Mining Districts And Their Relation To Structural Geology

Fox the past fifty years or more, the structural features of the Cordilleran mountain system of western United States have presented some most interesting problems. Any geologist or engineer living in this region, or even making occasional examinations. of the mines, will lose much of interest and importance if he is not familiar with the literature. Some of the greatest works on geology have been the, result of studies carried on in sections of this region. Among the more important of the earlier works are those of Dutton,1. King,2 Gilbert,3 and Powell;4 of the more recent Lindgren,5 Ransome,6 Spurr,7 Butler,8 and others have contributed much. Many of the papers are largely of scientific interest but even these lay the foundation for the commercial application of the broader features of the geology. I have read many of these works with the keenest interest and pleasure; in fact, some have been read until some of the more important findings seem to be my own. In this paper, however, it is my aim to accept credit for little more than the labor of assembling some of the ideas of others. This is done with the hope that an interesting and valuable discussion will be the result. If some of the ideas presented should