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Location: 33 km SE from Dongara, Western Australia, Australia
Ground floor 52 Kings Park RdPO Box 1925, WA 6872PerthWestern Australia, Australia6005
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The project area straddles the Dongara, Beharra Springs and Donkey Creek Terraces which are located to the west of the Dandaragan Trough and to the east of the Beagle Ridge. The Dongara Terrace is located to the west of the Mountain Bridge Fault. The Beharra Terrace lies between the Beharra Springs Fault and the Mountain Bridge Fault. The Donkey Creek Terrace lies to the east of the Beharra Springs Fault to the Eneabba Fault. The project area is located mainly between the Beharra Springs Fault to the east and the Mountain Bridge Fault which passes through the western tenement boundary. Both faults are east side down with the oldest lithologies to the west.Locally the silica sand deposit is understood to be layered where yellow sand is deposited it is underlain by white sand. The silica sand deposit is bounded at depth by a basal limestone which is closer to the surface in the south and deeper in the north.Silica sand mineralisation at Arrowsmith North occurs within the coastal regions of the Perth Basin, and the targeted silica sand deposits are the aeolian sand dunes that overlie the limestones and paleo-coastline. Within the project area, data obtained from the Department of Agriculture soil mapping shows there are pale (logged by VRX as white sands) and yellow deep sands predominating, with lesser swampy areas and occasional iron rich sand ridges. The aircore drilling demonstrated that the white sand layer extends to the west, past the interpreted contact, under the yellow sand in approximately the northern half of the modelled area. The basal surface of the yellow sand is defined by this lithological contact, or is limited by interpretation of nominal average thickness of the sand layer based on the data from surrounding deeper drill holes as required. The white sand layer basal surface is similarly defined by the drilling data and or is limited by interpretation of nominal average thickness of the sand layer based on data from surrounding deeper drill holes as required. The horizontal extents of the interpreted sand layers are limited to within the VRX nominated Arrowsmith North target area and with reference to the publicly available soil mapping data. The surface humus layer is typically about 300mm thick. In consultation with VRX, the upper 500 mm (overburden) is likely to be reserved for rehabilitation purposes. This overburden surface forms the upper boundary of the estimated Mineral Resource and is depleted from the reported Mineral Resources. Comparatively minor areas that are mapped as iron richer sand ridges, swamp or sandy swamp are also depleted from the Mineral Resources. A surficial zone of enriched CaO was modelled in the area drilled in 2021. This CaO zone is within the yellow sand domain and SiO2 population is reduced by negligible amounts compared to the non-calcareous domain. The purpose of the domain was to separate high and low grade CaO populations. The basal 2 m of the sands unit is not intended to be mined, and is therefore not reported as part of the Mineral Resource. Despite both white and yellow sands being readily amenable to beneficiation, they have been separately modelled, based on the drill logging data and mapped soil type boundaries, as they are separately estimated due to differences in grades of the various mineral components. Assumptions have been made on the horizontal extents of the mineralisation based on the soil mapping data and the spacing and extents of the drilling information. The nominal maximum interpreted combined layer sand vertical thickness is roughly 25 m and the nominal average interpreted thickness of sand is about 12 m. Approximately 15% of the modelled mineralisation zones can be considered to be extrapolated. Continuity of geology and grade can be identified and traced between drillholes by visual and geochemical characteristics. Confidence in the grade and geological continuity is reflected in the Mineral Resource classification.Dimensions The modelled and classified extents of the yellow sand material within the target area are roughly 10 km north to south, and on average roughly 2.5km west to east. The modelled and classified extents of the white sand material within the target area are roughly 4.6km north to south, and on average roughly 1.5km west to east. The modelled aeolian sand is roughly horizontal, with low relief. The currently modelled thickness of the sands is on average about 12m, ranging up to a nominal maximum thickness of 25m.
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