Stream sediment datasets and geophysical anomalies: a recipe for porphyry copper systems identification - the Eastern Papuan Peninsula experience

Mosusu, Nathan, Bokuik, Angela, Petterson, Michael, and Holm, Robert (2021) Stream sediment datasets and geophysical anomalies: a recipe for porphyry copper systems identification - the Eastern Papuan Peninsula experience. Geosciences, 11 (7). 299.

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Abstract

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.

Item ID: 68875
Item Type: Article (Research - C1)
ISSN: 2076-3263
Keywords: porphyry systems; airborne geophysics; geochemical sampling; stream sediment samples; magnetic; radiometric
Copyright Information: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
Date Deposited: 02 Aug 2021 22:46
FoR Codes: 37 EARTH SCIENCES > 3703 Geochemistry > 370301 Exploration geochemistry @ 20%
37 EARTH SCIENCES > 3705 Geology > 370508 Resource geoscience @ 50%
37 EARTH SCIENCES > 3706 Geophysics > 370601 Applied geophysics @ 30%
SEO Codes: 25 MINERAL RESOURCES (EXCL. ENERGY RESOURCES) > 2503 Mineral exploration > 250302 Copper ore exploration @ 70%
28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280107 Expanding knowledge in the earth sciences @ 30%
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