Conference Proceedings
PACRIM 2019
Conference Proceedings
PACRIM 2019
Toward a global Carlin-type exploration model
Nevada hails as the pre-eminent camp for sediment-hosted gold deposits, yet uncertainty in the age and regional processes responsible for its giant gold-only deposits have contributed to less effectual exploration beyond its bounds. We assess recent findings contributing toward a Carlin-type deposit (CTD) exploration model beginning with the age of deposits in Nevada, which was long controversial but now firmly established as Eocene, with deposits forming over <7 m.y. second, ctds are regionally coeval and cospatial with other major eocene gold-dominated deposits, including gold skarn and hornfels-associated distal-disseminated, with all deposits possessing distinctly reduced ore mineralogy. ctds formed at shallow depths and low temperature, and some newly recognized deposits formed at or near the eocene paleosurface. third, all deposits are spatially and temporally linked with a distinct pulse of continental arc magmatism, yet major ctds are concentrated along the west end of the arc (fig. 1), whereas the east end contains numerous porphyry copper-related deposits, including super-giant bingham canyon; production from the center of the arc is notably scarce. production from eocene deposits in the great basin is ~6.2kt au (199 moz), 27.6 kt ag (887 moz), 17.5 mt cu, and 0.5 mt mo, constituting the majority of production of these metals from the region. however, production is strikingly polarized with 79% of eocene au derived from north-central nevada, and 98% of cu and 86% of ag derived from north-central utah. citation: ressel, m w, johnson, c l and hollingsworth, e r, 2019. toward a global carlin-type exploration model, in proceedings pacrim 2019, pp 204208 (the australasian institute of mining and metallurgy: melbourne).>7>
Contributor(s):
M W Ressel, C L Johnson, E R Hollingsworth
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- Published: 2019
- PDF Size: 1.055 Mb.
- Unique ID: P201901059