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Mexico
San Jose Mine

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 Location:
40 km S from Oaxaca, Oaxaca, Mexico
  Address:
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
  • Sub-level stoping
  • Room-and-pillar
  • Paste backfill
  • Dry waste backfill
Production Start...
Mine Life2 years (as of Jan 1, 2022)
On January 5, 2023, the Company announced that it had received notice of a resolution from the Secretaría de Medio Ambiente y Recursos Naturales (“SEMARNAT”) which provides that SEMARNAT has annulled and is re-assessing the 12- year extension to the environmental impact authorization (“EIA”) for the San Jose Mine that it had granted to Cuzcatlan in December 2021.

Cuzcatlan initiated legal proceedings in the Mexican Federal Administrative Court to contest and revoke the annulment of the EIA. The Court has admitted the Mexican Legal Proceedings, and on March 10, 2023, Minera Cuzcatlan received notice that the Court has granted it a permanent injunction which allows the San Jose Mine to continue to operate under the terms of the 12-year EIA until the determination of the Mexican Legal Proceedings.
Latest NewsFortuna receives positive decision from Mexican Court which reinstates the San Jose Mine environmental impact authorization     October 30, 2023

Owners

Source: p. 14,45
CompanyInterestOwnership
Fortuna Silver Mines Inc. 100 % Indirect
The San Jose underground mine is operated by Compania Minera Cuzcatlan S.A. de C.V., a Mexican subsidiary 100 percent owned by Fortuna.

Contractors

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Deposit Type

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

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 mineralized structural corridor extends for greater than 3 km in a north–south direction and has been divided into two sectors. The Trinidad Deposit area located between 1846500N and 1847800N, and the San Ignacio area located between 1845000N and 1846500N. The Victoria mineralized zone is located approximately 350 m to the east of the Trinidad Deposit.

The major mineralized structures or vein systems recognized in the Trinidad Deposit area are the Trinidad and Bonanza structures and the Stockwork zones. In addition to the major mineralized structures, secondary vein systems are present between the Trinidad and Bonanza systems and locally in the hanging wall to the Bonanza system and also in the footwall to the Trinidad system. To-date, drillin ........

Mining Methods

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

Summary:

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 c ........

Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.

^ Guidance / Forecast.

Production:

CommodityProductUnits2023202220212020201920182017
Silver Metal in concentrate koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required7,9807,527
Gold Metal in concentrate koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent Payable metal oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Concentrate kt
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202320222021202020192018
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required2,647 t3,028 t2,956 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required934,381 t1,068,722 t1,040,478 t
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required3,000 t3,000 t
Daily mining capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required3,000 t of ore3,000 t of ore3,000 t of ore
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at December 31, 2022:
Mineral Reserves for the San Jose Mine are based on underground mining within optimized stope designs using an estimated NSR break-even cut-off grade of US$68.7/t to US$74.0/t equivalent to 119 -133 g/t Ag Eq based on assumed metal prices of US$21/oz Ag and US$1,600/oz Au.

Mineral Resources are reported at a 110 g/t Ag Eq cut-off grade based on the same parameters used for Mineral Reserves and a 15% upside in metal prices.

CategoryTonnage CommodityGradeContained Metal
Proven 184 kt Silver 208 g/t 1.2 M oz
Proven 184 kt Gold 1.45 g/t 9 koz
Probable 1,957 kt Silver 168 g/t 10.6 M oz
Probable 1,957 kt Gold 1.14 g/t 72 koz
Proven & Probable 2,140 kt Silver 172 g/t 11.8 M oz
Proven & Probable 2,140 kt Gold 1.16 g/t 80 koz
Measured 72 kt Silver 135 g/t 0.3 M oz
Measured 72 kt Gold 0.98 g/t 2 koz
Indicated 839 kt Silver 107 g/t 2.9 M oz
Indicated 839 kt Gold 0.7 g/t 19 koz
Measured & Indicated 911 kt Silver 109 g/t 3.2 M oz
Measured & Indicated 911 kt Gold 0.72 g/t 21 koz
Inferred 2,524 kt Silver 118 g/t 9.6 M oz
Inferred 2,524 kt Gold 0.83 g/t 67 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Total cash costs (sold) Silver Equivalent USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total cash costs Silver Equivalent USD  ......  Subscription required  ......  Subscription required 5.93 / oz   6.1 / oz  
Total cash costs Silver USD 0.69 / oz†   0.95 / oz†  
All-in sustaining costs (sold) Silver Equivalent USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All-in sustaining costs (AISC) Silver Equivalent USD  ......  Subscription required  ......  Subscription required 9.02 / oz   10.1 / oz  
All-in sustaining costs (AISC) Silver USD 5.45 / oz†   7.11 / oz†  
All-in costs Silver Equivalent USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 9.03 / oz   10.1 / oz  
All-in costs Silver USD 5.47 / oz†   7.12 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
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Operating Costs:

Units20222021202020192018201720162015
UG mining costs ($/t milled) USD 37.4  38.7  36  36.3  30.9  32.5  30.4  
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  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 required - Subscription is required.

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 9.3   18,385  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 16.2   24.8  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 180.2   180  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 57.9   65.2  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 59   55.3  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 40.5   44.4  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 92.2   99.9  
Subscription required - Subscription is required

Water Supply
Source: Subscription required

- subscription is required.

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

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 18, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 18, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Press Release 2023
Year-end Mineral Reserves 2023
Corporate Presentation 2022
Financial Review 2022
Management Discussion & Analysis 2022
................................... Subscription required 2021
................................... 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 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Financial Review 2018
Management Discussion & Analysis 2018
Press Release 2018
Sustainability Report 2018
Corporate Presentation 2017
Management Discussion & Analysis 2017
Form 40-F 2016
Management Discussion & Analysis 2016
Technical Report 2016
Management Discussion & Analysis 2014
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News:

NewsDate
Fortuna receives positive decision from Mexican Court which reinstates the San Jose Mine environmental impact authorization October 30, 2023

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