Download or read book Crystal Mountain Fluorite Deposits Ravalli County Mont written by John W. Taber and published by . This book was released on 1952 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mineralogy and Fluid Inclusion Study of the Crystal Mountain Fluorite Mine Ravalli County Montana written by Francis Grondin and published by . This book was released on 2019 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Crystal Mountain Fluorite Mine, known for its vast amounts of massively grown fluorite and rare accessory minerals including fergusonite (YNbO4) and thortveitite (Sc2Si2O7), is located in the Sapphire Mountains 22 km east of the town of Darby, Montana. This site has been mined previously between the years of 1954 through 1973. The Taber collection of drill core, thin sections, mine maps and miscellaneous reports on Crystal Mountain was recently donated to the Montana Bureau of Mines and Geology for future studies. The purpose of the present study has been to use modern methods of mineral identification and fluid inclusions on these samples to better understand the origin of the deposit. Hand samples collected from drill core and in the field were made into polished sections for analysis by SEM-EDS, Raman spectroscopy, and fluid inclusion microthermometry. The fluorite itself varies from colorless to deep purple, and is strongly enriched in yttrium (average of 1.51 wt% Y). The ore bodies were essentially pure fluorite in shallow-dipping masses up to 7 meters thick and > 40 m in diameter. Impurities included silicate minerals (albite, phlogopite, quartz), Fe-oxides, titanite, apatite, thortveitite, sulfide minerals (pyrite, pyrrhotite, chalcopyrite), thorite, fergusonite, allanite, xenotime, monazite, and other REE-rich minerals. Thin sections of country rock show weak K-metasomatism in the form of orthoclase replacing plagioclase and phlogopite replacing amphibole. However, this alteration is subtle and is easily missed by visual inspection of outcrops and hand samples. Near contacts with country rock, fluorite is intergrown with silicate minerals in a texture that appears igneous.Two populations of fluid inclusions were found in the fluorite. Primary inclusions average 100́315 ℗æm in size, are distributed randomly throughout the fluorite, and have homogenization temperatures from 350 to > 500 ℗ðC. All primary inclusions contain multiple daughter minerals including halite, sylvite, ankerite, siderite, and quartz. Salinities determined by the temperatures of halite dissolution ranged from 35 to 56 wt% NaCl. Secondary fluid inclusions, which occur along healed fractures in the fluorite, are bigger at an average of 300́350 ℗æm, with no daughter minerals. However, these inclusions contain a double bubble at room temperature which indicates a high CO2 content. Based on fluid inclusion geobarometry, the fluorite at Crystal Mountain formed at a minimum pressure of about 3 kbar, which corresponds to a depth of > 10 km.The above observations suggest that Crystal Mountain is a unique example of a magmatic fluorite deposit formed by crystallization of a fluoro-silicate melt that separated from a granitic melt. This model is consistent with the high temperatures, high pressures, and elevated concentrations of incompatible elements (Y, Nb, Ti, Sc, Th, REE) in the deposit, as well as the geometry of the massive fluorite ore bodies. Similar high temperature and high salinity fluid inclusions have been found in other fluorite deposits of western Montana, including the Snowbird, Spar, and Wilson Gulch deposits. More work is needed to determine the ages of these deposits and how they relate to one another.
Download or read book Fluorspar Prospects of Montana written by Clyde Polhemus Ross and published by . This book was released on 1950 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface Mining Second Edition written by Bruce A. Kennedy and published by SME. This book was released on 1990 with total page 1214 pages. Available in PDF, EPUB and Kindle. Book excerpt: This SME classic is both a reference book for the working engineer and a textbook for the mining student. This hardcover edition gives a brief history of surface mining and a general overview of the state of surface mining today--topics range from production and productivity to technological developments and trends in equipment. This extremely useful text takes the approach that exploration and mining geologists must be expert in a number of fields, including basic finance and economics, logistics, and pragmatic prospecting. Readers will find material on all these topics and more. The book's nine chapters include: Introduction, Exploration and Geology Techniques, Ore Reserve Estimation, Feasibility Studies and Project Financing, Planning and Design of Surface Mines, Mine Operations, Mine Capital and Operating Costs, Management and Organization, and Case Studies. The book is fully indexed.
Download or read book Geological Survey Professional Paper written by Geological Survey (U.S.) and published by . This book was released on 1963 with total page 1026 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey Professional Paper written by and published by . This book was released on 1975 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geological Survey Bulletin written by and published by . This book was released on 1963 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mineralogic Classification of Uranium vanadium Deposits of the Colorado Plateau written by Theodore Botinelly and published by . This book was released on 1957 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mineral and Water Resources of Montana written by United States. Congress. Senate. Interior and Insular Affairs and published by . This book was released on 1963 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Permissible Mine Equipment Approved by the Bureau of Mines During 1963 64 written by Frank R. Lee and published by . This book was released on 1966 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Geological Survey Professional Paper written by and published by . This book was released on 1973 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Information Circular written by and published by . This book was released on 1966 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reconnaissance for Radioactive Minerals in Washington Idaho and Western Montana 1952 1955 written by Paul Lester Weis and published by . This book was released on 1958 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Minerals Yearbook written by and published by . This book was released on 1964 with total page 1330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Short Papers in Geology and Hydrology Articles 1 59 written by Geological Survey (U.S.) and published by . This book was released on 1963 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bureau of Mines Information Circular written by and published by . This book was released on 1966 with total page 866 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Rare earth Elements Yttrium and Thorium written by John G. Parker and published by . This book was released on 1971 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
