Geologic description
The country rocks in the area of this prospect are pelitic metasedimentary and subordinate andesitic (greenstone) metavolcanic strata of the Jurassic or older Mesozoic Hazelton Group, which is underlain and locally intruded by the Triassic Texas Creek Granodiorite (Smith, 1977; Koch, 1996). Buddington (1929, p. 72) describes two types of deposits at this site. One deposit is a sulfide replacement mass in somewhat schistose greenstone near the contact of a quartz porphyry dike. The mass consists of pyrrhotite and a little chalcopyrite and arsenopyrite. Some sulfides also are disseminated in quartz in the same zone. The other type of deposit comprises two parallel quartz veins up to 7 feet thick that locally form breccias with the quartz porphyry or greenstone country rocks. Some of the country rock fragments in the breccias are impregnated with pyrite and a stringer in the greenstone carries a little disseminated sulfide. Surface exposures of the veins carry a little calcite but are mostly barren of sulfides. |
