Ch. 1: Gold and Silver in 1913

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	872 MINERAL RESOURCES, 1913—PART 1.

	the gradual increase iirplacer production from 23.76 per cent in 1910, to 24.17 per cent in 1911, to 24.94 per cent in 1912, and to 24.96 per cent in 1913; also corresponding decreases in output from dry or siliceous ores from 68.91 per cent in 1910 to 68.52 per cent in 1911, to 67.29 per cent in 1912 and to 66.45 per cent in 1913. The changes are mainly due to increased dredging output on the one hand and to decrease in tenor of the great gold-quartz ore bodies worked on the other. The following table shows the sources by classes of ore, by States, of the gold production of 1913, and for comparison of totals by sources the corresponding figures for 1912 are given: Source of gold in 1913 in States and Territories, as reported from the mines to the *United* States Geological Survey, by kinds of ore and by States, in fine ounces."



	PLACERS. The total value of the gold placer production was $22,238,424 in 1913, against $23,019,633 in 1912. These figures represent 24.96 per cent of the total domestic gold output for 1913 and 24.94 per cent of that for 1912. The placer production of Alaska was $10,680,000 in 1913, against $11,990,000 in 1912 and $12,540,000 in 1911, and that of California was $8,836,177 in 1913, against $8,645,663 in 1912 and $8,986,527 in 1911. Dredging supplied $12,226,976 in 1913 against $11,218,804 in 1912 and $10,311,589 in 1911. Of this California produced $8,090,294 in 1913, against $7,429,955 in 1912, and Alaska $2,200,000 in 1913 and

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