|Latitude & Longitude (WGS84):||30° 46' 15'' South , 121° 29' 38'' East|
|Latitude & Longitude (decimal):||-30.77097,121.49392|
|Köppen climate type:||BSh : Hot semi-arid (steppe) climate|
The Boulder North Extended Gold Mine was in the north-west portion of the Golden Mile. Considering some of the soap operas historic mines turn into, very little happens here apart from a lot of development work.
The Boulder North Extended Gold Mining Company was formed after a meeting in Adelaide in September 1895, with 90 000 pounds capital. The lease purchased was formerly controlled by the Kalgoorlie Gold Mining and Prospecting Syndicate. Block 1285.
A description of the lode was reported in 1898. Upon 200 feet, mineralised graphitic slate was reached, which continued to 300 feet, with cross bands of mineralised ironstone. On each wall was a solid rim of quartz, while smaller quartz veins crossed the lode. Gold was found closely clinging to the quartz both on the wall and across the lode. One chute was found with a solid half inch band of gold through it. Thick clusters of sulphides were found lower down.
Like many of the companies formed in 1895 on the Golden Mile, Boulder North Extended got to a point it had run out of development funds, and either the lodes found were not big enough to warrant investing in a 10 head battery, and/or shareholders were not willing to invest more funds. The company had been looking for other leases without success, but decided in 1903 to abandon its Kalgoorlie lease anyway.
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
2 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
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.