The total number of operating coal mines in the U.S. has hit its lowest point since at least 1923, one of the earliest year on record, according to the Energy Information Administration.
The contract will give the company, which wants to become a one-stop shop African fertilizer business, a platform to distribute the product across eastern and southern Africa.
He said the over 1,000 cubic metres of liquid cyanide spilled into a local river did not cause any environmental damage to justify keeping operations suspended.