Inside Dredge No. 4
Gold was recovered in a rotating 49.5-foot (15.1 m) long trommel screen with 9.75-foot (2.97 m) diameter and 12.5% grade.[14] A pipe was suspended within the trommel, carrying water upwards to spray the incoming material, cleaning it and breaking up larger lumps.[15] Finer material (gold, sand, and pebbles) was sieved through 0.75-inch (1.9 cm) holes in the screen, which rotated at 7.8 revolutions per minute, into a distributor box.
Inside Dredge No. 4
Gold was recovered in a rotating 49.5-foot (15.1 m) long trommel screen with 9.75-foot (2.97 m) diameter and 12.5% grade.[14] A pipe was suspended within the trommel, carrying water upwards to spray the incoming material, cleaning it and breaking up larger lumps.[15] Finer material (gold, sand, and pebbles) was sieved through 0.75-inch (1.9 cm) holes in the screen, which rotated at 7.8 revolutions per minute, into a distributor box.