Silver and Gold: an Account of the Mining and Metallurgical Industry of the United States: With Reference Chiefly to the Precious MetalsJ.B. Ford, 1873 - 566 من الصفحات |
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الصفحة 18
... present mode of working . An investigation will disclose the fact that nearly all the gold ores of California contain no meager per- centage of silver . The same may be said of the " gold ores " of other States and Territories . By way ...
... present mode of working . An investigation will disclose the fact that nearly all the gold ores of California contain no meager per- centage of silver . The same may be said of the " gold ores " of other States and Territories . By way ...
الصفحة 19
... present general system of gold mining is based upon the idea that gold is mainly coarse , while examination will show that the high percentage is in atoms finer than flour itself . In my experiments gold has been taken up so fine that ...
... present general system of gold mining is based upon the idea that gold is mainly coarse , while examination will show that the high percentage is in atoms finer than flour itself . In my experiments gold has been taken up so fine that ...
الصفحة 23
... present year it has been found necessary to increase the number and enlarge the capacity by making costly additions to the establishment . There are four fifty - vara lots to be filled in up to deep water , and these will be covered ...
... present year it has been found necessary to increase the number and enlarge the capacity by making costly additions to the establishment . There are four fifty - vara lots to be filled in up to deep water , and these will be covered ...
الصفحة 28
... present , as if the best divis- ion of the two volumes would be to allot the general geology to one and the economi- cal geology to the other . In that case the first one would contain a systematic descrip- tion of the geology of ...
... present , as if the best divis- ion of the two volumes would be to allot the general geology to one and the economi- cal geology to the other . In that case the first one would contain a systematic descrip- tion of the geology of ...
الصفحة 50
... present means of crushing . In addition to this a " strike " took place during the month of April , in Amador County , and the Oneida , Keystone , Amador , and other leading mines were closed for a period of nearly three months ...
... present means of crushing . In addition to this a " strike " took place during the month of April , in Amador County , and the Oneida , Keystone , Amador , and other leading mines were closed for a period of nearly three months ...
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