, A History of the Western Phosphate Industry, Proceedings of the 1966 Industrial ...

Three periods of activity make up the mining History of the Silver City region. As the graph in Figure 7 shows, two of these episodes were ... If the placer deposits had been the sole attraction in the Silver City region, its History would have been short-lived. By the end of the 1864 season the placers were ... -12- (Wells, 1963, p. 34). This episode in the History of the district involved the dis- covery of the rich Poorman vein. Hays and Ray owned ...

History and production ... taken up in detail below. PLACER DEPOSITS History AND PRODUCTION Gold was discovered along the Salmon River at a point where ... work done on them. COPPER DEPOSITS History AND PRODUCTION The copper deposits were discovered in the late eighties, but ...

Early exploration and Indian History 22 Future volcanic activity ... as they appear today; let us Monument. turn back the pages of stone in the geologic History of this region s a double line to the time before any lava had appeared in ... IDAHO BUREAU OF MINES'AND GEOLOGY EARLY EXPLORATION AND INDIAN History In 1879 Mr. J. W. Powell, formerly of Arco, Idaho, but ...

92 History ........................ ........... [ ~ i t~ n a, r the mine antiI ... Production. ............................................... 1%V History .................................................... 121 phous quartz vein ... plan of the eighth level, De Lamar mine.. ............. .In pocket History and production. ..................................... 1:34 911. Geologic plans ...

Early History .................... ... ... Geologic History 29 ... History .... ...