Essentially, to secure the maximum output of coal from the minimum length of face with due regard to safety and development. To measure the degree of concentration at a colliery the following data are collected: (1) the total length of coalface; (2) the total length of main haulage roads; and (3) the total output. In general, the greater the dispersion of the workings, the greater the manpower employed and the higher the costs of production. See also: face concentration; geographical concentration; overall concentration. Nelson
Source:
Dictionary of Mining, Mineral, and Related Terms












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