薄煤层开采新技术评价［美］Ｊ．Ｓ．Ｊｏｓｐａｌ等美国薄煤层的储量很丰富，且煤层倾角小、埋藏浅、不受断层影响。但由于技术和经济因素的限制，这些薄煤层大部分没有开采。１９８６年，薄煤层（１０６５ｍｍ以下）产量只占总产量的２１％，其中厚度为３５５～７１０ｍ... Thin coal seam mining new technology evaluation [America] J. S. Jospal and other thin coal deposits in the United States is very rich, and coal seam angle is small, buried shallow, unaffected by the fault. However, due to technical and economic constraints, most of these thin coal seams are not mined. In 1986, thin coal seams (below 1065mm) accounted for only 21% of the total output, with a thickness of 355 ~ 710m ...