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Location: 96 km NW from Inhosy, Madagascar
12 Anderson StreetPO Box 28, 3353BallaratVictoria, Australia3350
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Bekisopa is located within the Anosyen Domain and Ikalamavony sub-domain of Madagascar. The local geology consists of a calc-silicate unit within schists and gneisses. The calc-silicate unit appears to be a favourable host for deposition of iron mineralisation from metasomatic fluids derived from either magmatic or metamorphic processes. Broad layers of massive magnetite–hematite are traceable over the entire 6km extent of the overall Bekisopa tenements. Mineralisation is interpreted as a series of parallel layers of predominantly massive magnetite-hematite with thicknesses of a few metres up to 20-50m, within the magnetite bearing host rocks. Disseminated mineralisation is also present and includes both coarse and disseminated types.The mineralisation has the form of a tabular zone or zones and trends from steeply westerly dipping in the north to moderately westerly dipping in the centre and moderately to flat dipping in the south. Some large - scale faults have been interpreted; however, small scale faulting has not been identified with the current drill spacing.Oxidation is variable, but generally complete oxidation is between 5m and 20m below surface. There has been some iron enrichment in the oxidised zone due to removal of host rock material via weathering, resulting in the presence of enriched iron mineralisation in the upper, completely oxidised zone and in surficial scree derived from this material. Transitional and primary mineralisation is found below the oxidised zone. Iron mineralisation occurs dominantly as magnetite although some hematite is noted, in particular near surface.Iron mineralisation at Bekisopa is believed to be of metasomatic origin and preferentially hosted by calc-silicate rocks within a high-grade metamorphic sequence. The Bekisopa deposit exhibits similarities to Algoma-style Banded Iron Formations (BIFs), Iron Oxide Apatite (IOA), Iron Oxide Copper Gold (IOCG) and iron skarn deposits. Further investigation (including drilling and petrology) is required to better understand and classify the Bekisopa deposit.