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The Geochemistry and textures of the Grevillea Gossan, Northwest Queensland


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Hann, V 1999 , 'The Geochemistry and textures of the Grevillea Gossan, Northwest Queensland', Honours thesis, University of Tasmania.

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The Grevillea deposit is a newly discovered Pb-Zn-Ag stratabound sediment-hosted
deposit in the Lawn Hill Region of NNW Queensland. It lies in part of the Mount Isa
Inlier which has been described as one of the richest mineral provinces in the world.
The study undertook varied geochemical analyses for determining element variations and
the relationships, and elemental partitions in the regolith units. It was found that TI, Pb, Si,
Fe are surface indicators of mineralisation for the Grevillea deposit. Two types of rock
units dominated the regolith, which overlies the massive pyrite zone: the jarosite limonites
and the hematite limonites, and both act as sponges for metals derived from the ore. The
jarosite types in the area are likely plumbojarosite and argentojarosite.
Textures were also studied in outcrop, on a handspecimen scale, and on microscopic scales
to search for evidence of primary sulfides. Sections of ore sample were studied and some
links were made to surface textures. These included sedimentary features, bladed and
platey hematite, and framboidal structures. Light rare earth minerals (monazites) in the
core were an unexpected unusual find as they are not normally associated with sedex style
deposits. The monazites may have useful application in dating the deposit or gossan

Item Type: Thesis - Honours
Authors/Creators:Hann, V
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