The Bureau of Mines measured methane emission rates from an advancing salt face ranging from 15 to 56 ft3/ton (0.5 to 1.8 M3/t). Small room size, use of a continuous miner, and a well-defined ventilation system made possible air velocity and methane concentration measurements. These measurements, representing data from 18 production days, were conducted in an area of abnormally low- grade salt. Methane emissions occurred primarily during the advance of the salt face by continuous miner.
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