GHM estimates the project will employ about 500 people and contribute up to $550 million dollars in federal and provincial taxes, $210 million in British Columbia Mining Act tax, and $110 million in municipal taxes.
Shares in the Africa-focused diamond miner climbed almost 6% after it revealed the Mothae kimberlite project in Lesotho may be more profitable than previously assumed.
Average sales margins for coal miners have fallen by about half since 2011, forcing three of the U.S.'s largest publicly traded producers to file for bankruptcy protection this year.