Ch. 1: Gold and Silver in 1916

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	GOLD AND SILVER.	707

	88 per cent of the total production of gold coming from these sources alone. The total contribution of gold derived from the great copper, lead, and zinc mines of the country is therefore relatively small, notwithstanding their recent enormous development and production of ore. It is interesting to note, however, that the placer mines and dry or siliceous ores yielded 2 per cent less of the total gold than they did in 1915 and 4 per cent less than in 1914 and that the output of gold from placer mines, which had advanced from nearly 24 per cent of the total gold in 1910 to more than 25 per cent in 1914 and had declined to less than 23 per cent in 1915, increased to 25 per cent in 1916. This increase in percentage was due, however, not so much to increased output from placers as to smaller production from deep mines. The contribution of gold from dry or siliceous ores, which had gradually declined from about 69 per cent in 1910 to about 66 per cent in 1914 and had increased to nearly 68 per cent in 1915, decreased more than 4 per cent in 1916. The yield of gold from copper ores increased from 6 per cent in 1914 to 7 per cent in 1915 and to 9 per cent in 1916. Mine, production of gold in 1916, in fine ounces."



	The total value of the production of gold from placers was 122,881,663 in 1916, against $22,272,501 in 1915. The placer production increased in Alaska, Oregon, and Colorado in 1916, but decreased in Nevada, California, Idaho, and Montana.

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