As part of the deal, the Lundin Family Trust also agreed increase its stake in the company from 17.7% to 19.9%.
Environmental campaigners are challenging the approval of a coking coal mine in northwest England.
Barrick Gold's second-quarter gold output edged up by almost 0.9% from the previous three months.
Investment gives Assore International a 14.99% non-diluted stake in the Canadian copper company, which owns the namesake project in Chile.
