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Mexico
San Gonzalo Mine

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 Location:
67 km NE from Durango, Durango, Mexico

  Regional Office:
Alonso de Pacheco 300
Nueva Vizcaya
Durango
Durango, Mexico
34080
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StatusInactive / Suspended
Mine TypeUnderground
Commodities
  • Silver
  • Gold
Mining Method
  • Cut & Fill
  • Shrinkage stoping
Production Start...
During the last quarter of 2019 year, San Gonzalo reached the end of its current resources and mining was stopped.

Reclamation activities are estimated to begin in 2023 for the San Gonzalo Mine.


Owners

Source: p. 42
CompanyInterestOwnership
Avino Silver & Gold Mines Ltd. 99.67 % Indirect
Summary of Property Ownership:
- CMMA (subsidiary) - 98.45%;
- Promotora Avino, S.A. de C.V. (subsidiary) - 1.22%;
- Estate of Ysita (non-controlling interest) - 0.33%.

Contractors

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Deposit Type

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


Summary:

The San Gonzalo Vein is located approximately 1.4 km northeast of the eastern modelled extent of the Avino Vein. The San Gonzalo Vein system constitutes a strongly developed vein system over 25 m wide, trending 300° to 325°/80° northeast to 77° south. It is characterized by banded textures and openspace filling. The main vein has an average width of 2 m, but the silica-pyrite or iron oxide-sericite alteration with additional stock working extends across 300 m, south of the main San Gonzalo Vein to the Los Angeles vein.

The San Gonzalo is a typical narrow vein precious metal deposit with some erratic values and extends approximately 2 km to the northwest to the Santa Ana-Malinche area (Gunning 2009).

The Cerro San Jose-La Estella-San Gonzalo Cerro San Jose represents a distinct hydrothermal centre with similar characteristics to the Avino system which include the following (Paulter 2006):
• occur on a topographic high;
• strong to intense silicification and brecciation;
• easterly trending stockwork system similar to the trend of the Avino Vein;
• similar temperatures of formation to Avino;
• presence of an intersecting northwesterly trending vein system (la Estella at San Jose and San Juventino at Avino);
• emplacement along a northerly trending, deep crustal fault zone (defined by the Aguila Mexicana Vein at Cerro San Jose and the felsic dyke at Avino).


Mining Methods

  • Cut & Fill
  • Shrinkage stoping


Summary:

Cut-and-fill and shrinkage stoping methods are being used.

Access to the underground mining on the San Gonzalo Vein is via a 4 m by 4 m decline developed at - 12%. Ground conditions are good. Ground support is mainly bolting as required.

San Gonzalo is using shrinkage mining for the narrower material, approximately 1.4 m in width and cut and fill mining for mineralized material wider than 2 m.

During shrinkage mining, miners use hand-held jacklegs and stopers to drill and blast in stopes. Material is drilled and blasted using jacklegs to breast horizontally, with two miners from two ends of the stope with several breasts worked on at once. After each blast the swell (approximately 40% of the broken material) is mucked from the extraction drift below to allow room for the miners to drill the next lift.

Materials and supplies are carried into the stopes by hand down a small raise equipped with steel ladders and a rope. Only 40% of the material is extracted during mining, with the remainder being extracted after all the mining has been completed, meaning more stopes are required in the development stage at one time to sustain production targets. Scoops are used to muck from the extraction drift below and trammed to a mineralized material pass.

Cut and fill mining is more mechanized, as access for scoops is maintained in the stopes from the main ramp by a smaller access attack decline/incline ramp. This access means less ma ........


Crushing and Grinding


Processing

Source: Subscription required

Summary:

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Production:

CommodityUnits20192018201720162015
Silver oz  ......  Subscription required434,020590,765822,689907,384
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent oz  ......  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:

Metrics201920182017201620152014
Tonnes milled 56,179 dmt79,140 dmt81,045 dmt115,047 dmt121,774 dmt79,729 dmt
Ore tonnes mined 80,587 t108,943 t93,291 t70,525 t
Daily milling capacity 500 t

Reserves at October 30, 2020:
Cut-off grade is 130 g/t AgEQ for the reported Mineral Resources.

CategoryTonnage CommodityGradeContained Metal
Measured 267 kt Silver 263 g/t 2.3 M oz
Measured 267 kt Gold 1.36 g/t 12 koz
Measured 267 kt Silver Equivalent 356 g/t 3.1 M oz
Indicated 216 kt Silver 230 g/t 1.6 M oz
Indicated 216 kt Gold 1.09 g/t 8 M oz
Indicated 216 kt Silver Equivalent 304 g/t 2.1 M oz
Measured & Indicated 483 kt Silver 251 g/t 3.9 M oz
Measured & Indicated 483 kt Gold 1.29 g/t 20 koz
Measured & Indicated 483 kt Silver Equivalent 335 g/t 5.2 M oz
Inferred 85 kt Silver 233 g/t 0.6 M oz
Inferred 85 kt Gold 0.96 g/t 3 koz
Inferred 85 kt Silver Equivalent 298 g/t 0.8 M oz

Commodity Production Costs:

CommodityUnits2019201820172016
Cash costs (sold) Silver Equivalent USD  ......  Subscription required 10.4 / oz   8.04 / oz   7.3 / oz  
All-in sustaining costs (sold) Silver Equivalent USD  ......  Subscription required 11.9 / oz   9.5 / oz   9.4 / oz  



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2022
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Form 20-F 2018
Management Discussion & Analysis 2018
Press Release 2018
Press Release 2018
Management Discussion & Analysis 2017
Annual Report 2016
Technical Report 2016
Form 20-F 2015
Management Discussion & Analysis 2015
Form 20-F 2014
Technical Report 2013
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