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6. The more valuable the metal, the higher its cut-off grade is
7. The higher the demand for the metal, the more valuable and lower its cut-off grade will be
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
12. The Grade is the amount of metal in the ore
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