Name: Coimolache mine.
Location: The mine is located in the districts of Hualgayoc and Chugur, in Hualgayoc, Cajamarca, Peru.
Controlling Company: Compañía Minera Coimolache, in which Buenaventura owns a 40.1% share.
Brief Description: Coimolache is an openpit gold operation. Mining is conducted in the Tantahuatay 2 and Ciénaga Norte pits.
All production at Coimolache is turned into gold and silver doré, which are later sold.
Brief History: Operations at Coimolache started in 2011.
Products: Gold and silver.
Geology/Mineralisation: Coimolache is a high-sulphidation epithermal deposit, with outcropping gold and silver mineralisation in oxides, connected to silicified breccia associated with a pervasive siliceous alteration.
Below the oxides level, there is mineralisation comprising predominantly arsenical copper and, to a lesser extent, covellite and supergene chalcocite. This epithermal event overprints a skarn, with retrograde alteration identified at depth, with clean copper mineralisation.
Reserves: Total proven and probable reserves as at December 31, 2017, were estimated at 68.1-million tonnes grading 0.012 oz/TMS gold and 0.23 oz/TMS silver.
Mining Method: Openpit.
Major Infrastructure and Equipment: Run-of-mine ore, obtained from blasting in the openpit, is leached using cyanide solution. Two processes are conducted in the plant: Merrill-Crowe (zinc precipitation), and adsorption, desorption and regeneration using activated carbon.
Prospects: Coimolache signed a contract with Cerro Corona (Gold Fields) to buy oxide material in February 2018. Based on this agreement, the mine will buy 6.6-million tonnes of ore over three years.
Contact: Buenaventura corporate communications Diego Uceda Noguerol.
Contact Details:
Tel +511 419 2500
Email comunicacion.corporativa@buenaventura.pe
Website http://www.buenaventura.com