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6. The more valuable the metal, the higher its cut-off grade is

  • False
  • True

7. The higher the demand for the metal, the more valuable and lower its cut-off grade will be

  • True
  • False

8. What is a natural resource?

  • An accumulation of metal that may be economic to mine
  • A useful and valuable natural material
  • A natural material found on the earths surface which is invaluable
  • A resource which is made by earth's components

9. What are reserves?

  • A rock containing valuable metals that is economic to mine
  • The amount of the resource that can be extracted at a profit using existing technology
  • An accumulation of metal that may be economic to mine
  • A resource that will last for an infinite amount of time

10. What is an Ore?

  • The rock containing valuable metals that is economic to mine
  • The predicted amount of metal minerals within a rock
  • An accumulation of metal that may be economic to mine

11. If they are useful, scarce metal will have a lower cut-off grade

  • True
  • False

12. The Grade is the amount of metal in the ore

  • True
  • False

13. What is the Cut-off grade?

  • The percentage of an ore that is economic
  • The minimum grade that is economic to mine
  • The maximum grade that is economic to mine

14. What is a gangue mineral?

  • A useful and valuable natural material
  • A low value waste mineral
  • A mineral of the highest value

15. What does average crustal abundance describe?

  • The amount of metal in average continental crust
  • The amount of metal in average oceanic crust
  • The amount of metal found on the earth's surface

16. What is an ore mineral?

  • A mineral containing valuable metal
  • The rock containing valuable metal that is economic to mine
  • A low value waste mineral

17. Large deposits will be economic to mine at lower cut-off grades than small deposits

  • True
  • False