acid-producing material

acid-producing material

[′as·əd prə¦düs·iŋ mə′tir·ē·əl]
(mining engineering)
In coal mining, rock strata containing sufficient amounts of pyrite to cause acid formation when the strata are weathered by air and water.
References in periodicals archive ?
MTM's answer is a encapsulation plan, which entails analyzing waste rock before mining begins, isolating the potentially acid-producing material in the core of a waste-rock dump, then surrounding it with non-acid-producing waste.