History of Colorado volume 1
History of Colorado volume 1
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In our eReader you can find the full English version of the book. Read History of Colorado volume 1 Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book History of Colorado volume 1
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N. Rogers on gold milling in Gilpin County the methods in vogue then betray the fact that there had been little, if any, ad- HISTORY OF COLORADO 251 vance in California methods and that the great progress in treatment is in the history of later years. Mr. Rogers says in this report of 1882 : "Most of the gold ores are reduced by stamping, and amalgamated, both inside and outside of the batteries, after which blanketings are- caught, to be panned or returned to the batteries and put through a se...cond time with the coarse rock. Below the blankets, suitable sluices and buddies are used to collect and concen- trate the outflowing tailings, which, being reduced to a 10 per cent gangue limit, become marketable product for smelters, because of their fluxing qualities more than their value. The richer sulphurets are hand-picked and cobbed for the smelters and some grades of ore which are not free milling are concentrated and likewise sold. " In 1867, or perhaps a year or two earlier, stamp milling in Gilpin County barely escaped disastrous failure because of the refractoriness of the very heavy sulphide ores.
What to read after History of Colorado volume 1?
You can find similar books in the "Read Also" column, or choose other free books by Wilbur Fiske Stone to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
N. Rogers on gold milling in Gilpin County the methods in vogue then betray the fact that there had been little, if any, ad- HISTORY OF COLORADO 251 vance in California methods and that the great progress in treatment is in the history of later years. Mr. Rogers says in this report of 1882 : "Most of the gold ores are reduced by stamping, and amalgamated, both inside and outside of the batteries, after which blanketings are- caught, to be panned or returned to the batteries and put through a se...cond time with the coarse rock. Below the blankets, suitable sluices and buddies are used to collect and concen- trate the outflowing tailings, which, being reduced to a 10 per cent gangue limit, become marketable product for smelters, because of their fluxing qualities more than their value. The richer sulphurets are hand-picked and cobbed for the smelters and some grades of ore which are not free milling are concentrated and likewise sold. " In 1867, or perhaps a year or two earlier, stamp milling in Gilpin County barely escaped disastrous failure because of the refractoriness of the very heavy sulphide ores.
What to read after History of Colorado volume 1?
You can find similar books in the "Read Also" column, or choose other free books by Wilbur Fiske Stone to read onlineMoreLess
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