Mount Gee

Hill of altered granite showing containing a vertically zoned hydrothermal system. Primary granite alteration consists of haematite and quartz. The rocks at the base of hill exhibit about 10% by volume quartz veining. Those at the top of the hill 95% quartz veining. The granite is extensively brecciated showing both crackle vein and jigsaw fit textures. The qurtz veins are a stockwork of open spaces variably filled by crustiform, botryoidal, mammaliated and cockade textured quartz. The quartz is typically white but minor amounts of clear smokey and amethystine quartz crystals are present. Many of the coarse quartz crystals are clearly zoned. The veins of the upper half of the hill show contain nail-head quartz and pseudomorphs after platy calcite. The viens of the uppermost part of the hill contain internal sediments of haematitic jasper and graded beds of milled fragments, all of which commonly show displacement from their original orientation. Rare microbial filament impressions on quartz surfaces have been observed.