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Phosphate Hill, Mansfield, Mansfield Shire, Victoria, Australia

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Latitude & Longitude (WGS84): 37° 3' 37'' South , 146° 2' 16'' East
Latitude & Longitude (decimal): -37.06028,146.03778
GeoHash:G#: r1rv5jmkn
Locality type:Hill
Köppen climate type:Cfb : Temperate oceanic climate

Located 5km W of Mansfield, the Phosphate Hill deposit was first reported in 1904 while mapping for the Geological Survey was being carried out in the Mansfield district. The surface outcrop discovered contained radiating crystals of wavellite and a thin vein of pale blue turquoise. Preliminary excavations provided disappointing results, however in 1913 the workings were extended and proved to be economic. Between 1915 and 1919 most of the phosphate rock was extracted from open cuts and trenches. Material was also produced from several shafts which had proved the existence of phosphate rock to a depth of 27 metres. Between 1916 and 1926, 16 270 tonnes of rock containing 16% phosphate were extracted for low grade fertiliser. Operations ceased soon after due to deterioration in phosphate grade.
The main phosphorite horizon is about 3 metres thick and is overlain by a band of black chert forming prominent outcrops which act as an indicator for the phosphatic bed. The phosphate-bearing rocks in the excavations are generally pale grey and friable with a granular, sandy texture but may also be dense and fine-grained.

Mineral List

13 valid minerals.

Regional 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

358.9 - 419.2 Ma

ID: 740485
Norton Gully Formation, Yeringberg Formation

Age: Devonian (358.9 - 419.2 Ma)

Stratigraphic Name: Norton Gully Formation; Yeringberg Formation

Description: Marine turbiditic sandstone, siltstone, mudstone; minor conglomerate, diamictite

Comments: sedimentary siliciclastic; synthesis of multiple published descriptions

Lithology: Sedimentary siliciclastic

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]

Early Silurian - Cambrian
427.4 - 541 Ma

ID: 3185333
Paleozoic sedimentary rocks

Age: Paleozoic (427.4 - 541 Ma)

Comments: Lachlan Fold Belt

Lithology: Sedimentary 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]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

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W D Birch & D A Henry 1993. Phosphate Minerals of Victoria. The Mineralogical Society of Victoria special publication No.3 pp. 67-77

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