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衡量矿井生产集中化程度,一般采用三个指标:回采工作面平均月产量、采准巷道掘进率和井下辅助工人使用率。前一个是正指标,其值大,生产集中化程度相对较高;后两个是负指标,其值大,生产集中化程度相对较低。一、“广种薄收”是地方小煤矿效益低下的重要原因长期以来,地方小煤矿的经济效益较低,多数处于亏损状态。以宜宾9个地县煤矿为例,1989～1991年三年亏损278.3万元之多,吨煤亏损2.60元。原煤单位成本三年平
To measure the degree of concentration of mine production, three indicators are generally adopted: the average monthly production of mining face, the roadway heading rate and the utilization rate of auxiliary workers in the underground. The former is a positive indicator, with a large value and a relatively high degree of concentration in production. The latter two are negative indicators with large values and a relatively low degree of concentration in production. First, “a wide variety of thin income” is an important reason for the low efficiency of local small coal mines For a long time, the economic benefits of small local mines are low, most of them at a loss. Taking the coal mines in nine counties of Yibin as an example, the losses in the three years from 1989 to 1991 amounted to 2.783 million yuan, with a loss of 2.60 yuan per ton of coal. Unit cost of raw coal three years