Conference Papers
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The role of alkali bicarbonate-sulfate brines in the genesis of carbonatite REE resources at the Bear Lodge Alkaline Complex, Wyoming The role of alkali bicarbonate-sulfate brines in the genesis of carbonatite REE resources at the Bear Lodge Alkaline Complex, Wyoming
Rare-earth element (REE) resources in the Bear Lodge Alkaline Complex, Wyoming, are hosted in a variably leached carbonatite dike swarm spatially related to bodies of diatreme breccia. This study examines fluid inclusions in carbonatite dikes, peripheral fluorite breccias, and smoky quartz veins to reconstruct the physiochemical conditions of REE mineralization. Results reveal a multi...
Authors
Allen K. Andersen, Danielle A. Olinger, Mitchell M. Bennett
Low-sulfidation epithermal deposits of the central Basin and Range Province, USA Low-sulfidation epithermal deposits of the central Basin and Range Province, USA
The Basin and Range Province is host to many important low-sulfidation epithermal deposits. Within this broad zone of extension, epithermal deposits are hosted by specific areas of Miocene and younger bimodal volcanism. In northern Nevada, rifting and related volcanic activity occurred in response to thermal bulging during the development of the Yellowstone hotspot. The Colorado River...
Authors
Thomas Monecke, Lauren R. Terry, Erik Roger Tharalson, T. James Reynolds, Greg Seitter, Tadsuda Taksavasu, Eric Anderson
Quantitative mineral resource assessment of lithium pegmatite deposits in the Appalachian Orogen, USA Quantitative mineral resource assessment of lithium pegmatite deposits in the Appalachian Orogen, USA
Lithium is classified as a U.S. critical mineral commodity, and its demand is projected to drastically increase through 2040, driven by electric vehicle production and energy storage applications (IEA 2021).Most global lithium production is not in the United States increasing vulnerability to a supply disruption. The U.S. Geological Survey is actively assessing domestic lithium deposits...
Authors
Niki E. Wintzer, Joshua Mark Rosera, Christopher S. Holm-Denoma, Dalton M. McCaffrey, Kelsey Elizabeth Crocker, Joshua Aaron Coyan, Graham W. Lederer
Synergy between geology and geophysics in graphite mineral resource assessment Synergy between geology and geophysics in graphite mineral resource assessment
Graphite is designated as a critical mineral by the U.S. Government due to its essential role in modern technology and its vulnerability to supply chain disruption. To evaluate domestic graphite resources, the U.S. Geological Survey (USGS) conducted two airborne electromagnetic (AEM) surveys as part of the Earth Mapping Resources Initiative (Earth MRI) over prospective areas in the...
Authors
Patricia Grace Macqueen, George N.D. Case, Paul A. Bedrosian, Jane M. Hammarstrom, Susan M. Karl, Graham W. Lederer, Elizabeth M. Bollen, John Whitmore, Dane VanDervoort, Abraham M. Emond, Logan Fusso, Philip J. Brown, Gregory J. Walsh, Keith A. Labay, Martha Stokes, Andrew Arnold Stewart
Mineralization processes at Escanaba Trough Mineralization processes at Escanaba Trough
Escanaba Trough off northern California is the southernmost and only sediment covered segment of the Gorda Ridge. Hydrothermal mineralization was first discovered in Escanaba Trough in 1985, and subsequent investigations included the delineation of the NESCA (northern Escanaba) and SESCA (southern Escanaba) sections of Escanaba Trough, as well as drilling by Ocean Drilling Program (ODP)...
Authors
Amy Gartman, Jaycee Janet Favela, Katlin Bowman Adamczyk, John Jamieson, Rob Zierenberg, Isobel Yeo
Comparing magmatism and hydrothermal alteration using magnetic modelling and stable isotopes at the Clementine porphyry copper prospect, Montana, USA Comparing magmatism and hydrothermal alteration using magnetic modelling and stable isotopes at the Clementine porphyry copper prospect, Montana, USA
Recent mapping of the underexplored Clementine prospect in southwestern Montana has revealed evidence of hydrothermal alteration and mineralized breccia vein gossan interpreted to represent the upper expression of a Cretaceous, sediment-hosted copper porphyry system. The prospect is at the nexus of several Cretaceous granites, including the pre-mineralization Butte Granite and Big Hole...
Authors
Benjamin Patrick Magnin, Julia A. McIntosh, George H. Brimhall