Overview
| Stage | Production |
| Mine Type | Open Pit & Underground |
| Commodities |
|
| Mining Method |
- Longitudinal open stoping
- Truck & Shovel / Loader
- Sub-level stoping
- Longhole open stoping
- Avoca
- Cemented backfill
|
| Production Start | ...  |
| Mine Life | 2028 |
The La Libertad Complex consists of two operating mine sites, La Libertad and Pavón, delivering mill feed to the 6,200 tpd La Libertad processing plant and the Eastern Borosi Project, an early development stage project.
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.
The La Libertad Complex operation includes two underground mines, the currently operating Jabalí West mine at Libertad and the early development stage Riscos de Oro mine at the EBP. |
Source:
p. 4
The La Libertad Complex is held 100% by Calibre, through its Desarrollo Minero de Nicaragua, S. A. (DESMINIC) 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 ........
Source:
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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 (collectively, the “Nicaragua Assets”).
| Commodity | Units | 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 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
|
Tonnes milled
| ...... | ...... | 2,139,104 t | 2,250,687 t | 2,161,917 t | 2,277,795 t |
|
Daily milling capacity
| ...... | ...... | | | | 6,250 t |
|
Annual milling capacity
| ...... | ...... | 2.25 Mt | | | |
|
Ore tonnes mined
| ...... | ...... | | | | |
|
Waste
| ...... | ...... | | | | |
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Reserves at December 31, 2021:
Mineral Resources are estimated at gold cut-off grades from 0.69 g/t to 3.59 g/t, except at Blag and East Dome, which are estimated at a gold equivalent (AuEq) cut-off grade of 2.00 g/t, and La Luna OP which is estimated at a gold equivalent (AuEq) cut-off grade of 0.42 g/t.
Underground Mineral Reserves are estimated at fully costed and incremental cut-off grades of 2.75 g/t Au and 1.95 g/t Au, respectively, for Jabalí West and 3.42 g/t Au and 2.41 g/t Au for Riscos de Oro.
Open pit Mineral Reserves are estimated at a cut-off grade of 0.79 g/t Au for Jabalí Antena 0.74 g/t Au for Rosario, and 1.27 g/t Au for Pavón Norte and Pavón Central, and 1.81 g/t Au for the EBP.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Probable
|
3,173 kt
|
Gold
|
4.75 g/t
|
485 koz
|
|
Probable
|
3,173 kt
|
Silver
|
26 g/t
|
2,650 koz
|
|
Measured
|
168 kt
|
Gold
|
4.32 g/t
|
23 koz
|
|
Measured
|
168 kt
|
Silver
|
13 g/t
|
71 koz
|
|
Indicated
|
3,950 kt
|
Gold
|
4.79 g/t
|
608 koz
|
|
Indicated
|
3,950 kt
|
Silver
|
30.8 g/t
|
3,914 koz
|
|
Measured & Indicated
|
4,118 kt
|
Gold
|
4.77 g/t
|
631 koz
|
|
Measured & Indicated
|
4,118 kt
|
Silver
|
30.1 g/t
|
3,985 koz
|
|
Inferred
|
6,327 kt
|
Gold
|
3.57 g/t
|
726 koz
|
|
Inferred
|
6,327 kt
|
Silver
|
40.9 g/t
|
8,300 koz
|
Process water supply totalling 1,450 gallons per minute (gpm) from a variety of sources on the site.
Corporate Filings & Presentations:
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