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Article

Stream Sediment Datasets and Geophysical Anomalies: A Recipe for Porphyry Copper Systems Identification—The Eastern Papuan Peninsula Experience

1
Geological Survey Division, Mineral Resources Authority, National Capital District 0121, Port Moresby P.O. Box 1906, Papua New Guinea
2
School of Science, Auckland University of Technology, Auckland 1010, New Zealand
3
CSA Global, 3 Ord Street, West Perth, WA 6005, Australia
4
Economic Geology Research Centre, James Cook University, Townsville, QLD 4811, Australia
*
Author to whom correspondence should be addressed.
Academic Editors: Michael D. Campbell and Jesus Martinez-Frias
Geosciences 2021, 11(7), 299; https://doi.org/10.3390/geosciences11070299
Received: 18 May 2021 / Revised: 30 June 2021 / Accepted: 6 July 2021 / Published: 20 July 2021
(This article belongs to the Special Issue The Geoscience of the Pacific Islands Region: Theory and Practice)
Airborne magnetic and radiometric datasets have, over the past few years, become powerful tools in the identification of porphyry systems which may host economic porphyry copper–gold–molybdenum ore bodies. Magnetisation contrasts with the unaltered host rocks, coupled with the elevated radiometric signature, compared to the host rock, makes identification of large-scale porphyry copper systems possible. Integrating these two different datasets with stream sediment data and other geochemical exploration methods results in a higher degree of confidence. Stream sediment data were analysed to see the distribution of copper and gold elements throughout the study area, located within the Eastern Papuan Peninsula of Papua New Guinea. Airborne geophysics data over the same area were also processed for magnetic and radiometric responses. The processing of the magnetic data revealed several magnetic anomalies related to concealed intrusive rock units, with associated radiometric signatures. The distribution of gold and copper anomalism was correlated with the geology and geophysical signatures. Results indicate varying degrees of correlation, with some areas showing a strong correlation between gold/copper occurrence and geophysical signatures, compared to other areas. Some factors that we believe impact the level of correlation may include tectonic history, volcanic cover, and weathering patterns. We recommend caution when applying multi-data exploration for porphyry copper systems. View Full-Text
Keywords: porphyry systems; airborne geophysics; geochemical sampling; stream sediment samples; magnetic; radiometric porphyry systems; airborne geophysics; geochemical sampling; stream sediment samples; magnetic; radiometric
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MDPI and ACS Style

Mosusu, N.; Bokuik, A.; Petterson, M.; Holm, R. Stream Sediment Datasets and Geophysical Anomalies: A Recipe for Porphyry Copper Systems Identification—The Eastern Papuan Peninsula Experience. Geosciences 2021, 11, 299. https://doi.org/10.3390/geosciences11070299

AMA Style

Mosusu N, Bokuik A, Petterson M, Holm R. Stream Sediment Datasets and Geophysical Anomalies: A Recipe for Porphyry Copper Systems Identification—The Eastern Papuan Peninsula Experience. Geosciences. 2021; 11(7):299. https://doi.org/10.3390/geosciences11070299

Chicago/Turabian Style

Mosusu, Nathan, Angela Bokuik, Michael Petterson, and Robert Holm. 2021. "Stream Sediment Datasets and Geophysical Anomalies: A Recipe for Porphyry Copper Systems Identification—The Eastern Papuan Peninsula Experience" Geosciences 11, no. 7: 299. https://doi.org/10.3390/geosciences11070299

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