| Ore deposit economic evaluation is on the basis of ore deposit geology evaluation, according to the conditions of the mineral deposit technology and economic conditions,a certain period of time in the future to the proven mineral reserves evaluation of the economic benefits of industrial development. In the enterprise for ore deposit geology and prospecting, mining design construction and development, has very important guiding significance to the economic evaluation of ore deposits.This thesis from geological, technical, economic and resource potential in four aspects of Bainiuchang Ag polymetallic ore in technical and economic evaluation, results and understanding are as follows:1.Bainiuchang Ag polymetallic ore deposit-transform-magmatic hydrothermal deposit, ore body occurs in the lower Cambrian Tian Peng group upper sand shale and carbonate rocks, ore rock as siliceous rocks. According to the spatial distribution law of ore bodies could be divided into as bedded ore body-the lenticular, vein orebody and ore bodies dipping vein-fine vein-net vein orebody.Mineral composition is more complicated, the main metallic mineral are pyrite, pyrrhotine, marmatite, sphalerite and galena.The structure of the ore are mainly formed colloidal structure, strawberry structure, granular structure and strip structure by deposition mineralization; formed the package insert structure, solid solution structure and metasomatic structure by hydrothermal mineralization; formed the porphyroblastic structure, soft wrinkles structure and mylonite structure by stress. According to genetic the ore structure can be divided into the contemporaneous sedimentary structure, slide deformation structure and epigenetic structure,which of them the massive structure, disseminated structure, veinlets-stockwork structure and brecciated structure are more typical.2. According to the reserves estimates, the Bainiuchang mine area accumulates the region accumulated2933.6879ten thousand tons,which are in the metal content are2825.527tons of of silver,500474tons of Pb and890684tons of Zn,1803.965million tons of tin ore paragenesis and62366tones of the amount of metal,588.9524million tons of tin associated ore and6964tones of the amount of metal. As of September9,2013within the Bainiuchang mine area the keep resource reserves ore quantity are2161.2226ten thousand tons, which are in the metal content are1653.907tons of of silver,284767tons of Pb and586440tons of Zn,1354.4787million tons of tin ore paragenesis and43586tones of the amount of metal,460.3449million tons of tin associated ore and5055tones of the amount of metal.The consume resources reserves are772.4653ten thousand tons, which are in the metal content are1171.62tons of of silver,215707tons of Pb and304244tons of Zn,449.4863million tons of tin ore paragenesis and18780tones of the amount of metal,128.6075million tons of tin associated ore and1909tones of the amount of metal.3.The industry development of Ag-Sb-Zn associated with steady GDP remained at0.98-1.1, from January to December of2012, Ag-Sb-Zn smelting industry total sales revenue reached260.0829billion yuan, increased of14.57%to a year earlier, higher than the industry average of11.04%. It is expected that in the future there will be a period of time, as China’s industrialization and urbanization in the energy, and non-ferrous metals, increasing demand, electricity, transport, construction, mechanical, aerospace and defense industries, such as rapid development, will inevitably result in silver, lead, zinc, and other non-ferrous metals demand has continued to increase. In this big advantageous background, the Bainiuchang silver polymetallic mine development will be able to create significant economic and social benefits.4. This paper applied net present value and internal rate of return and other dynamic indicators, which is very common in technical and economic evaluation of deposits. From various angles Bainiuchang silver polymetallic evaluation, after obtains tax the internal returns rate61.6%, the investment payback period3.5years, the profit total amount2183.4752million yuan, after the tax the profit1637.6063million yuan, the financial net present value is1033.7062million yuan, the latent economic value is huge, develops this mine enterprise to attain the economic efficiency to be extremely obvious.5. For Bainiuchang Ag polymetallic ore production ore amount is larger, the mine service life of looking for mineral resources is relatively short, to be continued, in this paper according to the distribution characteristics of the ore bodies and the change rule four prospecting target areas are put forward, the other334types of44.748347million tons of ore was not included in the scope of evaluation. Thus, the Bainiuchang Ag polymetallic ore resources potential is tremendous, development prospect is very optimistic. |
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