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Ripon Hills manganese prospects, Ripon Hills District, East Pilbara Shire, Western Australia, Australiai
Regional Level Types
Ripon Hills manganese prospectsGroup of Prospects
Ripon Hills DistrictMining District
East Pilbara ShireShire
Western AustraliaState
AustraliaCountry

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Key
Latitude & Longitude (WGS84):
21° 12' 54'' South , 120° 44' 13'' East
Latitude & Longitude (decimal):
Locality type:
Group of Prospects
Köppen climate type:


The main group of deposits cover an area 6 kilometres by 5 kilometres, north of the Ripon Hills Road, between the Nullagine River and Yilgalong Creek crossings.

Longeach Oil Ltd formed a subsidiary called the Longreach Manganese Pty Ltd (in another source Longreach Metals NL, and in another Australian Longreach Metals Company).

The deposits were known from the 1950's, but extensively explored by Longreach Metals NL from 1968 to 1972. The company appeared on the verge of commercial production with a purchase agreement with Nippon Steel. The tenements, plant and equipment had been purchased from the Mount Sydney Manganese Pty Ltd at Woodie Woodie. However, it appears to have come to nought. In 2009, the deposits were explored by Jupiter Minerals.

Ripon Hills is a dissected fault plateau, formed by the uplift blocks of gently dipping Proterozoic shales, Pinjian cherts and Carawine dolomite. The shale is Mn and Fe enriched, with overlying chert breccia.

The ore deposits are Fe and Mn erratic supergene replacement of shale, and leaching of other minerals. The ore is fine grained pyrolusite, intergrown with fine grained hematite, with locally extensively altered bixbyite and braunite, cryptomelane, lithiophorite aggregates, hosted by kaolin.

At a cut-off rate of 20% Mn, the resource of 12 Mt, grading at 24.6% Mn, and 23% Fe. Much of the remaining deposit is low grade. In 1972, the proven resource was 20 Mt, with Indicated and Inferred resource of 50 Mt. It was also stated there was a small iron ore deposit of 10 Mt of 64-68% Fe.

It has been formed by the laterite weathering of Proterozoic ferruginous-manganiferous shales, forming supergene Fe-Mn ores in the upper 11 metres from the surface, caused by irregular substitution of the parent rocks by Fe and Mn oxyhydroxides during leaching and intensive removal of other components.

The old derelict processing plant remains, surrounded by overgrown piles of manganese, with various very small isolated manganese pits in the surrounding area. The site is not easily accessed, the track from the north off Warrwagine Road, rather than Rippon Hills Road. It goes for miles in a southerly direction along creeks, and through hills, and is likely in a poor state. The track continues west of the old processing plant onto the flats and for several kilometres to an unusual large, and equally little visited sinkhole.

Select Mineral List Type

Standard Detailed Gallery Strunz Dana Chemical Elements

Mineral List


7 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Bixbyite
Formula: Mn3+2O3
Reference: The Australian Institute of Mining and Metallurgy (1977), Investigation of the Ferruginous Manganese Deposits at Ripon Hills. Pilbara Manganese Province, WA, 1977
Braunite
Formula: Mn2+Mn3+6(SiO4)O8
Reference: The Australian Institute of Mining and Metallurgy (1977), Investigation of the Ferruginous Manganese Deposits at Ripon Hills. Pilbara Manganese Province, WA, 1977
Cryptomelane
Formula: K(Mn4+7Mn3+)O16
Reference: The Australian Institute of Mining and Metallurgy (1977), Investigation of the Ferruginous Manganese Deposits at Ripon Hills. Pilbara Manganese Province, WA, 1977
Hematite
Formula: Fe2O3
Reference: The Australian Institute of Mining and Metallurgy (1977), Investigation of the Ferruginous Manganese Deposits at Ripon Hills. Pilbara Manganese Province, WA, 1977
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: The Australian Institute of Mining and Metallurgy (1977), Investigation of the Ferruginous Manganese Deposits at Ripon Hills. Pilbara Manganese Province, WA, 1977
Lithiophorite
Formula: (Al,Li)MnO2(OH)2
Reference: The Australian Institute of Mining and Metallurgy (1977), Investigation of the Ferruginous Manganese Deposits at Ripon Hills. Pilbara Manganese Province, WA, 1977
Pyrolusite
Formula: Mn4+O2
Reference: The Australian Institute of Mining and Metallurgy (1977), Investigation of the Ferruginous Manganese Deposits at Ripon Hills. Pilbara Manganese Province, WA, 1977
'Wad'
Reference: The Australian Institute of Mining and Metallurgy (1977), Investigation of the Ferruginous Manganese Deposits at Ripon Hills. Pilbara Manganese Province, WA, 1977

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Bixbyite4.CB.10Mn3+2O3
Cryptomelane4.DK.05aK(Mn4+7Mn3+)O16
Hematite4.CB.05Fe2O3
Lithiophorite4.FE.25(Al,Li)MnO2(OH)2
Pyrolusite4.DB.05Mn4+O2
Group 9 - Silicates
Braunite9.AG.05Mn2+Mn3+6(SiO4)O8
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Unclassified Minerals, Rocks, etc.
'Wad'-

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
A2X3
Bixbyite4.3.7.2Mn3+2O3
Hematite4.3.1.2Fe2O3
AX2
Pyrolusite4.4.1.4Mn4+O2
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
Miscellaneous
Lithiophorite6.4.1.1(Al,Li)MnO2(OH)2
Group 7 - MULTIPLE OXIDES
(AB)2X3
Braunite7.5.1.3Mn2+Mn3+6(SiO4)O8
AB8X16
Cryptomelane7.9.1.2K(Mn4+7Mn3+)O16
Unclassified Minerals, Mixtures, etc.
Kaolinite-Al2(Si2O5)(OH)4
'Wad'-

List of minerals for each chemical element

HHydrogen
H Lithiophorite(Al,Li)MnO2(OH)2
H KaoliniteAl2(Si2O5)(OH)4
LiLithium
Li Lithiophorite(Al,Li)MnO2(OH)2
OOxygen
O PyrolusiteMn4+O2
O HematiteFe2O3
O CryptomelaneK(Mn74+Mn3+)O16
O Lithiophorite(Al,Li)MnO2(OH)2
O BrauniteMn2+Mn63+(SiO4)O8
O BixbyiteMn23+O3
O KaoliniteAl2(Si2O5)(OH)4
AlAluminium
Al Lithiophorite(Al,Li)MnO2(OH)2
Al KaoliniteAl2(Si2O5)(OH)4
SiSilicon
Si BrauniteMn2+Mn63+(SiO4)O8
Si KaoliniteAl2(Si2O5)(OH)4
KPotassium
K CryptomelaneK(Mn74+Mn3+)O16
MnManganese
Mn PyrolusiteMn4+O2
Mn CryptomelaneK(Mn74+Mn3+)O16
Mn Lithiophorite(Al,Li)MnO2(OH)2
Mn BrauniteMn2+Mn63+(SiO4)O8
Mn BixbyiteMn23+O3
FeIron
Fe HematiteFe2O3

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Ostwald, J. (1984), Two Varieties of Lithiophorite in Some Australian Deposits, Mineralogical Magazine, Vol 48, pp383-388, September 1984
The Sydney Morning Herald newspaper (1972), Longreach Confident, 30/05/1972
Varentson, I.M. (1996), Manganese Ores of Supergene Zone: Geochemistry of Formation, Ch. Manganese Ores in Weathering Crust, Geological Institute, Russian Acadamy of Sciences, Moscow, P109, 1996
The Canberra Times newspaper (1968), Longreach to Mine Manganese, 03/09/1968
The Canberra Times newspaper (1971), Longreach in Pact on WA Manganese Ore, 07/07/1971
The Australian Institute of Mining and Metallurgy (1977), Investigation of the Ferruginous Manganese Deposits at Ripon Hills. Pilbara Manganese Province. Western Australia, 1977

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