Karl J. Ellefsen
U.S. Geological Survey, Denver, CO
Activity
2023
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CRITICAL CONSIDERATIONS WHEN USING COMPILED GEOCHEMICAL DATASETS
T95 Linking Critical Minerals and the Geologic Framework of North America: The USGS Earth Mapping Resources Initiative (Earth MRI) and Related Activities (Posters)Monday, 16 October 20238:00 AM - 5:30 PMHall B
2019
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INITIAL EVALUATION OF STREAM-SEDIMENT GEOCHEMICAL DATA FROM THE TAYLOR MOUNTAINS QUADRANGLE, ALASKA
261 D6. Recent Advances in Geochemistry (Posters)Wednesday, 25 September 20199:00 AM - 6:30 PMHall AB, North Building
2015
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GEOPHYSICAL AND GEOCHEMICAL APPROACHES TO EVALUATING PLACER RARE-EARTH ELEMENT RESOURCES IN THE SOUTHEASTERN U.S. COASTAL PLAIN
322 Economic GeologyWednesday, 4 November 20151:30 PM - 5:30 PMRoom 331/332
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ELEMENTAL DISTRIBUTION IN THE ALASKAN LANDSCAPE
3 Metalloids and Other Geogenic Contaminants in the EnvironmentMonday, 11 May 20158:00 AM - 12:00 PMRoom 116
2014
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GEOPHYSICAL IMAGING OF REE-BEARING MINERALS HOSTED IN SOUTHEASTERN U.S. PLACER DEPOSITS
40 Economic Geology in the Southeast: Gold, REE, V, U, other Critical Minerals, and the Indispensible Industrial MineralsFriday, 11 April 20141:00 PM - 5:00 PMSolitude
2013
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MIXTURE-MODEL CLUSTERING OF REGIONAL GEOCHEMICAL DATA
T391 Geochemical Mapping at Regional to Continental ScalesWednesday, 30 October 20131:00 PM - 5:00 PMRoom 601
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GEOPHYSICAL APPROACHES TO EVALUATING SEDIMENT-HOSTED RARE EARTH ELEMENT POTENTIAL IN THE SOUTHEASTERN U.S
T109 Geophysical/Remote Sensing Characterization of Rare Earth Element and Other Critical Mineral DepositsMonday, 28 October 20138:00 AM - 12:00 PMRoom 303
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EARTH SCIENCE INPUT FOR EVALUATING SPATIALLY-DISTRIBUTED MESOTHELIOMA RISK FACTORS ASSOCIATED WITH ENVIRONMENTAL EXPOSURES TO ERIONITE AND OTHER ELONGATE MINERAL PARTICLES
57 Environmental Exposure to Asbestos and Other Natural FibersThursday, 29 August 20132:10 PM - 4:30 PMWashington II
2010
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A BRIEF INTRODUCTION TO INVERSE MODELING
19 Inverse Modeling and Related Analyses: Methods and ApplicationsThursday, 10 June 20108:00 AM - 12:00 PMPine
2009
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CHARACTERIZATION OF THE POTENTIAL FOR OXIDATION AND MOBILIZATION OF GEOGENIC AND FERTILIZER-DERIVED CHROMIUM IN SOILS OF THE SACRAMENTO VALLEY, CALIFORNIA
T70 Sources, Transport, and Fate of Trace and Toxic Elements in the Environment IISunday, 18 October 20091:30 PM - 5:30 PMPortland Ballroom 253
2006
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SEISMIC INVESTIGATION OF FAULTED, SEDIMENTARY BEDROCK AT THE FORMER NAVAL AIR WARFARE CENTER, WEST TRENTON, NEW JERSEY
T6 Fractured Rock Characterization in Applied GeologySunday, 22 October 20068:00 AM - 12:00 PM