TORONTO -The board of Canada's Barrick Mining has raised the possibility of splitting the company into two separate entities, one focused on North America and the other on Africa and Asia, four sources familiar with the company's thinking told Reuters. A split could also include the outright sale of Barrick's African assets as well as of the Reko Diq mine in Pakistan, once it has secured financing, according to the sources. In Mali, Barrick is looking to resolve a dispute with the African