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Illinois

机译：伊利诺伊州

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Mineral exploration in Illinois during 1994 was low in general and, in some cases, nonexistent. Construction aggregates production increased significantly, whereas production of most other industrial minerals remained relatively steady. Coal production posted a strong recovery compared with 1993. In recent years, Illinois coal production averaged about 54 Mt/a (60 million stpy). However, in 1993 it dropped to 38 Mt (42 million st) due to a coal-miners' strike. The strike and the uncertainty faced by Illinois Basin coal miners due to the Clean Air Act Amendments of 1990 put a damper on coal exploration. Despite that, 1994 production recovered to 46 Mt (51 million st). Drilling in 1994 was confined to mine development needs. Plugging affidavits filed with the Illinois Department of Mines and Minerals in 1992, 1993 and 1994 numbered 537, 530 and 349, respectively, for development drilling and 81, 13 and zero for exploration drilling. Planning and development at one mine accounted for nearly two-thirds of the 1994 drilling activity. Closely spaced testing was conducted to delineate lenses of unstable roof shale at that mine. One-fifth of the drilling was performed for development purposes at a small strip mine in southern Illinois. The rest of the development holes drilled during 1994 were linked to the planning needs of several large underground mines. Industrial-mineral production increased significantly during 1994. Total production value increased nearly 5 percent from 1993. Crushed stone, construction sand and gravel, cement, industrial sand and lime were the state's five leading mineral commodities. In 1994,92 Mt (101.5 million st) of crashed stone and construction sand and gravel were produced. Due to the downward revisions of 1992 and 1993 aggregate production figures, 1994 may be the first year since 1979 that production exceeded 91 Mt (100 million st).
机译：1994年期间，伊利诺伊州的矿物勘探总体上较低，在某些情况下甚至不存在。建筑骨料的产量大幅增加，而其他大多数工业矿物的产量保持相对稳定。与1993年相比，煤炭生产恢复强劲。近年来，伊利诺伊州的煤炭生产平均约为54 Mt / a（6000万stpy）。但是，由于煤矿工人的罢工，在1993年降至38 Mt（4,200万吨）。由于1990年的《清洁空气法》修正案，伊利诺伊州盆地煤矿工人的罢工和不确定性给煤炭勘探带来了障碍。尽管如此，1994年的产量恢复到46 Mt（5,100万st）。 1994年的钻探仅限于矿山开发需求。 1992年，1993年和1994年分别向伊利诺伊州矿业和矿产部提交的封存誓章分别为537、530和349，分别用于开发钻探，分别为81、13和零。一个矿山的规划和开发占1994年钻探活动的近三分之二。进行了近距离测试，以描绘该矿山不稳定屋顶页岩的透镜。五分之一的钻探是在伊利诺伊州南部的一个小型露天矿上进行的，用于开发目的。 1994年期间钻出的其余开发孔与几个大型地下矿山的规划需求有关。 1994年工业矿物产量显着增长。总产值比1993年增长了近5％。碎石，建筑沙子和碎石，水泥，工业沙子和石灰是该州的五个主要矿产商品。 1994年，生产了92吨（1.015亿公吨）的碎石，建筑细砂和砾石。由于对1992年和1993年的总产量数字进行了下调，1994年可能是自1979年以来第一年产量超过91吨（亿吨）的年份。

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