History of Colorado volume 1

Cover History of Colorado volume 1
History of Colorado volume 1
Wilbur Fiske Stone
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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.

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