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1991年对加拿大和美国选煤厂情况进行普查的结果表明,加拿大选煤厂的数量仍为14处,没有增减。美国选煤厂却已较1989年普查的厂数减少25%(这主要由于近年来在煤矿中积极推行集中生产,扩大矿井生产能力,精简生产人员,促使美国生产矿井总数已从原有的4025处减少到2915处,减少27.6%。——译者注)。统计数字中不包括只有破碎和筛分设施的筛选厂和已经停产并且在近期内不会恢复生产的选煤厂。美国现有310处生产选煤厂,分布在
The 1991 census of the coal preparation plant in Canada and the United States showed that the number of coal preparation plants in Canada remained at 14, with no increase or decrease. The United States coal preparation plant has reduced by 25% from the 1989 census (this is mainly due to the active promotion of centralized production in coal mines in recent years, the expansion of mine production capacity, the streamlining of production personnel, and the total number of mines in the United States from the original 4025 Department reduced to 2915, a decrease of 27.6% .-- Translator’s Note). The statistics exclude screening plants with crushing and screening facilities and coal preparation plants that have been discontinued and will not resume production in the near future. The United States currently has 310 production coal preparation plant, located in