 | | Journal (article/letter/editorial) | | History 2001 Colorado Boulevard Denver, Colorado 80205 D iamonds were first discovered in Colorado twenty-five...Minerals of Colorado (Eckel et al. 1997), first heard the report of diamonds occurring in Colorado, we thought...thought it was just another diamond hoax. There had been a scandalous hoax in 1872 that had upset the financial...financial world for a short time and put Colorado in the headlines (Hausel and Stahl 1995). It began...Bank of California that they had lound a rich diamond field in the little-known western interior of the |  | | Report (issue) | | WYOMING STATE GEOLOGICAL SURVEY Ronald C. Surdam, State Geologist SEARCHING FOR PLACER DIAMONDS by...LARAMIE, WYOMING 2004 WYOMING STATE GEOLOGICAL SURVEY Ronald C. Surdam, State Geologist GEOLOGICAL SURVEY...Likwartz, Oil and Gas Supervisor Ronald C. Surdam, State Geologist Appointed Ronald A. Baugh, Casper Gordon...and other publications available from: Wyoming State Geological Survey P.O. Box 1347 Laramie, WY 82073-1347...publication should contact the Editor, Wyoming State Geological Survey at (307) 766-2286. TTY Relay operator |  | | Journal (article/letter/editorial) | | Institution Washington, DC 20013 pohwatp@si.edu DIAMOND Dutoitspan Mine, Kimberley Northern Cape Province...barefooted traveler. Gardner F. Williams in The Diamond Mines of South Africa (1904, p. 115) T he valley...Ralston (of Comstock Lode fame) was excited by a new diamond find somewhere in “a remote section of the United...were close-mouthed about the location of this diamond find but eventually agreed to conduct two people...valued at $150,000 by Tiffany’s, and a qualified mining engineer, in the person of Henry Janin, was dispatched |  | | Journal (article/letter/editorial) | | Two Point claim, Pikes Peak batholith, Teller County. The Collector’s Edge specimen, Jeff Scovil photo...Mail Stop 150, Box 25046 Federal Center Denver, Colorado 80225 pmodreski@usgs.gov C olorado is, of course...prospectors and other adventurous pioneers to the state, to the other ore and gangue minerals of hydrothermal...prohibitions on collecting or to private land or mining claims for which permission has been obtained....been written as guides to mineral collecting in Colorado. A classic, which went through three major editions |  | | Journal (article/letter/editorial) | | Museum of Nature and Science 2001 Colorado Boulevard Denver, Colorado 80205-5798 jmurphy @ dmns.org PETER...Survey MS 150, Box 25046 Federal Center Denver, Colorado 80225-0046 pmodresk @ usgs.gov Unless otherwise...to 2000) J oin us for a gemstone tour around Colorado! Our field trip takes us from east to west in...in the same way you may have toured through Colorado on a mineral collecting trip. This route, from the...gemstones are known to occur. We cannot discuss every Colorado gemstone occurrence; rather, this is a general |  | | Journal (issue) | | Page Diamonds in Colorado! The State Line Kimberlite District, Colorado & Wyoming, USA By Philip Persson...Platinum By Van King, newryqs@gmail.com Unusual Diamond localities of the United States By Yinan Wang,...Mineralogy and History of Silver Deposits in the Calico District, California By Jeremy Zolan, jzolansci@gmail.com... 54 Page 28 42 48 Page Page COVER IMAGE: Diamond Crystal in Matrix Crystal Edge: 55cm Mir Pipe,...Introducing Gemdat A Guided Tour Best Minerals - Diamond, Platinum, Gold and Silver Mindat is a free worldwide |  | | Journal (article/letter/editorial) | | have at times been unable to discover economic diamond occurrences that were luter found by less-experienced...good specimens. On the other hand, a “high-grade” diamond Occurrence would only contain a few more or less...processes used in most nonplacer diamond mines, results in diamond specimens, particularly those containing...response to the “diamond“ theme of this year’s Munich Show, we have chosen a superb diamond specimen from...hardness, equating that with indestructibility. Diamond hiis been assigned a hardness value of 10, only |  | Schulze, Daniel J., Coopersmith, Howard G., Harte, Ben, Pizzolato, Lori-Ann (2008) Mineral inclusions in diamonds from the Kelsey Lake Mine, Colorado, USA: Depleted Archean mantle beneath the Proterozoic Yavapai province. Geochimica et Cosmochimica Acta, 72 (6) 1685-1695 doi:10.1016/j.gca.2007.09.037 | Journal (article/letter/editorial) | | Mineral inclusions in diamonds from the Kelsey Lake Mine, Colorado, USA: Depleted Archean mantle beneath the...Associates, P.O. Box 1916, Fort Collins, CO 80522, USA School of GeoSciences, Grant Institute of Earth Science...diamonds from the Kelsey Lake Mine in the Colorado-Wyoming State Line Kimberlite district. Eighteen olivines...stark contrast to the other diamond suites studied in the State Line district (Sloan, George Creek), which...which are overwhelmingly eclogitic. Kelsey Lake olivine inclusions are magnesian (17 of 18 grains in 9 |  | | Journal (article/letter/editorial) | | Significance of Ilmenite Megacrysts and Macrocrysts from Kimberlite a a b Daniel J. Schulze , Patrick F. N. Anderson...Significance of Ilmenite Megacrysts and Macrocrysts from Kimberlite, International Geology Review, 37:9, 780-812...Significance of Ilmenite Megacrysts and Macrocrysts from Kimberlite D A N I E L J. S C H U L Z E , P A T R I C K...magnesite mega crysts during kimberlite ascent may have enriched kimberlite hosts in Mg, contributing to...suggesting that the oxidation state of the kimberlite, and thus its potential for diamond resorption, can be overestimated |  | | Journal (article/letter/editorial) | | Libraries] at 07:46 29 December 2014 Arvada, Colorado 80004 The "Ferris outlier," named for the Ferris...preserved from erosion by having been dropped into a kimberlite diatreme of probable Devonian age. This occurred...Silurian rocks. especially, were not known from Colorado and most of Wyoming and New Mexico. Textbooks...middle Paleozoic age exist in the vicinity of the Colorado-Wyoming border. The events leading to this discovery...memory. My family moved to a ranch on the Colorado-Wyoming state line, south of Laramie. Wyoming, just before |  | | Report (issue) | | Prepared in cooperation with the Colorado Geological Survey for the United States Department of Agriculture...Service Development of Industrial Minerals in Colorado Circular 1368 U.S. Department of the Interior...Survey Development of Industrial Minerals in Colorado By Belinda F. Arbogast, Daniel H. Knepper, William...John S. Dersch Prepared in cooperation with the Colorado Geological Survey for the United States Department..., 2011, Development of industrial minerals in Colorado: U.S. Geological Survey Circular 1368, 87 p. Library |  | | Report (issue) | | WYOMING STATE GEOLOGICAL SURVEY Ronald C. Surdam, State Geologist GUIDE TO PROSPECTING AND ROCK HUNTING...LARAMIE, WYOMING 2004 WYOMING STATE GEOLOGICAL SURVEY Ronald C. Surdam, State Geologist GEOLOGICAL SURVEY...Likwartz, Oil and Gas Supervisor Ronald C. Surdam, State Geologist Appointed Ronald A. Baugh, Casper Gordon...and other publications available from: Wyoming State Geological Survey P.O. Box 1347 Laramie, WY 82073-1347...publication should contact the Editor, Wyoming State Geological Survey at (307) 766-2286. TTY Relay operator |  | Van Rythoven, A.D., Schulze, D.J., Hauri, E.H., Wang, J., Shirey, S. (2017) Intra-crystal co-variations of carbon isotopes and nitrogen contents in diamond from three North American cratons. Chemical Geology, 467. 12-29 doi:10.1016/j.chemgeo.2017.06.027 | Journal (article/letter/editorial) | | co-variations of carbon isotopes and nitrogen contents in diamond from three North American cratons A.D. Van Rythoven...co-variations of carbon isotopes and nitrogen contents in diamond from three North American cratons, Chemical Geology...Co-variations of Carbon Isotopes and Nitrogen Contents in Diamond from Three North American Cratons A.D. Van Rythoven1...America. Abstract PT Eighteen diamond samples from the A154 South kimberlite pipe (Diavik Mine), Slave Craton...Territories (Canada); sixteen diamond samples from the Lynx CE kimberlite dyke, Superior Craton, Quebec |  | | Journal (article/letter/editorial) | | MANTLE XENOCRYSTS FROM THE MASONTOWN, PENNSYLVANIA KIMBERLITE: AN ORDINARY MANTLE WITH Si-ENRICHED SPINEL DANIEL...Virginia, USA 22092 and Smithsonian Institution, Washington, D.C., USA ABSTRACT A hypabyssal kimberlite dike...dike in southwestern Pennsylvania (USA), emplaced through Proterozoic basement and Phanerozic cover, contains...170 km) indicate some sampling in the field of diamond stability. Diamonds have not been reported, however...consistent with diamond absence and the off-craton tectonic setting of the kimberlite. An unusual feature |  | | Book | | Top 6 7 1 Top Bottom Bottom 3 4 5 1 DIAMOND DEPOSITS Origin, Exploration, and History of Discovery...SME diamond_title2 9/3/02 9:29 AM Page 1 DIAMOND DEPOSITS Origin, Exploration, and History of Discovery...Society for Mining, Metallurgy, and Exploration, Inc. © 2002 by the Society for Mining, Metallurgy,... Society for Mining, Metallurgy, and Exploration, Inc. (SME) 8307 Shaffer Parkway Littleton, CO, USA 80127 (303)...763-3132 www.smenet.org SME advances the worldwide mining and minerals community through information exchange |  | | Journal (article/letter/editorial) | | Copyright © 2001 Elsevier Science Ltd Printed in the USA. All rights reserved 0016-7037/01 $20.00 ⫹ .00 Pergamon...isotope variations in Cr-poor megacrysts from kimberlite DANIEL J. SCHULZE,1,* JOHN R. VALLEY,2 DAVID...53706, USA Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, USA and Department...Cr-poor megacrysts from kimberlite demonstrate that the megacrysts and kimberlite hosts are genetically...higher ␦18O). Actual samples of potential Group II kimberlite source rocks (e.g., mica/ amphibole veined peridotites) |  | Sobolev, Nikolai V., Logvinova, Alla M., Zedgenizov, Dmitry A., Pokhilenko, Nikolai P., Kuzmin, Dmitry V., Sobolev, Alexander (2008) Olivine inclusions in Siberian diamonds: high-precision approach to minor elements. European Journal of Mineralogy, 20 (3) 305-315 doi:10.1127/0935-1221/2008/0020-1829 | Journal (article/letter/editorial) | | two main types of geological environment support diamond formation: they are ultramafic (or peridotitic)...eclogites in kimberlites. In primary, diamond-bearing kimberlite and lamproite rocks the ratio of diamonds...diamonds dominate in the overwhelming majority of diamond occurrences worldwide. Olivine is the most typical...single polished surface with diamond. Olivine from diamonds of the Snap Lake dyke system (Canada) were studied...grain of such composition located in the inner diamond growth zone is associated with an olivine grain |  | Griffin, W.L., O'Reilly, Suzanne Y., Doyle, B.J., Pearson, N.J., Coopersmith, H., Kivi, K., Malkovets, V., Pokhilenko, N. (2004) Lithosphere mapping beneath the North American plate☆. Lithos, 77 (1) 873-922 doi:10.1016/j.lithos.2004.03.034 | Journal (article/letter/editorial) | | Sydney, NSW 2109, Australia b CSIRO Exploration and Mining, North Ryde, NSW 2113, Australia c Kennecott Canada...V6C 1S4 d Great Western Diamond Co., PO Box 1916, Fort Collins, CO 80522, USA e Kennecott Canada Exploration...Laurentian continental core (W. Greenland, Colorado – Wyoming district, Arkansas) show discontinuities and gaps...beneath the Colorado Plateau is significantly less refractory. The SCLM beneath the Kansas kimberlite field...Kyle Lake Pipe U Fancy Creek Lone Tree Leonardville Stockdale Winkler C-14 A4 Tandem B30 Diamond Lake |  | | Journal (issue) | | Colorado Springs Mineralogical Society Founded in 1936 Lazard Cahn Honorary President September 2018...20, 7:00 PM Speaker: Bob Hickey Topic: Central Colorado Mountain Building Please note: Members whose last...Assembly meeting. COLORADO SPRINGS MINERALOGICAL SOCIETY PO BOX 2 COLORADO SPRINGS, COLORADO 80901-0002 September...Members Submitted by Pete Modreski Sep. 7-15, Colorado Mineral and Fossil Fall Show, Crowne Plaza Hotel...Wed. Sept. 19, 7:30 p.m., Friends of Mineralogy, Colorado Chapter, bimonthly meeting, after the Denver Gem |  | Ashchepkov, I.V., Vladykin, N.V., Ntaflos, T., Downes, H., Mitchell, R., Smelov, A.P., Alymova, N.V., Kostrovitsky, S.I., Rotman, A. Ya, Smarov, G.P., Makovchuk, I.V., Stegnitsky, Yu.B., Nigmatulina, E.N., Khmelnikova, O.S. (2013) Regularities and mechanism of formation of the mantle lithosphere structure beneath the Siberian Craton in comparison with other cratons. Gondwana Research, 23 (1) 4-24 doi:10.1016/j.gr.2012.03.009 | Journal (article/letter/editorial) | | Lakehead University, Canada f Institute of Geology of Diamond and Noble Metals SD RAS, Yakutsk, Russia g ALROSA...lithospheric mantle which are responsible for the diamond grade. The lithospheric mantle consists of two...sheared peridotites under Udachnaya and other kimberlite pipe are likely to have formed after the intrusion...evolution of mantle at the time of intrusion of the kimberlite magmas. This new information allows us to address...geophysics and geodynamics. Locations of the Siberian kimberlite pipes were described in numerous papers (Sobolev |  | | Journal (issue) | | 515 Narragansett Park Drive, Pawtucket, RI 02861 USA • 1/8 HP / 22,000 rpm motor • Foot control and handpiece...DIAMONDS 50 Smokin’ Stones: Diamond Crystals by Sharon Elaine Thompson 52 Colorado Diamonds: A Blast from...materials by Betsy Lehndorff 54 Etched Silver and Colorado Diamond Necklace jewelry project by Betsy Lehndorff...Mouawad Campus 5345 Armada Drive Carlsbad, CA 92008 USA T +1 760 603 4000 T +1 800 421 7250 E admissions@gia...design feature such as color, texture, form, value, line, space, repetition, balance, contrast, unity, or |  | | Journal (article/letter/editorial) | | and a good read. The zinc mines and minerals, mining companies, and ore processing are covered, as are...the geology, “cultural aspects,” and local iron mining. Illustrations abound, from a drawing of bladder...Natural History, and Jorgen Langhof, director of the mining museum at L h g ban. There are short chapters on...deposit by Bengt Bollmark. Chapters on Lingban’s mining history by Langhof and Thomas Osterberg and on...Wyoming State Geologlcal Survey Report of investlgatlons 53, by W. Dan Hausel. Wyomlng State Geological |  | | Journal (article/letter/editorial) | | Crossroads, Wilkes County, Georgia. The more familiar and more highly regarded gems—emerald, diamond, sapphire...Hill, Oxford County, Maine, in 1820 among the roots of a fallen tree, leading to active mining for gem tourmaline...discovery occurred at the Dunton mine, Newry, Oxford County, in 1972, consisting of a series of pockets that...tourmaline (elbaite) from the Himalaya mine, San Diego County, California. Tino Hammid photo. =VS\TL 1HU\HY`-LIY\HY`...emerald, from the Rist mine, Hiddenite, Alexander County, North Carolina; 12.7 cm high. Houston Museum of |  | | Corporate Document | | 2012 Copper King Mine, Silver Crown District, Wyoming (Preliminary Report) W. Dan Hausel Independent...Arizona 11/14/2012 COPPER KING MINE, SILVER CROWN DISTRICT W. Dan Hausel, Independent Geologist Gilbert,... Arizona Introduction The Silver Crown district (also known as Hecla) lies 20 miles west of Cheyenne...east of Curt Gowdy State Park along the eastern flank of the Laramie Range. The district is visible on Google...and Jones, 1982). Nearly all mining and exploration activity in the district centered on the Copper King |  | | Book (volume) | | Sparks Editors Proceedings of 10th International Kimberlite Conference Volume 1 Dedicated to Roger H. Mitchell...Mitchell Proceedings of 10th International Kimberlite Conference D. Graham Pearson • Herman S. Grütter...Sparks Editors Proceedings of 10th International Kimberlite Conference Volume 1 Special Issue of the Journal...Photograph The 10th International Kimberlite Conference International Kimberlite Conferences (IKCs) are special...scientists and industrial personnel concerned with diamond exploration and exploitation, petrology, geochemistry |
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Kelsey Lake, State Line Kimberlite Mining District, Larimer County, Colorado, USA