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Geological inspection of prospecting work carried out under exclusive prospecting licence one (Papua) on Misima Island, February, 1961

Created 16/10/2025

Updated 16/10/2025

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The prospecting work carried out by Pacific Island Mines Limited under Exclusive Prospecting Licence One (Papua) on Misima Island was inspected in February, 1961. The company is carrying out a programme of long shallow costeaning supplemented by shorter deeper costeaning to discover and open MD gold bearing quartz-manganese lodes in these areas. An adit has been driven on one of the lodes found by the deeper costeaning and a plant capable of treating fifty tons a day has been installed. Most of the lode material opened up by the work done by the company occurs as lenses in a flat-lying shear zone in porphyry. The porphyry is intermediate and intrudes schist. The shear zone has been opened up over a width of eighty feet at right angles to the schist contact. A smaller lode (the one opened up by the adit) occurs in a sheared porphyry dyke intruded along the contact between two of the rock units recognised by de Keyser (1960) in the schists, namely the Ara Greenschist and the Umuna Schist. Other small lodes occur in the schist. The grade of the lode determined by panning and visual estimation, appears to be four to six pennyweights of gold per ton. The lode-bearing shear zone has been opened up over an outcrop distance of more than 2500 feet. Other lodes are known outside the present area of detailed costeaning, but none of these has been opened up. Further work is needed in the area of detailed coslteaning to obtain an accurate grade of the lode material; to discover the dimensions of the lenses already found; to prove down-dip and along-strike extensions of the lode-bearing shear zone, and to determine its thickness. Work is also needed to investigate the lodes known to exist outside the areas of detailed costeaning and to prospect the rest of the Exclusive Prospecting Licence Area.

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Field Value
Title Geological inspection of prospecting work carried out under exclusive prospecting licence one (Papua) on Misima Island, February, 1961
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/a45a4f24-8af3-4098-8157-da5ebfa24e0a
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage Australia
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Geological inspection of prospecting work carried out under exclusive prospecting licence one (Papua) on Misima Island, February, 1961". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/geological-inspection-of-prospecting-work-carried-out-under-exclusive-prospecting-licence-1961