Studies of magnetic properties of several samples of Singhbhum dolerites from Bihar, India, showed some interesting features. The saturation intensity versus temperature curves indicated a considerable leftover intensity (about 30--60%) beyond a temperature of 675¿C. Values of saturation intensity were much higher than those of magnetite. These observations indicated the probable existence of a small fraction of iron in the samples. The iron could have been produced by alteration of titanomagnetite as a result of regional or contact metamorphism of the newer dolerites.