Depletion time describes the length of time it takes to use up
50% of a mineral reserve.
60% of a mineral reserve.
75% of a mineral reserve.
80% of a mineral reserve.

Depletion time describes the length of time it takes to use up
50% of a mineral reserve.
60% of a mineral reserve.
75% of a mineral reserve.
80% of a mineral reserve.

Depletion time describes the length of time it takes to use up 80% of a mineral reserve.

Depletion time describes the length of time it takes to use up 50% of a mineral reserve. 60% of a mineral reserve. 75% of a mineral reserve. 80% of a mineral reserve.

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