Overview
| Stage | Residual leach |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
La Zanja consists of two-ore deposits in production in oxide material: San Pedro Sur and Pampa Verde.
Mining activities at the Pampa Verde pit will be paused during 2023 to focus on sulfide deposit exploration beneath the pit. However, leaching will continue at La Zanja’s San Pedro pad to the extent that this remains profitable.
Buenaventura has opted not to continue with Phase 5 exploitation for the time being despite Pampa Verde pit Phase 4 stripping completion. Phase 5 mining has been postponed due to OpEx inflationary pressure. |
Source:
p. 33
On February 08 of 2022, the acquisition by Buenaventura of 100% of the shares of Minera La Zanja as part of the agreement between Buenaventura and Newmont for Minera Yanacocha, was announced.
Minera La Zanja S.R.L. operates La Zanja mining unit. Minera La Zanja S.R.L. is 100 % owned by Buenaventura as of December 31, 2022.
Contractors
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Deposit Type
- Vein / narrow vein
- Epithermal
- Porphyry
Summary:
La Zanja is located within a large area of hydrothermal alteration, mainly related to epithermal gold deposits in high sulphidation environments, in addition to some bonanza Au vein epithermal systems, Cu-Au transitional epithermal-porphyry, and breccias pipe Cu-Au-Mo. There are two-ore deposits in production in oxide material: San Pedro Sur and Pampa Verde.
Epithermal gold mineralization in oxides associated with dome edges in San Pedro and Pampa Verde deposits. Additionally, several low and intermediate-sulfidation vein systems have been recognized on the periphery, as well as copper/molybdenum/gold mineralization related to porphyry-type systems.
Summary:
Mining is performed via open pit, for which there are currently two pits in exploitation: San Pedro Sur and Pampa Verde. The height of the operating benches is 6 m and 12 m for th final slope, with an angle ranging from 36° to 54°. Ore is transported directly to the San Pedro Sur leach pad, 3 km from the San Pedro Sur pit and 10 km from the Pampa Verde pit. The barren material is transported to deposits located near each open pit. The material is loaded using 3 m3 excavators, and hauled using trucks with a capacity of 20 m3.
During 2022, mining was focused on the Pampa Verde pit, between levels 3316 and 3508 4,336,273 DMT of ore with grades of 0.376 g/t of gold and 0.107 oz/t of silver were sent to the leach pad. Mining took place between January and October of 2022. The mining activities of phase IV of PV were completed on October 28 of 2022.
In the last two months of the 2022 year, the operating activities of the Unit focused and on exploring within the pit footprint so as to generate additional oxide reserves in the short term and to continue with the mining of Phase V of the Pampa Verde pit.
The operation is carried out with outsourced equipment, which includes loading equipment of 2.4–4.7 m3 and hauling equipment of 20-22 m3. The average material moved is 27.3 kilo tons per day.
Production in 2022 was significantly higher than in 2021 because of the operational focus on production since pre-stripping was already completed. Duri ........
Source:
Summary:
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Production:
| Commodity | Units | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
|
Gold
|
oz
| ...... | ...... | ...... | ...... | 71,630 | 127,118 | 139,724 |
|
Silver
|
oz
| ...... | ...... | ...... | ...... | ...... | ...... | ...... |
All production numbers are expressed as metal in doré.
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Operational Metrics:
| Metrics | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|
Daily mining rate
| ...... | ...... | 10 kt | | | |
|
Daily processing capacity
| ...... | ...... | | | | |
|
Tonnes processed
| ...... | ...... | 1,639,008 t | 1,577,645 t | 5,702,881 t | 10,694,942 t |
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Reserves at December 31, 2022:
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Measured & Indicated
|
11,390 kt
|
Gold
|
0.02 oz/t
|
218 koz
|
|
Measured & Indicated
|
11,390 kt
|
Silver
|
0.29 oz/t
|
3,351 koz
|
Corporate Filings & Presentations:
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