Magnet Mine, Magnet, Waratah district, Waratah-Wynyard municipality, Tasmania, Australia
|Latitude & Longitude (WGS84):||41° 25' 59'' South , 145° 25' 59'' East|
|Latitude & Longitude (decimal):||-41.43333,145.43333|
|Köppen climate type:||Cfb : Temperate oceanic climate|
The Magnet Mine, located at Magnet, a settlement that once existed 10km west of Waratah (30 km N of Dundas), was the largest silver-lead-zinc mine in the area, producing 27,000 tons of lead and 184 tons of silver from 1877 to 1940 (Haupt et al., 1995). The tailings were also reworked for 20-30,000 tons of zinc in the 1970’s.
The main siderite-dolomite-sulphide vein lies at the contact of a Cambrian mafic/ultramafic body called the Magnet Dyke (now mostly altered to an amphibolite), with Cambrian sedimentary host rocks (Groves and Solomon, 1964). The host rock near the lode contains relict chromite crystals in a matrix of chromian muscovite (fuchsite) and dolomite (Haupt et al., 1995). The primary lode is a strongly banded, breccia-style vein which comprises mostly sulphides and carbonates.
Although this crocoite-producing mine was discovered well before the Heazlewood mine, the mineral was not reported until after the find at the Heazlewood. Entangled masses of fine prismatic crocoite crystals to 5 cm and longer were found in the manganiferous gossan at Magnet. Small, loose, perfectly terminated crystals were less frequently found and in some vugs, it was associated with yellow cerussite or mimetite (colourless to yellow or red).
The gossan is still exposed in a small open-cut and the site is now a public fossicking reserve. Good specimens can still be found with some work, especially yellow and white cerussite.
28 valid minerals.
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
443.8 - 485.4 Ma
|Paleozoic sedimentary rocks|
Age: Ordovician (443.8 - 485.4 Ma)
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. 
|Series 2 - Terreneuvian|
509 - 541 Ma
|tholeiitic and boninitic lavas 37502|
Age: Cambrian (509 - 541 Ma)
Description: Low-Ti tholeiitic and boninitic lavas.
Comments: igneous mafic volcanic; synthesis of multiple published descriptions
Lithology: Igneous mafic volcanic
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).