Item talk:Q226811

{

 "@context": "http://schema.org/",
 "@type": "WebPage",
 "additionalType": "Research",
 "url": "https://www.usgs.gov/centers/alaska-science-center/science/critical-minerals-alaska-placer-deposits-and-southeast-alaska",
 "headline": "Critical Minerals in Alaska Placer Deposits and Southeast Alaska Mineral Systems",
 "datePublished": "May 23, 2024",
 "author": [
   {
     "@type": "Person",
     "name": "Susan Karl",
     "url": "https://www.usgs.gov/staff-profiles/susan-karl",
     "identifier": {
       "@type": "PropertyValue",
       "propertyID": "orcid",
       "value": "0000-0003-1559-7826"
     }
   }
 ],
 "description": [
   {
     "@type": "TextObject",
     "text": "This project builds on completed geospatial prospectivity analyses for critical minerals and gold in Alaska (Karl et al., 2016; 2021). The preliminary prospectivity analyses provide additional constraints on selecting specific placer deposits to sample and inventory critical minerals present in a variety of mineral systems. Deposits associated with different mineral systems may have distinct geochemical and critical mineral enrichments. Sampling and inventorying placers that are related to diverse metallogenic sources provides a more complete understanding and ultimately predictive capability for additional resources across the state."
   },
   {
     "@type": "TextObject",
     "text": "Return to Geology >> AK Mine Waste"
   },
   {
     "@type": "TextObject",
     "text": "Critical minerals have been identified in most Alaskan placers, yet little is known about the concentration of these phases. Historic and active placer mines have typically produced gold and are widespread across Alaska. Activity in the placer districts has resulted in gravel piles and sluice tailings that are products of   gold mining. Gold has been the traditional target of placer mining; however, mechanical and physical sorting of mineral phases known to host important critical minerals such as tungsten and tin occurs through similar processes as gold concentration. Knowledge of the degree to which commodities other than gold have been concentrated in placers is lacking due to historic interest, almost exclusively, in gold for economic reasons"
   },
   {
     "@type": "TextObject",
     "text": "Preliminary results confirmed sample collection protocols.  Twenty-three samples were collected during the 2023 field season from many of the main mineral systems that contain different suites of critical minerals around the state (fig. 1). The remaining target areas will be sampled in 2024. The samples collected in 2023 will be processed according to protocols developed in the pilot study."
   },
   {
     "@type": "TextObject",
     "text": "Beginning in 2022, eight bulk samples of placer tailings were collected from the historic Flat district in southwest Alaska. Flat was the third largest placer gold producer in Alaska in the early 1900\u2019s, following the Fairbanks and Nome districts. The drainages sampled have source regions that include known mineral occurrences with enrichments in tin, tungsten and arsenic. Chemical and mineralogical analysis of multiple size fractions will identify host minerals including the elemental compositions to better characterize the distribution of critical minerals in the placers."
   }
 ],
 "funder": {
   "@type": "Organization",
   "name": "Alaska Science Center",
   "url": "https://www.usgs.gov/centers/alaska-science-center"
 },
 "about": [
   {
     "@type": "Thing",
     "name": "Alaska"
   },
   {
     "@type": "Thing",
     "name": "Earth Mapping Resources Initiative (Earth MRI)"
   },
   {
     "@type": "Thing",
     "name": "critical minerals"
   },
   {
     "@type": "Thing",
     "name": "Placer"
   },
   {
     "@type": "Thing",
     "name": "Mine Waste"
   },
   {
     "@type": "Thing",
     "name": "Methods and Analysis"
   },
   {
     "@type": "Thing",
     "name": "Geology"
   },
   {
     "@type": "Thing",
     "name": "mineral resource potential"
   },
   {
     "@type": "Thing",
     "name": "Information Systems"
   },
   {
     "@type": "Thing",
     "name": "Energy"
   },
   {
     "@type": "Thing",
     "name": "critical elements"
   },
   {
     "@type": "Thing",
     "name": "Mineral Resources Program (MRP)"
   },
   {
     "@type": "Thing",
     "name": "Environmental Health"
   },
   {
     "@type": "Thing",
     "name": "Minerals"
   },
   {
     "@type": "Thing",
     "name": "Science Technology"
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   {
     "@type": "Thing",
     "name": "Critical Mineral Resources"
   },
   {
     "@type": "Thing",
     "name": "Water"
   }
 ]

}