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Deposit Synonyms
Ml 5617; Ml 5618; Mount Hutton; Mpl 37
Mineral District
Leigh Creek-Willouran Magnesite
Deposit Summary
86 individual magnesite beds identified within steeply dipping magnesite and dolomite interbeds for ~24.5km of strike. Resource ~143.3Mt FOR Mt Hutton & Mt Hutton South areas combined.
Deposit Description
MOUNT HUTTON CENTRAL, magnesite deposit located 20 km NW of Leigh Creek township and 5 km SE of the Myrtle Springs mine. It comprised a steeply dipping sequence of magnesite and dolomite interbeds, which outcropped continuously throughout Mining Lease 6092. These beds trended NW, dipped 60-70 NE. A total of 86 individual beds were identified within the package, which extended over a strike length of 24.5 km. Structural mapping within ML 6092 (formerly MCs 3098, 3099 and 3100) at Mount Hutton was completed in August 1999. SAMAG also commissioned Fugro to conduct a detailed (1:10,000 scale) aerial photography and photogrammetric survey of the Mount Hutton Mineral Claims, and the ore haul road route, in August 1999. The accurately located digital photographs and contours were combined with geological mapping data to form a comprehensive Geographical Information Systems (GIS) dataset.
In April 2001, Minarco was commissioned by SAMAG Limited to undertake a geological, mining and resource study of the Mount Hutton (ML 5617) magnesite deposit. Borehole data compilation, geological modelling and resource estimation was subcontracted to ECS International. Minarco carried out validation of the geological model, and all mining related work. The JORC Code compliant resource was 113.3 million tonne (Mt), including 18.3 Mt of measured resources, 42Mt indicated, and 53Mt inferred. Metallurgical testwork includes floation tests using different grind sizes. The results demonstrate that high grade magnesia can be produced via comparatively simple, low-cost processes.
On 12/4/2016 Archer Exploration announced an updated JORC resource for the Mount Hutton Central, which refers to a ~2.4km strike length of magnesite-bearing beds extending from AMG 6628411mN to 6626004mN. The 2016 resource update indicated no material change from an earlier 2012 estimate by SAMAG. The resource is 17,523,000 tonne at 24.2%Mg, or 40.2% MgO. Testwork was completed on samples from Bed 9 to examine preferential segregation of MgO in rock grind size fractions, with the aim to reduce silica content to ~1%. Results to date have been unsuccessful
Discovery Year
?
Commodities
Magnesite, Dolomite, Magnesium Oxide
Ore Minerals
Magnesite
Gangue Minerals
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