RBC Capital Markets, a global investment bank, National Bank of Canada, a commercial bank, and Scotiabank, a banking and financial services company, agreed to acquire a 8.5% stake in Capstone Copper, a portfolio of long-life copper operations in the Americas, from Orion Mine Finance, an alternative investment management firm, for $320m. The company has granted the underwriters an option, exercisable in whole or in part at any time up to 30 days after the closing of the offering, to purchase up to an additional 8.9m common shares from the company at the offering price which, if exercised in full, would increase the aggregate gross proceeds of the offering to $321m.