Source:
p. 4
The La Libertad Complex is held 100% by Calibre, through its Desarrollo Minero de Nicaragua, S. A. subsidiary.
Contractors
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Deposit Type
- Epithermal
- Vein / narrow vein
- Breccia pipe / Stockwork
Summary:
The epithermal gold-silver deposits at La Libertad and Pavón can be assigned to the low sulphidation subclass of deposits.
La Libertad Mine
Gold mineralization at La Libertad is contained within multiple vein systems emplaced along zones of extensional dilation within the district scale fault network described above. The most productive vein systems in the district to date include the northeast trending Mojón – Crimea, Santa María – Esmeralda, San Francisco – Los Angeles, San Juan – Mestiza systems, and the east-west trending Jabalí and Santo Domingo vein systems. The following provides a generalized description of mineralization in the Jabalí and Mojon – Crimea vein systems which have been the principal sources of production at La Libertad during the past 15 years.
The Jabalí vein system occurs along an east-west trending fault zone that has been traced on surface over a distance of more than six kilometres. To date, exploration drilling has tested more than 3,950 m of the Jabalí vein system. The vein system dips to the north, varying from 60° to 80° north. Mineral Resources have been developed in the near surface Jabalí Antena open pit and Jabalí West underground mines, which are the primary sources of current production at La Libertad.
Gold mineralization occurs primarily as electrum in association with pyrite and lesser sphalerite within massive to banded quartz veins, vein stockworks and localized breccias developed along the east-we ........
Mining Methods
- Longitudinal open stoping
- Truck & Shovel / Loader
- Sub-level stoping
- Longhole open stoping
- Avoca
- Cemented backfill
Summary:
Open Pit Operations
At the La Libertad Complex, Calibre has two open pit mines currently in operation, three that are planned to be developed within the next two years. Jabalí Antena and Rosario are situated at La Libertad, Pavón Norte and Pavón Central are located at Pavón, EBP-GV is situated at the EBP. Mill feed material from Pavón and EBP is trucked to the La Libertad processing plant.
La Libertad Mine - Jabalí Antena
Jabalí Antena is an existing open pit gold mine. Mining at Jabalí Antena is carried out using a conventional open pit truck and shovel mining methods with a total production schedule of 145,000 t of ore and 0.9 Mt of waste to be mined in 2022 and 2023 for Phase 2 (East Extension). The open pit has been designed in two phases, with Phase 1 already completed in 2020, and mining of Phase 2 (East Extension) scheduled to commence in H2 2022 and completed by the end of 2023. In compliance with a local community permitting requirement, the East Extension pit limit has been constrained and only weathered material is scheduled to be mined, excluding drilling and blasting hard rock material on the west side of the pit.
The Jabalí Antena pit design criteria were based on a conventional surface mine operation 5.0 m3 backhoe excavators, and haulage by a fleet of 40 t capacity trucks. Jabalí Antena is operated by a mining contractor. A ramp width of 10.0 m has been selected for the operation of 40 t trucks.
Design ........
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Flow Sheet:
Summary:
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Production:
On October 15, 2019, Calibre acquired B2Gold’s interest in the El Limon and La Libertad gold mines, the Pavon gold project and additional mineral concessions in Nicaragua.
| Commodity | Units | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
|
Gold
|
oz
| ...... | ...... | ...... | ...... | 80,963 | 82,337 | 132,431 |
All production numbers are expressed as metal in doré.
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Operational Metrics:
| Metrics | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|
Annual milling capacity
| ...... | ...... | 2.25 Mt | 2.25 Mt | | |
|
Tonnes milled
| ...... | ...... | 1,301,076 t | 2,139,104 t | 2,250,687 t | 2,161,917 t |
|
Daily milling capacity
| ...... | ...... | | | | |
|
Ore tonnes mined
| ...... | ...... | 1,129,479 t | | | |
|
Waste OP
| ...... | ...... | 4,670,923 t | | | |
|
Total tonnes mined
| ...... | ...... | 5,800,402 t | | | |
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Reserves at December 31, 2022:
Open pit Mineral Reserves are estimated at the following cut-off grades:
• 0.79 g/t Au for Jabalí Antena OP.
• 0.74 g/t Au for Rosario OP.
• 1.51 g/t Au for Pavón Norte OP and Pavón Central OP.
• 1.81 g/t Au for EBP (Guapinol OP and Vancouver OP).
Underground Mineral Reserves are estimated at fully costed and incremental cut-off grades of 2.75 g/t Au and 1.65 g/t Au, respectively, for Jabalí West UG and 3.42 g/t Au and 2.41 g/t Au for Riscos de Oro UG.
Mineral Resources are estimated at gold cut-off grades ranging from 0.42 g/t to 3.59 g/t.
| Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
|
Probable
|
In-Situ (OP)
|
1,565 kt
|
Gold
|
5.4 g/t
|
272 koz
|
|
Probable
|
In-Situ (UG)
|
967 kt
|
Gold
|
4.89 g/t
|
152 koz
|
|
Probable
|
Total
|
2,556 kt
|
Gold
|
5.18 g/t
|
426 koz
|
|
Probable
|
In-Situ (OP)
|
1,565 kt
|
Silver
|
12.7 g/t
|
639 koz
|
|
Probable
|
In-Situ (UG)
|
967 kt
|
Silver
|
64.8 g/t
|
2,015 koz
|
|
Probable
|
Total
|
2,556 kt
|
Silver
|
32.3 g/t
|
2,654 koz
|
|
Indicated
|
In-Situ (OP)
|
2,592 kt
|
Gold
|
4.31 g/t
|
359 koz
|
|
Indicated
|
In-Situ (UG)
|
878 kt
|
Gold
|
6.8 g/t
|
192 koz
|
|
Indicated
|
Total
|
3,493 kt
|
Gold
|
4.92 g/t
|
552 koz
|
|
Indicated
|
In-Situ (OP)
|
2,592 kt
|
Silver
|
12.3 g/t
|
1,028 koz
|
|
Indicated
|
In-Situ (UG)
|
878 kt
|
Silver
|
103 g/t
|
2,909 koz
|
|
Indicated
|
Total
|
3,493 kt
|
Silver
|
35.1 g/t
|
3,937 koz
|
|
Inferred
|
In-Situ (OP)
|
3,315 kt
|
Gold
|
2.94 g/t
|
313 koz
|
|
Inferred
|
In-Situ (UG)
|
3,118 kt
|
Gold
|
4.39 g/t
|
440 koz
|
|
Inferred
|
Total
|
6,433 kt
|
Gold
|
3.64 g/t
|
753 koz
|
|
Inferred
|
In-Situ (OP)
|
3,315 kt
|
Silver
|
9.11 g/t
|
971 koz
|
|
Inferred
|
In-Situ (UG)
|
3,118 kt
|
Silver
|
75 g/t
|
7,517 koz
|
|
Inferred
|
Total
|
6,433 kt
|
Silver
|
41 g/t
|
8,488 koz
|
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