THE CLAIM IS UNDERLAIN BY A NORTHWESTERLY STRIKING AND STEEPLY SOUTH WESTERLY DIPPING, COMPLEXLY FAULTED PACKAGE OF INTRUSIVES AND SEDIMENTARY ROCKS. FAULTED ROCK SLICES INCLUDE TRACHYTE, SYENITE, RED UPPER PURCELL SANDSTONE, GREEN SILT- STONE, YELLOWISH DOLOMITIC SILTSTONE, FLATHEAD QUARTZITE AND SANDSTONE, ELKO MOTTLED DOLOMITE AND LIMESTONE, AND OTHER FORMATIONS. THE AGE RANGES FROM PROTEROZOIC TO MESOZOIC. ALL ROCKS ARE VARI- OUSLY ALTERED, INCLUDING SILICA, PYRITE, CLAY, HORNFELS, AND SKARN, AND BRECCIATED. OCCURING WITH PYRITE ARE PURPLE FLUORITE, BARITE, GALENA, SPHAL- ERITE, MINOR CHALCOPYRITE AND CHALCOCITE.