Mining terminology

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Across
  1. 2. A sheet of ore found inside rocks
  2. 4. A type of mine that is exposed to the open air
  3. 5. A material that we attribute value to for it's beauty and rarity
  4. 8. An area in Alberta rich in crude oil and bitumen
  5. 9. The act of mining an ore and leaving behind an open space.
  6. 10. A material found naturally in the ground with a well defined chemical structure
  7. 11. A type of rock that is common on the surface and comparatively weak
  8. 12. Rock and stone, brother!
Down
  1. 1. 3 iron, 2 sticks
  2. 3. Reinforcements for tunnels
  3. 6. The act of extracting ore from the Earth
  4. 7. A stereotypical gold miner