Except that mining became largely mechanized, especially in the first world, reducing the labor intensity required to mine it: https://wvpolicy.org/blog-series-

Except that mining became largely mechanized, especially in the first world, reducing the labor intensity required to mine it: https://wvpolicy.org/blog-series-the-impact-and-future-of-the-w-va-coal-economy/ https://wvpolicy.org/blog-series-the-impact-and-future-of-th...