Holmes prospect, Jervois Range, Jervois Station, Central Desert Region, Northern Territory, Australia
|Latitude & Longitude (WGS84):||22° 43' 10'' South , 136° 13' 41'' East|
|Latitude & Longitude (decimal):||-22.71956,136.22830|
|Köppen climate type:||BWh : Hot deserts climate|
Cu-W anomaly. (Plenty River Mining Co. NL) maps provide little detail over the location of the deposit, but accepting the existing Mindat location, based on information at Northern Territory Govenment STRIKE database(Spatial Territory Resource Information Kit for Exploration), places the deposit about 3 kilometres south of the Bellbird Mine, and main J structured syncline, that most of the deposits in this area are situated in. A line of east-west outcropping on flat plains can be seen near the Mindat map location, matching the description. This source indicates the Wards Prospect listed separately is part of the same lode horizon.
The prospect is marked by a series of banded iron formation outcrops, along a 4500 metre length. Banded iron formation is not characteristic of the lodes in the main J structure deposits. The banded iron formation at Holmes is not associated with the Cu-W mineralisation formation.
The lode horizon contains magnetite-chlorite-quartz, banded iron formation, and malachite staining of surface outcrops, enclosed by quartz-sericite and knotted schist, impure marble, epidote-quartzite beds, amphibolite and quartz-tourmaline rock.
Scheelite is noted along a length of 96 metres, up to 0.6 metres wide, and as discontinuous mineralisation for a total of 600 metres. Surface malachite is the only copper noted, however other species may exist at depth but remains un-explored.
10 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
1600 - 2500 Ma
|Paleoproterozoic crystalline metamorphic rocks|
Age: Proterozoic (1600 - 2500 Ma)
Comments: Arunta Block
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. 
1800 - 2050 Ma
Age: Orosirian (1800 - 2050 Ma)
Stratigraphic Name: Bonya Schist
Description: Muscovite, biotite and two-mica schists, some with andalusite, sillimanite or garnet; calc-silicate rock; metapelitic and meta-acidic volcanic rocks; amphibolite; skarn-like rock; magnetite quartzite; rare migmatite.
Comments: metasedimentary siliciclastic; synthesis of multiple published descriptions
Lithology: Metasedimentary 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).