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Location: 340 Km W from Townsville, Queensland, Australia
Level 21, Matisse Tower 110 Mary StreetBrisbaneQueensland, Australia4000
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The main styles of gold mineralisation in the area are epithermal and meso-thermal systems, which are generally associated with multiple intrusive phases associated with the Robertson Fault Zone. Narrow-vein mining has also previously taken place within the Forsayth area along or adjacent to the fault traces. The Robertson Fault Zone is recognised as one of the main controlling features for mineralisation in the region. Big Reef is expected to be the first of a number of satellite pits outside of the main Agate Creek mining area that are planned to be opened and mined in parallel with operations at Agate Creek.Agate CreekGold mineralisation at Sherwood is a low-sulphidation, adularia-sericite type epithermal system genetically related to the emplacement of Permo-Carboniferous porphyritic rhyolite and andesite extrusives and intrusives. Most mineralisation occurs within the Robertson Fault Zone, at the intersection of the Robin Hood Fault and is spatially associated with (and often within) rhyolite. The mineralised zones are interpreted as boiling outflow zones, likely fossil geysers. The Agate Creek Fault forms the eastern boundary to mineralisation but remains open in all other directions and at depth.There are two principal mineralised areas identified at Sherwood and Sherwood West.Mining at Sherwood has followed a shallow NW dipping lens of mineralization that is 250 m long by 50 to 100 m wide and 2 to 8 m thick.Agate Creek mineralisation is epithermal is style and associated with quartz veining. Both grade and quartz logging are used to aid geological interpretation in additional to geological contacts between the rhyolite and granite which are proximal and parallel to the main mineralisation at Sherwood West and the upper mineralisation at Sherwood.Quartz veining is dominantly near horizontal at Sherwood and dip at 30º to the east at Sherwood West and on Sherwood flanks. The metals are zoned around the shallow dipping rhyolite sills that localise the mineralisation:• Molybdenum (Mo)/Tungsten (W) correlated well with the high grade zone often with an Arsenic (As)/Antimony (Sb) shell;• The metal zoning pattern is a rhyolite – rhyodacite related system;• Polymetallic W-Mo-Bi system with best gold (Au) in the As-Sb-Au-Ag-Se (Mo Tl Sb) association;• Distinct metal zoning demonstrated around the Au ore at dyke tips.DimensionsSherwood comprises mostly sub-horizontal quartz veins and mineralisation with the main zone containing veins spread over a core/overall area of 370/600 m NE-SW by 300/500 m NW-SE by 300 m RL. It is bounded to the East by the Agate Creek Fault a vertical NNW-SSE system with some vertical mineralisation.Sherwood West is predominately a single zone dipping 30° to the east and up to 800 m N-S by 500 m E-W and 20 m in vertical thickness in the main zone but there are several parallel hanging wall veins and mineralisation at the steep dipping Zig Zag Fault.Sherwood South comprises an E-W vertical vein with possibly a flat blowout zone with limited overall extent.Big ReefBig Reef mineralisation is shear hosted between granite and metamorphic blocks defining a long near vertical zone of mineralisation. The Mineral Resource is defined over an 840m strike length and to a depth of 40m and is only 2m to 3m wide. Long term potential remains for narrow (<1m), higher grade (>10 g/t Au) sulphide ore below 50m depth at Big Reef and below 25m depth at the “Tunnel”. However, this requires drill testing and it is considered that there is more chance of identifying near surface oxide resources at the adjacent Big Reef Extended prospect.
