Eclipse gold prospect, Mertondale Goldfield, Leonora Shire, Western Australia, Australia
Latitude & Longitude (WGS84): | 28° 35' 41'' South , 121° 32' 45'' East |
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Latitude & Longitude (decimal): | -28.59482,121.54609 |
GeoHash: | G#: qdymmf7pj |
Locality type: | Prospect |
KΓΆppen climate type: | BWh : Hot deserts climate |
The Eclipse gold prospect is approximately 35 kilometres north-east of Leonora, and east of the Leonora-Nambi Road. The Tonto gold prospect is immediately to the south.
It is located in the west branch of the Mertondale Shear Zone. The deposit has a different geology to the nearby Tonto prospect. Mafic mylonite is present but discontinuous, whereas quartz-dolerite is not restricted to the Footwall, and appears within the central mafic unit. Shale is commonplace.
There is a shallow flat dipping horizon of sulphidic quartz veining for 150 metres in length in the south to central portions of the prospect, containing arsenopyrite and pyrite, within quartz, and containing high gold values.
At the north end of the prospect, is felsic volcanic and alternating mafics. Granite porphyries, relatively unsheared chloritic basalt, a high magnesium basalt associated with andesite and dolerite, also occurs in the area. The north end also shows epithermal alteration.
There are several 100 metre long, north-south trending, massive fresh sulphide bodies at depth, with a distinctive gossan forming in the oxide area. The gossan is light blue sugary quartz, black quartz, and iridescent goethite/hematite.
The estimated JORC resource is 0.87 Mt at 1.8 g/t yielding 49 000 ounces of gold.
Mineral List
6 valid minerals.
Rock Types Recorded
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Alphabetical List Tree DiagramRegional Geology
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
Quaternary 0 - 2.588 Ma ID: 917228 | colluvium 38491 Age: Pleistocene (0 - 2.588 Ma) Description: Colluvium and/or residual deposits, sheetwash, talus, scree; boulder, gravel, sand; may include minor alluvial or sand plain deposits, local calcrete and reworked laterite Comments: regolith; synthesis of multiple published descriptions Lithology: Regolith Reference: Raymond, O.L., Liu, S., Gallagher, R., Zhang, W., Highet, L.M. Surface Geology of Australia 1:1 million scale dataset 2012 edition. Commonwealth of Australia (Geoscience Australia). [5] |
Neoarchean - Mesoarchean 2500 - 3200 Ma ID: 3188638 | Archean volcanic and intrusive rocks Age: Archean (2500 - 3200 Ma) Comments: Yilgarn Craton Lithology: Greenstone belt; mafic-ultramafic volcanic rocks Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154] |
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