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Location: 160 km SE from Halls Creek, Western Australia, Australia
Ground Floor, 40 Kings Park RoadPerthWestern Australia, Australia6005
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The Browns Range (BRM) deposits including Wolverine are unconformity related HREE style deposits. They are located on the western side of the Browns Range Dome, a Paleoproterozoic dome formed by a granitic core intruding the Paleoproterozoic Browns Range Metamorphics (meta-arkoses, feldspathic meta-sandstones, and schists) and an Archaean orthogneiss and schist unit to the south. The dome and its aureole of metamorphics are surrounded by the Mesoproterozoic Gardiner Sandstone (Birrindudu Group). The Browns Range xenotime mineralisation is typically hosted in hydrothermal quartz and hematite veins and breccias within the meta-arkoses of the Archaean Browns Range Metamorphics. Various alteration styles and intensities have been observed; namely silicification, sericitization and kaolinite alteration.Local GeologyThe Browns Range project area lies in the northwest Tanami Region, straddling the border of Western Australia and the Northern Territory. The local geology consists of deformed volcano-sedimentary basement rocks of the Browns Range Metamorphics (BRM). These may be part of the Proterozoic Tanami Group 1885-1865 Ma or possibly an older Archean sequence 3000-2500 Ma.The BRM has been intruded by the Browns Range Dome (BRD) granite consisting of plutons of the Frederick and Grimwade suites 1820 1790 Ma. A sequence of mafic-ultramafic rocks also intrudes the BRM.The entirety is overlain unconformably and non-conformably by the minimally deformed Gardiner Sandstone, Birrindudu Group, 1735-1640 Ma.Wolverine Deposit GeologyThe Wolverine deposit is hosted in metasedimentary units of the BRM consisting primarily of metamorphosed siltstone, arenaceous units, and foliated conglomeratic units. The structural setting is moderately complex and a primary control on the hydrothermal system and related REE mineralisation. The Wolverine deposit is associated with a breccia-hosted hydrothermal system, which largely lies below a cover of transported clays, sand and gravels varying between 1 m to 10 m in thickness. Below this cover is an intensely weathered zone of mottled kaolinitic arenite, usually 1 m to 5 m thick.The dominant REE mineralisation is xenotime. The host rocks in the mineralised zone are silicified and brecciated along a structural zone with hematite and sericite alteration associated with the hydrothermal event.Additional REE minerals recognised to date are the light REE dominated florencite-goyazite series. These minerals comprise a minor but important component of the REE mineralisation relative to xenotime.The primary structural control on the hydrothermal system at Wolverine occurs at the intersection of two steeply dipping fault orientations, the Hamster -Capybara faults and the Kurts Cut-off fault. The hydrothermal fluid pathway is focused on the intersection of the fault orientations, which plunges steeply west. The deposit is oriented east-west and dips steeply north, extending over 400 m in strike, up to 40 m in width, and over 550 m in depth from surface outcrop, remaining open at depth.
