This data release contains analytical data and images for a suite of drill core samples from the Mineral Hill alkaline complex (MHAC), northeastern Wyoming. Geochemistry data include major and trace element analytical results for 103 alkaline igneous rock samples. Images include hand sample photographs of halved core and full thin section images captured in transmitted, plane-polarized and cross-polarized light. Samples are from two core holes drilled by Humble Oil Company in 1970, and subsequently acquired and stored by Felix Mutschler at Eastern Washington University. The two skeletonized (incomplete) drill cores were acquired by the U.S. Geological Survey Geology, Minerals, Energy, and Geophysics Spokane office in 2019, through a co-operative agreement with Eastern Washington University. The collection contains full-core pieces from select intervals representative of the different lithologies and textures in the complex. Mineral Hill is a Paleogene-age, ring-shaped, multi-phase alkaline (miaskitic) igneous complex that intrudes Precambrian schists and lower Paleozoic units of the Tinton uplift on the northwest flank of the broader Black Hills uplift (Welch, 1974; Ray, 1979). The outer ring of the complex is composed of foid syenite and compositionally similar rocks, whereas clinopyroxenite (jacupirangite) and other foid-bearing mafic rocks (ijolite and melteigite) form an irregular inner ring. The center of the complex is composed of a central feldspathic diatreme breccia pipe that exhibits pervasive potassic and sulfidic alteration (DeWitt and others, 1986). Alkali feldspar trachyte/latite porphyry is exposed as large masses in a steep-walled, columnar-jointed zone peripheral to foid syenite of the Mineral Hill dome and as high-angle sills within the central area (Ray, 1979). Alkalic lamprophyres throughout the complex are thought to be related to clinopyroxenite and may have formed from a volatile-rich fraction of the pyroxenite magma (Ray 1979). Pseudoleucite porphyry and melteigite/feldspathic ijolite may be variations of foid syenite and foid clinopyroxenite, respectively. Historic mineral production in the area occurred between the 1870s and 1930s: principally alluvial gold, gold and silver at the Treadwell Mine, and gold and copper at the Interocean Mine. Exploration since 2000 has shown that gold and silver at the Treadwell Mine is related to epithermal-style mineralization and adularia-bearing potassic alteration (Eurasian Minerals Inc., 2016). Higher temperature, porphyry-style potassic alteration associated with gold and copper was identified near the Interocean Mine. Investigations of critical mineral potential in the area have focused on Precambrian pegmatites in the Tinton district which produced some cassiterite (Sn) and tantalite-columbite (Ta) ore, and the Spotted Tail and Sand Creek gold placers which produced some cassiterite (Sn) (Smith and Page, 1941; Hausel, 1990). The critical mineral potential of Paleogene intrusive rocks of the Mineral Hill complex has received comparatively little attention. All samples were analyzed by the U.S. Geological Survey contract laboratory, AGAT Laboratories. Major and trace element concentrations were determined by wavelength dispersive X-ray fluorescence, inductively coupled plasma-optical emission spectrometry or inductively coupled plasma-mass spectrometry (ICP-MS). Additional analytical methods included determination of carbonate carbon by combustion and infrared detection (IR); gold, platinum and palladium by lead fusion fire assay and ICP-MS; fluoride by ion-selective electrode; ferrous iron by titration; non-essential and essential water by gravimetric methods; total sulfur by IR; and gold and platinum group elements by nickel sulfide fire-assay followed by instrumental neutron activation analysis. For each method outlined above, an acceptable criteria for the data has been identified based on 1) if recovery of each element is within a designated percentage at

This dataset includes thin section images, automated mineralogy mineral maps, whole-rock geochemical data, and whole-rock Nd-Sr-Pb isotopic analysis of samples collected from nine mafic-ultramafic outcrops in the Wet Mountains, southern Colorado, during the summer of 2022. These data will accompany an upcoming journal publication and are intended to supplement recently collected airborne magnetic and ground gravity data that indicate a mostly buried mafic-ultramafic intrusion of unknown age (Grauch et al., 2023; Magnin and Anderson, 2023; Magnin et al., 2023). Outcrop locations were identified based on previous mapping by Taylor (1974). A single thin section was made from each sample, and both plain- and cross-polarized light (PPL and XPL, respectively) images were taken of the entire section using a flatbed film scanner. Automated mineralogy (AM) scans were collected from half of each thin section using a TESCAN Integrated Mineral Analyzer (TIMA) at the Colorado School of Mines Mineral and Materials characterization facility. Whole-rock major and trace element geochemistry of samples used for thin sections and of separate compositional layers in thin section JWM-129 (i.e., JWM-129.1, -129.2) were analyzed by Activation Laboratories Ltd., Ancaster, Ontario. Platinum group element chemistry was collected and analyzed by AGAT Laboratories, Calgary, Alberta. Five whole-rock samples and two mineral separates were analyzed using Sm-Nd thermal ionization mass spectrometry (TIMS) at the University of Colorado Boulder TIMS Facility and Clean Room. The same five whole-rock samples were also analyzed for Rb-Sr and Pb-Pb isotopes using TIMS at the same lab. All analyses were performed between October 2022 and February 2024. The images contained in the zip file are categorized by sample name and additionally labeled with PPL, XPL, and AM categories. Automated mineralogy image names end with a letter indicating whether the top (T), bottom (B), left (L), or right (R) half of the thin section was scanned. A csv file of the modal mineral percentages from automated mineralogy is also included in the zip file. Sample locations/descriptions, whole rock geochemistry, Nd-Sr-Pb isotopes, and a data dictionary are included in csv files.

This dataset includes thin section images, automated mineralogy mineral maps, whole-rock geochemical data, and whole-rock Nd-Sr-Pb isotopic analysis of samples collected from nine mafic-ultramafic outcrops in the Wet Mountains, southern Colorado, during the summer of 2022. These data will accompany an upcoming journal publication and are intended to supplement recently collected airborne magnetic and ground gravity data that indicate a mostly buried mafic-ultramafic intrusion of unknown age (Grauch et al., 2023; Magnin and Anderson, 2023; Magnin et al., 2023). Outcrop locations were identified based on previous mapping by Taylor (1974). A single thin section was made from each sample, and both plain- and cross-polarized light (PPL and XPL, respectively) images were taken of the entire section using a flatbed film scanner. Automated mineralogy (AM) scans were collected from half of each thin section using a TESCAN Integrated Mineral Analyzer (TIMA) at the Colorado School of Mines Mineral and Materials characterization facility. Whole-rock major and trace element geochemistry of samples used for thin sections and of separate compositional layers in thin section JWM-129 (i.e., JWM-129.1, -129.2) were analyzed by Activation Laboratories Ltd., Ancaster, Ontario. Platinum group element chemistry was collected and analyzed by AGAT Laboratories, Calgary, Alberta. Five whole-rock samples and two mineral separates were analyzed using Sm-Nd thermal ionization mass spectrometry (TIMS) at the University of Colorado Boulder TIMS Facility and Clean Room. The same five whole-rock samples were also analyzed for Rb-Sr and Pb-Pb isotopes using TIMS at the same lab. All analyses were performed between October 2022 and February 2024. The images contained in the zip file are categorized by sample name and additionally labeled with PPL, XPL, and AM categories. Automated mineralogy image names end with a letter indicating whether the top (T), bottom (B), left (L), or right (R) half of the thin section was scanned. A csv file of the modal mineral percentages from automated mineralogy is also included in the zip file. Sample locations/descriptions, whole rock geochemistry, Nd-Sr-Pb isotopes, and a data dictionary are included in csv files.

This data release includes new major and trace element geochemical data acquired by the U.S. Geological Survey (USGS) for igneous rocks in the Cripple Creek district in Colorado. Cripple Creek is among the largest epithermal districts in the world, with more than 800 metric tons (t) Au (>26.4 Moz). The ores are associated spatially, temporally, and genetically with ~34 to 28 Ma alkaline igneous rocks that were emplaced into an 18 km2- diatreme complex and surrounding Proterozoic rocks (Kelley and others, 2020). Igneous rocks associated with Cripple Creek are part of a regionally extensive episode of Oligocene alkaline magmatism that extended southward along the axis of the Rio Grande rift through New Mexico and into the Trans Pecos region of Texas and northern Mexico (McLemore, 1996; Kelley and Ludington, 2002). The deposits at Cripple Creek are known as alkalic-type gold deposits, but they have been referred to as alkalic-related and Great Plains margin deposits in previous literature (McLemore, 1996). Many of the deposits in this class are enriched in critical elements, the most common of which is tellurium (Kelley and Spry, 2016). However, not all deposits are characterized by enriched tellurium concentrations. Cripple Creek is highly enriched, whereas other deposits in New Mexico are less enriched. The objective of the USGS study was to characterize the tellurium contents (and other trace elements) of predominantly unaltered alkaline igneous rocks that are genetically associated with mineralization in order to better understand possible source(s) and mechanism of enrichment of tellurium in these systems. This data release provides the analytical results of 25 rock hand samples collected by USGS geologists in collaboration with the New Mexico Bureau of Geology and Mineral Resources (NMBGMR) during site visits to Cripple Creek in 1989, 2015, and 2016. In addition, 50 samples collected in 2013 by Anne Rahfeld (Rahfeld, 2013) were submitted and analyzed by the USGS. The mapped rock units from which the samples were collected are described in Wobus and others (1976) and brief descriptions of rock types are given in Kelley and others (1998). Several analytical methods were used and include 55 major and trace elements using inductively coupled plasma-atomic emission spectrometry (ICP-AES) and 42 elements using inductively coupled plasma-atomic emission spectrometry (ICP-AES). Some samples were also analyzed for major elements using wavelength dispersive x-ray fluorescence spectrometry (WDXRF), for Au by fire assay ICP-MS and Au and PGE by fire assay.

This data release includes new major and trace element geochemical data acquired by the U.S. Geological Survey (USGS) for igneous rocks in the Cripple Creek district in Colorado. Cripple Creek is among the largest epithermal districts in the world, with more than 800 metric tons (t) Au (>26.4 Moz). The ores are associated spatially, temporally, and genetically with ~34 to 28 Ma alkaline igneous rocks that were emplaced into an 18 km2- diatreme complex and surrounding Proterozoic rocks (Kelley and others, 2020). Igneous rocks associated with Cripple Creek are part of a regionally extensive episode of Oligocene alkaline magmatism that extended southward along the axis of the Rio Grande rift through New Mexico and into the Trans Pecos region of Texas and northern Mexico (McLemore, 1996; Kelley and Ludington, 2002). The deposits at Cripple Creek are known as alkalic-type gold deposits, but they have been referred to as alkalic-related and Great Plains margin deposits in previous literature (McLemore, 1996). Many of the deposits in this class are enriched in critical elements, the most common of which is tellurium (Kelley and Spry, 2016). However, not all deposits are characterized by enriched tellurium concentrations. Cripple Creek is highly enriched, whereas other deposits in New Mexico are less enriched. The objective of the USGS study was to characterize the tellurium contents (and other trace elements) of predominantly unaltered alkaline igneous rocks that are genetically associated with mineralization in order to better understand possible source(s) and mechanism of enrichment of tellurium in these systems. This data release provides the analytical results of 25 rock hand samples collected by USGS geologists in collaboration with the New Mexico Bureau of Geology and Mineral Resources (NMBGMR) during site visits to Cripple Creek in 1989, 2015, and 2016. In addition, 50 samples collected in 2013 by Anne Rahfeld (Rahfeld, 2013) were submitted and analyzed by the USGS. The mapped rock units from which the samples were collected are described in Wobus and others (1976) and brief descriptions of rock types are given in Kelley and others (1998). Several analytical methods were used and include 55 major and trace elements using inductively coupled plasma-atomic emission spectrometry (ICP-AES) and 42 elements using inductively coupled plasma-atomic emission spectrometry (ICP-AES). Some samples were also analyzed for major elements using wavelength dispersive x-ray fluorescence spectrometry (WDXRF), for Au by fire assay ICP-MS and Au and PGE by fire assay.

This dataset includes geochemical analytical results of rock samples sourced from drill core and hand specimens from the South Kawishiwi, Bald Eagle, Crocodile Lake, Cucumber Lake intrusions, and the Logan Sills, in the Duluth Complex, Minnesota. The dataset includes whole-rock and elemental geochemistry information with analysis methods used and qualifier (filtered) information where applicable, along with CIPW (Cross, Iddings, Pirsson, and Washington) norm data. The data represents a 'best value' version of the data, where the analytical results sourced from the superior analytical method for a particular element were used. The best values methods were picked based upon the method with the lowest detection limit. When two methods had the same lower detection limit, the highest value analytical result was retained as the best value. If a sample was analyzed multiple times, the additional analysis values can be found in the columns ending in "..._all". This data release includes the following files: 1) .csv file (MCR_USGS_geochem_BV.csv) that includes analytical geochemical data and attribute information. 2) .csv file (MCR_USGS_geochem_data_dictionary.csv) of a data dictionary which includes the .csv file column heading and shapefile field definitions. 3) .csv file (MCR_USGS_geochem_methods.csv) of all methods used in the analysis and their descriptions. 4) .csv file (MCR_USGS_geochem_references.csv) that lists sources used in the Strat_03, Strat_04, and Strat_05 columns in the "MCR_USGS_geochem_BV.csv" file. 5) shapefile (MCR_USGS_geochem_locations.shp) representing the locations of samples and drill hole collars.

Mineralogical and lithological data from core samples taken at various geothermal wells in the Great Basin: Dixie Valley, Beowawe, Roosevelt, Mammoth, Steamboat Springs, Coso

Mineralogical and lithological data from core samples taken at various geothermal wells in the Great Basin: Dixie Valley, Beowawe, Roosevelt, Mammoth, Steamboat Springs, Coso

Mineralogical, lithological, and geospatial data of drill cuttings from exploration production wells in Beowawe, Dixie Valley and Roosvelt Hot Springs. These data support whole rock analyses for major, minor and critical elements to assess critical metals in produced fluids from Nevada and Utah geothermal fields. The samples were analyzed by x-ray diffraction (legacy data) and then checked by thin section analysis.

Mineralogical, lithological, and geospatial data of drill cuttings from exploration production wells in Beowawe, Dixie Valley and Roosvelt Hot Springs. These data support whole rock analyses for major, minor and critical elements to assess critical metals in produced fluids from Nevada and Utah geothermal fields. The samples were analyzed by x-ray diffraction (legacy data) and then checked by thin section analysis.