The Bozymchak deposits were generated by intrusion of a large granitoid stock with pinkish-grey porphyritic granites of the Dzhalgyzuriuk massif into carbonate cauntry rocks of Devonian and Carboniferous age. Devonian sediments are polymict clastics, calcareus sandstones and limestones of Frasnian-Famennian age. Carboniferous sediments are sandstones and limestones, sometimes siliceous and bituminous, of Tournaisian-Visean age and pyroclastic sedimentary rocks (andesitic and dacitic tuffs) of mid- Carboniferous age.

Mineralization is generally in skarn zones, in the form of disseminated sulphides with associated gold. The major sulphide component is chalcopyrite with lesser bornite and covellite; there is some rare presence of sphalerite and arsenopyrite. Surface oxide mineralization is only weakly developed and is primarily marked by the occurrence of malachite. The skarn mineralization is of garnet-wollastonite and garnet-pyroxene types; metamorphosis of limestone and dolomite has occurred locally to form marble and siliceous limestone. The thickness of the skarn horizon varies from a minimum of around 7 m up to 85 m.

To the east of the main central deposit sulphide zones are found which contain chalcopyrite, pyrite and pyrrhotite, with, in this zone, serpentinites which are the products of alteration of pyroxenite; some fibrous asbestos is also found.

The Bozymchak deposit comprises four sectors separated as discrete areas by faulting:
- South-western sector;
- Central sector;
- Eastern sector;
- Davan sector.

In the Central sector the skarn horizon occurs along a bow-shaped strike along the contact of country rock and the intrusion, along a 2 km strike with dip to the south of between 75-86 degrees.

The dimensions of the final pit is 350 m deep, 700m long and 300m wide, the main benches are 30 m with sub benches at the 10 m giving a total of 12 benches.

The selected plant design is conventional and generally well considered. Ore is delivered by truck or front and loader to fixed grizzly above a bunker that is discharged by an apron feeder that feeds a vibrating grizzly from which the oversize feed the TST 1200 primary jaw crusher. Vibrating grizzly undersize and the primary crushed product is conveyed to a vibrating screen from which the oversize discharges into the sarge bin ahead of the secondary crusher. A belt feeder under the sarge bin feeds the XL 300 secondary coner crusher and the vibrating screen undersize joins the secondary crushed product and the tertiary crushed product on a conveyor to another vibrating screen. The oversize from the second vibrating screen is conveyed back to the two XL 300 tertiary cone crushers. The second vibrating screen undersize at 80% passing 7.7 mm, is conveyed to a 50 m diameter stockpile. This provides ore for the mill for 72 hours to allow time for repair and relining of the crushers.

At Bozymchak produce copper concentrate which also contains gold and silver content as by-products. The copper concentrate from the Bozymchak is toll processed at the Balkhash smelter into finished products of copper cathode, gold bars and silver bars.

Fine ore is drawn by apron feeders under the stockpile to two parallel conveyor, each feeding a 3.7 m diameter, 7.2 m long ball mill with a 1600 kW motor at about 65 tph. The mills operate closed circuit with hydrocyclones with a 350% re-circulating load. The cyclone overflow at a particle size of 80% passing 52 microns and a pulp density of 30% w/w solids gravitate to rougher flotation in five 20 m3 flotation cells.

The rougher concentrate is cleaned in two 4 m3 cells and the cleaner concentrate is re-cleaned in one 4 m3 cell. The rougher tailing is scavenged in six 20 m3 cells. The scavenger concentrate returns to the head of the flotation circuit, while the scavenger tailing is the final tailing. Two complete flo ........