Monarch Mine, Gullewa Goldfield, Yalgoo Shire, Western Australia, Australia
| Latitude & Longitude (WGS84): | 28° 39' 48'' South , 116° 18' 20'' East |
|---|---|
| Latitude & Longitude (decimal): | -28.66345,116.30569 |
| GeoHash: | G#: qdfsytgpr |
| Locality type: | Mine |
| Köppen climate type: | BSh : Hot semi-arid (steppe) climate |
The ore is hosted by interbedded BIF formations and amphibolite, folded about a north-east to south-west trend, dipping steeply south-east axial planes, intruded by south-east to south-west trending and south-east dipping shear.
The main mineralised zone coincides with very steep, north-east plunging and south-east fold nose of BIF. The shear zones dip less than the fold axis, and passes out of the fold at about the 100 metre level from the surface, which also marks the end of the mineralisation.
Gold is associated with sulphides, with or without quartz veining, in BIF and to a lesser extent the adjacent amphibolites. There is a distinct thickening of the mineralisation by supergene processes 30 to 40 metres below the surface now largely mined out. Below this the richer mineralisation occurs as small pods and tension fillings within a broad lens shaped zone that parallels the BIF.
Mineral List
2 valid minerals.
Rock Types Recorded
Select Rock List Type
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
| Archean 2500 - 4000 Ma ID: 776533 | mafic extrusive rocks 74255 Age: Archean (2500 - 4000 Ma) Description: Metabasalt, high-Mg basalt, tholeiitic basalt, carbonated basalt, agglomerate, mafic schist, dolerite, amphibolite; porphyritic basalt and dolerite; komatiitic basalt; mafic pyroclastics; minor mafic schist with granite intercalations 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). [5] |
| Neoarchean - Mesoarchean 2500 - 3200 Ma ID: 3188798 | Archean volcanic 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] |
Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License
References
