APPROXIMATELY LOCATED IN OR AROUND THE VIRGIN VALLEY MINING DISTRICT; USBM IC-6995 RECONNAISSANCE OF MINING DISTRICTS IN HUMBOLDT COUNTY, NEVADA; SITE NAME: VIRGIN VALLEY OPAL FIELD; COMMODITY: OPAL, BLACK OPAL; AUTHOR: VANDERBURG, W.O.
Summary
APPROXIMATELY LOCATED IN OR AROUND THE VIRGIN VALLEY MINING DISTRICT; USBM IC-6995 RECONNAISSANCE OF MINING DISTRICTS IN HUMBOLDT COUNTY, NEVADA; SITE NAME: VIRGIN VALLEY OPAL FIELD; COMMODITY: OPAL, BLACK OPAL; AUTHOR: VANDERBURG, W.O.