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Loss of Quicksilver.—There is an unavoidable loss of quicksilver, the amount of which depends on the char­acter of the gravel washed, the quantity of water used, the grade, length, and condition of -the sluices, and the number of days run. The use of a long line of sluices, kept in good order, and the employment of undercur­rents, tend to diminish it.
La Grange.—The aggregate amount of quicksilver lost at the La Grange Hydraulic Company's mine in run­ning six claims, during a period of two and a half years, aggregating 1,520* days (24 hours each), washing and moving 2,275,967 cubic yards of gravel, and using 1,533,728 miner's inches of water (2,159 cubic feet each), was 553.75 pounds.
The exact loss of quicksilver during four years' work on the various claims of this company amounted to 1,200 pounds.
North Bloomfield.—For the year ending Novem ber 3, 1875, the North Bloomfield claims used 464,600 miner's inches of water (2,230 cubic feet each), and 9,649 pounds of quicksilver were employed in the sluices.
The loss of quicksilver at the respective claims was as follows: