Filters: Tags: Monazite (X)6 results (6ms)
Analyses of historic U.S. Bureau of Mines rock and heavy mineral concentrate samples for geochemical trace-element and rare-earth element data--Ray Mountains and Kanuti-Hodzana uplands area, Alaska
Re-analyses of sample pulps and bulk rejects from historic USBM rock and heavy-mineral-concentrate samples were conducted by the Alaska Division of Geological & Geophysical Surveys (DGGS) as part of the State of Alaska's Strategic and Critical Minerals Assessment project, which is designed to evaluate Alaska's potential for these resources. The objective of this resource assessment is to expand the state's geochemical database by obtaining and publishing modern, quantitative geochemical analyses for historic USBM samples, where available. Highlights of this re-analysis project include heavy mineral concentrates with up 7,220 ppm Sn, 5,870 ppm Cr, and 17,000 ppm Mn.
Electron microprobe data for monazite and xenotime used in consideration of gold deposit formation models
The genetic origin of many gold deposits, including Pogo in Alaska, remains controversial with questions as to whether they formed due to magmatic-hydrothermal or metamorphic-hydrothermal fluids. Gaining a better understanding of the formation mechanisms for these deposits is critical for defining proper exploration criteria in gold-bearing regions and production within these deposits. Monazite are light rare earth (LREE)-bearing and xenotime are heavy rare earth (HREE)-bearing phosphate minerals that are found as alteration products in many different gold deposits. In addition to their importance in geochronological investigations, their minor element chemistry may be used to differentiate between metamorphic,...
Geochemical major-oxide, minor-oxide, trace-element, and rare-earth-element data from rocks and streams sediments collected in 2012 in the Ray Mountains area, Beaver, Bettles, Livengood, and Tanana quadrangles, Alaska
Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys (DGGS) carried out a helicopter-supported geological and geochemical resource assessment project in the Beaver, Bettles, Livengood, and Tanana quadrangles from June 23 through August 5, 2012. The objectives of DGGS's resource assessment are to improve the trace-element geochemical coverage of selected watersheds; to obtain modern, quantitative geochemical analyses; to understand the petrogenesis of the granites; and to better document established mineral occurrences. Stream-sediment, pan-concentrate, and rock sampling were conducted as part of the State's Rare Earth Elements and Strategic Minerals Assessment project, which is...
Geochemical major-oxide, minor-oxide, trace-element, and rare-earth-element data from rock samples collected in 2013 in the Ray Mountains area, Bettles A-1 and A-6 quadrangles, Alaska
In 2012, the State of Alaska established its Strategic and Critical Minerals (SCM) Assessment project, a State-funded Capital Improvement Project (CIP), to evaluate Alaska's statewide potential for SCM resources. The project is being implemented by the Alaska Division of Geological & Geophysical Surveys (DGGS), and involves obtaining new airborne-geophysical, geological, and geochemical data. For decades, the Ray Mountains area of west-central Alaska has been explored for its potential mineral resources. To further assess the rare-earth-element (REE) potential of the State-selected and top-filed lands in the Ray Mountains area, mineral-resource geologists at DGGS carried out a helicopter-supported geological and...
Rare Earth-Thorium-Hematite and Copper Mineralization in Proterozoic Rocks at Lemhi Pass, Idaho-Montana, 2021, Virginia S. Gillerman, Michael J. Jercinovic, Mark D. Schmitz, and Paul Layer
Rare Earth-Thorium-Hematite and Copper Mineralization in Proterozoic Rocks at Lemhi Pass, Idaho-Montana, 2021, Virginia S. Gillerman, Michael J. Jercinovic, Mark D. Schmitz, and Paul Layer The Lemhi Pass district is located along the Continental Divide in the Beaverhead Mountains of Idaho and Montana. Small copper and copper-gold mines were worked in the early 1900s. In the late 1940s, a large number of thorium veins were located and explored in the district. Thorium rare-earth element (Th-REE) mineralization is present as quartz veins and biotite-rich replacements with abundant specular hematite, thorite, and monazite. Host rocks are Mesoproterozoic quartzite and siltite, which have been correlated primarily...
This data release contains the U.S. salient statistics and world production data extracted from the RARE EARTHS data sheet of the USGS Mineral Commodity Summaries 2022.