basalt mill washing equipment mining,
High Production Sluice Box - Mineral Processing / Metallurgy
Oct 27, 2016 . The sluice boxes used in hydraulic mining, though, as usual, only 12 feet . or, with less advantage, allowed to fill up with gravel when washing begins. . Basalt is generally used, oval stones of 15 or 18 inches long and from 9 to 12 .. from the sluices is finer than that from quartz mills, and is sometimes 990.