DOCSLIB.ORG

K-Ar Age Relations of Granodiorite Emplacement and Tungsten And

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
K-Ar Age Relations of Granodiorite Emplacement and Tungsten And Economic Geology Vol. 69, 1974, pp. 646-656 K-Ar Age Relationsof GranodioriteEmplacement and Tungstenand Gold Mineralizationnear the Getchell Mine, Humboldt County, Nevada* MILES L. SILBERMAN,BYRON R. BERGER,AND RANDOLPHA. KOSKI Abstract A granodiorite stock intrudes complexly folded and thrust-faulted Paleozoic sedi- mentary rocks in the OsgoodMountains of eastern Humboldt County, Nevada. Within the metamorphicaureole surroundingthe pluton, the sedimentaryrocks are converted to cordierite hornfels and marble; tungsten-bearingtactites developedalong the con- tacts of the granodiorite. Cutting the granodiorite and sedimentary rocks is the Getchell fault, along which the disseminatedgold ore bodiesof the Getchell mine are localized. K-Ar ages of the granodiorite,andesite porphyry, tungsten-bearing tactites, and altered granodioritefrom the Getchellmine indicate that emplacement,alteration, and mineralizationare all part of a magmatic-thermalepisode which took place ap- proximately 90 m.y. ago. Introduction (1966) .tentatigelysuggested a similar conclusion THE Getchellgold depositin Humboldt County is basedon his studyof the patternsof distributionof one of a group of disseminatedgold deposits•of heavyminerals and gold within the stock. Nevada. Other ore depositsof this type include Geologic Setting Carlin, Cortez, and Gold Acres (Roberts et al., The Getchellmine lies at the northeasternmargin 1971). Structural and geochemicalsettings are dis- of the OsgoodMountains. The geologyof the Os- tinctive, but the depositsshow some general simi- good Mountainsquadrangle, which coversthe north larities: the presenceof a fractured,permeable zone part of the Osgood Mountains and includes the prior to ore deposition,deposition of silica replacing Getchellmine, was describedby Hobbs (1948) and limestonewith the introductionof gold, the presence Hotz and Willden (1964). The Getchellore de- of carbonaceousmaterial in some of the ores, the posit was describedby Joralemon(1951). The predominanceof very fine-grainedto submicroscopicgeologic setting is summarizedby Hotz and Willden gold particlesin the ore, and high gold-silverratios (Fig. 1). (Roberts et al., 1971; Wells et al., 1969; Radtke The northern Osgood Mountains consistof com- and Scheiner, 1970; Hausen and Kerr, 1968). plexlyfolded and thrust-faulted Paleoz.oic sedimentary Altered igneous rocks occur within the ore zones rocks intruded by a Cretaceousgranodiorite stock. of all the disseminatedgold deposits. The impor- The stockhas two lobes,a northern and a southern, tanceof factorscontrolling ore depositionapparently joined by a thin septurn;aeromagnetic data (B. R. variedfrom depositto deposit(Roberts et al., 1971). Berger, unpub. data) substantiatethe hour-glass Although several K-Ar ages have been reported shape. The sedimentaryrocks intrudedare prin- from ore zonesof disseminatedgold depositsat Gold cipally argillites and limestoneof the Prcble forma- Acres (Silberman and McKee, 197'1) and Cortez tion of Cambrianage. Thoughnot apparentin out- (Wells et al., 1971) ages are not yet conclusively crop, the aeromagneticdata suggestthat the stock known for any of thesedeposits, and only spatialre- has steeplimbs dippingoutward on both east and lations have been demonstrated between these ore west flanks. depositsand nearby igneousrocks. Dacite porphyrydikes cut the Paleozoicsedimen- This paperreports several ages on sericiteand K- tary rocks and are probably related geneticallyto feldsparfrom the altered igneousrock at the Getchell the stock. In the northernpart of the OsgoodMoun- ore depositand showshow theseages supportthe tains,andesite porphyry dikes cut both sedimentary geneticassociation of the stockand Au depositsug- rocks and the granodiorite. Andesite dikes cut the gestedby earlier workersand documentedwith geo- sedimentaryrocks at the Getchellmine. They are chemicaldata by Ericksonet al. (1964). Neuerburg highlysheared and hydrothermallyaltered in under- * Publication authorizedby the Director, U.S. Geological ground workings and in the North Pit of the Get- Survey. chell mine. As the dikes follow the trend of the 646 K-,4RAGE RELATIONS AND TUNGSTEN .dND GOLD MINERALIZATION 647 117o20' 117Ol5' 41Ol5' EXPLANATION Alluvium UNCONFORMITY Oliwne basalt UNCONFORM ITY Docile Grono- oo porphyry diorite Sedimentary rocks Battle Formation Gaughs Canyon Formation UNCONFORMITY Volmy Comus Formation Formation 41ø I0' Harmony' Farmallon Prohie Formation K-AR Mine (MB-35) Sample Iocollly Thrust foull Foull Dashed where approximately Dashed where approximately located. Sawteeth on /ocafed; dotted where upper p/o/e. concealed; queried where doubtful or t'nferred I Mile I 41o07'18" FIG.1. Geologicmap of thenorthern part of theOsgood Mountains, modified from Hotz and Willden (1964, pl. 1). fault zone or occupyportions of it, their original tic with the granodiorite.The ageof theseandesitic positionappears to havebeen controlled by an early dikes is critical becauseveins of gold-bearingma- fracturethat later developedinto the Getcheilfault terial cut them at the Getcheil mine. zone. Granodioritedikes also parallel the fault zone. The granodioritestock has a conspicuousmeta- There is somedisagreement over the age of the morphicaureole as muchas 10,000feet wide. The andesiteporphyry dikes. Joralemon(1951) sug- shales of the Preble formation are transformed to gestedthat the dikesare an earlyphase of Tertiary biotite-,andalusite-, and cordierite-bearinghornfels; volcanism;Hobbs (1948) suggestedthat they are a the limestonesto marble, light-coloredcalc-silicate later phaseof the sameLate Cretaceousigneous rock, and dark-coloredtactite composedof garnet, activitythat producedthe granodioritestock; Hotz pyroxene,and other calcium-bearing silicates, along and Willden (1964) suggestedthat they are cogene- with minor scheelite. Thirteen tungsten mines 648 M. L. SILBERMAN,B. R. BERGER,AND R. A. KOSKI pyrite is the most common. At someplaces, schee- lite is found in calc-silicaterock and altered grano- diorite. At others,scheelite occupies narrow seams and/or small intenselyaltered areas or pocketsin the granodiorite along the contacts. These small, but very rich .ore pocketsconsist of muscovite,hy- drobiotite,small quartz crystals,and scheelite.Schee- lite-bearingquartz veins are found cutting the gold ores at both the Getcheil and Ogee-Pinson mines. A major structuralfeature of the OsgoodMoun- tains is the Getcheil fault along the eastern margin of the range (Fig. 1). Horizontal mullions and slickensideswith superimposedvertical striae show that fault movementwas largely parallel to the strike prior to the block faulting (Hobbs, 1948). Jorale- mon (1951) indicatesthat the latest movementwas vertical. Evidence at the Getchell mine of post- mineralization movement on the Getcheil fault is the displacementof Quaternary alluvium and develop- EXPLANATION ment of slickensides on the surfaces of altered rock. Rhyohtetuff The Getchell Gold Deposits ":•::'':" ).- The disseminatedgold deposit is localizedalong Ande$•tePOrl•hyry the Getcheilfault. In the southernand central parts of the mine area, granodioriteforms the walls of the GrOnOd•Orite fault zone,whereas farther north the fault cuts argil- lite and limestoneof the Preble formation (Jorale- LlrneslOne mon, 1951; Hotz and Willden, 1964). In the center pit, barren granodioriteforms the hangingwall. In Ar(:jiIhte or h0rnfele the South Extension Pit, gran.odioritein the foot- wall is partly altered (sericiticalteration) and veined by calciteand dolomite; it containssulfides and ap- proximatelyeight ppm gold. Both oxide and sulfide K-AR $ornple Iocohty gold depositsoccur. The oxide ore, being easily recovered,was exploitedduring early miningopera- 0 500 1000 FEET I I tions. The sulfide ores, which are more extensive, / were mined later. Exten$,onPfl' Joralemon(1951, p. 270) reportedthat the gold A A' ore bodiesare sheetlikemasses that lie alongvarious strandsof the Getcheilfault zone (Fig. 2). These massesconsist of shearedand mineralized argillite and limestonecut by quartz and calciteand dolomite veins; within the fault zone, the rocks contain a soft, Section 4 carbon-bearinggouge (gumbo)--minute quartzcrys- FIG. 2. Geology of the Getcheil mine area, modified from tals embeddedin a nearly submi.croscopicinter- Hotz and Willden (1964, P1. 11). growth of quartz and amorphouscarbon. The gumbo formed in the gouge zone by hydrothermal meta- located around the periphery of the stock in the morphismof carbonaceouslimestone and shale ac- tactite zone produceda total of 1,344,150tons of companiedby the introductionof fine-grainedquartz. scheelite-bearingore (Hotz and Willden, 1964). It was a major bearerof oxide gold ore. The sul- The ore is mainlyscheelite-bearing tactitc; powel- fide ores consist of carbonaceous limestone with iron lite is accessoryand metallicsulfides are presentin and arsenic sulfides. minor amounts. Uncommon small local concentra- The arsenic sulfides, realgar and orpiment, are tionsof molybdeniteare observed in tactiteclose to the associatedwith gold in the vicinity of the Getcheil granodioritecontact. Pyrite, chalcopyrite,sphalerite, mine. Accordingto Joralemon(1951), they are the andgalena are erraticallydistributed in the tactite; most abundantmetallic minerals and are primarily K-AR AGE RELATIONS AND TUNGSTEN AND GOLD MINERALIZATION 649 restricted to the areas within the veins that contain itc porphyry as early or middle Tertiary. He sug- notablequantities of gold. .The gold ore containsa gested,on the basis of the early work of Ferguson
Load more

Recommended publications
  • Public Trust: Application of the Public Trust Doctrine to Groundwater Resources
    TRUSTING THE PUBLIC TRUST: APPLICATION OF THE PUBLIC TRUST DOCTRINE TO GROUNDWATER RESOURCES Jack Tuholske∗ TABLE OF CONTENTS Introduction ...................................................................................................190 I. An Overview of Groundwater Problems in the United States...............193 A. Running Low in the High Plains .....................................................193 B. A Garden in the Wilderness.............................................................195 C. Land Subsidence...............................................................................197 D. Natural Resource Extraction............................................................198 E. Bottled Water: Groundwater as a Consumer Commodity .............200 F. Saltwater Intrusion: The Sea Cometh..............................................201 G. Reduced Surface Flows ...................................................................202 H. Groundwater Depletion: A Pervasive Nationwide Problem .........203 II. A Brief Overview of Groundwater Law ................................................204 A. Common Law Applied to Groundwater .........................................205 B. Statutory Overlays............................................................................211 III. The Public Trust and Groundwater.......................................................214 A. Brief Historical Overview of the Public Trust Doctrine................214 B. New Applications of the Public Trust Doctrine .............................216 IV. Groundwater
    [Show full text]
  • Nevada Gold Mines - Cortez Mine
    CASE STUDY Vigilante Air Quality Station™ Return safely and quicker to the face. Vigilante AQS™ Case Study at Nevada Gold Mines - Cortez Mine stations, to measure environmental conditions in real-time for worker health and safety and to reduce the total installed infrastructure costs. Nevada Gold Mines is a joint venture between Barrick (61.5%) and Newmont CorPoration (38.5%), creating the single largest gold-Producing comPlex in the world. The mining oPeration comPrises eight mines along with their associated infrastructure and Processing facilities. Nevada Gold Mines is oPerated by Barrick. Cortez Gold Mine is a located aPProximately 75 miles (120 km) southwest of Elko, Nevada, USA. The Cortez Hills Underground Mine (CHUG) is fully The Challenge mechanized, with large scale equiPment using a combination of cut and fill mining with cemented Underground mines have challenging backfill and Primary and secondary longhole environmental conditions, including toxic gases stoPing with cemented and uncemented backfill. from blasting, oPerating vehicles and/or gases given off by the surrounding strata rock. At greater Identifying the mining industry’s demand for real- dePths, the air is denser and continues to Pick uP time data to monitor and control air quality, Maestro heat from the exposed rock causing worker heat Digital Mine worked with CorteZ Mine to address stress concerns. the challenges associated with working in the harsh underground mining environment by protecting Nevada Gold Mines goal is to make its oPerations miners from acute or chronic gas related health as safe and efficient as Possible, at the lowest conditions. Nevada Gold Mines integrated Maestro Possible cost.
    [Show full text]
  • Newmont Mining Corporation Reduction of Conflict in The
    Draft Final Report to Newmont Mining Corporation Reduction of Conflict in the Extractive Industries Using Good Neighbor Agreements by Alexandra Masaitis Glenn C. Miller Department of Natural Resources and Environmental Science University of Nevada, Reno August, 2015 i Glenn C. Miller Alexandra Masaitis Reduction of conflicts in the extractive industries using Good Neighbor Agreements Abstract Conflicts between mining companies and communities are now prevalent in many countries of the world, both developed and developing. These conflicts have often resulted in delays of mine project development as well as adverse effects to the communities. Reduction of those conflicts has been shown to be best accomplished by good communication, transparency, and a willingness of each of the parties to both understand the positions of other participants, but also a willingness to compromise. One of the types of agreements that have shown success is termed a “Good Neighbor Agreement” (GNA). The needs for this project are to create an open dialog between the mining company and all interested parties who may have concerns regarding the social or environmental impacts from the mine, to minimize the possible conflicts and disagreements, and create the negotiation tools, which can be implemented any time, depending on the needs. In this case, an agreement is negotiated where good communication and frequent meetings are utilized, and the resulting agreement has sufficient penalties that if any of the signatories to the agreement fail to abide by that agreement, those penalties will be imposed. This process is often complicated, but ultimately has the potential to reduce threats of appeals or legal action, but at the same time may require elimination of certain practices.
    [Show full text]
  • Number 72 Spring 2016
    Number 72 Spring 2016 An organization of retirees of the Geologic Division, U.S. Geological Survey, who seek to keep in touch with each other and with their former Agency. Officers National Officers President John Keith 703-435-1147 Vice President John Aaron 703-437-4001 Secretary/Treasurer Odette B. James 703-476-9738 Regional Officers East Jim McNeal 703-476-0025 Central John S. Stuckless 303-236-7847 Katherine L. Varnes 303-237-2639 West Pat Muffler 650-493-6439 Newsletter Editor Bill Outerbridge 703-860-8537 Deputy Assistant Editor Kathleen Gohn 703-620-3368 Production Dave Newman 540-212-3281 Directory Coordinator Odette James 703-476-9738 References Bob Tilling [email protected] Address Geologic Division Retirees U.S. Geological Survey 953 National Center Reston, VA 20192 Email Address [email protected] About the Cover: Sampling trip into the Sierra Agua Verde, Sonora, Mexico, February 20, 1983. Left to right: Juan Manuel Morales-Ramirez, Anita Harris, Bruce Wardlaw, Jack Stewart, and Barney Poole. Before his recent death, Bruce told John Keith that each person collected about 20 kilos of rock, and the hike out was a very long one. Anita was lagging behind, and Bruce dropped back to check on her. She said, “I just can’t make it with my samples—can you put them in your pack and not tell the others?” So Bruce hauled 40 kilos for the rest of the trip. (Photo by Barney P. with camera on timer) From the President Treasurer’s Report and Membership Statistics Many of you are familiar with the American Geosciences (formerly Geologic) Institute.
    [Show full text]
  • Golden Rules Making the Case for Responsible Mining
    GOLDEN RULES Making the case for responsible mining A REPORT BY EARTHWORKS AND OXFAM AMERICA Contents Introduction: The Golden Rules 2 Grasberg Mine, Indonesia 5 Yanacocha Mine, Peru, and Cortez Mine, Nevada 7 BHP Billiton Iron Ore Mines, Australia 9 Hemlo Camp Mines, Canada 10 Mongbwalu Mine, the Democratic Republic of Congo 13 Rosia Montana Mine, Romania 15 Marcopper Mine, the Philippines, and Minahasa Raya and Batu Hijau Mines, Indonesia 17 Porgera Gold Mine, Papua New Guinea 18 Junín Mine, Ecuador 21 Akyem Mine, Ghana 22 Pebble Mine, Alaska 23 Zortman-Landusky Mine, Montana 25 Bogoso/Prestea Mine, Ghana 26 Jerritt Canyon Mine, Nevada 27 Summitville Mine, Colorado 29 Following the rules: An agenda for action 30 Notes 31 Cover: Sadiola Gold Mine, Mali | Brett Eloff/Oxfam America Copyright © EARTHWORKS, Oxfam America, 2007. Reproduction is permitted for educational or noncommercial purposes, provided credit is given to EARTHWORKS and Oxfam America. Around the world, large-scale metals mining takes an enormous toll on the health of the environment and communities. Gold mining, in particular, is one of the dirtiest industries in the world. Massive open-pit mines, some measuring as much as two miles (3.2 kilometers) across, generate staggering quantities of waste—an average of 76 tons for every ounce of gold.1 In the US, metals mining is the leading contributor of toxic emissions to the environment.2 And in countries such as Ghana, Romania, and the Philippines, mining has also been associated with human rights violations, the displacement of people from their homes, and the disruption of traditional livelihoods.
    [Show full text]
  • Characterization of Mine Leachates and the Development of a Ground-Water Monitoring Strategy for Mine Sites
    United States Office of Research and EPA/600/SR-99/007 Environmental Protection Development February 1999 Agency Washington, D.C. 20460 Project Summary Characterization of Mine Leachates and the Development of a Ground-Water Monitoring Strategy for Mine Sites Russell H. Plumb Jr. The total number of active and effective ground-water monitoring inactive mining sites in the United strategy: States has been estimated to be as high as 82,000. The 20,000 active mining 1. The composition and environ- sites currently process an estimated 1.5 mental behavior of mine waste billion tons of ore per year and the leachates is poorly understood. cumulative quantity of mine waste that has been produced has been estimated 2. The problem of how to effectively to be 50 billion tons. These wastes are sample the large areas covered by usually discarded in waste piles, tailings tailings ponds, that range in size basins, and depleted heap leaching from several acres to several pads. Although the adverse thousand acres, has never been environmental impacts of mine waste addressed. leachates and acid mine drainage on surface waters have been widely 3. The parameters that should be documented, the impact of mine monitored in ground water leachates on ground water is poorly adjacent to mine waste disposal understood. One of the factors that sites to detect fugitive mine waste contributes to this situation is the fact leachate have not been selected that the United States does not have a and evaluated. national strategy for monitoring of mining sites. The objective of this research project was to develop a better understanding When the Resource, Conservation, of the composition of mine waste and Recovery Act (RCRA) program was leachates and to identify cost effective initially developed, seventeen industries ground-water monitoring parameters were classified as generators of non- that could be incorporated into a hazardous wastes and exempted from monitoring strategy to reliably detect the the ground-water monitoring migration of contaminants from hard requirements.
    [Show full text]
  • Geochemical Reconnaissance of the Cortez-Buckhorn Area, X Southern Cortez Mountains, -V Nevada
    - Geochemical Reconnaissance of the Cortez-Buckhorn Area, x Southern Cortez Mountains, -v Nevada By JOHN D. WELLS and JAMES E. ELLIOTT , CONTRIBUTIONS TO ECONOMIC GEOLOGY \ _____________________________ GEOLOGICAL SURVEY BULLETIN 1312-P * Geochemical data show the distribution of gold, silver, mercury, arsenic, antimony, copper, zinc, molybdenum, and tellurium in carbonate and siliceous sedimentary rocks - and granitic and basaltic igneous rocks UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1971 -A, UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY William T. Pecora, Director Library of Congress catalog-card No. 79-609840 For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 2040 CONTENTS Pago Abstract._________-_-_---____-_-_-----__-- PI Introduction. ______._.__.._._._.__-.__-.__- 2 Previous geochemical and geologic work... 2 Acknowledgments. _____.____-___-.___-. 2 General geology.___._._._-..-_-_._.-_.. 4 Ore deposits.________________---_-_-_-_ 5 Current geochemical work.__________________ 6 Geochemical anomalies.______-----_-_-_-_._ 7 Geochemical maps-__--_--_-_---------_-_-- 8 Summary of geochemical anomalies.__-_-__-_- 14 Summary of geologic associations.._.__.-_-_._ 15 Geochemical anomalies and exploration targets. 16 References cited._______--____-____-_-_--_- 17 ILLUSTRATIONS [Plates are in pocket] PLATE 1. Generalized geologic map and geochemical map showing dis­ tribution of silver, Cortez-Buckhorn area, Lander and Eure­ ka Counties, Nevada. 2. Geochemical maps showing distribution of gold, mercury, ar­ senic, and antimony, Cortez-Buckhorn area, Lander and Eureka Counties, Nevada.
    [Show full text]
  • For Personal Use Only Use Personal For
    Dear Shareholder, Level 2, 35 Outram Street West Perth WA 6005 As announced on 26 April 2016, Great Western Exploration Limited (“the Company” or “GTE”) made an all script offer for unlisted public company Vanguard Exploration Limited (“Vanguard”). The offer to acquire 100% of the shares in Vanguard is on the basis of four GTE fully paid ordinary shares for every one Vanguard share, or approximately 150,833,124 consideration shares. In conjunction, the Company will seek to raise $1 million at an issue price of at least $0.01 for exploration on both Vanguard and the Company’s tenements. The Company is now seeking shareholder approval for both the acquisition of Vanguard and $1 million share placement. Vanguard is a WA based unlisted public company incorporated on the 24 July 2009 that has two exploration projects, Ives Find and Fairbairn. Both of these projects are located in the Northern Yilgarn of WA near the Company’s current projects. Vanguard has invested approximately $1.5 million into these projects over the last six years. Earlier this year Vanguard made a promising new gold discovery at Ives Find where RC drilling intersected high grade gold mineralisation in two areas along strike of the historical Ives Find gold workings. Also previous work completed by Vanguard confirmed very high grade gold and silver mineralisation continuing at depth under the old workings. In addition to the gold prospectivity, the project has a favourable geological setting for lithium mineralisation with abundant pegmatites and granite intrusions that match the criteria in the US Geological Survey (“USGS”) guidelines for lithium exploration.
    [Show full text]
  • Sell-1731A , Gold – Bulk/Heap
    CONTACT INFORMATION Mining Records Curator Arizona Geological Survey 416 W. Congress St., Suite 100 Tucson, Arizona 85701 520-770-3500 http://www.azgs.az.gov [email protected] The following file is part of the James Doyle Sell Mining Collection ACCESS STATEMENT These digitized collections are accessible for purposes of education and research. We have indicated what we know about copyright and rights of privacy, publicity, or trademark. Due to the nature of archival collections, we are not always able to identify this information. We are eager to hear from any rights owners, so that we may obtain accurate information. Upon request, we will remove material from public view while we address a rights issue. CONSTRAINTS STATEMENT The Arizona Geological Survey does not claim to control all rights for all materials in its collection. These rights include, but are not limited to: copyright, privacy rights, and cultural protection rights. The User hereby assumes all responsibility for obtaining any rights to use the material in excess of “fair use.” The Survey makes no intellectual property claims to the products created by individual authors in the manuscript collections, except when the author deeded those rights to the Survey or when those authors were employed by the State of Arizona and created intellectual products as a function of their official duties. The Survey does maintain property rights to the physical and digital representations of the works. QUALITY STATEMENT The Arizona Geological Survey is not responsible for the accuracy of the records, information, or opinions that may be contained in the files. The Survey collects, catalogs, and archives data on mineral properties regardless of its views of the veracity or accuracy of those data.
    [Show full text]
  • Indigenous Peoples and Extractive Industries
    iv Stories of Eugene, the Earthworm i PITFALLS & PIPELINES Indigenous Peoples and Extractive Industries Authors: Abigail Anongos Dmitry Berezhkov Sarimin J. Boengkih Julie Cavanaugh-Bill Asier Martínez de Bringas Robert Goodland Dr. Stuart Kirsch Roger Moody Geoff Nettleton Legborsi Saro Pyagbara Brian Wyatt Edited by: Andy Whitmore ii Pitfalls and Pipelines: Indigenous Peoples and Extractive Industries iii Published by: With support from: iv Pitfalls and Pipelines: Indigenous Peoples and Extractive Industries Pitfalls and Pipelines: Indigenous Peoples and Extractive Industries Copyright © Tebtebba Foundation and IWGIA 2012 All rights reserved. No part of this book may be reproduced in any form or by any means without the written permission of the copyright owner and the publisher. The views expressed by the writers do not necessarily reflect those of the publisher. Published by Tebtebba Foundation No. 1 Roman Ayson Road, 2600 Baguio City, Philippines Tel. +63 74 4447703 * Tel/Fax: +63 74 4439459 E-mail: [email protected] Websites: www.tebtebba.org; www.indigenousclimate.org International Work Group for Indigenous Affairs (IWGIA) Classensgade 11 E, DK 2100 Copenhagen, Denmark Phone no: (+45) 35 27 05 00, Fax no: (+45) 35 27 05 07 E-mail: [email protected] Indigenous Peoples Links (PIPLinks) Finspace, 225-229 Seven Sisters Road, London, N4 2DA, UK Phone: +44(0)207 263 1002 Email: [email protected] Authors: Abigail Anongos, Dmitry Berezhkov, Sarimin J. Boengkih, Julie Cavanaugh-Bill, Asier Martínez de Bringas, Robert Goodland, Dr. Stuart Kirsch, Roger Moody, Geoff Nettleton, Legborsi Saro Pyagbara, and Brian Wyatt Editor: Andy Whitmore Copy Editor: Raymond de Chavez Coordinator: Leah Enkiwe-Abayao Cover and Book Design: Paul Michael Q.
    [Show full text]
  • Mineral Property Valuation's Relationship to Mineral Resource
    Mineral Property Valuation’s Relationship to Mineral Resource and Reserve Estimates Trevor R. Ellis, RM-SME, CPG, CMA, FAusIMM Chairman, Valuation Standards Committee, Society for Mining, Metallurgy, and Exploration (SME) Mineral Property Valuer Ellis International Services, Inc. Denver, Colorado, USA www.MineValuation.com National Mining Agency’s Mineral Resources and Reserves Week Bogotá, Colombia, 28-30 November 2018 1 Disclaimer Opinions expressed are those of Trevor Ellis. They might not represent the opinions of the SME Valuation Standards Committee. 2 Purpose of this Presentation • Show the status and relationship of current mineral property valuation standards globally. • Mention some of the uses of mineral property valuations and explain the common types of value requested for those. • Outline the key principles and requirements for the conduct of a mineral property valuation assignment. • Contrast the valuation process to a prefeasibility study economic evaluation net present value estimation. • Explain how CRIRSCO-based reports of exploration results, mineral resources, and mineral reserves should be used in developing market valuations of mineral properties. 3 Current Mineral Property Valuation Standards • In May 2018, the International Mineral Valuation Committee (IMVAL) published the 18-page IMVAL Template, Third Edition, of mineral property valuation standards and guidelines.* • IMVAL consists of representatives from SME (USA), IIMA (USA), VALMIN (Australasia), CIMVal (Canada), and SAMVAL (South Africa). • IMVAL was formed 2012 *https://mrmr.cim.org/media/1021/imval-template.pdf 4 Current Mineral Property Valuation Standards • IMVAL developed the Template as a harmonisation target for convergence of the existing national mineral property valuation standards (VALMIN, SAMVAL, and CIMVal). – So that those standards will operate similar to the Template and therefore each other, resulting is similar report content and quantitative value opinion.
    [Show full text]
  • Projects with Active WPC Permits
    State of Nevada Division of Environmental Protection -- Bureau of Mining Regulation and Reclamation Water Pollution Control (WPC) Program Tuesday, November 21, 2017 All Projects with Active WPC Permits Project Name Permit No. Organization County Physical Status Category Primary Commodity 327 Apex NEV2001103 Lake Mountain Mining, LLC Washoe Not Operating/Temp Physical Gold Closure Separation 5 Jokers Mine NEV2000112 Miles Neighbors Nye Operating Physical Gold/Silver Separation AA Block - Barrick NEV0090060 Barrick Goldstrike Mines Inc. Eureka Perm Closure Chemical >= Gold 2,000,000 t/y After Work 1,2,4 Claims NEV2013109 After Work 1, 2, 4 Claims Pershing Operating Physical Gold Project Separation Amy Claims Exploration NEV2009112 Ruggeri-Stocks LLC Elko Operating Physical Gold Project Separation Argenta Mine & Mill NEV0091045 Baker Hughes Lander Operating Physical Barite Separation Argentum / Columbus Salt NEV0098104 Columbus SM LLC Esmeralda Operating Chemical Other Metals 500,000 to < 1,000,000 t/y Arturo Mine Project NEV2013101 Barrick Goldstrike Mines Inc. Elko Operating Chemical >= Gold 2,000,000 t/y Ashdown Mine Infiltration NEV2006101 Silver Eagle Mining, LLC Humboldt Not Operating/Temp Grndwater None Closure Dischg/Dewateri ng < 50,000 g/d Page 1 of 17 Project Name Permit No. Organization County Physical Status Category Primary Commodity Ashdown Project (Ashdown NEV2005105 Precision Milling LLC Humboldt Not Operating/Temp Chemical 18,250 Molybdenum Mine and Morris Mill) Closure to < 36,500 t/y Aurora Project (Formerly NEV0087072 Klondex Aurora Mine Inc. Mineral Operating Chemical Gold/Silver Esmeralda) 100,000 to < 500,000 t/y Bald Mountain Mine NEV0050045 KG Mining (Bald Mountain), White Pine Operating Chemical >= Gold inc.
    [Show full text]