Abstract

Host rocks to the Coronation Hill U-Au mine have long been regarded as agglomerate occupying a volcanic vent, and, as such, the deposit has been regarded as volcanogenic and radically different from the other U-Au stratabound, unconformity-related deposits of the South Alligator Valley district. The agglomerate is reinterpreted as a polymictic debris-flow conglomerate, consisting of rounded to angular clasts of quartz, quartzite, sandstone, carbonaceous shale, rhyolite, and volcaniclastics in a greywacke matrix. Its development was unrelated to volcanism. The deposit lies on the flank of a basinal conglomerate-sandstone-volcanic succession (Coronation Sandstone of the late Early Proterozoic El Sherana Group) that is unconformable on carbonaceous shale (Early Proterozoic Koolpin Formation). The ore surrounds an intensely faulted wedge-shaped area of conglomerate, altered volcanics, and carbonaceous schist. Uranium mineralisation is classified as epigenetic sandstone type, with uranium-enriched felsic volcanics as the source rock, sandstone beds as conduit rocks, and the carbonaceous schist, either as fault wedges or as clasts in the conglomerate, acting as reductant. In other deposits of the region, precipitation took place within in-situ carbonaceous shale faulted against the conduit sandstone. Intense chlorite alteration in the volcanics is unrelated to uranium mineralisation, but may be related to the gold mineralisation, which in places forms ore shoots that are separate from uranium ore and pass into the altered volcanics.
Google map showing geographic bounding box with values North bound -10.48 East bound 135.3 West bound 129.94 South bound -15.78
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Product Type/Sub Type

nonGeographicDataset

Constraints

Creative Commons Attribution 4.0 International Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

1987-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

81210 Product http://www.ga.gov.au/metadata-gateway/metadata/record/81210/

Keywords

GA Publication
Journal
NT
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-10.48
East bound
135.3
West bound
129.94
South bound
-15.78

Lineage

Unknown

Digital Transfer Options

onLine

Distributor

Role
distributor
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address

Source Description

Source data not available.

Metadata File Identifier

fae9173a-7097-71e4-e044-00144fdd4fa6

Metadata Standard Name

ANZLIC Metadata Profile: An Australian/New Zealand Profile of AS/NZS ISO 19115:2005, Geographic information - Metadata

Metadata Standard Version

1.1

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Commonwealth of Australia (Geoscience Australia)
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
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