A.H Hofstra
Geology, Geophysics, and Geochemistry Science Center, Denver, CO
Activity
2024
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STABLE ISOTOPE COMPOSITIONS OF MINERALS AT HICKS DOME, IL-KY FLUORSPAR DISTRICT, USA: IMPLICATIONS FOR REE+Y-HFSE-FLUORSPAR DEPOSIT GENESIS
T126 Ore Genesis in Extensional Tectonic EnvironmentsMonday, 23 September 20241:30 PM - 5:30 PM207C
2023
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40AR/39AR GEOCHRONOLOGY OF HYDROTHERMAL MINERALS FROM IOA AND IOCG DEPOSITS IN THE SOUTHEAST MISSOURI IRON PROVINCE, USA – RELATION TO 1.4 AND 1.3 GA MAGMATISM
T188 Linking Critical Minerals and the Geologic Framework of North America II: The USGS Earth Mapping Resources Initiative (Earth MRI) and Related ActivitiesTuesday, 17 October 20231:30 PM - 5:30 PM324
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ALTERATION GEOCHEMISTRY OF THE BOURBON IRON OXIDE-APATITE AND BOSS IRON OXIDE-COPPER-GOLD DEPOSITS, SOUTHEAST MISSOURI, USA
T150 Geologic Fluids: Agents of ChangeTuesday, 17 October 20238:00 AM - 12:00 PM330
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STABLE ISOTOPE COMPOSITIONS OF CARBONATES IN THE HICKS DOME CRITICAL MINERAL RESOURCE, IL-KY FLUORSPAR DISTRICT, USA: IMPLICATIONS FOR GENETIC MODELS
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
2022
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GEOCHEMICAL SIGNATURES OF SULFIDES FROM IOA-IOCG DEPOSITS IN SE MISSOURI, USA: RELATION TO MAFIC TO INTERMEDIATE INTRUSIONS, FELSIC INTRUSIONS, AND CALDERA LAKES
265 D3. Recent Advances in Economic Geology (Posters)Wednesday, 12 October 20222:00 PM - 6:00 PMExhibit Hall F
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THE ABUNDANCE AND DISTRIBUTION OF CRITICAL MINERALS IN VARIOUS MINERAL DEPOSITS OF CLIMAX-TYPE MAGMATIC-HYDROTHERMAL SYSTEMS OF THE UNITED STATES
212 D1. Recent Advances in Economic GeologyWednesday, 12 October 20228:00 AM - 12:00 PMMile High Ballroom 4C
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MINERALOGY ACROSS SCALES – MAPPING THE SUBSURFACE FOR ADVANCED MINERAL EXPLORATION AND ASSESSMENT
T187 Mathematics, Statistics, and Machine Learning in the Geosciences. How Can We Solve Today’s Challenges through Data Mining and Artificial Intelligence?Tuesday, 11 October 20221:30 PM - 5:30 PM502
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MAJOR AND MINOR ELEMENT VARIATIONS IN CORE FROM THE IRON CREEK DEPOSIT IN THE IDAHO COBALT BELT: RAPID CONTINUOUS XRF DATA ACQUISITION FOR CRITICAL MINERAL EXPLORATION AND ASSESSMENT
T41 Critical Minerals and Framework Geology: The USGS Earth Mapping Resources Initiative (Earth MRI) and Related Activities IISunday, 9 October 20221:30 PM - 5:30 PM601
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INSIGHTS ON IRON OXIDE-APATITE AND IRON OXIDE-COPPER-GOLD DEPOSITS FROM O AND H ISOTOPES IN ACTINOLITE
T5 Metals in Hydrothermal Systems: From Source to SinkSunday, 9 October 20228:00 AM - 12:00 PMMile High Ballroom 4C
2021
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CHEMISTRY OF MINERALS IN IOA DEPOSITS IN SE MISSOURI, USA: RELATION TO MAFIC AND INTERMEDIATE INTRUSIONS
T169 Magnetite Apatite (MtAp) Deposits in Space and TimeTuesday, 12 October 20211:30 PM - 5:30 PMA107–A109
2020
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GEOCHEMISTRY OF APATITE FROM IOA AND IOCG DEPOSITS IN SE MISSOURI, USA: DISTINGUISHING FLUIDS SOURCED FROM MAFIC TO INTERMEDIATE INTRUSIONS, FELSIC INTRUSIONS, AND CALDERA LAKES
T257 Rare Earth Elements: The Behavior of Critical Minerals in Sedimentary, Magmatic, and Magmatic-Hydrothermal SystemsFriday, 30 October 202010:00 AM - 2:00 PMMeeting Rooms
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LITHOGEOCHEMISTRY OF THE HICKS DOME CRITICAL MINERAL RESOURCE, ILLINOIS-KENTUCKY FLUORSPAR DISTRICT, USA: IMPLICATIONS FOR GENESIS
T257 Rare Earth Elements: The Behavior of Critical Minerals in Sedimentary, Magmatic, and Magmatic-Hydrothermal SystemsFriday, 30 October 202010:00 AM - 2:00 PMMeeting Rooms
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P-T-X OF FLUID INCLUSIONS ASSOCIATED WITH HYDROTHERMAL EVENTS IN THE STIBNITE-YELLOW PINE DISTRICT, IDAHO, USA
T216 Advances in Mineral Chemistry for Petrogenesis and Exploration of Mineral DepositsThursday, 29 October 20201:30 PM - 5:30 PMMeeting Rooms
2016
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COMPARISON OF QUARTZ CATHODOLUMINESCENCE (CL) AND FLUID INCLUSION (FI) DATA FROM THE PEA RIDGE AND SHEPHERD MOUNTAIN IRON DEPOSITS IN THE ST. FRANCOIS MOUNTAINS, SE MISSOURI
T319 Mineral Resources for Society: Honoring the Career and Contributions to Economic Geology of Jean S. Cline (Posters)Wednesday, 28 September 20169:00 AM - 6:30 PMExhibit Hall E/F
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FLUID INCLUSIONS IN QUARTZ AND STIBNITE FROM THE YELLOW PINE DEPOSIT OF IDAHO
T319 Mineral Resources for Society: Honoring the Career and Contributions to Economic Geology of Jean S. Cline (Posters)Wednesday, 28 September 20169:00 AM - 6:30 PMExhibit Hall E/F
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CARLIN-LIKE GOLD IN THE IDAHO BATHOLITH – EVIDENCE FROM THE YELLOW PINE DEPOSIT
T212 Mineral Resources for Society: Honoring the Career and Contributions to Economic Geology of Jean S. ClineTuesday, 27 September 20161:30 PM - 5:30 PMRoom 301
2013
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MICROTHERMOMETRIC AND ION RATIO ANALYSES OF FLUID INCLUSIONS FROM THE PEA RIDGE IRON OXIDE-APATITE (IOA) AND BOSS-BIXBY IRON OXIDE-COPPER-GOLD (IOCG) DEPOSITS SUPPORT A MAGMATIC-HYDROTHERMAL ORIGIN
T207 Evolution of REE-Enriched Carbonatite-Alkalic Rock Systems: In Honor of Daniel R. ShaweTuesday, 29 October 20138:00 AM - 12:00 PMRoom 304
2011
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REACTION PATH MODELING OF THE BEOWAWE GEOTHERMAL FIELD, NEVADA: IMPLICATIONS FOR THE FORMATION OF EPITHERMAL AU-AG MINERALIZATION
T158 Advancements in Sub-Seafloor Hydrogeology and Variable-Density SystemsTuesday, 11 October 20118:00 AM - 12:00 PMRoom M100FG
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AR/AR GEOCHRONOLOGY OF MAGMATIC-STEAM ALUNITE FROM ALUNITE RIDGE, MARYSVALE VOLCANIC FIELD, UTAH: TIMING OF MAGMATIC FLUID DISCHARGE AND AGE OF CONCEALED INTRUSIONS
T212 Tectonics and MetallogenyTuesday, 11 October 20111:30 PM - 5:30 PMRoom 101H-J
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AEROMAGNETIC DATA PROVIDE MAP-VIEW CONSTRAINTS ON SEDIMENT PROVENANCE: APPLICATION TO COOK INLET AND CIRCLE, ALASKA
T77 Provenance Analysis in Modern and Ancient Sedimentary SystemsMonday, 10 October 20118:00 AM - 12:00 PMRoom 211CD
2010
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RECOGNITION OF A REGIONAL ORDOVICIAN VALMY FORMATION THRUST SHEET: IMPLICATIONS FOR ASSEMBLY OF THE ROBERTS MOUNTAINS ALLOCHTHON AND EXPLORATION FOR CONCEALED CARLIN-TYPE GOLD DEPOSITS
T243 New Insights on the Tectonic, Magmatic, Paleobiogeographic, and Metallogenic Evolution of Terranes in the North American Cordillera from Alaska to California IWednesday, 3 November 20108:00 AM - 12:00 PMRoom 406
2009
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LOW SALINITY FLUIDS FROM LARGE OPEN SYSTEM MAGMA CHAMBERS FORM PORPHYRY-CU (MO-AU) DEPOSITS
T204 Magmas and Volatiles: Linking Granites, Volcanoes, Geothermal Systems, and Mineral Deposits IITuesday, 20 October 20091:30 PM - 5:30 PME143/144
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CHEMICAL COMPOSITIONS OF MAGMATIC STEAM ALUNITE VEINS FROM DIVERSE PORPHYRY-EPITHERMAL SYSTEMS–IMPLICATIONS FOR MAGMATIC VOLATILE CONTENTS AND DEGASSING PROCESSES
T204 Magmas and Volatiles: Linking Granites, Volcanoes, Geothermal Systems, and Mineral Deposits IITuesday, 20 October 20091:30 PM - 5:30 PME143/144
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OVERVIEW OF THE USGS DENVER INCLUSION ANALYSIS LABORATORY [DIAL] AND APPLICATIONS TO MINERAL RESOURCE INVESTIGATIONS
T93 Melt and Fluid Inclusion Analysis in Resource InvestigationsMonday, 19 October 20098:00 AM - 12:00 PMD135/136
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ANALYSIS OF GASES IN SINGLE MELT OR FLUID INCLUSIONS BY QUADRUPOLE MASS SPECTROMETRY [QMS] AND ION TRAP - TIME OF FLIGHT - MASS SPECTROMETRY [It-TOF-MS] – APPLICATION TO MINERAL RESOURCE INVESTIGATIONS
T120 Melt and Fluid Inclusion Analysis in Resource Investigations (Posters)Monday, 19 October 20099:00 AM - 6:00 PMHall A
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AGE OF SANIDINE AND COMPOSITION OF MELT INCLUSIONS IN QUARTZ PHENOCRYSTS FROM VOLCANIC ROCKS ASSOCIATED WITH LARGE MO AND BE DEPOSITS IN THE WESTERN UNITED STATES
T93 Melt and Fluid Inclusion Analysis in Resource InvestigationsMonday, 19 October 20098:00 AM - 12:00 PMD135/136
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STRATIGRAPHY AND ANTLER AGE DEFORMATION OF THE ROBERTS MOUNTAINS ALLOCHTHON AND THRUST ZONE AND THE RELATIONSHIP TO CARLIN-TYPE GOLD DEPOSITS IN THE INDEPENDENCE MOUNTAINS OF NORTHERN NEVADA
T105 Neoproterozoic through Cretaceous Evolution of the North American Cordilleran Margin: Contrasting Tectonics, Paleogeography, and Paleoenvironments (Posters)Monday, 19 October 20099:00 AM - 6:00 PMHall A
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TECHNIQUES FOR ELEMENTAL QUANTIFICATION OF LASER ABLATION INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY (LA-ICP-MS). RESULTS FOR MELT AND FLUID INCLUSIONS - PROBLEMS AND SOLUTIONS
T93 Melt and Fluid Inclusion Analysis in Resource InvestigationsMonday, 19 October 20098:00 AM - 12:00 PMD135/136
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RE-OS ISOTOPE RESULTS FOR ELECTRUM FROM THREE LOW SULFIDATION EPITHERMAL AU-AG DEPOSITS IN THE GREAT BASIN
11 General Discipline PostersTuesday, 12 May 20098:00 AM - 5:00 PM
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MAPPING ARGILLIC AND ADVANCED ARGILLIC ALTERATION IN VOLCANIC ROCKS, QUARTZITES, AND QUARTZ ARENITES IN THE WESTERN RICHFIELD 1° X 2° QUADRANGLE, SOUTHWESTERN UTAH, USING ASTER SATELLITE DATA
11 General Discipline PostersTuesday, 12 May 20098:00 AM - 5:00 PM
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THE AGE OF ZIRCONS AND COMPOSITION OF MELT INCLUSIONS IN QUARTZ PHENOCRYSTS FROM AN ALTERED DIKE INDICATE THE ~14 MA ALUNITE RIDGE - DEER TRAIL SYSTEM OVERLIES A 30.7 MA SILICIC INTRUSION
11 General Discipline PostersTuesday, 12 May 20098:00 AM - 5:00 PM
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PINE GROVE MO PORPHYRY AND NG ALUNITE AREA, UTAH – DEEP AND SHALLOW PRODUCTS OF NEIGHBORING SILICIC CUPOLAS ABOVE A LARGE PLUTONIC COMPLEX
3 Economic Geology of the Rocky Mountain RegionMonday, 11 May 20098:00 AM - 12:00 PM
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REMOTE DETECTION OF ARGILLIC ALTERATION IN QUARTZITES AND QUARTZ ARENITES ABOVE AND DISTAL TO PORPHYRY CU AND MO DEPOSITS: IMPLICATIONS FOR ASSESSMENTS OF CONCEALED DEPOSITS
3 Economic Geology of the Rocky Mountain RegionMonday, 11 May 20098:00 AM - 12:00 PM
2008
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Effects of Fault Zone Permeability on Fault Controlled Fluid Circulation in Active and Fossil Hydrothermal Systems in the Great Basin
T138 Fault Seals or Conduits? Insights from Hydrologic and Petroleum SystemsSunday, 5 October 20088:00 AM - 12:00 PM
2007
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ORIGIN AND COMPOSITIONS OF FLUIDS THAT FORM PORPHYRY CU (MO-AU) DEPOSITS
T226 Diversity in Crustal Fluid Compositions: Geological Origins and ConsequencesWednesday, 31 October 20071:30 PM - 5:30 PM
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BRINE MIGRATION AND FORMATION OF HYDROTHERMAL ZEBRA DOLOMITE, SEDEX, AND PB-ZN DEPOSITS ALONG THE PALEOZOIC CARBONATE PLATFORM OF THE GREAT BASIN, NEVADA AND UTAH
T200 Geologic Structures, Fluid Flow, and Ore DepositsWednesday, 31 October 20078:00 AM - 12:00 PM
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FAULT CONTROLLED FLUID CIRCULATION IN ACTIVE HOT SPRING AND EOCENE CARLIN-TYPE SYSTEMS IN THE GREAT BASIN
T200 Geologic Structures, Fluid Flow, and Ore DepositsWednesday, 31 October 20078:00 AM - 12:00 PM
2006
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A NEW PARALLEL MULTI-COMPONENT, FINITE ELEMENT MODEL FOR SIMULATING CRUSTAL-SCALE GROUNDWATER FLOW, HEAT, ISOTOPE, AND NOBLE GAS, AND SILICA TRANSPORT
T102 Emerging and Innovative Approaches to Groundwater ModelingMonday, 23 October 20061:30 PM - 6:00 PM
2005
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GREAT BASIN METALLOGENY: INTERPLAY OF TECTONIC EVENTS, BASEMENT FAULTS, PERMEABILITY, DIVERSE FLUIDS, ROCK BUFFERS, & PHYSICOCHEMICAL TRAPS
T188 Great Basin Tectonics and MetallogenyTuesday, 18 October 20051:30 PM - 5:30 PM
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ORIGIN AND EVOLUTION OF HYDROTHERMAL FLUIDS THAT FORMED THE PORPHYRY CU-MO DEPOSIT IN BUTTE, MONTANA: A MULTI-FACETED FLUID INCLUSION STUDY
T138 Sources of Porphyry Copper Deposits: Magmas, Metals, and Fluids IITuesday, 18 October 20058:00 AM - 12:00 PM
2004
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SOLUBILITY OF METALS AND NUTRIENTS IN BRINES: IMPLICATIONS FOR ORE DEPOSITS, BIOPRODUCTIVITY, AND ANOXIA IN SEDIMENTARY BASINS
T79 Genetic Links among Syngenetic Metal Accumulations in Sedimentary Basins: Giant Sediment-Hosted Metal Deposits to Metalliferous Black ShalesMonday, 8 November 20048:00 AM - 12:00 PM
2003
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THE ROLE OF FAULTS IN THE PLUMBING OF THE GREAT BASIN GEOTHERMAL SYSTEMS AND GOLD MINERALIZATION
T246 A Century of Hydrogeologic Investigations and Groundwater Modeling in the Great Basin: What Have We Learned?Wednesday, 5 November 20031:30 PM - 5:30 PM
2002
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DIVERSE ORIGINS OF SEDIMENTARY ROCK-HOSTED DISSEMINATED GOLD DEPOSITS WORLDWIDE: OVERVIEW
T63 Diverse Origins of Sedimentary Rock-Hosted Disseminated Gold Deposits: A Global PerspectiveMonday, 28 October 20028:00 AM - 12:00 PM
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JURASSIC INTRUSION-RELATED AND EOCENE CARLIN-TYPE GOLD MINERALIZATION IN THE ALLIGATOR RIDGE-BALD MOUNTAIN AREA, EAST-CENTRAL NEVADA
T63 Diverse Origins of Sedimentary Rock-Hosted Disseminated Gold Deposits: A Global PerspectiveMonday, 28 October 20028:00 AM - 12:00 PM
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BAU, MALAYSIA: SRHDG DEPOSIT ASSOCIATED WITH MIOCENE MAGMATISM
T63 Diverse Origins of Sedimentary Rock-Hosted Disseminated Gold Deposits: A Global PerspectiveMonday, 28 October 20028:00 AM - 12:00 PM
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AGDARREH & ZARSHURAN SRHDG DEPOSITS, TAKAB REGION, NW-IRAN
T63 Diverse Origins of Sedimentary Rock-Hosted Disseminated Gold Deposits: A Global PerspectiveMonday, 28 October 20028:00 AM - 12:00 PM
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ALSAR DISTRICT, MACEDONIA: PLIOCENE SRHDG MINERALIZATION ASSOCIATED WITH SHOSHONITIC MAGMATISM
T63 Diverse Origins of Sedimentary Rock-Hosted Disseminated Gold Deposits: A Global PerspectiveMonday, 28 October 20028:00 AM - 12:00 PM
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MESEL SRHDG DEPOSIT AND LOW-SULFIDATION GOLD VEINS IN THE RATATOTOK DISTRICT, NORTH SULAWESI, INDONESIA
T63 Diverse Origins of Sedimentary Rock-Hosted Disseminated Gold Deposits: A Global PerspectiveMonday, 28 October 20028:00 AM - 12:00 PM
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MIDDLE MIOCENE EPITHERMAL AU-AG DEPOSITS RELATED TO CONTINENTAL THOLEIITIC BASALT MAGMATISM, NORTHERN GREAT BASIN, WESTERN USA
82 Economic Geology II: Carlin Au, Low and High Sulfidation Au-Ag-Cu, Porphyry Cu-Mo-Au, and W-Skarn DepositsMonday, 28 October 20021:30 PM - 5:30 PM
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GEOLOGY, GEOCHEMISTRY AND GENESIS OF SEDEX AU ORES ON THE CARLIN TREND, NEVADA
T63 Diverse Origins of Sedimentary Rock-Hosted Disseminated Gold Deposits: A Global PerspectiveMonday, 28 October 20028:00 AM - 12:00 PM
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STRATABOUND SRHDG RESOURCE IN MIDDLE PROTEROZOIC ROCKS OF THE BIG BELT MOUNTAINS NEAR YORK, MONTANA
T63 Diverse Origins of Sedimentary Rock-Hosted Disseminated Gold Deposits: A Global PerspectiveMonday, 28 October 20028:00 AM - 12:00 PM
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HYDROTHERMAL ALTERATION AND STABLE ISOTOPE CONSTRAINTS ON FORMATION OF THE MULE CANYON LOW-SULFIDATION AU-AG DEPOSIT, NORTH-CENTRAL NEVADA
7 Volcanic Arcs and Ores: Links of Magmatic Gases with Porphyry Copper and Epithermal Gold DepositsMonday, 13 May 20028:00 AM - 12:00 PM
Date Unknown
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Integrative Approach to Elucidate the Stratigraphy and Structure of the Roberts Mountains Allochthon and the Gold Deposits That It Conceals in the Independence Range of North Central Nevada, USA
305 Stratigraphy (Posters)
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PALEOZOIC TECTONICS, BRINE MIGRATION, AND FORMATION OF HYDROTHERMAL ZEBRA DOLOMITE, SEDEX AND MVT DEPOSITS ALONG THE CARBONATE PLATFORM IN THE GREAT BASIN
T166 Great Basin Tectonics and Metallogeny (Posters)
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CATHODOLUMINESCENCE AND IN-SITU TRACE ELEMENT AND OXYGEN ISOTOPE ANALYSES OF QUARTZ FROM CARLIN-TYPE AU, SEDEX ZN, AND HOT SPRING AU-AG DEPOSITS
143 Mineralogy/Crystallography; Petrology; Volcanology (Posters)
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GEOCHEMICAL DATA FOR THE GREAT BASIN: A SUBSET OF THE USGS NEW NATIONAL GEOCHEMICAL DATABASE
T166 Great Basin Tectonics and Metallogeny (Posters)
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DETERMINATION OF SOLUTE COMPOSITION OF FLUID INCLUSION IN HYDROTHERMAL MINERALS BY ION CHROMATOGRAPHY: APPLICATIONS TO ORE GENESIS STUDIES
153 Geochemistry (Posters) II