March 11, 2014, 03:38:21 PM by Geezir
| Views: 51 | Comments: 1
I have had Will's Mineral Processing Technology from the First Edition and was reading the Seventh Edition when this caught my eye.
"For instance, it is common practice to remove material less than 10um in size from tin concentrator feeds and direct this material to the tailings. In the early 1970s, 50% of the tin mined in Bolivia, 30% of the phosphate mined in Florida, and 20% of the world's...