Situated in the San Gabriel Mountains of Southern California is a large body of anorthosite which is associated a number of bodies of ilmenitic magnetite. During the summer of 1937, the E. I. duPont de Nemours Corporation obtained options on a group of properties thought to contain several such deposits. In connection with the exploration of the...

The Monte Cristo mining area was discovered in the early days of mining in California, and intermittent attempts have been made to work it to the present time. The gold is localized in lenticular quartz veins replacing fractured country rock along north-south fault zones. Pyrite is the principal ore mineral with magnetite and minor amounts of s...