Cage — In a mine shaft, the device, similar to an elevator car, that is used for hoisting personnel and materials. Calorific value — The quantity of heat that can ...
Port Manteaux churns out silly new words when you feed it an idea or two. Enter a word (or two) above and you''ll get back a bunch of portmanteaux created by jamming ...
A. Abutment In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch ...
Chapter 74 Mining and Quarrying MINING: AN OVERVIEW. Norman S. Jennings. Minerals and mineral products are the backbone of most industries. Some form of mining .