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Acid mine drainage

Acidic water run-off from mine waste dumps and mill tailings ponds containing sulphide minerals

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Acidic precipitation

Having a low pH caused by sulphur dioxide and nitric oxide gases, usually introduced by human industrial activity

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Abandoned workings

Areas of past geological or development work no longer maintained or not under current exploration

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Accelerator

A machine that uses velocity to electrically charge atomic particles such as electrons, protons, deuterons, and alpha particles, or a substance added to increase chemical reaction

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Adit

A horizontal opening driven into a hill or mountain for providing access to minerals