Show REDUCTION MILLS IN WESTERN WESTER 14 STATES in 1912 an investigation was made by the united states geological survey as to the number of reduction mills in the various western states with details of their equipment and the results were published inthe in the mineral resources report of that year the present list was compiled by charles G yale V C heikes and chas W henderson of the U S geological su survey arvey an and d is being published by the U S bureau of mines for the bene benefit fit of the industry strict accuracy in details is n not ot claimed for the preset present list of reduction mills as in the limited time a at t disposal it was not always possible to send for corrections or additional information the list however may be considered a revision of that of 1912 the figures of daily capacity include those of the direct milling tailings cyanide flotation and smelting smelling sm elting plants while gold dredges are not considered as reduction plants in the lists given given yet they really perform that function not only of digging the gravels but of concentrating and separating the gold and may be considered the most important of the mechanical appliances of placer gold mining there were 40 of these dredges operating in california in 1920 and 4 in oregon 3 in idaho 3 in montana and 1 in nevada for purposes of economy the list for each state has been bound separately and given a subtitle and the following are available serial 2287 A california 2287 B oregon 2287 C washington 2287 D idaho 2287 E utah 2287 F montana 2287 G nevada 2287 H arizona copies of these may be obtained by writing to the director bureau of mines washington D C lists for other western states will also be published by the bureau of mines as soon as these are available |