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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.