1. Bornite is also found as disseminations in mafic igneous rocks, in contact

2. Copper mineralization occurs mainly as disseminations around and in the altered stocks, and in the form of veins and stockworks and as impregnations in the surrounding lavas and pyroclastic rocks.

3. Chalcopyrite ore occurs in a variety of ore types, from huge masses as at Timmins, Ontario, to irregular veins and disseminations associated with granitic to dioritic intrusives as in the porphyry copper deposits of Broken Hill, the American cordillera and the Andes.