An Overview of the Mineral Deposits of the Red Mountain Mining District, San Juan Mountains, Colorado D.A
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University of Oklahoma Graduate College
UNIVERSITY OF OKLAHOMA GRADUATE COLLEGE POTENTIAL FIELD STUDIES OF THE CENTRAL SAN LUIS BASIN AND SAN JUAN MOUNTAINS, COLORADO AND NEW MEXICO, AND SOUTHERN AND WESTERN AFGHANISTAN A DISSERTATION SUBMITTED TO THE GRADUATE FACULTY in partial fulfillment of the requirements for the Degree of DOCTOR OF PHILOSOPHY By BENJAMIN JOHN DRENTH Norman, Oklahoma 2009 POTENTIAL FIELD STUDIES OF THE CENTRAL SAN LUIS BASIN AND SAN JUAN MOUNTAINS, COLORADO AND NEW MEXICO, AND SOUTHERN AND WESTERN AFGHANISTAN A DISSERTATION APPROVED FOR THE CONOCOPHILLIPS SCHOOL OF GEOLOGY AND GEOPHYSICS BY _______________________________ Dr. G. Randy Keller, Chair _______________________________ Dr. V.J.S. Grauch _______________________________ Dr. Carol Finn _______________________________ Dr. R. Douglas Elmore _______________________________ Dr. Ze’ev Reches _______________________________ Dr. Carl Sondergeld © Copyright by BENJAMIN JOHN DRENTH 2009 All Rights Reserved. TABLE OF CONTENTS Introduction…………………………………………………………………………..……1 Chapter A: Geophysical Constraints on Rio Grande Rift Structure in the Central San Luis Basin, Colorado and New Mexico………………………………………………………...2 Chapter B: A Geophysical Study of the San Juan Mountains Batholith, southwestern Colorado………………………………………………………………………………….61 Chapter C: Geophysical Expression of Intrusions and Tectonic Blocks of Southern and Western Afghanistan…………………………………………………………………....110 Conclusions……………………………………………………………………………..154 iv LIST OF TABLES Chapter A: Geophysical Constraints on Rio Grande Rift Structure in the Central -
The Roots of Middle-Earth: William Morris's Influence Upon J. R. R. Tolkien
University of Tennessee, Knoxville TRACE: Tennessee Research and Creative Exchange Doctoral Dissertations Graduate School 12-2007 The Roots of Middle-Earth: William Morris's Influence upon J. R. R. Tolkien Kelvin Lee Massey University of Tennessee - Knoxville Follow this and additional works at: https://trace.tennessee.edu/utk_graddiss Part of the Literature in English, British Isles Commons Recommended Citation Massey, Kelvin Lee, "The Roots of Middle-Earth: William Morris's Influence upon J. R. R. olkien.T " PhD diss., University of Tennessee, 2007. https://trace.tennessee.edu/utk_graddiss/238 This Dissertation is brought to you for free and open access by the Graduate School at TRACE: Tennessee Research and Creative Exchange. It has been accepted for inclusion in Doctoral Dissertations by an authorized administrator of TRACE: Tennessee Research and Creative Exchange. For more information, please contact [email protected]. To the Graduate Council: I am submitting herewith a dissertation written by Kelvin Lee Massey entitled "The Roots of Middle-Earth: William Morris's Influence upon J. R. R. olkien.T " I have examined the final electronic copy of this dissertation for form and content and recommend that it be accepted in partial fulfillment of the equirr ements for the degree of Doctor of Philosophy, with a major in English. David F. Goslee, Major Professor We have read this dissertation and recommend its acceptance: Thomas Heffernan, Michael Lofaro, Robert Bast Accepted for the Council: Carolyn R. Hodges Vice Provost and Dean of the Graduate School (Original signatures are on file with official studentecor r ds.) To the Graduate Council: I am submitting herewith a dissertation written by Kelvin Lee Massey entitled “The Roots of Middle-earth: William Morris’s Influence upon J. -
Sulphur Isotope Geochemistry of the Ores and Country Rocks at the Almadcn Mercury Deposit, Ciudad Real, Spain*
Gemhimrca 0 Comochmica Acln Vol. 56, pp. 3765-3780 OOl6-7037/92/$5.00 + 00 Copyright 0 1992 PerpamonPress Ltd. Printed tn U.S.A. Sulphur isotope geochemistry of the ores and country rocks at the AlmadCn mercury deposit, Ciudad Real, Spain* FRANCIS SAUP~~and MICHEL ARNOLD Centre de Recherches Pstrographiques et GCochimiques, BP 20, 54501 Vandoeuvre-l&s-NancyCedex. France (Received June 7, 1991: accepted in revised form April 15, 1992) Abst~ct-Seventy-four new S isotope analyses of ore minerals and country rocks are given for the Hg deposit of Almad&. The spread of the cinnabar &34Sis narrow within each of the three orebodies, but the 634S average values differ sufficiently between them (mean 634S: San Nicolas = 0.2 rt I. l%, San Francisco = 8.1 + 0.7%0, San Pedro = 5.9 f 1.0%0) to indicate three different mineralization episodes and possibly processes. The unweighted mean for all cinnabar samples is 5.6%0 and the S source is considered to be the host-rocks, either the Footwall Shales (634S = 5.5%0) or the spilites (S34S = 5.1 rt 1.3%0). For geometric and chronologic reasons, the former seem the best potential source. However, the high ?js4S values of the San Francisco cinnabar cannot be explained without addition of heavy S from reduction of seawater sulphate. Orderly distributions ofthe 634Svalues are observed in all three orebodies: ( 1) their increase from the stratigraphic bottom to the top in the San Pedro orebody is explained by a Rayleigh process, and (2) the maxima in the centres of the San Francisco and San Nicolas orebodies are explained by mixing of the S transporting hydrothermal fluids with seawater within the sediments. -
Denudation History and Internal Structure of the Front Range and Wet Mountains, Colorado, Based on Apatite-Fission-Track Thermoc
NEW MEXICO BUREAU OF GEOLOGY & MINERAL RESOURCES, BULLETIN 160, 2004 41 Denudation history and internal structure of the Front Range and Wet Mountains, Colorado, based on apatitefissiontrack thermochronology 1 2 1Department of Earth and Environmental Science, New Mexico Institute of Mining and Technology, Socorro, NM 87801Shari A. Kelley and Charles E. Chapin 2New Mexico Bureau of Geology and Mineral Resources, New Mexico Institute of Mining and Technology, Socorro, NM 87801 Abstract An apatite fissiontrack (AFT) partial annealing zone (PAZ) that developed during Late Cretaceous time provides a structural datum for addressing questions concerning the timing and magnitude of denudation, as well as the structural style of Laramide deformation, in the Front Range and Wet Mountains of Colorado. AFT cooling ages are also used to estimate the magnitude and sense of dis placement across faults and to differentiate between exhumation and faultgenerated topography. AFT ages at low elevationX along the eastern margin of the southern Front Range between Golden and Colorado Springs are from 100 to 270 Ma, and the mean track lengths are short (10–12.5 µm). Old AFT ages (> 100 Ma) are also found along the western margin of the Front Range along the Elkhorn thrust fault. In contrast AFT ages of 45–75 Ma and relatively long mean track lengths (12.5–14 µm) are common in the interior of the range. The AFT ages generally decrease across northwesttrending faults toward the center of the range. The base of a fossil PAZ, which separates AFT cooling ages of 45– 70 Ma at low elevations from AFT ages > 100 Ma at higher elevations, is exposed on the south side of Pikes Peak, on Mt. -
Robinson Mine Plan of Operations Amendment Draft Environmental Impact Statement DOI-BLM-NV-L060-2020-0008-EIS
Robinson Mine Plan of Operations Amendment Draft Environmental Impact Statement DOI-BLM-NV-L060-2020-0008-EIS U.S. Department of the Interior Estimated Cost to Prepare this Bureau of Land Management Draft Environmental Impact Statement Bristlecone Field Office Bureau of Land Management (Cost Recovery): 702 North Industrial Way $224,000.00 Ely, Nevada 89301-9408 Proponent: $1,016,000.00 December 2020 United States Department of the Interior BUREAU OF LAND MANAGEMENT Ely District Office 702 North Industrial Way Ely, Nevada 89301 https://www.blm.gov/nevada In Reply Refer To: 3809 (NVL0600) NVN-68654 December 2020 Dear Reader: Attached for your review and comment is the Robinson Mine Plan of Operations Amendment Draft Environmental Impact Statement (draft EIS) prepared by the Bureau of Land Management (BLM) Ely District, Bristlecone Field Office. The BLM prepared this document to provide an objective analysis of the Proposed Action and alternatives based on the best available science and thus to inform a BLM decision about whether or not to approve a proposed amendment to the Plan of Operations for the Robinson Project (Mine Plan) as submitted to the BLM by the KGHM Robinson Nevada Mining Company (hereafter KGHM Robinson). This EIS was developed in accordance with the National Environmental Policy Act of 1969 (NEPA), the Federal Land Policy and Management Act of 1976, implementing regulations, BLM’s NEPA Handbook (H-1790-1), and other applicable laws and policy. Because the notice of intent for this EIS was issued before September 14, 2020, the BLM developed this EIS in accordance with the 1978, as amended, Council on Environmental Quality (CEQ) regulations for implementing NEPA (40 Code of Federal Regulations 1500–1508 from 1978, as amended in 1986 and 2006). -
Historical Range of Variability and Current Landscape Condition Analysis: South Central Highlands Section, Southwestern Colorado & Northwestern New Mexico
Historical Range of Variability and Current Landscape Condition Analysis: South Central Highlands Section, Southwestern Colorado & Northwestern New Mexico William H. Romme, M. Lisa Floyd, David Hanna with contributions by Elisabeth J. Bartlett, Michele Crist, Dan Green, Henri D. Grissino-Mayer, J. Page Lindsey, Kevin McGarigal, & Jeffery S.Redders Produced by the Colorado Forest Restoration Institute at Colorado State University, and Region 2 of the U.S. Forest Service May 12, 2009 Table of Contents EXECUTIVE SUMMARY … p 5 AUTHORS’ AFFILIATIONS … p 16 ACKNOWLEDGEMENTS … p 16 CHAPTER I. INTRODUCTION A. Objectives and Organization of This Report … p 17 B. Overview of Physical Geography and Vegetation … p 19 C. Climate Variability in Space and Time … p 21 1. Geographic Patterns in Climate 2. Long-Term Variability in Climate D. Reference Conditions: Concept and Application … p 25 1. Historical Range of Variability (HRV) Concept 2. The Reference Period for this Analysis 3. Human Residents and Influences during the Reference Period E. Overview of Integrated Ecosystem Management … p 30 F. Literature Cited … p 34 CHAPTER II. PONDEROSA PINE FORESTS A. Vegetation Structure and Composition … p 39 B. Reference Conditions … p 40 1. Reference Period Fire Regimes 2. Other agents of disturbance 3. Pre-1870 stand structures C. Legacies of Euro-American Settlement and Current Conditions … p 67 1. Logging (“High-Grading”) in the Late 1800s and Early 1900s 2. Excessive Livestock Grazing in the Late 1800s and Early 1900s 3. Fire Exclusion Since the Late 1800s 4. Interactions: Logging, Grazing, Fire, Climate, and the Forests of Today D. Summary … p 83 E. Literature Cited … p 84 CHAPTER III. -
Wayne P. Barnett Principal Consultant
Resume Wayne P. Barnett Principal Consultant Profession Principal Structural Geologist Education Doctor of Philosophy in the School of Geological Sciences, University of KwaZulu-Natal, South Africa, 2007 Master of Science in Structural/Engineering Geology, University of Cape Town, South Africa, 1997 Certificate in Rock Mechanics, Chamber of Mines of South Africa, 2002. Bachelor of Science with Honours in Geology, University of Cape Town, 1995 Registrations/ Professional Geologist (APEGBC #43273), Professional Affiliations Natural Scientist (SACNASP #400237/04) Specialisation Structural Geology; Kimberlite Geology; Engineering Geology; 3D Computer-based Geological Modelling and GIS. Expertise Wayne is a Principal Consultant with 24 years of experience in the mining and exploration industry. He has been employed over a period of eight years as a mining operations-based geotechnical engineer and applied structural geologist. Subsequently, Wayne has performed the role of consulting structural geology specialist in mining and exploration in Africa, North America, South America and Asia. Consequently he specialises in defining the structural geology of mining projects in order to properly characterize the rock mass for geotechnical engineering applications - for scoping to pre-feasibility studies, as well as problem-solving in active mining operations. Wayne is a geological modelling expert and undertakes and provides training in structural and geotechnical drill core logging, open pit and underground mapping, geological data management, data QA/QC, and statistical analysis of structural data. He has provided formal applied structural geology training to over 1000 geologists and engineers internationally. These versatile skills have also allowed him to provide practical, goal-focussed structural consulting in diamond, precious and base metal exploration and resource characterization on numerous projects and active operations on all major mining-active continents; for understanding controls on mineralization and targeting purposes. -
Colorado Fourteeners Checklist
Colorado Fourteeners Checklist Rank Mountain Peak Mountain Range Elevation Date Climbed 1 Mount Elbert Sawatch Range 14,440 ft 2 Mount Massive Sawatch Range 14,428 ft 3 Mount Harvard Sawatch Range 14,421 ft 4 Blanca Peak Sangre de Cristo Range 14,351 ft 5 La Plata Peak Sawatch Range 14,343 ft 6 Uncompahgre Peak San Juan Mountains 14,321 ft 7 Crestone Peak Sangre de Cristo Range 14,300 ft 8 Mount Lincoln Mosquito Range 14,293 ft 9 Castle Peak Elk Mountains 14,279 ft 10 Grays Peak Front Range 14,278 ft 11 Mount Antero Sawatch Range 14,276 ft 12 Torreys Peak Front Range 14,275 ft 13 Quandary Peak Mosquito Range 14,271 ft 14 Mount Evans Front Range 14,271 ft 15 Longs Peak Front Range 14,259 ft 16 Mount Wilson San Miguel Mountains 14,252 ft 17 Mount Shavano Sawatch Range 14,231 ft 18 Mount Princeton Sawatch Range 14,204 ft 19 Mount Belford Sawatch Range 14,203 ft 20 Crestone Needle Sangre de Cristo Range 14,203 ft 21 Mount Yale Sawatch Range 14,200 ft 22 Mount Bross Mosquito Range 14,178 ft 23 Kit Carson Mountain Sangre de Cristo Range 14,171 ft 24 Maroon Peak Elk Mountains 14,163 ft 25 Tabeguache Peak Sawatch Range 14,162 ft 26 Mount Oxford Collegiate Peaks 14,160 ft 27 Mount Sneffels Sneffels Range 14,158 ft 28 Mount Democrat Mosquito Range 14,155 ft 29 Capitol Peak Elk Mountains 14,137 ft 30 Pikes Peak Front Range 14,115 ft 31 Snowmass Mountain Elk Mountains 14,099 ft 32 Windom Peak Needle Mountains 14,093 ft 33 Mount Eolus San Juan Mountains 14,090 ft 34 Challenger Point Sangre de Cristo Range 14,087 ft 35 Mount Columbia Sawatch Range -
Late Pleistocene Glacial Equilibrium-Line Altitudes in the Colorado Front Range: a Comparison of Methods
QUATERNARY RESEARCH l&289-310 (1982) Late Pleistocene Glacial Equilibrium-Line Altitudes in the Colorado Front Range: A Comparison of Methods THOMAS C. MEIERDING Department of Geography and Center For Climatic Research, University of Delaware, Newark, Delaware 19711 Received July 6, 1982 Six methods for approximating late Pleistocene (Pinedale) equilibrium-line altitudes (ELAs) are compared for rapidity of data collection and error (RMSE) from first-order trend surfaces, using the Colorado Front Range. Trend surfaces computed from rapidly applied techniques, such as glacia- tion threshold, median altitude of small reconstructed glaciers, and altitude of lowest cirque floors have relatively high RMSEs @I- 186 m) because they are subjectively derived and are based on small glaciers sensitive to microclimatic variability. Surfaces computed for accumulation-area ratios (AARs) and toe-to-headwall altitude ratios (THARs) of large reconstructed glaciers show that an AAR of 0.65 and a THAR of 0.40 have the lowest RMSEs (about 80 m) and provide the same mean ELA estimate (about 3160 m) as that of the more subjectively derived maximum altitudes of Pinedale lateral moraines (RMSE = 149 m). Second-order trend surfaces demonstrate low ELAs in the latitudinal center of the Front Range, perhaps due to higher winter accumulation there. The mountains do not presently reach the ELA for large glaciers, and small Front Range cirque glaciers are not comparable to small glaciers existing during Pinedale time. Therefore, Pleistocene ELA depression and consequent temperature depression cannot reliably be ascertained from the calcu- lated ELA surfaces. INTRODUCTION existed in alpine regions (Charlesworth, Glacial equilibrium-line altitudes (ELAs) 1957; ostrem, 1966; Flint, 1971; Andrews, have been widely used to infer present and 1975). -
Geochronology Database for Central Colorado
Geochronology Database for Central Colorado Data Series 489 U.S. Department of the Interior U.S. Geological Survey Geochronology Database for Central Colorado By T.L. Klein, K.V. Evans, and E.H. DeWitt Data Series 489 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Marcia K. McNutt, Director U.S. Geological Survey, Reston, Virginia: 2010 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod To order this and other USGS information products, visit http://store.usgs.gov Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation: T.L. Klein, K.V. Evans, and E.H. DeWitt, 2009, Geochronology database for central Colorado: U.S. Geological Survey Data Series 489, 13 p. iii Contents Abstract ...........................................................................................................................................................1 Introduction.....................................................................................................................................................1 -
Profiles of Colorado Roadless Areas
PROFILES OF COLORADO ROADLESS AREAS Prepared by the USDA Forest Service, Rocky Mountain Region July 23, 2008 INTENTIONALLY LEFT BLANK 2 3 TABLE OF CONTENTS ARAPAHO-ROOSEVELT NATIONAL FOREST ......................................................................................................10 Bard Creek (23,000 acres) .......................................................................................................................................10 Byers Peak (10,200 acres)........................................................................................................................................12 Cache la Poudre Adjacent Area (3,200 acres)..........................................................................................................13 Cherokee Park (7,600 acres) ....................................................................................................................................14 Comanche Peak Adjacent Areas A - H (45,200 acres).............................................................................................15 Copper Mountain (13,500 acres) .............................................................................................................................19 Crosier Mountain (7,200 acres) ...............................................................................................................................20 Gold Run (6,600 acres) ............................................................................................................................................21 -
Kimberlite Wall Rock Fragmentation Processes: Venetia K08 Pipe Development
1 Kimberlite Wall Rock Fragmentation Processes: Venetia K08 Pipe Development The final publication is available at www.springerlink.com - 10.1007/s00445-011-0499-3 W.P. Barnett (1,2) , S. Kurszlaukis (3), M. Tait (1), P. Dirks (4) (1) Mineral Resources Management, De Beers Group Services, P/Bag X01, Southdale 2135, South Africa (2) present address: SRK Consulting, Suite 2200, 1066 West Hastings Street, Vancouver V6E3X2, BC, Canada ([email protected]; +17782388038) (3) Kimberlite Petrology Unit, De Beers Canada Inc., Toronto, Ontario, Canada (4) School of Earth and Environmental Sciences, James Cook University, Townsville, Australia Abstract Current kimberlite pipe development models strongly advocate a downward growth process with the pipe cutting down onto its feeder dyke by means of volcanic explosions. Evidence is presented from the K08 kimberlite pipe in Venetia Mine, South Africa, which suggests that some pipes or sub-components of pipes develop upwards. The K08 pipe in pit exposure comprises >90 vol.% chaotic mega-breccia of country rock clasts (gneiss and schist) and <10 vol.% coherent kimberlite. Sub-horizontal breccia layers, tens of metres thick, are defined by lithic clast size variations, and contain zones of shearing and secondary fragmentation. Textural studies of the breccias and fractal statistics on clast size distributions are used to characterize sheared and non-sheared breccia zones, and to deduce a fragmentation mechanism. Breccia statistics are compared directly with the statistics of fragmented rock produced from mining processes in order to support interpretations. Results are consistent with an initial stage of brecciation formed by upward-moving collapse of an explosively pre-conditioned hangingwall into a subterranean volcanic excavation.