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Geophysical test survey over dykes in the Newcastle Coalfields, New South Wales

Created 17/10/2025

Updated 17/10/2025

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Results are given of a geophysical test survey made at three localities on the Newcastle coalfield in August, 1952, to determine whether intrusive doleritic dykes could be located by the magnetic method. Knowledge of the position of the dykes would assist in planning the lay-out of underground workings and of surface roads. The results showed only slight variations of the magnetic field, but some weak anomalies of less than 100 gammas were recorded. The position of these anomalies coincides with the inferred position of the basic dykes near the surface. The variation in the shape of anomalies suggests non-uniformity of the magnetic properties and shape of the dykes. The magnetic method might be helpful in determining the position and extent of the dykes beyond the areas where they are known, but supporting evidence from other geophysical methods such as the gravity of electric resistivity methods may be needed to verify the magnetic results.

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Field Value
Title Geophysical test survey over dykes in the Newcastle Coalfields, New South Wales
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/en/dataset/84aad27c-a2ce-445b-8d83-e3426ccbfd84
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        151.5,
        -33.2
      ],
      [
        151.9,
        -33.2
      ],
      [
        151.9,
        -32.8
      ],
      [
        151.5,
        -32.8
      ],
      [
        151.5,
        -33.2
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Geophysical test survey over dykes in the Newcastle Coalfields, New South Wales". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/geophysical-test-survey-over-dykes-in-the-newcastle-coalfields-new-south-wales