Mining and processing at the Usak province gold mine

Published: Sep 26,2011 11:50:57


Drilling and blast mining methods are used to recover ore from the open pit mine. Hitachi hydraulic shovels excavate the ore and load them onto Caterpillar dump trucks and front-end loaders. About ten haul trucks operate at the mine.


Heap leaching method is used to process the run-of-mine ore. The mined ore is passed through a three stage crushing system consisting of a gyratory crusher and four cone crushers supplied by Metso Minerals. The crushers reduce the ore to 80% and to a size of 6.3mm for leaching.


Crushed ore is then transferred to the heap leach pad through conveyors in 10m lifts. Several portable conveyors and a radial stacker transfer the ore onto the pad. The heap leach pad consists of two liner systems - a layer of low permeability clay soil and a 2mm thick synthetic liner.


Leached ore is sent to the carbon adsorption plant (ADR) to recover gold. The ADR plant features two trains of carbon columns containing five columns each.


Gold from the leach pad is treated with activated carbon and periodically removed for treatment. The Zadra process consisting of pressure stripping, electro winning and smelting is used to recover gold from the carbon. The final product is a gold bar which can be processed to 99.999% purity.


SOURCE:mining teachnology


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