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A new look at the geology of the White Pine Cu-Ag deposit and the Midcontinent Rift System


Jones, SM and Cloutier, J and Raub, TD and Prave, AR, A new look at the geology of the White Pine Cu-Ag deposit and the Midcontinent Rift System, Proceedings of the 15th SGA Biennial Meeting: Life with Ore Deposits on Earth, volume 1, 27-30 August 2019, Glasgow, Scotland, pp. 13-16. ISBN 9780852619643 (2019) [Refereed Conference Paper]

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The White Pine Cu-Ag deposit in the Midcontinent Rift System (MRS) is one of the archetype sediment-hosted stratiform copper deposits, with an initial resource of ∼10Mt contained Cu metal. A reinterpretation of reflection seismic data shows the basin lacks many features characteristic of rifts such assyn-sedimentary faults and alluvial fans. Mineralisationis hosted in the ∼1.1 Ga Oronto Group, between braided fluvial sandstone and conglomerate of the Copper Harbor Formation, and siltstones and shales of the Nonesuch Formation deposited in an estuarine setting during a marine transgression. New stable isotope and petrographic data reveal the ingress of seawater into the Copper Harbor Formation aquifer that facilitated the leaching of metals from basaltic detritus during diagenesis. The mineral paragenesis suggests that rapid burial compaction of the aquifer, in tandem with incipient inversion, drove fluid flow. Formation waters reutilised earlier petroleum migration pathways, flowing towards the margins of the sag basin where they were focused by faults on the margins of a paleo-topographic high. Metals were deposited in a zoned sequence during thermochemical sulphate reduction across a redox front of liquid petroleum and in situ organic matter.

Item Details

Item Type:Refereed Conference Paper
Research Division:Earth Sciences
Research Group:Geology
Research Field:Resource geoscience
Objective Division:Mineral Resources (Excl. Energy Resources)
Objective Group:Primary mining and extraction of minerals
Objective Field:Mining and extraction of copper ores
UTAS Author:Cloutier, J (Mr Jonathan Cloutier)
ID Code:142381
Year Published:2019
Deposited By:CODES ARC
Deposited On:2021-01-13
Last Modified:2022-09-07

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