Mineral | Threshold amount | |
Bauxite | 500,000t | |
Clays | 50,000t | |
Copper | 1,000t | |
Diatomite | 10,000t | |
Dimension stone | 50,000t | |
Gold | 100kg | |
Gypsum | 50,000t | |
Lead | 5,000t | |
Limestone | 100,000t | |
Magnesium rich materials | 250,000t | |
Phosphate rock | 10,000t | |
Silica | 100,000t | |
Silver | 5,000kg | |
Tin | 100t | |
Titanium minerals | 50,000t | |
Zinc | 5,000t | |
Zircon | 1,000t |