THE ROCKS ON THE FRED CLAIMS ARE MAINLY PORPHYR- ITIC VOLCANICS GRADING TO DIORITE, WITH ADJACENT SILICEOUS SEDIMENTS, AND A FEW SMALL GRANITIC OUTCROPS. THE SEDIMENTARY AND VOLCANIC ROCKS ARE MAINLY OF MESOZOIC AGE, WHILE THE GRANITES ARE OF LATE MESOZOIC TO EARLY TERTIARY AGE. THE REGIONAL STRUCTURE IS DOMINATED BY TRANSPOSITION OF PEN- DANTS OF THE OLDER METAVOLCANICS IN NORTHWEST STRIKING ATTITUDES. MANY OF THE VOLCANICS ARE LIGHTLY METAMORPHOSED, SOME TO AMPHIBOLITE FACIES YIELDING GREENSTONES. MINUTE TRACES OF SULPHIDES ARE UBIQUITOUS IN THE VOLCANICS BUT ALMOST ALWAYS THIS IS PYRITE. VERY RARELY PRESENT ARE TRACES OF CHALCOPYRITE, GALENA AND SPHALERITE.