Arcata
Phase: Operations
Mine Type: Underground
The Arcata is located in the Department of Arequipa in southern Peru, approximately 300 kilometres from the city of Arequipa, on a 47,000 hectare site, at an altitude of 4,600 metres above sea level.
History:
The development and preparation of the Arcata mine began in 1961, and the first concentrate was obtained in 1964.
Regional geology:
Tertiary Volcanic Belt
The volcanic belt has been developed on top of older, mainly sedimentary, Paleozoic and Mesozoic units, which in general lie to the southwest and northeast of the volcanic belt. Northwest-trending, beltparallel zones of Cretaceous to Tertiary age felsic intrusives lie to the southwest and northeast of the central part of the Tertiary Volcanic Belt.
Dominant structural trends are northeast, northwest and to a lesser extent north-south. Base metal mineralization generally occurs associated with the intrusives as porphyry and a skarn-type mineralization. Gold-silver mineralization, usually of the high or low sulphidation epithermal type, tends to occur within a northwest-trending, belt-parallel zone, centrally located in the Tertiary Volcanic Belt. Examples are the Madrigal, Caylloma,
Suckuytan, Orcopampa, Poracota, Ares and Arcata mines and prospects to the south, and Santa Rose and Selene to the northwest of Liam.
Regional Geology, Depertment of Cusco:
Local geology:
The Arcata mine is conformed by vein systems where the epithermal vein deposits are of an intermediate sulphidation type with predominant silver values and variable quantities of gold and base metals. The main structures at Arcata are Mariana NE, Blanca, Amparo, Ramal Leslie, Alexia and Marion. The known structures at Arcata extend over 29 kilometres.
Arcata map:
Mineral Resources (Dec. 31, 2018)
| Class | Ore (ktonnes) | Au grade (g/t) | Au (kg) | Au (oz * 1000) | Ag grade (g/t) | Ag (kg) | Ag (oz * 1000) |
|---|---|---|---|---|---|---|---|
| Measured | 834.00 | 1.35 | 1125.90 | 36.10 | 438.00 | 365292.00 | 11700.00 |
| Indicated | 1304.00 | 1.36 | 1773.44 | 56.90 | 411.00 | 1773.44 | 17200.00 |
| Inferred | 3533.00 | 1.26 | 4451.58 | 142.60 | 371.00 | 1310743.00 | 42100.00 |