a. In placer mining, an automatic gate in a dam that holds the water until the reservoir is filled, then opens automatically and allows the escape of such a volume of water that the soil and upper gravel of the placer are washed away. When the reservoir is emptied the gate closes and the operation is repeated. On a smaller scale it may be used to furnish water periodically for sluicing. Syn: automatic dam; flop gate. Hess
b. A sonar transducer, used in the exploration of bottom substrata. Hy
c. Originally, an oilfield worker who migrated from one boom field to another; now, commonly, a member of a drill crew who works one job a short time, quits, and moves on to another locality to seek employment. Also called drifter. Long
d. A combination ratchet and lever device used to tighten a chain or line about a loaded truck or wagon to hold the load in place. Long
Source:
Dictionary of Mining, Mineral, and Related Terms












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