Version History for U.S. Geological Survey Scientific Investigations Report 2018-5160 

Assessment of Undiscovered Copper Resources of the World, 2015

By Jane M. Hammarstrom, Michael L. Zientek, Heather L. Parks, Connie L. Dicken, and the U.S. Geological Survey Global Copper Mineral Resource Assessment Team 

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First posted online May 10, 2019

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Revised and reposted May 24, 2019, as version 1.1

In chapter B, four maps showing permissive tracts for porphyry copper deposits were modified to remove gray areas representing tracts permissive for undiscovered sediment-hosted stratabound copper deposits. The permissive tracts for sediment-hosted stratabound copper deposits are discussed in chapter C. The four updated maps are figures B8, B9, B12, and B13 on p. 51, 52, 55, and 56, respectively.

Because of the updates, the covers, title page, and back of title page were modified to identify the report as version 1.1.

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Revised and reposted December 3, 2021, as version 1.2

In chapter C, on p. 91, the term "Yukon Territory" was replaced by "Northwest Territories" to correct the location of the Redstone Copperbelt.