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Location: 95 km E from Newman, Western Australia, Australia
Unit 38, 460 Stirling Highway, Peppermint GrovePerthWestern Australia, Australia6011
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Oakover is situated in the Collier Basin near the edge of the Pilbara Craton. A major portion of the tenement is covered by Quaternary cover with some calcrete along drainages. Several outcrops of the Middle Proterozoic Bangemall Group (Manganese subgroup), including various sediments of the Balfour Formation, Jigalong Formation and the Stag Arrow Formation are found on E52/3577 (Rohde, 2010).The manganese mineralisation occurs as multiple seams or bands of varying thickness within a highly weathered shale (Balfour Formation). The mineralisation was generally found to be shallow (mostly within 20 m of the surface), gently dipping and laterally extensive across the target area. The lateritic profile and subsequent manganese mineralisation show the zonation within the regolith and distribution of manganese mineralisation. The higher-grade (or nearer-surface supergene/lateritic) manganese material is generally located within the upper portion of the regolith profile at shallow depths (0–15 m).Basal lithologies at the project are manganiferous shale of the Balfour Formation, with total grades ranging from 5-10% Mn. Mineralisation is hosted with lenticular layers of ferruginous/manganiferours shale, within host silty/cherty shale.Mineralisation is generally constrained to lenses of varying tenor, forming a sub-horizontal, semi-continuous unit of mineralisation with internally variable grade. There is a visual and geochemically distinct difference between surrounding waste and mineralisation which permits relatively simple domaining. Mineralisation is generally laterally continuous over hundreds of metres.The higher grade semi-massive manganese domain is a sub-horizontal shale horizon that has been preferentially enriched with manganese oxides and is ~15 m thick. This domain sits beneath a thin veneer of waste shale (silty/cherty shale) that is generally unmineralized and ranges from 0-10 m thick. Grades of the semi-massive domain vary from 10-15% Mn. A surficial duricrust of supergene enriched lateritic manganese occurs discontinuously over the top of Sixty-Sixer and Karen deposits but is notably absent at Jay-Eye. This final mineralised domain is up to 15 m thick (though averages 2-5 m) and has grades that very widely up to 28% Mn.Drilling, logging and sampling for Sixty Sixer, Jay eye and Karen prospects reveals that mineralisation is generally coherent, with increased frequency of mineralized lenses coalescing to form massive to semi-massive bodies of manganese oxides within the shale. Units are reasonably continuous along and across strike averaging approximately 15 m thick. Mn grades range between 10% Mn and 14% Mn.DimensionsThe combined Sixty-sixer and Jay-Eye deposits have been drilled over a strike length of 4,000 m in a northeast-southwest direction. Drilling at Sixty-sixer extends approximately 900 m across strike, and 600 m at Jay-eye. Drilling at Karen extends approximately 1,000 m along strike (northeast-southwest) and approximately 800 m across strike.Mineralisation at all deposits extends to depths of approximately 50 m and varies in thickness from section to section, averaging 15-20 m.
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