Magnum Mining and Exploration (ASX:MGU) has had the entire bulk sample from its Buena Vista Iron Project in Nevada put to the metallurgical test – and the results haven’t disappointed. That 432kg sample produced magnetite concentrate of 69% Fe with a 45% recovery – grades that exceed the benchmark 62% Fe fines price. “While ultimately the prices received will depend on offtake agreements, the contemporary spot market, and future economic conditions, this differential has been relatively consistent over a long time,” MGU announced to the market. Grade attracts price premiumBut the price differe…