Deposit Mathematics - Economic Model "package Development And Its Yuanjiang Gold

The thesis research item is taken from Yunnan Province and China Academy cooperative Project ?Research on gold exploiting plan and reserves increasing of Yunnan Province (Item serial Number: YK98008-3). Using geostatistics theory, a set of new deposit mathematic-eeonomical modeling software has been exploited. The software had been employed by modeling on Yuanjiang gold deposit, Optimizing the industrial targets and recalculating reserves, had increased gold reserves for about 10 tons, which prolongs, which prolongs used mineral time and provides basis for making good use of mineral resource, reducing waste and environmental pollution. Geostatistics has been a new borderline-cross subject for forty years and has a very wide developmental prospect. It has been used very well in several large mines since its introduction in 1977 in China. But the old geostatistics software, developed in the 1970's and run on the lower platform of software and hardware, hasn't matched current computer technology, and this makes it hard to generalize and apply geostatistics in our country. Aiming at all above problems, on the basis of summarizing systemically the theory and development of geostatistics, this software is exploited with the theory and method of geostatistics and advanced programming language-Visual Basic as developing tool. The new software can run on the Windows 95(98 or high edition) platform. And it has more advantages of Chinese-interface that can be operated and learned more easily than the old one. It functions in the whole process of mine-planning. Making software successfully is very important in the theory and practice. Through using the new software, the original database is established. Then 4827 samples are collected carefully and restructured into 4853 composed samples from 5000 testing data of gold grade in the mineral area. Statistical analyzing on the composed samples shows the gold grade is lognormal distributed, which estimates the grade with log-kriging, the variant coefficient is 246.8% and the grade distribution is nQt very even. From the structure of Yuanjiang gold deposit, it is proved that distribution of gold grade is anisotropic, the ratio of strike to dip to thickness of the deposit is 4 to 2.3 to 1.The mathematical model of Yuanjiang gold deposit is composed of surface model, rock model and grade model. It is established by taking gold grade as regionalized variables. Using the model, gold reserves and mean grades are estimated by many boundary grade. Gold reserves are 12.508 tons by the boundary grade of 0.Sglt, 10.26 1 tons by the boundary grade of 1 .OgIt. In addition, through economical evaluation of the deposit by means bf price-method, it is concluded that on the condition of economy and technology nowadays, the lowest industry grades of primary ore are 5.2g/t and that of oxidized ore is 0.65g1t.lt ls the thct that in Yuanjlang gold mine, primaly orebody occurs ln thlnl1er veln,nllnll1g has a hlgh povertillzed rate, a low llx1vlatlng rate and cost a lot, wl1lle oxldlzed ore Iseaslly exl3lolted and l1xivlated, low cost and good benefit on a large scale So exploit1ng tl1coxldlzed ore should be ln the 1irst place And wlth the lmprovement o1 t11e technology ln oredress1ng and smeltlng and the reductlon of cost, the boundary grade can be depressedThrough establis11lng depos1t modeI to optilnize industrial targets and recaIcLIlate reserves,the gold reserve' has been increased about l0 tons...