Limestone
from the EPA's Mid-Atlantic Integrated Assessment:
Limestone "is the least expensive [active treatment method] and safest to use for AMD treatment. Essentially, either chunks or ground limestone are added directly to AMD water."
Abandoned Mine Reclamation Clearinghouse … serving Pennsylvania watershed associations
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a service of
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from the EPA's Mid-Atlantic Integrated Assessment:
Limestone "is the least expensive [active treatment method] and safest to use for AMD treatment. Essentially, either chunks or ground limestone are added directly to AMD water."