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Gold exploring, mining, selecting and smelting ーGold-exploring― Zhaoyuan people have a lot of experience in gold exploring and make great contribution to gold exploring and enlarging the reserves of gold. During the period of the ^Ninth Five-year Plan for Modernization ̄, Zhaoyuan people have opened a new road for themselves to explore gold, which is the process of ^Scientific Examination-Exploring-Exploiting ̄ and have carried out ^30,100 ̄plan, that is, 30 items research to the mined gold and the predicated new reserves of gold is 100tons. During this period, the capitals for gold-exploring totals 110,720 thousand Yuan, 156 km of gallery has been completed, and the newly-added reserves of gold is 112.98ton,that is, more than 20ton/year. ーGold-mining―M ore than 2000 years ago, there have historical records from Song dynasty (976A.D.--1276A.D.). The mining way has changed a lot from axes made of stone and wooden chisel to steel needles, irony-hammer at present, then mechanical working, automatic control and modernized-exploring in current time. The developing technology of the ore deposits are advanced, the developing depth reaches 700m, the producing ability has totaled 13000ton/d in 2002 and the number of minerals is 4,000,000tons. ーGold-selecting―The tende ncy of gold selecting is a-large-scale and modernization and adopted automatic-control technology. The process of gold selecting is reasonable and advanced with the international standards. The treating-ability of mining area reaches 14,000tons per day, the biggest ball mill 2500tons per day, the number of gold-mineral-selecting 4,140,900tons in 2002, the rate of recovery 95.21%and the output 14365.637kg. The gold selecting equipment and installation develop with gold-manufacture and processing, and there are four big gold-dressing machine factory which can offer a set of gold-dressing and processing equipment and installation for the factory whose treating ability reaches 2000ton per day. ーGold smelting― Zhaoyuan has 5 related enterprises of smelting and processing of gold cyaniding, undertaking the task of smelting and processing of concentrated gold and purchasing concentrated gold and materials abundant with gold to smelt and process both at home and abroad. The technology Roast cyanidings, cyaniding roast to make acid, complicated two of minerals roast with complicated composition draw gold, silver, etc. expanding the using scope of the smelting and processing of the complicated element concentrated gold and the materials abundant with gold, and increasing the variety and output of the byproducts. The wet smelting technology fills in the domestic blank, reach the advanced international standards, and it is another revolution in the history of the gold smelting. In 2002, the whole city smelts 23566. 56 kg,s of gold, with the smelting rate of recovery 99. 65%.
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