse-grained quartz-rich filling and upwards to barren cherty quartz-calcite-barite vein filling. The main host rock is andesite of the Lower Volcanic Series, which is usually competent, making for generally good ground conditions within the mine. In wider sections, with greater clay content and/or zones of structural complexity, ground conditions are less favourable.


Mining Methods

  • Cut & Fill


Summary:

For the narrower veins at Topia, mining is conducted by conventional cut and fill stoping with resuing to selectively mine the ore and leave the waste for backfill. Drilling is performed with jackleg drills and ore is hand mucked in the stope and dropped down timber crib muck passes which are carried upwards as the stoping advances. Ore is hand sorted at the face so that only the higher-grade ore is removed from the stope. Man-access and ventilation is provided in timber crib man-ways adjacent to the muck passes. The level interval for the stopes is typically 40m.

The use of ground support in the small tunnels and narrow stopes is infrequent as the small headings require little support.

From the muck passes the ore is pulled via manual chutes, loaded into small rail cars and hand trammed to a dump at the portal. At the surface ore dump, the ore may again be hand sorted to remove waste material. Waste from the hand sorting or from excess development is generally dumped over the bank of the hillside at these smaller mines. Ore is then picked up by front end loader and loaded into highwaystyle 10t- to 20t-capacity dump trucks to be hauled to the mill.

Along the Argentina and Don Benito veins, in the Argentina and 1522 Mines respectively, there are significant areas with vein widths of 0.5 to one metre. In these wider areas, mining is planned on the basis of mechanized cut and fill with resuing to selectively mine the ore and leave the waste for backfill. Equipment used includes small 2-yd3 LHD’s for development and 1-yd3 and 0.5-yd3 LHD’s for mucking in the stopes. Development access is provided via decline. Ground support consists of rock bolts and mesh as required. Rock bolts include a combination of cement-grouted rebar and split set which gives initial support from the split set bolt and then longer term support from the cement grouted portion of the bolt.

Sublevels are 40 metres apart in the mechanized cut and fill areas. Waste is generated from material beside the vein which is blasted separately from the ore and then left as fill, or from the waste development in the mine.

Lifts in the cut and fill stope are taken with horizontal holes (breasting) as the use of uppers drilling (to increase productivity and production) generated a ragged back in the stope and led to problems with ground support.

Ore is hauled from the stopes by LHD and then loaded into a truck for haulage to the mill.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 15" x 24" 1
Cone crusher 1
Ball mill 6' x 14' 1
Ball mill 5' x 10' 1
Ball mill 4' x 8' 1


Processing

  • Flotation

Source: Subscription required

Summary:

The mill employs conventional crushing, grinding, and flotation to produce lead and zinc sulfide concentrates. The operation runs seven days a week, 24 hours per day, with Sunday day-shift reserved for maintenance.

Recoveries & Grades:

CommodityParameter2019201820172016201520142013
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Head Grade, g/t 392344376354356343351
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 0.940.790.890.560.480.450.57
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Head Grade, % 3.443.413.472.822.992.692.94
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Head Grade, % 2.652.822.581.961.941.821.93
Subscription required - Subscription is required.

Production:

CommodityUnits201920182017201620152014
Silver oz  ......  Subscription required  ......  Subscription required595,721574,031677,967667,636
Gold oz  ......  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
Lead 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.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Ore tonnes mined  ......  Subscription required
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required55,836 t65,387 t67,387 t
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required275 t275 t275 t
Subscription required - Subscription is required.

Reserves at December 31, 2019:
Mineral Resources has been estimated for the Topia Project with an effective date of 31 July 2018

CategoryTonnage CommodityGradeContained Metal
Measured 310,600 t Silver 474 g/t 4,732,807 oz
Measured 310,600 t Gold 1.36 g/t 13,579 oz
Measured 310,600 t Zinc 4.2 %
Measured 310,600 t Lead 4.02 %
Measured 310,600 t Silver Equivalent 474 g/t 9,920,000 oz
Indicated 165,300 t Silver 436 g/t 2,317,563 oz
Indicated 165,300 t Gold 1.34 g/t 7,123 oz
Indicated 165,300 t Zinc 3.79 %
Indicated 165,300 t Lead 3.57 %
Indicated 165,300 t Silver Equivalent 436 g/t 4,850,000 oz
Inferred 400,400 t Silver 434 g/t 5,586,431 oz
Inferred 400,400 t Gold 1.34 g/t 17,248 oz
Inferred 400,400 t Zinc 2.97 %
Inferred 400,400 t Lead 2.86 %
Inferred 400,400 t Silver Equivalent 434 g/t 10,720,000 oz

Commodity Production Costs:

CommodityUnits2019201820172016201520142013
Cash costs Silver Equivalent USD 13.8 / oz 13.6 / oz 13.4 / oz
Cash costs Silver USD  ......  Subscription required†  ......  Subscription required† 9.53 / oz† 11.4 / oz† 12.2 / oz† 15.8 / oz† 18.7 / oz†
All-in sustaining costs (AISC) Silver Equivalent USD 16.2 / oz 14.1 / oz
All-in sustaining costs (AISC) Silver USD  ......  Subscription required†  ......  Subscription required† 15 / oz† 15.3 / oz† 13.2 / oz† 18.7 / oz† 25.8 / oz†
All-in sustaining costs (AISC) Silver Equivalent USD 17 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2019201820172016201520142013
Total operating costs ($/t milled) USD 213180190143143164174.76

Financials:

Units2019201820172016201520142013
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 0.48   1.6   0.41  
Revenue M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 12  USD 16  CAD 15.9  CAD
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 29, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 29, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 29, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2018
Subscription required Subscription required Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Corporate Presentation 2017
Press Release 2017
Annual Information Form 2016
Management Discussion & Analysis 2016
Form 40-F 2015
Management Discussion & Analysis 2015
Management Discussion & Analysis 2014
Technical Report 2014
Subscription required - Subscription is required.

News:

NewsDate
Great Panther Restarts Operations at Topia December 17, 2020
Great Panther Temporarily Suspends Operations at Topia November 16, 2020
Great Panther Provides Update on Covid-19 and Planned Restart of Mexican Operations May 13, 2020
Great Panther Silver Increases Mineral Resource at Topia Mine January 29, 2019

Aerial view:

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