The formation of volcanic-hosted massive-sulphide mineralization at Mineral Hill, New South Wales.

TL;DRAbstract

The Mineral Hill \volcanic-hosted massive-sulphide\" type copperlead-zinc deposits are located in central New South Wales Australia in the Tasman Orogenic Zone. The deposits formed in an Upper Silurian (?) sequence of felsic volcanics and pyroclastics and overlying siltstones sandstones mudstones and carbonates which have been affected by normal faulting gentle Mid-Devonian (?) upright folding and lower greenschist-grade metamorphism. Mineralization is of two types: (1) discordant near-vertical cylindrical stockworks delineated by high metal grades intense alteration and a zoned ore-mineral assemblage within felsic lapilli tuffs vitric tuffs and ignimbrites and (2) conformable massive-sulphide lenses (most of which have been affected by oxidation and leaching during weathering) and conformable hematitic chert lenses in sediments overlying the pyroclastic succession. Massive ore lenses exhibit banded interlayering of ore with chert and in some areas are highly brecciated. Unoxidized mas

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