|Latitude & Longitude (WGS84):||30° 44' 33'' South , 121° 28' 47'' East|
|Latitude & Longitude (decimal):||-30.74250,121.47966|
|Köppen climate type:||BSh : Hot semi-arid (steppe) climate|
A gold mine owned by Homestake Mining Co. (48%) and Kalgoorlie Mining Assoc. Workings feature a 1,200 meter deep shaft. 394,000 tons ore yielded 1,700 kg Au (1984).
(2013) mine half owned each by Barrick Gold and Newmont who also own and operate the Superpit nearby. Located at the top of Hannan Street and very near the town, and the original gold discovery by Paddy Hannan. Named after the hill the mine is on, and has been mined almost continuously from around 1894. The orebodies are Charlotte, and Reward, with satellite orebodies Maritana and North Charlotte. The mine is very near the Golden Mile, and accesses the same geology, but is viewed as separate from the old historic Golden Mile mines.
The gold occurs in quartz vein systems, as a series of steeply plunging pipe-like vein stockwork orebodies in metagabbro of the Golden Mile dolerite. The Fimiston and Oroya Lodes (see Fimiston Mindat locality) cut the ore. The mineralisation is controlled by district scale north north-east trending strike slip faults.
The Charlotte orebody goes down 800 metres from the surface, 250 metres north-south, and up to 100 metres east-west. Reward extends 800 metres down from the surface, 250 metres north-south, and 50 metres east-west. Both are restricted to units in the host sill and adjacent to major steeply dipping faults that have cut the sill. There is gold in pyrite or pyrrhotite bearing metagabbro around the veins, and to a lesser degree free gold in the veins, and along the vein margins. The pyrite zones contain carbonate-pyrite-pyrrhotite-muscovite-arsenopyrite, with tellurides virtually absent. Pyrite is found as scattered grains 1 to 2 mms wide. Gold is found at the margins of the quartz veins, or bordering pyrite crystals, and along fractures in pyrite grains.
Silver rich D2 shear zones as part of the Golden Mile Fault at level 22 is described in one source, with tellurides hessite and altaite.
The stockwork of veins tends to be thin, but grouped together form ore shoots tens of metres wide, hundreds of metres in strike (east-west) and depth.
Veins developed during brittle fracture, resulting from movement on the Charlotte, Reward and Maritana Faults and then extended by hydrofracturing during the ingress of the mineralised fluids, and channelled by oblique faults.
Mineralisation in fractures is confined to the granophyric Unit 8 of Golden Mile Dolerite, including veins 2 to 20 cms thick, averaging 8 cms, densely packed with less than 1 metres separating them. Alteration zones cover up to 100 cms from the veins.
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
30 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
GeochronologyMineralization age: Neoarchean : 2695 ± 16 Ma to 2602 ± 8 Ma
Important note: This table is based only on rock and mineral ages recorded below and is not necessarily a complete representation of the geochronology, but does give an indication of possible mineralization events relevant to this locality. As more age information is added this table may expand in the future. A break in the table simply indicates a lack of data entered here, not necessarily a break in the geologic sequence. Grey background entries are from different, related, localities.
|Geologic Time||Rocks, Minerals and Events|
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
0 - 2.588 Ma
Age: Pleistocene (0 - 2.588 Ma)
Comments: regolith; synthesis of multiple published descriptions
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). 
|Neoarchean - Mesoarchean|
2500 - 3200 Ma
|Archean volcanic rocks|
Age: Archean (2500 - 3200 Ma)
Comments: Yilgarn Craton
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.