Abstract
Although crushed stone is indispensable to building and maintenance of social infrastructure and a large amount of it (about 9.5×108t, in Japan 1990) has been used, few papers have studied crushed stone resources because of their abundance. In Japan, nevertheless, maintaining a stable supply against the increasing demand will become a serious problem. There are many problems in mining crushed stone and these can be classified as economic and social restrictions. Economic restrictions arise mainly from increases in both labor and transportation costs. Social restrictions include many environmental protection regulations by national and local authorities.In this paper, problems concerning crushed stone resources are classified as a part of geoscience and their deposits, demand and supply are considered. Efforts that should be made in the future to increase the potential of the quarrying business can be arranged into three categories, that is, automated methods of planning the mine site, efficient systems of transportation from factory to consumer, effective measures to deal with spoiled sight.
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