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Abra deposit, Mulgul Station, Meekatharra Shire, Western Australia, Australiai
| Regional Level Types | |
|---|---|
| Abra deposit | Deposit |
| Mulgul Station | - not defined - |
| Meekatharra Shire | Shire |
| Western Australia | State |
| Australia | Country |
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Latitude & Longitude (WGS84):
24° 38' 44'' South , 118° 34' 59'' East
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Located 170 km south-west of Newman. Stratabound polymetallic (Pb-Ag-Cu-Au) sedimentary deposit.
Identified from numerous exploration drillholes. The area was first explored from 1976 by Amoco, then the 1990s by Renison Goldfields Consolidated Limited, Oldcity Nominees Pty Ltd from 2000, and from 2005 by Abra Mining Limited. The Abra deposit was discovered in 1981. Base metal mineralization shows lead, silver, copper and gold. The Genie prospect is 3.5 kilometres east of Abra, Hyperion prospect 2 kilometres west of Abra, Bazaar prospect south of Abra, Rhea prospect north-east, and Tethy's south of Genie. All the mineralization is covered by barren sediment.
The deposits are located in the middle Proterozoic aged Jillawarra Sub-Basin, 65 kilometres long by 10 kilometres wide, the centre dominated by the Coolina Anticline. Abra is found on the southern limb of the anticline. The host stratigraphy is the Jillawarra Formation of siltstone with minor sandstone, Kiangi Creek Formation of siltstone, and the Irregully Formation of siltstone and dolomite. Base metal mineralization occurs in the upper part of the Irregully Formation.
Mineralization at Abra is disseminated and veins hosting galena, chalcopyrite and sphalerite, up to 300 metres thick, 1000 metres east-west, and 800 metres north-south. It is in a core of an intense alteration system comprising upper stratabound alteration mineralization, overlying a complex hydrothermal breccia stockwork.
In the Stratabound Domain at the top there is an upper red banded zone of red banded hematite with subordinate magnetite-barite-carbonate-silica-pyrite-galena. Then a lower black banded zone of banded grey hematite/magnetite-silica-carbonate-chlorite-barite-galena-chalcopyrite-pyrite. In the Stockwork Domain there is pervasive chlorite/siderite alteration of laminated sediments, overprinted by intense hydrothermal breccia, grading to upright laminated veins and zones of quartz-hematite-chalcopyrite-gold-pyrite-magnetite-dolomite.
The deposit occurs in banded massive and brecciated silica-barite-hematite-magnetite-dolomite sequence, underlying chlorite altered hydrothermal breccia. The top of the deposit is 250 metres below the surface. The mineral sequence starts from the top of a Red Banded Zone of silica-barite-jaspillite-hematite-magnetite-dolomite; Dolomite Banded Zone of dolomite-silica-magnetite; Black Banded Zone of silica-magnetite-hematite-dolomite; a Chlorite Alteration-Breccia Stringer Zone; and Footwall Laminated Sediments.
Identified from numerous exploration drillholes. The area was first explored from 1976 by Amoco, then the 1990s by Renison Goldfields Consolidated Limited, Oldcity Nominees Pty Ltd from 2000, and from 2005 by Abra Mining Limited. The Abra deposit was discovered in 1981. Base metal mineralization shows lead, silver, copper and gold. The Genie prospect is 3.5 kilometres east of Abra, Hyperion prospect 2 kilometres west of Abra, Bazaar prospect south of Abra, Rhea prospect north-east, and Tethy's south of Genie. All the mineralization is covered by barren sediment.
The deposits are located in the middle Proterozoic aged Jillawarra Sub-Basin, 65 kilometres long by 10 kilometres wide, the centre dominated by the Coolina Anticline. Abra is found on the southern limb of the anticline. The host stratigraphy is the Jillawarra Formation of siltstone with minor sandstone, Kiangi Creek Formation of siltstone, and the Irregully Formation of siltstone and dolomite. Base metal mineralization occurs in the upper part of the Irregully Formation.
Mineralization at Abra is disseminated and veins hosting galena, chalcopyrite and sphalerite, up to 300 metres thick, 1000 metres east-west, and 800 metres north-south. It is in a core of an intense alteration system comprising upper stratabound alteration mineralization, overlying a complex hydrothermal breccia stockwork.
In the Stratabound Domain at the top there is an upper red banded zone of red banded hematite with subordinate magnetite-barite-carbonate-silica-pyrite-galena. Then a lower black banded zone of banded grey hematite/magnetite-silica-carbonate-chlorite-barite-galena-chalcopyrite-pyrite. In the Stockwork Domain there is pervasive chlorite/siderite alteration of laminated sediments, overprinted by intense hydrothermal breccia, grading to upright laminated veins and zones of quartz-hematite-chalcopyrite-gold-pyrite-magnetite-dolomite.
The deposit occurs in banded massive and brecciated silica-barite-hematite-magnetite-dolomite sequence, underlying chlorite altered hydrothermal breccia. The top of the deposit is 250 metres below the surface. The mineral sequence starts from the top of a Red Banded Zone of silica-barite-jaspillite-hematite-magnetite-dolomite; Dolomite Banded Zone of dolomite-silica-magnetite; Black Banded Zone of silica-magnetite-hematite-dolomite; a Chlorite Alteration-Breccia Stringer Zone; and Footwall Laminated Sediments.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
14 valid minerals.
Rock Types Recorded
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Bournonite | 2.GA.50 | PbCuSbS3 |
| ⓘ | 'Tetrahedrite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)Sb4S12S |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| ⓘ | Hematite | 4.CB.05 | Fe2O3 |
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Siderite | 5.AB.05 | FeCO3 |
| ⓘ | Dolomite | 5.AB.10 | CaMg(CO3)2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte | 7.AD.35 | BaSO4 |
| ⓘ | Scheelite | 7.GA.05 | Ca(WO4) |
| Group 9 - Silicates | |||
| ⓘ | Microcline var. Hyalophane | 9.FA.30 | (K,Ba)[Al(Si,Al)Si2O8] |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| Unclassified | |||
| ⓘ | 'Chlorite Group' | - | |
List of minerals for each chemical element
Other Regions, Features and Areas containing this locality
Australia
- Western Australia
- Edmund BasinBasin
- Gascoyne ProvinceGeologic Province
- Warakurna Large Igneous ProvinceGeologic Province
- West Australian ElementCraton
Australian PlateTectonic Plate
- West Australian Craton
- Capricorn OrogenOrogenic Belt
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References
Vogt, J. H.; Stumpfl, E. F. (1987) Abra: a strata-bound Pb-Cu-Ba mineralization in the Bangemall Basin, Western Australia. Economic Geology, 82 (4). p.805-825. doi:10.2113/gsecongeo.82.4.805
Mutton, A. J., Mclnerney, P. M. (1987) The geophysical discovery of the Abra base metal deposit, Bangemall Basin, Western Australia. Exploration Geophysics, 18 (1) 148-151 doi:10.1071/eg987148
Mclnerney, Philip M., Mutton, Andrew J., Peters, William S. (1994) Abra Lead-Silver-Copper-Gold Deposit, Western Australia: A Geophysical Case History. Exploration Geophysics, 25 (3) 164 doi:10.1071/eg994164
Ferguson, K. M. (1999) Lead, zinc and silver deposits of Western Australia. Mineral Resources Bulletin 15. Geological Survey of Western Australia
