Abstract

The Central Gawler Gold Province is poorly known and poorly explored, principally because of the extensive development of regolith. CRC LEME is collaborating with Geoscience Australia and the Minerals Resources Group in the South Australian Department of Primary Industry and Resources to reduce the risk attached to exploration through the regolith in this terrain. We have integrated the interpretation of geological, geophysical, and calcrete geochemical data at known prospects in order to develop a strategy for generating ranked drilling targets. This ranking strategy carries the assumption that Au anomalies in calcrete formed in in-situ regolith materials are associated with Au mineralisation at depth. However, this assumption ignores the possibility that Au is moving laterally through the regolith in groundwater. It has been established that groundwater is mobilising significant quantities of Au in areas of the central Gawler Craton. Au may be precipitated within the regolith when the chemical or physical conditions governing mobilisation change. This process could generate "false" Au anomalies. Our research suggests that regolith geochemistry (surface and sub-surface) should be interpreted against the groundwater chemistry and an understanding of groundwater flow paths. Whereas groundwater chemistry can only be established by assaying samples from drillholes, groundwater flow paths can be mapped using a combination of geology and geophysics. At prospect scale, these results can be used as vectors to primary mineralisation, thereby refining targeting strategies.
Google map showing geographic bounding box with values North bound -29.0 East bound 138.0 West bound 133.0 South bound -34.0
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please contact the Geoscience Australia Sales Centre via:

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Product Type/Sub Type

dataset - PowerPoint

Constraints

license
Creative Commons Attribution 3.0 Australia Licence

IP Owner

Commonwealth of Australia (Geoscience Australia)

Author(s)

Date (publication)

2004

Product Type

dataset

Topic Category

geoscientificInformation

Keywords

PowerPoint
geochemistry
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-29.0
East bound
138.0
West bound
133.0
South bound
-34.0

Lineage

Unknown

Digital Transfer Options

onLine

DISTRIBUTION Format

pdf

Distributor

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

Metadata File Identifier

a05f7892-db3d-7506-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 Date Stamp

2008-11-17

METADATA SECURITY CLASSIFICATION

unclassified

Metadata Contact

Role
pointOfContact
Organisation Name
Geoscience Australia
City
Canberra
Administrative Area
ACT
Postal Code
2601
Country
Australia
Email Address
Downloads
For information on acquiring this product,
please contact the Geoscience Australia Sales Centre via:

fax:
+61 2 6249 9960; or
phone:
1800 800 173 (within Australia);
 
+61 2 6249 9966 (outside Australia).

Please note that support hours are 9 am to 5 pm weekdays