When Has a Mineral Resource Been Economically Depleted

question 5

Multiple Choice

When has a mineral resource been economically depleted? 

• A) When it costs more to mine the mineral than it is worth. 
• B) When 50% of the minerals have been mined. 
• C) When 80% of the minerals have been mined. 
• D) When there is no mineral left to mine.

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