An acid-mine sludge pond (IMAGE)

Penn State

An acid-mine sludge pond

Caption

An acid-mine sludge pond in central Pennsylvania. A byproduct of coal mining, such sites may be rich with critical minerals.

Credit

Provided by Sarma Pisupati

Usage Restrictions

Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted.

License

CC BY-NC-ND

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