 | | Report (issue) | | like to say), we have two seasons, “summer” and “other,” and the line between them somewhat annoyingly...be 97, a high of 75 is forecast for next Tuesday, and quite soon thereafter we’ll have triple digits. Oh...there’s plenty of action, both in the new-finds and recirculated-old-classics departments. See for yourselves:...Carsten Slotta Mineralien and a regular setter-upper at the Ste.-Marie-aux-Mines and Munich shows, has started...from the earliest days of mining at Tsumeb ($300)—and the two superb miniatures pictured here.... 1 |  | | Report (volume) | | General Geology and Phosphate Deposits 1 of Conception del Oro District, Zacatecas Mexico GEOLOGICAL...with the Institute Nacional para la Investigacion de Recursos Miner ales, under the auspices of the Technical...Department of State and the Foreign Operations Administration 1037-A General Geology and Phosphate Deposits...Mexico By CLEAVES L. ROGERS, ZOLTAN DE CSERNA, EUGENIC TAVERA, and SALVADOR ULLOA GEOLOGIC INVESTIGATIONS...with the Institute Nacional para la Investigacion de Recur sos Miner ales, under the auspices of the Technical |  | | Journal (article/letter/editorial) | | ChemicalBrecciation,an UnrecognizedMechanismfor Breccia Formation? FREDERICKJ. SAWKINS Abstract The occurrenceof...depositswere formed. Details of the occurrence and texture of the breccias associated with the Tri-State...presentlyacceptedmodesof breccia formation is adequateto explain them. The restriction of the breccia to areas of...of introduced jasperold,and the spatial relationshipsof the fragmentsbroken from chert nodulesand lenses...essentiallyprecludesexternal forces as a means of breccia formation. Brecciation is thoughtto be related |  | | Journal (article/letter/editorial) | | Solari a a b c Universidad Nacional Autónoma de México, Centro de Geociencias, Campus Juriquilla, Juriquilla... Mexico Universidad Nacional Autónoma de México, Instituto de Geología, Ciudad Universitaria, Del. Coyoacán...spectrometry) U–Pb detrital and igneous zircon data of poly-deformed metamorphic and igneous rocks of the Ayú...age data indicate that they formed in the Mesozoic and should be placed in the newly designated Ayú Complex...intrusions of granodioritic, dioritic, and granitic dikes and sheets as well as pegmatite bodies, which |  | | Journal (article/letter/editorial) | | Depositsof Northern Mexico PETERK. M. MEGAW, JOAQUINRUIZ, AND SPENCERR. TITLEY Departmentof Geosciences, Universityof...thisbelt controlmineralizationin manydistricts. Altered and/ormineralizedvolcanicand intrusiverocksof Tertiary...contacts, faults, fold axes,fractures, fissures,and cavern zones.Intrusive contactsand intrusion-related...mineralizingfluids at Naica, Concepciondel Oro, and Velardefia,but SantaEulalia and other districtsshow evidencesuggesting...silver,with approximately 10 percentcombinedlead and zinc. The remainingnine districtsdiscussed containedmorethan |  | Dill, H. G., Bosse, H.-R., Henning, K.-H., Fricke, A., Ahrendt, H. (1997) Mineralogical and chemical variations in hypogene and supergene kaolin deposits in a mobile fold belt the Central Andes of northwestern Peru. Mineralium Deposita, 32 (2) 149-163 doi:10.1007/s001260050081 | Journal (article/letter/editorial) | | Fricke H. Ahrendt Mineralogical and chemical variations in hypogene and supergene kaolin deposits in a...deposits occur in Lower Cretaceous and Tertiary clastic, volcaniclastic and volcanic, mostly rhyolitic, rocks...K /Ar ages of 11.5 ± 0.7 Ma and 13.3 ± 0.4 Ma. In addition to kaolin and alunite, the following minerals...pyrophyllite, tridymite, cristobalite, a- and bquartz, chamosite, gibbsite, and aluminum-phosphatesulphate minerals...svanbergite and florencite originate from supergene alteration. Woodhouseite, goyazite, crandallite and pure |  | | Journal (article/letter/editorial) | | 733-753 SOCIETY OF ECONOMIC GEOLOGISTS Holly Huyck and Richard Grauch SEG Newsletter Editors 5808 SouthRapp...talk. andSawkins,1974;Rye et al., 1974, 1992;Kelly and Rye, 1979). Frequently, magmaticfluids were Modelsand...alsoplaceimportant fluids after their exsolution from a magma and some constraints on their evolutionin the system...Lister, 1974, 1980; Henley and McNabb, Mountainnear Lake City, Colorado;and Providen- 1978; Burnham, 1979;...depositwill illustratea different 1991, 1992; Henley and Ellis, 1983). I am particuaspectof high-levelmagmaticfluid |  | | Report (issue) | | Geology and Mineral Deposits of the Boleo Copper District Baja California, Mexico By IVAN F. WILSON In...with the Instituto Nacional para la Investigation de Recur so s Miner ales under the auspices of the Technical...Location of the area__-_-__-------------_-------Purpose and scope of the investigation ____________ Ack nowledgments...___-__-___-_-------_ Accessibility and transportation __________________ Topography and drainage...- . ------------------Climate...Natural resources.. . ________---_--_-------_----Towns and mining camps. _ ---------------------- Page 1 2 |  | | Report (issue) | | The Emplacement of Silicic Domes and Lava Flows a RECEIVED SAKE Edited by Jonathan H. Fink Geology...This book is dedicated to Don Allen, Bob Compton, and Nina DeLange. Copyright is not claimed on any material...employment. All materials subject to this copyright and included in this volume may be photocopied for the...Cataloging-in-Publication Data The Emplacement of silicic domes and lava flows. (Special paper ; 212) “Outgrowth of a...W. Chadwick, Jr., T. J. Casadevall, J. W. Ewert, and C. C. Heliker Volcanic activity at Santiaguito volcano |  | | Report (volume) | | General de Minas y Petroleo, Secretar{a de Ia Econom[a Nacional de Mexico, and the lnstituto de Geolog(a...Autononta de Mexico, under the auspices of the Interdepartmental Committee on Scientific and Cultural...____ Location and accessibility _______________________________ -------Field work and acknowledgments...mine_________________________________________________ San Alfredo mine _______________ -_______________________________...-----------------------------------Ore reserves and future of Canoas ______________________________ :_____ |  | | Report (volume) | | the UNIVERSIDAD NACIONAL DE MEXICO, INSTITUTO DE GEOLOGIA and SECRETARIA DE LA ECONOMIA NACIONAL under...of the INTERDEPARTMENTAL COMMITTEE ON SCIENTIFIC AND CULTURAL COOPERATION, DEPARTMENT OF STATE Geologic... Location and accessibility.--------_____________________________ Topographic setting and culture_--_------...History, ownership, and production._____________________________ Methods of mining and milling__--____....ore___-_-_-____-__-___-_____.______ Influence of faults and fractures---_---_-------------_-______ Influence |  | | Report (issue) | | Durango Mexico By WARD C. SMITH, KENNETH SEGERSTROM, and REINALDO GUIZA, JR. GEOLOGICAL SURVEY BULLETIN...Autonbma de Mexico, Instituto de Geologia, and the Comite Directivo para la Investigation de los Recursos...Minerales de Mexico under the auspices of the Interdepartmental Committee on Scientific and Cultural Cooperation...______ Mining and concentrating-_________________________________________ Sampling and assaying___-_...Production statistics and estimates. _________________________________ Districts and mines examined___: |  | | Journal (article/letter/editorial) | | Universityof Missouri-Columbia, Columbia,Missouri65211 AND BRIAN J. SKINNER Departmentof Geologyand Geophysics...primarilycopper deposits,but they have associated lead, zinc, and silver mineralization. The deposits occurwithinUpperCretaceous...nevents.Fluid inclusiondatasuggest that stagesI and II each evolvedfrom initial high temperatures(near...mineralswere depositedat temperatures between350ø and 250øC from fluidswith salinitiesrangingfrom 3 to...to depthsat the time of mineralization between500 and 1,250 m. Sulfurisotopecompositions of sulfidemineralsare |  | | Journal (article/letter/editorial) | | Geology Vol. 62, 1967, pp. 861-863 DISCUSSIONS BRECCIA PIPE MINERALIZATION AT MOUNT MORGAN Sir:...the lithological association at the Mount Morgan mine suggestsanother perhaps more reasonable explanation...andesite-dacite-rhyolite association.Sulfide (pyrite and/ or pyrrhotitewith associated minor chalcopyrite...separated by later quartz with somepyrite. The breccia fragmentsare either massivepyrite, host rock with...the place to detail the geologyof the Mount Morgan mine. Sufficeto say that there are many featuresof it |  | | Journal (article/letter/editorial) | | Springer-Verlag 1996 Physicochemical conditions of deposition and origin of carbonate-hosted base metal sulfide mineralization...St., 105 62 Athens, Greece 2 Institute of Geology and Mineral Exploration (IGME), 1 Fragon St., 546 26...January 1995/Accepted: 20 March 1996 Abstract. Vein and stratabound base metal sulfide mineralization of...with amphibolites, amphibole-biotite, and biotite gneisses, and marbles. These rocks have undergone amphibolite...580 o_ 620 ~ in Upper Cretaceous to Eocene times, and were subsequently retrograded to greenschist facies |  | | Journal (article/letter/editorial) | | MINERALIZATION OF THE CANDELARIA Fe OXIDE Cu-Au DEPOSIT AND THE ORIGIN OF THE CHILEAN IRON BELT, BASED ON Re-Os...NY 13902, USA AND FERNANDO HENRÍQUEZ Departamento de Ingeniería en Minas, Universidad de Santiago, Santiago...the systematics of Re-Os isotopes at La Candelaria and a number of other deposits in the Cretaceous iron...iron belt of Chile. The data provide a new and important confirmation of the idea that the La Candelaria...magnetite-apatite deposits in the Cretaceous iron belt, and the second involves the age of mineralization at |  | | Report (issue) | | preliminary and has not been reviewed for conformity with Geological Survey editorial standards and stratigraphic...this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government...following map and descriptions contain site-specific geologic and economic data on mineral deposits and occurrences...Sonora, North Baja California, South Baja California and the northern part of Chihuahua, Mexico. The area...data was compiled from both Spanish- and English-language sources, and was entered into a microcomputer database |  | | Journal (article/letter/editorial) | | EconomicGeology Vol. 80, 1985, pp. 1544-1565 Porphyry Copper and TourmalineBrecciasat Los Bronces-Rio Blanco, Chile...HOLMGREN D., AND SERGIO BARASSIF. CompadiaDisputadade las CondesS.A,Casilla16178, Correo9, Providencia,Santiago...alteration, and coppertourmalinebrecciaswere formedover a period of at least2.5 m.y. between7.4 and 4.9 m.y...specularitc and/ortourmalinewithin the propyliticzone.The porphyrysystemcontainsdisseminated and stockwo...large contiguous kidney-shaped body about2 km long and 0.7 km wide, at the presenterosionsurface.The brecciabodycropsout |  | | Report (volume) | | DAVID GALLAGHER AND RAFAEL PEREZ SILICEO Prepared in cooperation with the SECRETARIA DE LA ECONOMIA NACIONAL...NACIONAL DE MEXICO, DIRRECrON GENERAL DE MINAS Y PETROLEO and the UN1VERSIDAD NACIONAL AUTONOMA DE MEXICO...INSTITUTO DE GEOLOGIA under the auspices of the INTERDEPARTMENTAL COMMITTEE ON SCIENTIFIC AND CULTURAL...-_____--___-_--__--____-_---_._-__.____._._______Field work and acknowledgments....-..---______________________ History...Mineralogy-_--___----_-___--__--__-_-_-.-_-_____-_-__ Mine workings.._____________-_-_-___-......_..._...__ |  | MATHUR, R., Marschik, R., Ruiz, J., Munizaga, F., Leveille, R. A., Martin, W. (2003) AGE OF MINERALIZATION OF THE CANDELARIA Fe OXIDE Cu-Au DEPOSIT ANDTHE ORIGIN OF THE CHILEAN IRON BELT, BASED ON Re-Os ISOTOPES--A REPLY. Economic Geology, 98 (5) 1050-1052 doi:10.2113/gsecongeo.98.5.1050 | Journal (article/letter/editorial) | | MINERALIZATION OF THE CANDELARIA Fe OXIDE Cu-Au DEPOSIT AND THE ORIGIN OF THE CHILEAN IRON BELT, BASED ON Re-Os...Pennsylvania 16652 ROBERT MARSCHIK, Department of Earth and Environmental Sciences, Ludwig-Maximilians University...FRANCISCO MUNIZAGA, Departamento de Geología y Geofísica, Universidad de Chile, Santiago, Chile RICHARD...Exploration Corporation, Phoenix, Arizona 85004 AND WALTER MARTIN Compañía Contractual Minera Candelaria...issues: (1) the interpretation of combined Re-Os data and field observations as an indication of a basinal |  | | Journal (article/letter/editorial) | | Ag-Pb-Zn-Cu Deposit,CentralAndes,Peru* Ro•.•r O. RYe-and F. J. SAWKINS Abstract The extensive Casapalca vein...deposits containprimarilypyrite, sphalerite,galena,and tetrahedrite,accompanied by quartzand minor calcitegangue...sulfide-sulfosalt stage (,-, 15 percentof vein filling), and (3) a postorestageof calcite deposition(< 5 percentof...crystals of sphalerit.eand quartz from both main- and late-stagerug assemblagesindicate depositionof main-stage...within the temperaturerange of ~370 ø to ~320øC and depositionof late-stageassemblageswithin th.e range |  | | Report (issue) | | Geology and Quicksilver Deposits of the New Almaden District Santa Clara County California GEOLOGICAL...Conservation, Division of .Mines and Geology PAPER 360 Geology and Quicksilver Deposits of the New...Santa Clara County California By EDGAR H. BAILEY and DONALD L. EVERHART GEOLOGICAL SURVEY PROFESSIONAL...Agency, Department of Conservation, Division of Mines and Geology UNITED STATES GOVERNMENT PRINTING OFFICE...as folle>ws: Bailey, Edgar Herbert, 1914Geology and quicksilver deposits of the New Almaden district |  | | Journal (article/letter/editorial) | | Epithermal Gold Mineralization at the La Bodega and La Mascota Deposits, Northeastern Cordillera of Colombia*...Rodríguez Madrid,1,2,† Thomas Bissig,1 Craig J.R. Hart,1 and Luis C. Mantilla Figueroa3 1 Mineral Deposit Research...Universidad Industrial de Santander, Facultad de Ingenierías Fisicoquímicas, Escuela de Geología, Carrera...Calle 9, Ciudadela Universitaria Abstract La Bodega and La Mascota are Plio-Pleistocene high- to intermediate-sulfidation...gneisses and Mesozoic granites of the Santander massif, eastern Cordillera of Colombia and are part of |  | | Book | | Minerals, Rocks and Mountains 17 Frederick J. Sawkins Metal Deposits in Relation to Plate Tectonics...Tectonics Second Edition Minerals and Rocks 17 Editor in Chief P. J. Wyllie, Pasadena, CA Editors A. EI Goresy...Deposits in Relation to Plate Tectonics Second Revised and Enlarged Edition With 246 Figures Springer-Verlag... Dr. FREDERICK J. SAWKINS Department of Geology and Geophysics University of Minnesota 108 Pillsbury...series appeared under the title Minerals. Rocks and Inorganic Materials ISBN 978-3-662-08683-4 ISBN |  | | Journal (article/letter/editorial) | | Observation and Microthermometry of Pyrite-Hosted Fluid Inclusions SHANNON E. LINDAAS,* JERZY KULIS,** AND ANDREW...Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro...transparent in infrared light to reveal fluid inclusions and other internal features. For a reconnaissance study...generally scarcer than fluid inclusions in quartz and microthermometric measurements are more difficult... about two thirds yielded salinity measurements and about one quarter yielded homogenization temperatures |
|
