Abstract

Known mineral deposits in the Cobar area of NSW are magnetic. Hence, the magnetic method is an important tool in the search for mineral deposits in this area. Unfortunately, widespread occurrences of near-surface magnetic mineral accumulations commonly produce aeromagnetic anomalies similar to those expected from bedrock sources. Work by BMR during 1978 and 1979 has shown that the near-surface response is caused by laterite, which contains concentrations of hematite/maghemite minerals with high magnetic remanence and/or susceptibility. These magnetic minerals usually occur in surface layers up to 10 m thick and exhibit large lateral and vertical variations in magnetic properties over small distances. Frequency domain analysis of both model and field magnetic data shows the spectral signatures of bedrock and near-surface sources to be distinctly different. Hence, spectral techniques may be used to separate the responses of bedrock and near-surface sources which occur at the same locality, if high resolution data are available. A comparison of the response of near-surface and bedrock sources by modelling indicates that, with careful survey design, a magnetic target such as Elura could be detected at a depth of 300 m, even in areas of severe surface magnetic noise.
Google map showing geographic bounding box with values North bound -31.0 East bound 147.0 West bound 145.5 South bound -32.0
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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)

1981-01-01T00:00:00

Product Type

nonGeographicDataset

Topic Category

geoscientificInformation

GA Catalogue Number

81061 Product http://www.ga.gov.au/metadata-gateway/metadata/record/81061/

Keywords

GA Publication
Journal
NSW
Earth Sciences

Resource Language

English

Resource Character Set

utf8

Resource Security Classification

unclassified

Geographic Extent

North bound
-31.0
East bound
147.0
West bound
145.5
South bound
-32.0

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

Metadata File Identifier

fae9173a-7002-71e4-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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