GOLD AND SILVER.	247
	Source of silver in 1911 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—Continued.
	Placers yielded 0.3 per cent of the total silver output in 1911. In gold and silver mills 15.67 per cent was recovered—1.54 per cent by amalgamation and 14.13 per cent by cyanidation. The remainder of the silver production, 84.03 per cent of the total, was recovered by smelting—25.31 per cent coming from dry or siliceous ores, 27.43 per cent from copper ores, 25.53 per cent from lead ores, 1.03 per cent from zinc ores, 0.47 per cent from mixed ores, and 4.01 per cent from lead-zinc ores. The smelting of the three great classes of ores therefore produced, in nearly equal quantities from each, 78.27 per cent of the total silver output; milling yielded 15.94 per cent, and the placers and smelting of the other ores the small remainder. PLACERS.
	The output of silver from placers, mainly in Alaska and California, was 170,084 fine ounces in 1911, against 159,381 fine ounces in 1910. The recovery is by refining the placer gold.