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Location: 65 km SW from Las Vegas, California, United States
Level 29, 2 Chifley SquareSydneyNew South Wales, Australia2000
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The Colosseum project is hosted by Proterozoic granites, gneisses. These were intruded by Tertiary age rhyolitic stocks, dykes and breccias. The gold mineralisation occurs in a number of different breccia pipes with both sedimentary and volcanic rock fragments. Gold is associated with pyrite within the breccia pipes.The Colosseum deposit style is a hydrothermal breccia pipe with a combination of epithermal mineralisation at original higher levels and mesothermal mineralisation at the lower levels.The deposit itself is associated with the emplacement of a breccia complex into Precambrian gneissic basement rocks. The complex is comprised of two felsite breccia pipes that form a northeast-southwest elongate zone, which contains mineralised zones of disseminated auriferous pyrite.Gold at the Colosseum deposit is generally sub-microscopic and associated with sulphide mineralisation, chiefly pyrite. It occurs as free gold, with minor alloyed silver. Gold is primarily in contact with pyrite, in fractures in the pyrite or along pyrite grain edges. It also occurs as isolated particles in quartz and other gangue minerals but spatially always close to pyrite but rarely as particles encased in euhedral pyrite.DimensionsThe Mineral Resources have an 800m by 800m surface extent. With two separate bodies 200x200m. The mineralisation is exposed at surface and the Mineral Resources continue to a depth of approximately 300m below surface at an RL of 1410m.The lower limit to the Mineral Resource is an arbitrary one being the result of a supplied pit shell from a cursory pit optimisation study. The mineralisation is open at depth and laterally to the southeast, beyond the North Pit zone.
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