Many operating mines are money losers but it is cheaper to keep running than to properly close them.
Sometimes you will hear of a mine shifting to, "care and maintenance," where operations stop but a skeleton crew continues security, maintenance, and activity to mitigate environmental hazards.
With coal up to $300 a ton, marginal mines can make a profit.
Historically speaking. Of course when commodities are high mining inputs are also high (diesel...), so they frequently don't make a killing when you think they would. Good sales prices definitely help keep the lights on, though.
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