a. Mine water that contains free sulfuric acid, mainly due to the
weathering of iron pyrites. A pit water, which corrodes iron pipes and
pumps, usually contains a high proportion of solids per gallon,
principally the sulfates of iron, chiefly ferrous and alumina.
See also: acid water
b. Where sulfide minerals break down under chemical influence of oxygen
and water, the mine drainage becomes acidic and can corrode ironwork. If
it reaches a river system, biological damage may also result.
Dictionary of Mining, Mineral, and Related Terms