The Huckleberry prospect lies in the south-eastern section of the WUSA Gold project area. The prospect was initially defined by the surface/mineral rights holder in the late 1980’s to early 1990’s, and drilled for the first time by Mawson Gold Ltd in 2018 with two effective holes.
Huckleberry is characterised by a large area of hypogene acid-sulphate alteration covering 1km x 300m along northeast trending strike. The zone of alteration is controlled by a shear zone that effects a series of predominantly andesite and rhyolite domes of Oligocene-Miocene age (Little Butte Volcanic Series). The main feature of interest is an 800-metre-long ridge with regular out crop of vuggy silica alteration. These ridges show an en echelon pattern suggesting a N-S trending shear may be a controlling feature. Alteration is quartz-alunite-clay dominated, resulting in a high-sulphidation classification for the prospect. Alteration is strongest associated with the andesite/rhyolite plugs but extends into wall rock.
Surface sampling during the 1980s/90s defined anomalous concentrations of arsenic, antimony, mercury, bismuth, molybdenum and other elements often associated with acid-sulphate epithermal style gold deposits. Interpretation from both surface and drill geochemistry is that the current area of exposure and testing corresponds with an acid leached vuggy silica zone, possibly above a deeper epithermal deposit.
Rockchip samples collected during 2017 exploration mapping by Mawson Gold Ltd contained geochemically anomalous As, +/- Hg, and Mo. Some of the stream sediment samples collected along the forks of Mosby Creek down-stream from Huckleberry were anomalous of Au, Hg and As and placer claims have been located to the north of Huckleberry. Despite strong alteration and highly anomalous pathfinder geochemistry, no significant gold mineralization has been located at Huckleberry in surface rock chips or drilling.
Drill holes HDH001-18 and HDH003-18 by Mawson Gold Ltd in 2018 targeted zones of mapped silicification alteration and associated anomalous geochemical zones (As, Hg, Mo, Bi, Sb) in rock chip geochemistry.
Drilling at Huckleberry provided evidence of an association between high- or intermediate-sulphidation epithermal style alteration with strongly elevated values of pathfinder elements, e.g. sulphur, arsenic, antimony, tellurium, selenium, bismuth and molybdenum. Drilling did not intersect significant values of Au and Ag, however higher values may lie within the intense alteration system at greater depth than targeted in HDH001-18 and HDH003-18.
In HDH-001-18, a total of 30 samples each 1.5m in length were taken between 201.2 m and 385.57 m for a combined length of 45.7 m. The 30 samples averaged: 0.13 g/t Ag, 321 ppm As, 6.9 ppm Sb, 4.8 ppm Te.
Drill hole HDH003-18 (280 m) encountered strong alteration, including silicification down to 64 metres and argillic and possibly advanced argillic, as well as propylitic, based on core logging and geochemistry. The silicified zone also has strongly anomalous As, Sb, Bi and to some extent Mo, but with background values of Au and Ag. Best result was: HDH-003-18 54.9 metres @ 0.13 g/t Ag, 309 ppm As, 46 ppm Sb and 5.0 ppm Te from 36.6 metres.
At deeper levels the site has potential for either, both steep dipping structurally controlled bodies in a northeast orientation, or flat lying bodies within a permissive pyroclastic horizon that is known to occur more regionally at depth.