Overview
Status | Temporary Suspension |
Mine Type | Open Pit |
Commodities |
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Mining Method |
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Production Start | ... |
Mining activities at San Bartolomé were suspended in Q3 2023.
Prior to suspension of mining activities, the Andean extracted material and process mineralized Pallacos from the Santa Rita, Huacajchi and Antuco sectors.
The Andean anticipates no further mining of Pallacos, as the Andean has completed the transition from mining nearly depleted, Pallacos to processing fines disposal facility (FDF) material and third-party purchases.
Work is progressing as planned for the construction of the FDF tailings silver recovery project, which is expected to be completed in the first half of 2024.
The transition to processing company required in adopting new metrics of Cash gross operating margin (CGOM) per equivalent ounces as opposed to a fixed Operating cash cost (OCC) and AISC numbers starting as from January 1, 2024. |
Latest News | Andean Precious Metals Reports Q4/FY 2023 Results; Meets 2023 Revised Production Guidance March 27, 2024 |
Source:
p. 10
The Andean Precious Metals Corp. owns a 100% interest in, through direct and indirect interests, Empresa Minera Manquiri S.A. (Manquiri) which is the operator of the San Bartolomé mine and processing facility.
Contractors
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Deposit Type
- Tailings
- Vein / narrow vein
- Breccia pipe / Stockwork
Summary:
The silver-bearing mineral deposits are alluvial and colluvial, unconsolidated sediments (the pallacos flanking Cerro Rico), high sulfidation deposits (Tollojchi) and intermediate sulfidation deposits (Alta Vista and Paca). The pallacos also contain tin. Cerro Rico is a prominent +4,700 meter (m) elevation mountain.
San Bartolomé
The mineral deposits at Cerro Rico are the source of the San Bartolomé pallacos and were formed by erosion and downslope accumulation of the in situ high sulfidation, epithermal deposits at Cerro Rico, composed of veins, stockworks, hydrothermal breccias and irregular bodies, hosted in a very altered resurgent dome of dacitic- to rhyodacitic-composition porphyritic intrusion emplaced in Middle Miocene time (approx. 14 mya). These deposits consist of an unsorted mixture of cobbles and boulders in a sandy clay matrix, accumulated down slope by colluvial and alluvial processes, filling depressions, gullies and low-gradient areas. The deposits have been grouped into three areas named Antuco, Huacajchi and Santa Rita. As of 1 December 2023, the pallacos had been nearly depleted.
Alta Vista
Mineralization at Alta Vista is hosted in epithermal veins of intermediate sulfidation character. Mineralization is controlled by multiple, epithermal veins with the main, Veta Rica vein. Gangue mineralization at Alta Vista consists largely of quartz and Fe-Mn oxides with lesser amounts of alunite and other alteration minerals.
Summary:
Mining activities at San Bartolomé were suspended in Q3 2023. Prior to suspension of mining activities, the Andean extracted material and paid production royalties to COMIBOL, the state-owned mining company. Pursuant to a production agreement, the Andean paid production royalties to COMIBOL in return for the rights to mine, transport and process mineralized Pallacos from the Santa Rita, Huacajchi and Antuco sectors.
The Andean anticipates no further mining of Pallacos, as the Company has completed the transition from mining its nearly depleted, high cost Pallacos to processing its lower cost fines disposal facility (FDF) material and third party purchases.
Mining of the pallacos at San Bartolomé has been conducted with shallow open pit methods using dozers, and backhoe or loaders and transports the material to the processing facility by truck (Birak et al, 2020). No drilling or blasting is needed to extract these unconsolidated, mineralized deposits (gravels).
San Bartolomé mined the pallaco alluvial deposits from the slopes of Cerro Rico and sent the untreated mineralized fines to the FDF tailings to raise the silver grade going into the plant.
These tailings were found to be of economic grade and will be reprocessed hydraulically using submersible pumps on a dredging pontoon that will pump the mineralized portion back to the plant.
San Bartolomé will also continue to add third-party contracted oxide ores from nearby mi ........
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Flow Sheet:
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Pipelines and Water Supply
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Reserves at December 1, 2023:
Mineral reserves are reported at an in-situ cut-off of 50 g/t Ag, grade of material above mesh #14.
Mineral resources are reported at an in-situ cut-off of 47 g/t Ag, grade of material above mesh #14.
Mineral Resources are reported inclusive of Mineral Reserves.
Category | OreType | Tonnage | Commodity | Grade | Contained Metal | Recoverable Metal |
Probable
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Tailings
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3.27 kt
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Silver
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58 g/t
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6.09 M oz
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4.75 M oz
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Indicated
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Tailings
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3,813 kt
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Silver
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56 g/t
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6.9 M oz
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Inferred
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Tailings
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92 kt
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Silver
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52 g/t
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0.15 M oz
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