alvarezesm
alvarezesm alvarezesm
  • 18-05-2017
  • Chemistry
contestada

how are coals and ores mined

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Ranchbroncs801 Ranchbroncs801
  • 18-05-2017
depends on what kind of mining. if its surface and underground its about the same. But what kind of mining are you looking for? underground depends on depth, overburden, and density
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