The Platinum Deposits of California.

Progress, Volume II, Issue 11, 2 September 1907, Page 408

The Platinum Deposits of California.

Members of the U. S. Geological Survey, who are now in San Francisco, are investigating the recent discoveries of platinum in several counties in California. A bulletin will soon be issued on the tests of black sands which were conducted on the Pacific coast and elsewhere more than a year ago. The enquiry was started originally for the purpose of locating rich deposits of platinum. The investigation developed that there is platinum in 120 places in the United States ; but that some of the largest and most profitable fields for commercial exploitation are in Del Norte, Siskiyou, and Trinity counties, in California. Platinum is also found in considerable quantities in Plumas and Butte counties.