Overview
Stage | Production |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Cut & Fill
- Mechanized Cut & Fill
- Hydraulic backfill
|
Mine Life | 5 years (as of Jan 1, 2022) |
Caylloma is an underground silver, lead, and zinc mine. In 2022, Caylloma delivered higher annual silver and lead production due to higher throughput and head grades. |
Source:
p. 14,45
Since June 2005, the Caylloma Property has been 100 percent owned by Minera Bateas S.A.C., a Peruvian subsidiary of Fortuna Silver Mines Inc.
Contractors
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Deposit Type
- Epithermal
- Vein / narrow vein
Summary:
The Caylloma polymetallic and silver-gold rich veins are characteristic of a typical low sulfidation epithermal deposit according to the classification of Corbett (2002) having formed in a relatively low temperature, shallow crustal environment. The epithermal veins in the Caylloma District are characterized by minerals such as pyrite, sphalerite, galena, chalcopyrite, marcasite, native gold, stibnite, argentopyrite, and various silver sulfosalts (tetrahedrite, polybasite, pyrargyrite, stephanite, stromeyerite, jalpite, miargyrite and bournonite). These are accompanied by gangue minerals such as quartz, rhodonite, rhodochrosite, johannsenite (Mn-pyroxene) and calcite.
Veins in the Caylloma District show structural patterns and controls typical of other vein systems hosted by Tertiary volcanic rocks in the western Peruvian Andean range. The Caylloma District vein system was developed as a set of dilatational structures as a consequence of tension generated during the main compressional event of the Andes. Veins are persistent along strike and dip. Locally, veins are displaced by post-mineral faulting along a north-northwest bearing. Horizontal displacement along these faults is minor and ranges from centimeters up to a few meters. No significant vertical displacement is observed on the structures. The vein system is not affected by any folding.
Three types of hydrothermal alteration have been identified at the Caylloma Mine: (1) quartz- adularia; (2) ........

Mining Methods
- Cut & Fill
- Mechanized Cut & Fill
- Hydraulic backfill
Summary:
The mining method applied in the exploitation of the main vein (Animas) is overhand cut-and-fill using either mechanized, semi-mechanized or conventional extraction methods. All mining is undertaken by contractors in a southwest to northeast direction following the strike of the vein. Production capacity at the mine is 1,500 tpd. The following describes the cut-and-fill mechanized, semi-mechanized, and conventional extraction methods.
Mechanized cut-and-fill
Mechanized mining uses a jumbo drill rig and scoop tram for loading. The ore haulage is performed by trucks. Rock support is applied through rock bolts and shotcrete. The average mining width ranges between 3.5 m and 17 m. Mechanized mining is regarded as only being suitable for the Animas, Animas NE and their associated splays, as well as the Nancy vein based on the geological structure and geotechnical studies. Mechanized cut-and-fill comprises 93 % of mining planned in the LOM.
The mechanized mining sequence includes: drilling (with a jumbo drill rig), blasting, support, loading (with a scoop tram) and haulage.
Semi-mechanized cut-and-fill
Semi-mechanized mining is performed using handheld drilling equipment (jacklegs) and scoops for loading. Ore haulage is performed by truck. Rock support is supplied using rock bolts installed using manual drilling and installation techniques. Semi-mechanized mining is applied to narrow veins with average widths between 0.8 m and 2.0 m.
........

Source:

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Flow Sheet:
Summary:

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Production:
Commodity | Product | Units | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
Silver
|
Metal in concentrate
|
koz
| ...... ^ | ......  | ......  | ......  | ......  | 911 | 943 |
Lead
|
Metal in concentrate
|
M lbs
| ...... ^ | ......  | ......  | ......  | ......  | ......  | ......  |
Zinc
|
Metal in concentrate
|
M lbs
| ...... ^ | ......  | ......  | ......  | ......  | ......  | ......  |
Gold
|
Metal in concentrate
|
oz
| | ......  | ......  | ......  | ......  | ......  | ......  |
Silver Equivalent
|
Payable metal
|
oz
| | | | ......  | ......  | ......  | ......  |
Lead
|
Concentrate
|
kt
| | | | | | | |
Zinc
|
Concentrate
|
kt
| | | | | | | |
^ Guidance / Forecast.
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Operational Metrics:
Metrics | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 |
Daily milling rate
| ......  | ......  | ......  | 1,433 t | 1,488 t | 1,502 t |
Tonnes milled
| ......  | ......  | ......  | 510,047 t | 531,307 t | 534,773 t |
Daily mining capacity
| ......  | ......  | ......  | 1,430 t of ore | 1,430 t of ore | 1,430 t of ore |
Daily milling capacity
| ......  | ......  | ......  | | 1,500 t | 1,500 t |
^ Guidance / Forecast.
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Reserves at December 31, 2022:
Mineral Reserves for the Caylloma Mine are reported above NSR breakeven cut-off values based on underground mining methods including; mechanized (breasting) at US$86.60/t; mechanized (uppers) at US$77.33/t; semi-mechanized at US$90.19/t; and a conventional method at US$155.09/t; using assumed metal prices of US$21/oz Ag, US$1,600/oz Au, US$2,100/t Pb and US$2,600/t Zn; metallurgical recovery rates of 82% for Ag, 45% for Au, 88% for Pb and 89% for Zn.
Mineral Resources are reported at an NSR cut-off grade of US$65/t for veins classified as wide (Animas, Animas NE, Nancy, San Cristobal) and US$135/t for veins classified as narrow (all other veins) based on the same parameters used for Mineral Reserves, and a 15% upside in metal prices.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven & Probable
|
3,198 kt
|
Silver
|
81 g/t
|
8.3 M oz
|
Proven & Probable
|
3,198 kt
|
Gold
|
0.15 g/t
|
15 koz
|
Proven & Probable
|
3,198 kt
|
Lead
|
2.66 %
|
|
Proven & Probable
|
3,198 kt
|
Zinc
|
3.88 %
|
|
Measured & Indicated
|
2,839 kt
|
Silver
|
80 g/t
|
7.3 M oz
|
Measured & Indicated
|
2,839 kt
|
Gold
|
0.24 g/t
|
22 koz
|
Measured & Indicated
|
2,839 kt
|
Lead
|
1.64 %
|
|
Measured & Indicated
|
2,839 kt
|
Zinc
|
3.08 %
|
|
Inferred
|
5,003 kt
|
Silver
|
105 g/t
|
16.9 M oz
|
Inferred
|
5,003 kt
|
Gold
|
0.45 g/t
|
72 koz
|
Inferred
|
5,003 kt
|
Lead
|
2.23 %
|
|
Inferred
|
5,003 kt
|
Zinc
|
3.42 %
|
|
Source:

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Corporate Filings & Presentations:
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