Ageologist has identified two iron deposits. one of th contains 100 million tons of magnetite (fe, o4), and the other contains 20 million tons of magnetite (fe, o4), and 80 million tons of hematite (fe, o3). based on the iron content alone, which of the two deposits should be rec- ommended for mining? gram atomic weights of the ele- ments: fe 55.85; o 16.00. em