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Open File Report 115

Preliminary regolith studies at ET, Monsoon, Jumbuck, South Hilga and Golf Bore Gold Prospects, Gawler Craton, South Australia

Lintern, M.J., Sheard, M.J. and Gouthas, G.

The principal objective of this study was to evaluate the use of transported overburden for detecting buried Au deposits in the western Gawler Craton. Five prospects (ET, Monsoon, South Hilga, Golf Bore and Jumbuck) were investigated to determine the most suitable single site for a detailed study.

A single traverse, several hundred metres in length, was selected across each prospect that had mineralisation, transported overburden and adequate drill spoil. The regolith stratigraphy was described at each site and a selection of samples from the drill spoil was collected for multi-element analysis. An existing company geochemical database for each prospect was also used.

The results showed:

  1. the ET Prospect as the most suitable site for further study (see reasons below);
  2. complex but repeating patterns in the nature of the regolith stratigraphy;
  3. the benefits and limitations of using PIMA for exploration;
  4. an apparent relationship between Au-in-calcrete anomalies and mineralisation where the transported overburden was thin (<5 m); and
  5. limited use for pathfinder elements for finding Au mineralisation.

The ET Prospect was selected for further work as it had the following properties:

  1. two hundred drillholes spread over the prospect with cuttings in good condition;
  2. a large Au-in-calcrete anomaly that had not been linked to a primary source, leaving potential for additional areas of investigation and possible drill targets;
  3. indications that mineralisation might be expressed in the transported overburden;
  4. a greater spread and thickness of transported overburden compared with other sites; and
  5. sand dunes, typical of the western Gawler Craton, and a hindrance to exploration in this region; there are few previous studies in this type of terrain.

Last updated: Friday, January 25, 2002 3:56 PM


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