Beaver, Iron, and Pitite................ 183,548
Juab and Utah......................... 3,622,596
Salt Lake............................... 969,849
Summit and Wasatch.................. 7,109, 209
Tooele.................................. 263, 682
Washington, Millard, Sevier, Grand, and Boxelder........................ 55,127
The commercial value of silver per ounce in 1903 was 53.41 cents; in 1904 it was 57.25 cents.
The greatest increase in silver was made in Salt Lake County, Juab and Tooele counties following.
The reports returned from mining operations in Utah in 1904 numbered 716. Of this number, 594 lode mines and 10 placers reported development and assessment work; the remainder, 112 in number, were producing properties. Of these 110 were quartz or lode mines and 2 placer mines. In addition, 45 milling and 7 smelting plants were reported. Of the milling plants connected with mines, 26 were operating, 17 were idle, and 2 had been dismantled. Of the 7 smelters, 3 were connected with mines; the other 4, each treating ores from properties connected with the same organization, are located near Salt Lake City. Custom ores were purchased by 2 of the smelting companies.
Of the 26 milling plants, 4 were stamp mills in which the ore was concentrated, which was followed by amalgamation. One mill was equipped with direct amalgamation over copper plates. Fourteen mills were equipped with different kinds of crushers, rolls, and concentrators. Seven were plants using the cyanide process, of which plants 5 cyanided the ore without other treatment; 1 combined amalgamation for coarse gold with crushing in cyanide solution and passing the pulp over silver-coated copper plates to concentrators, and with final treatment of tailings in cyanide solution, and one dry crushed, cyanided, and amalgamated.
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