Item talk:Q227036

{

 "@context": "http://schema.org/",
 "@type": "WebPage",
 "additionalType": "Project",
 "url": "https://www.usgs.gov/centers/colorado-water-science-center/science/isotopic-and-environmental-tracers-improved",
 "headline": "Isotopic and environmental tracers for improved understanding of geochemical and hydrologic processes occurring near flooded mine workings",
 "datePublished": "August 24, 2023",
 "author": [
   {
     "@type": "Person",
     "name": "Connor Patrick Newman",
     "url": "https://www.usgs.gov/staff-profiles/connor-patrick-newman",
     "identifier": {
       "@type": "PropertyValue",
       "propertyID": "orcid",
       "value": "0000-0002-6978-3440"
     }
   }
 ],
 "description": [
   {
     "@type": "TextObject",
     "text": "Results from the Captain Jack mine site, located west of Boulder, Colorado, indicated that the groundwater system is disconnected and that the water within the mine workings has very little connection to the groundwater in the adjacent bedrock. Extremely high hydraulic gradients are maintained between the bedrock and mine groundwaters, even when water is impounded within the mine workings (see figure below)."
   },
   {
     "@type": "TextObject",
     "text": "EPA Superfund Site: Captain Jack Mill, Ward, CO - https://cumulis.epa.gov/supercpad/cursites/csitinfo.cfm?id=0800892"
   },
   {
     "@type": "TextObject",
     "text": "Based on stable isotopes and groundwater age indicators it appears that old groundwater sustains high metal concentrations flowing into the impounded mine water and that sulfide oxidation (the process that generates AMD) can still occur when the workings are flooded (see figure below)."
   },
   {
     "@type": "TextObject",
     "text": "In cooperation with the U.S. Environmental Protection Agency (EPA), the U.S. Geological Survey (USGS) is working to investigate processes controlling groundwater flow and acid mine drainage (AMD) geochemistry in several locations with hydraulic bulkheading. This research assists in understanding the potential efficacy of the bulkhead remediation strategy at other locations within the western United States."
   },
   {
     "@type": "TextObject",
     "text": "Draining mine tunnels contribute metals and acidity to streams throughout the western United States. One remediation strategy that is increasing in usage is the emplacement of hydraulic bulkheads to impound water within the subsurface. Potential secondary effects of bulkhead usage are difficult to quantify however because of the inherent complexity of most mountain hydrologic systems."
   },
   {
     "@type": "TextObject",
     "text": "Geochemistry, mineralogy, and acid-generating behaviour of efflorescent sulphate salts in underground mines in Nevada, USA - https://doi.org/10.1144/geochem2018-074"
   },
   {
     "@type": "TextObject",
     "text": "In order to gain understanding of the hydrologic and geochemical processes occurring in the subsurface, the USGS collects water-quality data from draining mines, groundwater wells, and springs. A comprehensive suite of water-quality parameters is utilized including trace metals, rare earth elements (REE), stable isotopes, tritium, carbon-14, and noble gases. These water-quality data are paired with hydrologic evaluation of the groundwater-flow regime to quantify hydrological and geochemical processes affecting water quality in flooded mine workings, which can inform remedial decisions."
   }
 ],
 "funder": {
   "@type": "Organization",
   "name": "Colorado Water Science Center",
   "url": "https://www.usgs.gov/centers/colorado-water-science-center"
 },
 "about": [
   {
     "@type": "Thing",
     "name": "Model Development"
   },
   {
     "@type": "Thing",
     "name": "statistical analysis"
   },
   {
     "@type": "Thing",
     "name": "Science Technology"
   },
   {
     "@type": "Thing",
     "name": "Acid-Mine Drainage"
   },
   {
     "@type": "Thing",
     "name": "noble gases"
   },
   {
     "@type": "Thing",
     "name": "Methods and Analysis"
   },
   {
     "@type": "Thing",
     "name": "Environmental Health"
   },
   {
     "@type": "Thing",
     "name": "Information Systems"
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   {
     "@type": "Thing",
     "name": "Geology"
   },
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     "name": "stable isotopes"
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     "@type": "Thing",
     "name": "Modeling"
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     "@type": "Thing",
     "name": "Groundwater"
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     "name": "Water"
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     "name": "geochemical modeling"
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     "@type": "Thing",
     "name": "Energy"
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