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根据官方表报资料,四个进行试验的哈萨克斯坦铅锌矿山近六年来损失和贫化的情况列于表1(%)。由于某些矿块的开采一般历时2—3年之久,而在某种程度上正确的损失和贫化的计算仅能在矿块完全注销之后(特别是采用大量回采法时)进行,所以表1中所列各年数据不是十分正确的。此外,这些数据中不包括“结构”贫化。各企业在计算相对的损失率和贫化率时,对回采矿块储量的原始计算,不是始终以必要的客观态度进行的。表1所示,报表数据中的损失和贫化很大。有时贫化超过损失二倍以上,并有逐年增加的趋向。米尔加里姆赛矿的贫化率较低,但
According to official reports, losses and dilutions of the four piloted lead-zinc mines in the past six years are shown in Table 1 (%). Since the mining of some nuggets generally takes 2-3 years, and to some extent the correct calculation of losses and depletions can only be done after the nuggets have been completely written off, especially when using a large number of recovery methods The data for each year listed in Table 1 are not very correct. In addition, these data do not include “structure ” depletion. When calculating the relative loss rate and the depletion rate, the original calculation of the reserves of mining block is not always carried out with necessary objective attitude. As shown in Table 1, the loss and dilution in the report data is very large. Sometimes lean more than twice the loss, and there is a trend of increasing year by year. The Mill Galimu mine has a low rate of depletion, however