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Geophysical Monograph 242


Ore Deposits

Origin, Exploration, and Exploitation

Sophie Decrée

Laurence Robb

Editors





This Work is a co‐publication of the American Geophysical Union and John Wiley and Sons, Inc.




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CONTRIBUTORS

Jean‐Marc Baele
Department of Geology and Applied Geology
University of Mons
Mons, Belgium

Shaun L. L. Barker
School of Science
University of Waikato, Hamilton, New Zealand;
Mineral Deposit Research Unit
University of British Columbia
Vancouver, BC, Canada;
Centre for Ore Deposit and Earth Sciences
University of Tasmania
Hobart, Tasmania

Tamara B. Bayanova
Geological Institute
Kola Science Centre
Russian Academy of Sciences (GI KSC RAS)
Apatity, Russia

Victor V. Chashchin
Geological Institute
Kola Science Centre
Russian Academy of Sciences (GI KSC RAS)
Apatity, Russia

Janine Cole
School of Geosciences
University of the Witwatersrand
Johannesburg, South Africa;
Geophysics and Remote Sensing Unit
Council for Geoscience
Silverton, Pretoria, South Africa

G. R. J. Cooper
School of Geosciences
University of the Witwatersrand
Johannesburg, South Africa

L. Corriveau
Geological Survey of Canada
Natural Resources Canada
Québec, QC, Canada

W. J. Davis
Geological Survey of Canada
Natural Resources Canada
Ottawa, ON, Canada

Sophie Decrée
Geological Survey of Belgium
Royal Belgian Institute of Natural Sciences
Brussels, Belgium

Stijn Dewaele
Department of Geology and Mineralogy
Royal Museum for Central Africa
Tervuren, Belgium;
Department of Geology and Soil Science
Ghent University
Ghent, Belgium

Gregory M. Dipple
Mineral Deposit Research Unit
University of British Columbia
Vancouver, BC, Canada

R. J. Durrheim
University of the Witwatersrand
School of Geosciences
Johannesburg, South Africa

Niels Hulsbosch
KU Leuven
Geodynamics and Geofluids Research Group
Department of Earth and Environmental Sciences
Leuven, Belgium

E. J. Hunt
University of the Witwatersrand
School of Geosciences
Johannesburg, South Africa

Alexey U. Korchagin
Geological Institute, Kola Science Centre
Russian Academy of Sciences (GI KSC RAS), Apatity, Russia;
JSC “Pana,”
Apatity, Russia

John N. Ludden
British Geological Survey
Keyworth, Nottingham, UK

M. S. Manzi
University of the Witwatersrand
School of Geosciences
Johannesburg, South Africa

S. Master
Economic Geology Research Institute
School of Geosciences
University of the Witwatersrand
Johannesburg, South Africa

Ryan Mathur
Department of Geology
Juniata College
Huntingdon, Pennsylvania, USA

Maarten Minnen
KU Leuven
Geodynamics and Geofluids Research Group
Department of Earth and Environmental Sciences
Leuven, Belgium

Alexander F. Mitrofanov
SRK ConsultingToronto, Canada

Felix P. Mitrofanov
Geological Institute
Kola Science Centre
Russian Academy of Sciences (GI KSC RAS)
Apatity, Russia

J.‐F. Montreuil
Formerly Institut National de la Recherche Scientifique
Québec, QC, Canada;
Red Pine Exploration Inc.
Toronto, ON, Canada

Philippe Muchez
KU Leuven
Geodynamics and Geofluids Research Group
Department of Earth and Environmental Sciences
Leuven, Belgium

N. M. Ndhlovu
School of Geosciences
University of the Witwatersrand
Johannesburg, South Africa

Lyudmila I. Nerovich
Geological Institute
Kola Science Centre
Russian Academy of Sciences (GI KSC RAS)Apatity, Russia

E. G. Potter
Geological Survey of Canada
Natural Resources Canada
Ottawa, ON, Canada

Brian Rusk
Department of Geology
Western Washington University
Bellingham, Washington, USA

Stephanie E. Scheiber‐Enslin
School of Geosciences
University of the Witwatersrand
Johannesburg, South Africa

Pavel A. Serov
Geological Institute
Kola Science CentreRussian Academy of Sciences (GI KSC RAS)
Apatity, Russia

Da Wang
State Key Laboratory of Geological Processes and Mineral Resources
School of Earth Sciences and Resources
China University of Geosciences Beijing, China

Susan J. Webb
School of Geosciences
University of the Witwatersrand
Johannesburg, South Africa

Dmitry V. Zhirov
Geological Institute
Kola Science Centre
Russian Academy of Sciences (GI KSC RAS)
Apatity, Russia

PREFACE

The volatility of financial markets over the past decade has had a major impact on the upstream sector of the global resource industry. Exploration and replenishment of natural resources have not kept pace with consumption, and the declining rate of discovery of new, viable mineral deposits is cause for concern. Coupled with this is the fact that world‐class mineral deposits are increasingly difficult to find because large, shallow ores have largely been discovered. A major challenge of the 21st century, therefore, is how to locate buried mineral deposits that do not have a footprint at the surface, and also how to identify new sources of mineral wealth.

Recent trends in exploration and mining have seen a number of amazing innovations, exemplified by technologies that have, for example, enabled the mining of massive sulphide deposits on the ocean floor. Even more astounding are the developments aimed at exploiting asteroids from near‐Earth orbits. While many might see these innovations as futuristic, they are nevertheless counterbalanced by the ability of geoscientists to continue pushing the frontiers of mineral exploration and seek new land‐bound metallotects, as well as to develop innovative methods for detecting metal anomalies under cover. This book brings together a variety of papers that, in Section I, highlight the features of less conventional mineral deposit styles that offer alternative exploration opportunities, and, in Section II, describe some of the recent technological advances that will assist in the future discovery of mineral deposits.

Whereas most of the world's mineral exploration is still focused on well‐trodden metallotects, such as magmatic arcs and stable cratonic blocks, Section I emphasizes the features of atypical ores such as metamorphosed porphyry deposits of Proterozoic age, stratiform copper deposits hosted in sandstone, and fractionation mechanisms in S‐type granitoids. These examples point to the fact that exploration should not be constrained by geologic didactics that exclude certain targets because of seemingly inappropriate lithology, tectonic setting, or epoch. Some of the great discoveries of the past have been made by thinking intuitively and “out of the box.” Section II presents a variety of techniques that expand the armory of exploration tools available to the geoscientist: from microscopic and laboratory techniques involving mineral cathodoluminescence and isotope vectoring, to big data approaches aimed at geophysically imaging the Earth's crust. Although this book covers but a small fraction of the advances currently being made in mineral exploration science, it is timely because these innovations will catalyze the implementation of resource utilization policies that will, in the future, be more sustainable and environmentally responsive than at any time in the past.

Sophie Decrée
Royal Belgium Institute of Natural Sciences
and
Geological Survey of Belgium

Laurence Robb
University of Oxford
and
CIMERA – University of the Witwatersrand/University of Johannesburg

Section I
Characteristics of Atypical Mineral Deposit Styles