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Mexico
Avino Mine (Avino Oxide Tailings Project)

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 Location:
65 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
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Silver
  • Copper
  • Gold
Mining Method
  • Sub-level stoping
  • Longitudinal retreat
  • Room-and-pillar
Processing
  • Filter press plant
  • Dewatering
  • Gravity separation
  • Centrifugal concentrator
  • Flotation
Mine Life20.4 years (as of Jan 1, 2020)
In early April of 2020, Avino suspended mining-related activities at the Project site due to the COVID-19 pandemic.

August 3, 2021 - Mining operations have restarted at the Avino Mine.
Latest NewsAvino Reports Q4 And Ye 2021 Financial Results     March 16, 2022


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 %

Deposit Type

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


Summary:

The Avino concession is located within a 12 km (north–south) by 8.5 km (east–west) caldera. The Property contains numerous low-sulphidation epithermal veins, breccias, stockwork, and silicified zones that grade into a “near porphyry” environment, particularly in the Avino Mine area. The caldera has been uplifted by regional north-trending block faulting (a graben structure), exposing a window of andesitic pyroclastic rocks of the lower volcanic sequence within the caldera. The Lower Volcanic Sequence is overlain by the Upper Volcanic Sequence, consisting of rhyolite to trachyte flows and extensive ignimbrites and intruded by monzonite bodies.

AVINO VEIN
Geology and mineralization of the Avino Vein are summarized from Slim (2005d).

The Avino Vein is 1.6 km long and 60 m wide on the surface. The Avino Vein is the most striking and important example of the epithermal mineralization of the district whose structures are normally weathered and leached in their upper section as a result of contact with atmospheric waters producing a band of oxide minerals and zones of supergene enrichment to a depth of about 70 m.

In the oxide portion of the Avino Vein, the common minerals encountered include hematite, limonite, anglesite, and copper carbonate in white or green, somewhat chloritized, quartz zones. The common primary and secondary minerals encountered are argentite, bromargyrite, chalcopyrite, chalcocite, galena sphalerite, bornite, native silver, free gold, and native copper. Other minerals present in mineralized areas include quartz, pyrite, chlorite, barite, arsenopyrite, pyrrhotite, and specularite.

Higher silver values are reported to decrease overall with depth, except at vein intersections and vein inflections, where higher values persist to depth. The same can be said for gold, although the higher values start just below the onset of silver mineralization, at or near the surface. In contrast, higher copper values coincide with vein intersections and may increase with depth. Sporadic, localized copper enrichment occurs toward the footwall contact and may represent a different phase of fluid emplacement. Despite the overall decrease in precious metal grade with depth, local increases in metal grades are apparent in the mine sampling and exploration drilling, possibly reflecting changes in boiling level with pressure variations in the epithermal system.

The Avino Vein has been followed longitudinally for more than 1,300 m and vertically for more than 600 m. It strikes north 66° east with an east-west splay, and dips to the south and southeast at 60° to 70°. Steeply dipping, high grade zones within the vein and stock-work zones are frequently found in the upper part of the vein, as well as at its intersections with a number of lateral veins. An example of a higher-grade area of mineralization encountered with major lateral vein intersecting the Avino was the El Hundido, which exceeded 40 m in thickness. In the lower areas of the vein and mine, mineralized cross-veins, branch-veins, and stockwork zones have been found in the footwall at San Luis and at El Hundido, and are assumed to persist with depth.

The hanging wall of the Avino Vein is andesite, while the footwall is a monzonite intrusive with andesite sections. A post-mineralization fault parallel with the vein occurs in the hanging wall at a distance of several metres in the area of San Luis, while in the central part of El Hundido, this fault is located at the contact with the vein over a distance of about 300 m, up to the area of Santa Elena and San Antonio. From that point, and proceeding toward the El Chirumbo Mine, this fault cuts the vein between the face at San Carlos and the exposure at the underground ramp. The fault then enters the footwall where it remains until a point about 30 m east of the west face of the Chirumbo area, producing a downward displacement of the vein of between 50 m to 100 m.

At Chirumbo, the fault largely replaces the vein due to strong leaching by post-mineralization circulating of water in the gouge. On the east face at Chirumbo, the fault again enters the hanging wall; in this zone the vein is composed of branches and stockwork, and to the east of this point, the fault crosses the vein numerous times.

The deposit is epithermal and made up of veins and dependent stockwork structures, mainly in the hanging wall and often associated with vein intersections. Four vein systems have been described which, in decreasing order of importance, are:
• system striking east–west, dipping south at 60° to 70°, including the Avino Vein and its possible extension in the Cerro de San Jose;
• system striking north 60° to 70° west, dipping 60° to 80° southwest, comprising the following important veins: El Trompo, San Juventino, San Jorge, Platosa, Los Reyes, Potosina, El Fuerte, and Conejo;
• system striking north 20° to 30° west, dipping between 60° to 80° to either the southwest or northeast, comprising the following significant veins: San Gonzalo, Aguila Mexicana, and La Calcita, as well as the Stockwork La Potosina, and the Stockwork El Fuerte;
• systems striking north 60° to 80° east, dipping 60° to 80° southeast, comprising the following veins: Santiago, Retana, Nuestra Senora, and San Pedro and San Pablo.

SAN GONZALO VEIN
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 open-space 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

  • Sub-level stoping
  • Longitudinal retreat
  • Room-and-pillar


Summary:

Avino is currently mining on the Avino Vein using sublevel stoping and room and pillar mining methods. Levels are spaced 20 m apart and accessed via crosscuts from the main ramp. Access into the Avino Vein is through the ET Mine.

The room and pillar mining method is used on each sublevel to mine out each level to the extents of the mineralization. Long holes are then drilled between the sublevels to facilitate blasting of the mineralization between the sublevels. In 2020, Avino reported it will transition from development-style mining to full-scale production mining to feed all four circuits using the long hole retreat mining method, which is anticipated to incur lower mining costs.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 30' x 42' 150 HP 1
Jaw crusher 20" x 36" 75 HP 1
Cone crusher 5.5' 300 HP 1
Cone crusher ....................... Subscription required 300 HP 1
Cone crusher 4.25' 200 HP 1
Ball mill 2.4m x 1.8m 225 HP 2
Ball mill 3.2m x 4.6m 1000 HP 2

Summary:

The existing crushing plant was upgraded to accommodate the higher throughput. Mill feeds from different sources will be crushed separately, and the crushed materials will be conveyed to separate bins that are dedicated to the different grinding and flotation circuits. The upgraded crushing facility includes:
- one 30 ft. by 42 ft. jaw crusher with an installed power of 150 HP
- one 20 in. by 36 in. jaw crusher (standby unit) with an installed power of 75 HP
- one 5.5 ft. standard cone crusher with an installed power of 300 HP
- one 4.25 ft. standard cone crusher with an installed power of 200 HP
- one Nordberg HP500 crusher with an installed power of 300 HP
- one 5 ft. by 16 ft. scalping screen with apertures of 3/8 in.
- one 8 ft. by 20 ft. scalping screen with apertures of 3/8 in.
- other ancillary equipment, such as feeders, surge bins, conveyors, belt magnet, and metal detector.

With the upgrades, the crushing circuit is capable of crushing mill feeds at the rate of 2,500 t/d.

The plant consists of a conventional three-stage crushing circuit with the tertiary crusher in closed circuit with a screen. The crushed material is fed to each of the grinding lines, each consisting of a ball mill and related classification hydrocyclone(s) to grind the crushed mill feeds to a grind size of approximately 65% to 75% passing 200 mesh. The grinding mills used are 2.4 m diameter by 1.8 m long ball mills for Circuits #1 and #2, each with an installed power of 225 HP, and 3.2 m diameter by 4.6 m long ball mills for Circuits #3 and #4, each with an installed power of 1,000 HP.

A centrifugal gravity concentrator has also been installed in the grinding circuits to recover coarse precious metal particles into a high-grade gold/silver concentrate suitable for dispatching directly to a smelter.


Processing

  • Filter press plant
  • Dewatering
  • Gravity separation
  • Centrifugal concentrator
  • Flotation

Flow Sheet: Subscription required

Summary:

The mill feed is processed in a conventional flotation mill that has four separate circuits and a capacity of 2,500 t/d. The four circuits include the following:
- Circuit #1 was used to process materials from the San Gonzalo Mine, which has been stopped since the end of 2019. The circuit was used to produce a lead concentrate containing gold and silver, as well as a zinc concentrate. The circuit has now been modified to process materials from the ET Mine and produces a copper flotation concentrate containing silver and gold. The processing rate is 250 t/d.
- Circuit #2 is used to process mill feed from the ET Mine and produces a copper flotation concentrate containing silver and gold. The processing rate is 250 t/d.
- Circuit #3 is used to process materials from the ET Mine and produces a copper flotation concentrate containing silver and gold. The processing rate is 1,000 t/d.
- Circuit #4 is currently used to process materials from the ET Mine, although it also p ........

Recoveries & Grades:

CommodityParameter2021202020192018201720162015
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required84858587
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required53646765
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required87899087
Copper Head Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required0.550.480.50.62
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required69696475
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required0.490.520.420.29
Copper Concentrate Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required2220.320.323.8
Gold Concentrate Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required15.316.712.29.47
Silver Concentrate Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required2,0302,5602,6202,470

Production:

CommodityProductUnits2022202120202019201820172016
Silver Equivalent Metal in copper conc. koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required1,8471,9111,606
Silver Metal in copper conc. koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Metal in copper conc. M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Metal in copper conc. oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Tonnes milled  ......  Subscription required  ......  Subscription required427,147 t426,794 t460,890 t429,289 t
Ore tonnes mined  ......  Subscription required  ......  Subscription required456,100 t428,075 t462,279 t450,281 t
Daily milling capacity  ......  Subscription required  ......  Subscription required2,650 t2,650 t
Subscription required - Subscription is required.

Reserves at October 30, 2020:
Cut-off grade is 60 g/t AgEQ for the reported Mineral Resources.

CategoryTonnage CommodityGradeContained Metal
Measured 4.76 Mt Silver 74 g/t 11.3 M oz
Measured 4.76 Mt Copper 0.55 % 26.3 kt
Measured 4.76 Mt Gold 0.63 g/t 97 koz
Measured 4.76 Mt Silver Equivalent 120 g/t 18.4 M oz
Indicated 13.89 Mt Silver 59 g/t 26.5 M oz
Indicated 13.89 Mt Copper 0.41 % 56.7 kt
Indicated 13.89 Mt Gold 0.68 g/t 304 koz
Indicated 13.89 Mt Silver Equivalent 107 g/t 47.9 M oz
Measured & Indicated 18.65 Mt Silver 63 g/t 37.8 M oz
Measured & Indicated 18.65 Mt Copper 45 % 83 kt
Measured & Indicated 18.65 Mt Gold 0.67 g/t 401 koz
Measured & Indicated 18.65 Mt Silver Equivalent 111 g/t 66.3 M oz
Inferred 5.23 Mt Silver 51 g/t 8.5 M oz
Inferred 5.23 Mt Copper 0.34 % 17.7 kt
Inferred 5.23 Mt Gold 0.64 g/t 108 koz
Inferred 5.23 Mt Silver Equivalent 95 g/t 16 M oz

Commodity Production Costs:

CommodityUnits2021202020192018201720162015
Cash costs (sold) Silver Equivalent USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 9.26 / oz 8.87 / oz 9.3 / oz 7.64 / oz
All-in sustaining costs (sold) Silver Equivalent USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 10.7 / oz 10.3 / oz 11 / oz 11.1 / oz
Subscription required - Subscription is required.

Financials:

Units2022202120202019
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment as of January 13, 2021:
HME TypeSizeQuantity
Loader (FEL) 3.85 cu. m ....................... Subscription required
Truck (haul) 24 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 30, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 30, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... 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
Subscription required - Subscription is required.

News:

NewsDate
Avino Reports Q4 And Ye 2021 Financial Results March 16, 2022
Restart of Operations at the Avino Mine August 3, 2021
Avino Reports 60% Increase in Measured and Indicated Mineral Resources to 75.9 Million Ounces Silver Equivalent at the Avino Property January 13, 2021
Avino Provides Mine Update July 10, 2020
Avino Announces Phased Ramp-Up to Resume Mining Operations June 1, 2020
Avino Complies with the Mexican Government COVID-19 Order April 2, 2020
Avino Announces an Updated Mineral Resource Estimate at the Avino Property February 21, 2018

Aerial view:

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