Produksi
Cadangan
Australia
75,000
6,000,000
China
70,000
1,000,000
Guyana
50,000
7,400,000
Brasil
27,000
2,600,000
India
24,000
660,000
Indonesia
7,100
1,200,000
Berdasarkan Riset Badan Geologi Amerika Serikat (USGS)