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Mexico
San Jose Mine

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 Location:
40 km S from Oaxaca, Oaxaca, Mexico

  Regional Office:
Carretera 175 Oaxaca-Huatulco
San José del Progreso
Oaxaca, Mexico
68050
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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
  • Gold
Mining Method
  • Overhand Cut & Fill
  • Room-and-pillar
  • Paste backfill
  • Dry waste backfill
Processing
  • Flotation
Mine Life5 years (as of Jan 1, 2019)
Latest NewsFortuna reports 2020 full year production of 11.3 million silver equivalent ounces and issues 2021 guidance     January 19, 2021


Owners

Source: p. 16
CompanyInterestOwnership
Fortuna Silver Mines Inc. 100 % Indirect
Compañía Minera Cuzcatlan S.A. de C.V. 100 % Direct
The San Jose underground mine is operated by Compania Minera Cuzcatlan S.A. de C.V., a Mexican subsidiary 100 percent owned by Fortuna.

Deposit Type

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


Summary:

The Trinidad silver-gold deposit at the San Jose Mine is a typical low-sulfidation epithermal deposit according to the classification of Corbett (2002), having formed in a relatively low temperature, shallow crustal environment. The deposit is characterized by structurally controlled hydrothermal breccias, crackle breccias and quartz-carbonate veins hosting silver-gold mineralization plus trace to minor base metal mineralization.

Precious metal mineralization at the San Jose Mine is hosted by hydrothermal breccias, crackle breccias, quartz-carbonate veins and zones of sheeted and stockwork-like quartz-carbonate veins emplaced along steeply dipping north and north-northwest trending fault structures.

The Trinidad vein system (Tv) is emplaced in the footwall fault zone of the extensional system hosting the mineralized vein systems at San Jose. The Trinidad vein system strikes 355° and dips 70° to 80° to the east-northeast. The vein system ranges from less than 1 meter to locally over 15 meters in true width, with higher grade mineralization generally being present in zones with greater widths. Significant portions of the Trinidad structure are characterized by late black matrix silicified fault breccias with only trace to weak mineralization. Higher grade precious metal zones in the Trinidad vein system range up to approximately 1,300 g/t Ag Eq across the width of the vein. Combined copper, lead and zinc values are generally less than one percent but locally higher concentrations are present. At approximately the 1,100 meter elevation in the central portion of the Trinidad Deposit, four drill holes intercepted higher grade base metal mineralization with combined copper, lead, and zinc values ranging up to 21.6 percent across the width of the vein system. Fault gouge seams are commonplace at the footwall and hanging wall of the Trinidad vein system. The Trinidad hanging wall splays and the Trinidad footwall veins are considered to be part of the Trinidad mineralized structure.

The Bonanza vein system (Bv) is emplaced in the hanging wall zone of the structural corridor hosting the mineralized vein systems in the Trinidad deposit. The Bonanza vein system generally strikes 350° and dips steeply to the east to sub-vertical. The Paloma vein (Pv) is considered to be part of the Bonanza vein system. Mineralization within the Bonanza vein system is present in the form of shoots plunging shallowly to moderately to the north-northwest, reflecting the dominant dip-slip movement of the controlling fault structures. Combined copper, lead and zinc values for the Bonanza Vein range from negligible in the upper portions of the vein system to approximately 0.1 to 0.5 percent at depth.

The Trinidad North discovery refers to an area located between 1846200N and 1847800N and below the 1200 meter elevation. Brownfields exploration in the Trinidad North area has been successful in identifying high-grade silver and gold mineralization associated with the northern extensions of the Bonanza and Trinidad vein systems and associated stockwork zones. Similar to the main Trinidad deposit, the mineralization is directly associated with the presence of hydrothermal breccias, crackle breccias and sheeted and stockwork-like quartz veinlets.

The Fortuna vein (Fv) strikes north-south and in contrast to the other major veins in the deposit, dips steeply to the west. The Fortuna vein has been extensively mined on levels 2, 3 and 4 of the historic mine workings with vein widths ranging from 2 meters to approximately 5 meters.

The main Stockwork Zone is located between 1846550N to 1847200N and 1,000 masl to 1,300 masl, being located in an extensional environment between the principal Bonanza and Trinidad structures. The main Stockwork Zone is present over 650 horizontal meters and 300 vertical meters being elliptical in shape, with a variable thickness ranging to greater than 50 meters. Stockwork-style mineralization is also present in the Trinidad North area between the Trinidad and Bonanza structures.

The primary silver bearing mineral in the Stockwork Zone is acanthite, usually in association with traces of pyrite. Secondary minerals accompanying the acanthite are silver-rich electrum, fine grained galena, sphalerite, chalcopyrite and gangue minerals including hyaline quartz, white quartz, and calcite along with minor concentrations of adularia and fluorite.


Mining Methods

  • Overhand Cut & Fill
  • Room-and-pillar
  • Paste backfill
  • Dry waste backfill


Summary:

The mining method applied at the San Jose Mine is overhand cut-and-fill using a mechanized extraction methodology. Production capacity has been 3,000 tpd since June 2016 as a result of a mill expansion.

The method chosen for underground mining is overhand cut-and-fill which removes ore in horizontal slices, starting from the bottom undercut and advancing upwards. When ore widths are greater than 8 m, a combination of overhan cut-and-fill and room-and-pillar methods has been selected as the most appropriate for the conditions encountered.

Mechanized mining uses a Jumbo drill rig to drill blast holes, scoop trams for loading and trucks for ore haulage. Rock support is provided through rock bolts and shotcrete. The deposit width ranges from 4.5 m to 17 m for the Bonanza and Trinidad vein systems and can be more than 30 m in the Stockwork Zone. Mechanized mining is regarded as the only methodology suitable for all veins based on the geological structure and geotechnical studies to date. The mechanized mining sequence includes: drilling (with a Jumbo drill rig), blasting, support, loading (by scoop
tram) and haulage:

1. Ore is extracted from the stope in horizontal slices that span the entire width and length of the stope using pivot cuts of up to ±15 % gradient.

2. After the stope has been mined out, voids are backfilled with paste or waste rock. The key performance indicators for this activity sets 85 t/h production rates for rock waste and 100 to 150 t/h for paste fill.

3. Drilling of horizontal slices is conducted in sections of 6 m by 6 m by mechanized jumbos which have a boom length of 5 m.

4. The blast pattern is charged with an explosive made up of emulsion and ANFO. The average power factor applied in the blasting is 0.45 kg/t for stopes. After the mine face has been blasted and ventilated, scaling of loose rock is conducted. This is an important phase of the mining cycle in terms of safety due to the risk of falling rock.

5. Mucking is done by scoop trams (6 yd3 capacity) from the face to an underground stockpile in the stope. Trucks with 14 m3 capacity transport the broken ore from the stopes to the surface stockpiles using a paved ramp which allows speeds of up to 25 km/h.

6. Required support is defined by the Geomechanics Department.


Crushing and Grinding


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

Expansion of the concentrate plant was successfully completed in June of 2016 taking the ore throughput capacity from 2,000 dry tpd to 3,000 dry tpd. The principal stages are follows:
1. Crushing
2. Milling
3. Flotation
4. Thickening, filtering and shipping.

Crushing at the San Jose mine is a dry process, where ore extracted from the mine is reduced in size from 406 mm to 12.7 mm to be fed to the mill.

The crushing process begins at the reception hopper, where ore from the mine is deposited. The ore is fed from the bottom of the hopper via a plate feeder into a jaw crusher that crushes the ore to a 102 mm product size prior to it being transported via conveyors to one 2.44 m by 6.1 m primary screen deck. The screen deck operates with one mesh of 35 mm opening. Material that does not pass through the 35 mm mesh is sent to a secondary crusher via a chute, where it is reduced to 25 mm and the product returned to the primary screen deck. The mater ........

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 252260238228234226194
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 1.571.751.771.721.831.721.46
Subscription required - Subscription is required.

Production:

CommodityProductUnits202020192018201720162015
Silver Metal in concentrate koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required7,5276,1244,929
Gold Metal in concentrate koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent Payable metal oz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Concentrate t
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required905,467 t717,505 t676,959 t
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required2,596 t2,072 t1,928 t
Daily mining capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required3,000 t of ore
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required3,000 t
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 232 kt Silver 311 g/t 2.3 M oz
Proven 232 kt Gold 2.12 g/t 16 koz
Probable 3,704 kt Silver 239 g/t 28.5 M oz
Probable 3,704 kt Gold 1.58 g/t 188 koz
Proven & Probable 3,936 kt Silver 243 g/t 30.8 M oz
Proven & Probable 3,936 kt Gold 1.61 g/t 204 koz
Measured 17 kt Silver 104 g/t 0.1 M oz
Measured 17 kt Gold 0.8 g/t 0.4 koz
Indicated 538 kt Silver 105 g/t 1.8 M oz
Indicated 538 kt Gold 0.7 g/t 12 koz
Measured & Indicated 555 kt Silver 105 g/t 1.9 M oz
Measured & Indicated 555 kt Gold 0.7 g/t 13 koz
Inferred 3,889 kt Silver 131 g/t 16.3 M oz
Inferred 3,889 kt Gold 0.96 g/t 120 koz

Commodity Production Costs:

CommodityUnits20202019201820172016
Cash costs Silver Equivalent USD  ......  Subscription required  ......  Subscription required 6.1 / oz
Cash costs Silver USD  ......  Subscription required† 0.95 / oz† 1.77 / oz†
All-in sustaining costs (AISC) Silver Equivalent USD  ......  Subscription required ^  ......  Subscription required  ......  Subscription required 10.1 / oz
All-in sustaining costs (AISC) Silver USD  ......  Subscription required† 7.11 / oz† 7.58 / oz†
All-in costs Silver Equivalent USD  ......  Subscription required  ......  Subscription required 10.1 / oz
All-in costs Silver USD  ......  Subscription required† 7.12 / oz† 10.6 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2019201820172016201520142013
UG mining costs ($/t milled) USD 36.330.932.530.4
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units20202019201820172016201520142013
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 35.8   21.5   13  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 48.8   27.5   19.2  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 101   108   65.1  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 34.2  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 50.1  
Subscription required - Subscription is required


Heavy Mobile Equipment as of February 22, 2019:
HME TypeSizeQuantity
Backhoe 90 HP 3
Drill jumbo (single boom) 4
Drill jumbo (two boom) 3
Rock bolter 4
Scissor Lift 4
Scoop Tram 6 cu. yd 7
Trans Mixer 4
Truck (service) 6
Truck (underground) 14 cu. m 15
Truck (underground) 7 cu. m 5

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 4, 2020
....................... Subscription required ....................... Subscription required Subscription required May 4, 2020
....................... Subscription required ....................... Subscription required Subscription required May 4, 2020
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Corporate Presentation 2017
Management Discussion & Analysis 2017
Form 40-F 2016
Management Discussion & Analysis 2016
Technical Report 2016
Management Discussion & Analysis 2014
Subscription required - Subscription is required.

News:

NewsDate
Fortuna reports 2020 full year production of 11.3 million silver equivalent ounces and issues 2021 guidance January 19, 2021
Fortuna announces resumption of production at the San Jose Mine, Mexico May 26, 2020
Fortuna provides an update on its response to the worldwide spread of COVID-19 April 2, 2020
Fortuna announces resumption of operations at its San Jose Mine in Oaxaca March 25, 2020
Fortuna reports illegal road blockades affecting its San Jose Mine in Oaxaca March 24, 2020
Fortuna provides review of Brownfields exploration programs February 14, 2019
Fortuna reports 2018 full year production of 12.8 million silver equivalent ounces and issues 2019 guidance January 17, 2019
Fortuna Silver Mines Updates Reserves and Resources February 22, 2018

Aerial view:

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