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Emily Ann |
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Western Australia, WA, Australia |
| Main commodities:
Ni
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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The Emily Ann deposit is part if the Lake Johnston operations and is 3 km north of the Maggie Hays deposit. It is located approximately 540 km east of Perth in Western Australia, within the Archaean Yilgarn Craton, and lies within the Lake Johnston greenstone belt, between the Southern Cross-Forrestania belt to the west and the Norseman-Wiluna belt to the east.
The deposit comprises a series of northerly striking nickel sulphide units which have been divided into two mineralised zones, known as the upper and lower mineralised horizons.
The upper mineralised horizon comprises fault associated, disseminated and stringer sulphide ore hosted by a lenticular ultramafic host that dips steeply to the east and strikes grid north. The lower mineralised horizon, which strikes grid northwest and dips shallowly to moderately to the northeast, is composed of massive sulphide ore that is predominantly hosted by felsic rocks with minor associated ultramafic zones. The convergence of the two horizons resembles a recumbent synform that plunges shallowly to the northeast.
The shallower portions of the mineralisation plunges to the north and is associated with ultramafic rocks. It comprises variable concentrations of disseminated to matrix sulphide with minor massive sulphide stringer veins. Down-plunge to the north, the proportion of ultramafic rocks diminishes and becomes subordinate to the felsic rocks as the main host to the mineralisation.
Total Measured + Indicated + Inferred resources at Emily Ann at the end of 2003 were:
1.597 Mt @ 3.30% Ni.
Emily Ann was purchased by Norilsk Nickel as a result of the LionOre Mining International Limited acquisition on 28 June 2007 and is part of the Lake Johnston operation.
The most recent source geological information used to prepare this decription was dated: 2005.
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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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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