This data release provides quantitative whole rock geochemical results from The Geysers vapor-dominated geothermal field in California. The concentrations of major elements are reported in oxide weight percent by wavelength dispersive x-ray fluorescence (WDXRF), the concentrations for sixty elements are reported in elemental weight percent (pct) or parts per million (ppm) from inductively coupled plasma-optical emission spectrometry-mass spectrometry ICP-OES-MS analysis, mercury is reported in ppm by cold vapor atomic absorption spectrometry (CVAAS), and ammonium in ppm from automated colorimetry analysis. The analyses show significant enrichment of volatile elements and elements such as sulfur, boron, arsenic, and mercury. Mineral scales from the Northwest Geysers are characterized by high concentrations of ammonium and mercury while the mineral scales from the Central and Southeast Geysers are enriched in boron, iron and sulfur. The mineral scales from orifice plates and condensers contain significant concentrations of Cr, Ni, Co, Zn, and W which are common contaminants from rusted steel equipment.

This dataset is a collection of geochemical data on samples from the Stibnite-Yellow Pine district of Idaho. The datasets include: whole rock geochemistry; lead, strontium and neodymium isotope chemistry of sulfides and whole rock samples by isotope dilution-thermal-mass spectrometry (ID-TIMS); in situ sulfur isotope chemistry of sulfides by laser ablation-multi collector-inductively coupled-mass spectrometry (LA-MC-ICP-MS); electron microprobe (EMP) images, cathodoluminescence (CL) images and spectra, along with EMP and laser ablation-inductively coupled-mass spectrometry (LA-ICP-MS) trace element analysis of sulfides and quartz; and fluid inclusion microthermometry and raman. Samples were collected from the surface and from a series of drill holes transecting the Yellow Pine, Hangar Flats, and West End deposits within the district. Sample were submitted for USGS contract laboratory analysis and processed for ID-TIMS isotopic analysis. High-contrast backscattered electron (BSE) scanning electron microscope SEM imaging were collected to determine zonation, followed by of EMP analysis, followed by a selection of LA-ICP-MS and LA-MC-ICP-MS analysis. After determining mineral and fluid inclusion paragenesis by studying optical petrography and SEM imagery, fluid inclusion microthermometric data and raman spectra were collected.

This dataset is a collection of geochemical data on samples from the Stibnite-Yellow Pine district of Idaho. The datasets include: whole rock geochemistry; lead, strontium and neodymium isotope chemistry of sulfides and whole rock samples by isotope dilution-thermal-mass spectrometry (ID-TIMS); in situ sulfur isotope chemistry of sulfides by laser ablation-multi collector-inductively coupled-mass spectrometry (LA-MC-ICP-MS); electron microprobe (EMP) images, cathodoluminescence (CL) images and spectra, along with EMP and laser ablation-inductively coupled-mass spectrometry (LA-ICP-MS) trace element analysis of sulfides and quartz; and fluid inclusion microthermometry and raman. Samples were collected from the surface and from a series of drill holes transecting the Yellow Pine, Hangar Flats, and West End deposits within the district. Sample were submitted for USGS contract laboratory analysis and processed for ID-TIMS isotopic analysis. High-contrast backscattered electron (BSE) scanning electron microscope SEM imaging were collected to determine zonation, followed by of EMP analysis, followed by a selection of LA-ICP-MS and LA-MC-ICP-MS analysis. After determining mineral and fluid inclusion paragenesis by studying optical petrography and SEM imagery, fluid inclusion microthermometric data and raman spectra were collected.

This dataset is a compilation of samples collected from draining mine adits, including water and mineral precipitates, from several mines in California and Colorado. The Golinsky, Copper Bluff, and Afterthought Mines (located in northern California) and the Gold King mine (located in southern Colorado) have historically operated to recover metals including copper, lead, zinc, gold, silver and other resources (Albers and Robertson, 1961; USGS, 2005; USEPA, 2015). Data reported include field parameters, water chemistry, solid phase mineralogy and solid phase chemistry. Water samples collected from the four mine sites in 2019 were analyzed for unfiltered and filtered (0.1-0.45 micrometer) major and trace elements and iron oxidation state. At the Gold King Mine, water samples were collected at a draining adit and along a pipeline conveying water to a treatment plant. A small number of additional samples were collected from mine features near the Gold King Mine, including the Red and Bonita and Mogul Mines, as well as the American Tunnel. When available, solid samples were concurrently collected with the water samples and analyzed for bulk mineralogy and chemical composition. References: Albers, J.P., and Robertson, J.F., 1961, Geology and Ore Deposits of East Shasta Copper-Zinc District Shasta County, California: U.S. Geological Survey Professional Paper 338. [Also available at https://doi.org/10.3133/pp338.] U.S. Environmental Protection Agency, 2015, Gold King Mine - Watershed Fact Sheet: U.S. Environmental Protection Agency Fact Sheet 2015-08, accessed December 14, 2022, at https://www.epa.gov/sites/default/files/2015-08/documents/goldkingminewatershedfactsheetbackground.pdf. U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.