a. In bituminous coal mining, one who sets short wooden props in a slanting position (sprags) under the upper or overhead section of a bed of coal to hold that section up while the lower section is being mined, or wedges heavy slanting props (sprags) against the coal to prevent it from flying when broken down by blasting. DOT
b. One who places short pointed wooden sprags between the spokes of a mine car wheel to stop the car.
Source:
Dictionary of Mining, Mineral, and Related Terms












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