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某市莹石矿属乡镇企业，1975年建矿，矿石主要成分为莹石（CaF2），年产量3万吨。1990年～1996年间，对该矿的作业环境和矽肺患病情况进行了动态观察。该矿为井下作业，1986年前为湿式开采，1986年后为干式开采。凿岩作业点空气中粉尘浓度平均为349．2mng／m3，粉尘中游离二氧
Yingshi City, a mining town of township enterprises, built in 1975, the main component of ore ore fluoride stone (CaF2), the annual output of 30,000 tons. Between 1990 and 1996, the operating environment of the mine and the prevalence of silicosis were dynamically observed. The mine is downhole operation, wet mining before 1986 and dry mining after 1986. Drilling operations in the air dust concentration average of 349.2mng / m3, dust free dioxygen