INVESTIGATION OF LEAVE LEVEL OF COPPER ORE OF ZHEZKAZGAN DEPOSIT

In the conditions of the Zhezkazgan copper deposit, which is worked underground, the losses of ore in the left pillars fluctuate from 12 to  25 %, sometimes reaching 40%. During the development of the  Zhezkazgan deposit, tens of millions of tons of rich ore were left in  various kinds of losses. The annual increase in ore losses in various  parts, taking into account the increasing production, is  approximately equal to the annual productivity of the whole mine.  Also in the production process so far rich in content of the interlayer  copper ores of low power. Therefore, the search for the most  effective methods of mining lost, off-balance and waste ores is of  paramount importance. One of such methods is underground  leaching, which allows to carry out their secondary development and make maximum use of the mineral wealth. The aim of the research  was to experimentally study the leaching of oxidized, mixed and  sulphide copper ores of the old spent mines in the Zhezkazgan deposit using various solvents. The squeezing of oxide  and sulphide rudes was carried out in 2 stages, when the durability  of the experimental crests was 35 hours and the durable 294 hours.  The oxidant-sulphide ore is 20 mm high and can be cured at 50-80  % media, for 10 months. For the period of time, the chalcocin rudus  is derived from 30 to 50 % of media, and from 5 to 12 % of bernital  chalcopyrite, which results in the effectiveness of the subsequent  method of squeezing the effluent. The best dissolves are acidic acid  (5-10 g/l) and acidified sulphate oxide (5 g/l). Residual cystic acid  production and development of oxidant processes up to 1.6-3.2 t/t  for medium oxidized rudder and up to 2.54.1 t/t for chalcocin rudder, which acts as a catalyst for thawing technical and economic indicators.