Overview
| Stage | Production |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
- Overhand Cut & Fill
- Room-and-pillar
- Paste backfill
- Dry waste backfill
|
| Production Start | ...  |
| Mine Life | 3 years (as of Jan 1, 2021) |
On December 20, 2021 the Fortuna resolved an outstanding permit issue at the San Jose mine and received approval for the extension of its Environmental Impact Authorization (“EIA”). The extension of the EIA provided the Company with access to the full $200.0 million of the Amended Credit Facility. |
| Latest News | Fortuna provides update on San Jose’s Environmental Impact Authorization January 25, 2023 |
Source:
p. 14,15,52
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
- 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 ........
Source:
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Flow Sheet:
Summary:
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Production:
| Commodity | Product | Units | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
|
Silver
|
Metal in concentrate
|
koz
| ...... ^ | ...... | ...... | ...... | 7,980 | 7,527 | 6,124 |
|
Gold
|
Metal in concentrate
|
koz
| ...... ^ | ...... | ...... | ...... | ...... | ...... | ...... |
|
Silver Equivalent
|
Payable metal
|
oz
| | | ...... | ...... | ...... | ...... | |
|
Silver
|
Concentrate
|
kt
| | | | | | | |
^ Guidance / Forecast.
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Operational Metrics:
| Metrics | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|
Tonnes milled
| ...... | ...... | ...... | 1,068,722 t | 1,040,478 t | 1,070,790 t |
|
Daily milling rate
| ...... | ...... | ...... | 3,028 t | 2,956 t | 3,044 t |
|
Daily mining capacity
| ...... | ...... | ...... | 3,000 t of ore | 3,000 t of ore | |
|
Daily milling capacity
| ...... | ...... | ...... | 3,000 t | 3,000 t | 3,000 t |
^ Guidance / Forecast.
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Reserves at December 31, 2021:
Proven and Probable Reserves are reported at a 111 to 122 g/t Ag Eq cut-off grade and Inferred Resources are reported at a 100 g/t Ag Eq cut-off grade.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Proven
|
75 kt
|
Silver
|
205 g/t
|
0.5 M oz
|
|
Proven
|
75 kt
|
Gold
|
1.4 g/t
|
3 koz
|
|
Probable
|
2,914 kt
|
Silver
|
180 g/t
|
16.8 M oz
|
|
Probable
|
2,914 kt
|
Gold
|
1.17 g/t
|
109 koz
|
|
Proven & Probable
|
2,989 kt
|
Silver
|
180 g/t
|
17.3 M oz
|
|
Proven & Probable
|
2,989 kt
|
Gold
|
1.17 g/t
|
113 koz
|
|
Measured
|
38 kt
|
Silver
|
121 g/t
|
0.2 M oz
|
|
Measured
|
38 kt
|
Gold
|
0.82 g/t
|
1 koz
|
|
Indicated
|
901 kt
|
Silver
|
98 g/t
|
2.8 M oz
|
|
Indicated
|
901 kt
|
Gold
|
0.65 g/t
|
19 koz
|
|
Measured & Indicated
|
940 kt
|
Silver
|
99 g/t
|
3 M oz
|
|
Measured & Indicated
|
940 kt
|
Gold
|
0.66 g/t
|
20 koz
|
|
Inferred
|
3,011 kt
|
Silver
|
125 g/t
|
12.1 M oz
|
|
Inferred
|
3,011 kt
|
Gold
|
0.93 g/t
|
90 koz
|
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