Friday, November 24, 2017
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1. GEOSCIENCE FOR MINING
1.2 Geophysical Mapping Program

The Division carries out appropriate geophysical data acquisition to assist mineral exploration throughout the country. Large airborne geophysical surveys are done by specialised contractors, while the Division does small detailed ground geophysics.

EU - funded Central Highlands & Papuan Peninsula airborne magnetics and radiometrics

The survey area is divide into two parts:

  1. Area A – PNG Central Highlands. This area encompasses an area of 62,000km2, and contains six 1:250k map sheets covering most of the PNG Highlands region.

    Area B – Papuan Peninsula. This survey area occupies 29,400km2, and covers parts of the Morobe, Gulf and Central Provinces. Both areas were flown at a flight line spacing of 400-500m at a norminal terrain clearance of 100m

    Data is available from GIS Informationa and Marketin Branch. Contact: alakamanga@mra.gov.pg


MRA - funded Western PNG Airborne Geophysical Survey

The survey area, adjoins onto the western part of the EU-funded Area A airborne survey, strategically located between the huge Ok-Tedi porphyry copper-gold project and the advanced Frieda River Porphyry copper-gold project.

Comprising a total of 30,745.8 line km and covering an area of 13,724km2, the survey was flown at norminal terrain clearance of 100m and a flight line spacing of 500m.

Data will be available soon.

Central Province Fe and Mn investigations

The application of ground magnetics in mineral exploration was put to test in two different sites in the Central Province. Site 1 is the Kore gossan, approximately 2 hours drive south-east of Port Moresby. Site 2 is the manganese nodules at Kemaea, less than an hours drive south-east of Port Moresby.

Both sites responded differently to the magnetic survey with the Kore gossan not very visible behind tha volcanic background. The Kemaea survey survey as able to show a distinct structural lineation within the area, which is within proximity to known manganese mines. The relationship of the structure to the deposits is not known.

The field investigations are discussed in the Geological Survey technical not Tn 2012/05 Mosusu et al., 2012.