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Mt Magnet District - Hill 50, Morning Star, Saint George, Galtee More, Hill 60, Eclipse |
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Western Australia, WA, Australia |
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Au
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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The Hill 50 gold mine has been the major producer in the Mount Magnet district in the Murchison Province of the Archaean Yilgarn Craton. It located some 560 km ENE of Perth, in Western Australia.
The Hill 50 gold deposit is hosted by a sequence of ultramafic, mafic and felsic volcanics, interbedded with volcanogenic sediments, predominalty banded iron formations. The iron formations comprise alternating <1 to 10 mm thick laminae of microcrystalline quartz, iron oxides and carbonates. The greenstone belt has been complexly deformed into a domal structure, faulted against younger sediments to the east, and invaded and flanked by granitic stocks and batholiths and deformed gneissic granitoids.
Two main types of mineralisation are recognised, namely:
1). Iron formation hosted mineralisation which had yielded 55.4 tonnes of Au to 1990 at a recovered grade of 10.1 g/t Au, and
2). Quartz vein mineralisation composed of a). intensely deformed pre-peak metamorpism basalt hosted vein systems, b). late stage ultramafic and mafic hosted veins in shears. These styles produced13.7 t Au at an average recovered 11.3 g/t Au.
Production from the Mount Magnet district had totalled 6.68 Mt of ore for 69 tonnes of gold at a recovered grade of 10.3 g/t Au to 1990.
Hill 50 produced 3.4 Mt of ore for 43.2 t Au at a recovered grade of 12.6 g/t Au (BIF).
The next largest producers in the district were:
Morning Star - 0.947 Mt of ore for 7.27 t Au @ 7.7 g/t Au (quartz vein),
Saint George - 0.537 Mt of ore for 2.40 t Au @ 4.5 g/t Au (chert/BIF),
Galtee More - 0.449 Mt of ore for 1.90 t Au @ 4.2 g/t Au (chert/BIF),
Hill 60 - 0.360 Mt of ore for 1.84 t Au @ 5.1 g/t Au (BIF),
Eclipse - 0.048 Mt of ore for 1.80 t Au @ 37.4 g/t Au (BIF),
Water Tank Hill - 0.217 Mt of ore for 1.30 t Au @ 6.0 g/t Au (BIF).
Reserves for more recent developments include:
North Morning Star (Parkinson Pit) - 3.1 Mt @ 3.2 g/t Au (measured+indicated resource to 100 m @ 0.5 g/t Au cut-off, 1990),
Saint George - 0.229 Mt @ 5.9 g/t Au (measured+indicated resource to 80 m @ 1.0 g/t Au cut-off, 1988),
Galtee More - 0.653 Mt of ore for 2.62 tonnes Au (production from 1985-1989, partly included in historic production listed above).
For detail consult the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 1990.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Selected References:
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Balde R, Woolfe T I 1990 - Saint George Gold deposit, Mount Magnet: in Hughes F E (Ed.), 1990 Geology of the Mineral Deposits of Australia & Papua New Guinea The AusIMM, Melbourne Mono 14, v1 pp 255-258
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Thompson M J, Watchorn R B, Bonwick C M, Frewin M O, Goodgame V R, Pyle M J, MacGeehan P J 1990 - Gold deposits of Hill 50 Gold Mine NL at Mount Magnet: in Hughes F E (Ed.), 1990 Geology of the Mineral Deposits of Australia & Papua New Guinea The AusIMM, Melbourne Mono 14, v1 pp 221-241
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Wilson a C 1990 - North Morning Star ( Parkinson Pit ) Gold deposit, Mount Magnet: in Hughes F E (Ed.), 1990 Geology of the Mineral Deposits of Australia & Papua New Guinea The AusIMM, Melbourne Mono 14, v1 pp 249-253
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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