ABIDJAN, March 10 (Reuters) - Ivory Coast's Coffee and Cocoa Council has sold more than 400,000 metric tons of cocoa export contracts to local grinders in the 10 days since exporters resumed purchases for the mid-crop, sources at the regulator and exporters told Reuters on Tuesday. Exporters' association GEPEX, which includes Barry Callebaut BARN.S, Olam OLAG.SI and Cargill CARG.UL, agreed on a solution with the regulator in late February. Only 10,000 tons has been previously sold for the mid-crop due to a sharp drop in global prices, an official at the CCC said, highlighting \"a great performance\" after the resumption. Last week, the world's biggest cocoa producer cut the fixed farm-gate price paid to cocoa farmers to 1,200