Philip Henry Argall
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Significance of Mineralogy in the Development of Flowsheets for Processing Uranium Ores
JfipwK LEACHING TIME REAGENTS TEMPERATURE FLOCCULANT CLARITY AREA COUNTER CURRENT DECANTATION It 21 21 J^^LJt TECHNICAL REPORTS SERIES No.19 6 Significance of Mineralogy in the Development of Flowsheets for Processing Uranium Ores \W# INTERNATIONAL ATOMIC ENERGY AGENCY, VIENNA, 1980 SIGNIFICANCE OF MINERALOGY IN THE DEVELOPMENT OF FLOWSHEETS FOR PROCESSING URANIUM ORES The following States are Members of the International Atomic Energy Agency: AFGHANISTAN HOLY SEE PHILIPPINES ALBANIA HUNGARY POLAND ALGERIA ICELAND PORTUGAL ARGENTINA INDIA QATAR AUSTRALIA INDONESIA ROMANIA AUSTRIA IRAN SAUDI ARABIA BANGLADESH IRAQ SENEGAL BELGIUM IRELAND SIERRA LEONE BOLIVIA ISRAEL SINGAPORE BRAZIL ITALY SOUTH AFRICA BULGARIA IVORY COAST SPAIN BURMA JAMAICA SRI LANKA BYELORUSSIAN SOVIET JAPAN SUDAN SOCIALIST REPUBLIC JORDAN SWEDEN CANADA KENYA SWITZERLAND CHILE KOREA, REPUBLIC OF SYRIAN ARAB REPUBLIC COLOMBIA KUWAIT THAILAND COSTA RICA LEBANON TUNISIA CUBA LIBERIA TURKEY CYPRUS LIBYAN ARAB JAMAHIRIYA UGANDA CZECHOSLOVAKIA LIECHTENSTEIN UKRAINIAN SOVIET SOCIALIST DEMOCRATIC KAMPUCHEA LUXEMBOURG REPUBLIC DEMOCRATIC PEOPLE'S MADAGASCAR UNION OF SOVIET SOCIALIST REPUBLIC OF KOREA MALAYSIA REPUBLICS DENMARK MALI UNITED ARAB EMIRATES DOMINICAN REPUBLIC MAURITIUS UNITED KINGDOM OF GREAT ECUADOR MEXICO BRITAIN AND NORTHERN EGYPT MONACO IRELAND EL SALVADOR MONGOLIA UNITED REPUBLIC OF ETHIOPIA MOROCCO CAMEROON FINLAND NETHERLANDS UNITED REPUBLIC OF FRANCE NEW ZEALAND TANZANIA GABON NICARAGUA UNITED STATES OF AMERICA GERMAN DEMOCRATIC REPUBLIC NIGER URUGUAY GERMANY, FEDERAL REPUBLIC OF NIGERIA VENEZUELA GHANA NORWAY VIET NAM GREECE PAKISTAN YUGOSLAVIA GUATEMALA PANAMA ZAIRE HAITI PARAGUAY ZAMBIA PERU The Agency's Statute was approved on 23 October 1956 by the Conference on the Statute of the IAEA held at United Nations Headquarters, New York; it entered into force on 29 July 1957. -
Curbing Illicit Mercury and Gold Flows in West Africa: Options for a Regional Approach
Curbing Illicit Mercury and Gold Flows in West Africa: Options for a Regional Approach i INCLUSIVE AND SUSTAINABLE INDUSTRIAL DEVELOPMENT ii Curbing Illicit Mercury and Gold Flows in West Africa: Options for a Regional Approach iii November 2018 iv © UNIDO 2018. All rights reserved. This document has been produced without formal United Nations editing. The designations employed and the presentation of the material in this document do not imply the expression of any opinion whatsoever on the part of the Secretariat of the United Nations Industrial Development Organization (UNIDO) concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries, or its economic system or degree of development. Designations such as ‘developed’, ‘industrialized’ or ‘developing’ are intended for statistical convenience and do not necessarily express a judgement about the stage reached by a particular country or area in the development process. Mention of firm names or commercial products does not constitute an endorsement by UNIDO. Unless otherwise men- tioned, all references to sums of money are given in United States dollars. References to ‘tons’ are to metric tons, unless otherwise stated. All photos © UNIDO unless otherwise stated. Cover photo by Sadibou Sylla Acknowledgements This report was authored by Marcena Hunter of the Global Initiative Against Transnational Organized Crime. The report is part of the United Nations Industrial Development Organization (UNIDO) project, funded by the Government of Switzerland, to assist the Economic Community of West African States (ECOWAS) in its early implementation of the Minamata Convention. More information about the Minamata Convention and UNIDO’s work can be found on UNIDO’s website <https://www.unido.org/mercury> or by emailing Gabriela Eigenmann at [email protected]. -
S Ndlovu (PDF)
Extraction of Gold Then, Now and the Future Prof Sehliselo Ndlovu DST/NRF SARChI: Hydrometallurgy and Sustainable Development University of the Witwatersrand, Johannesburg Building a Robust Minerals Industry 3 – 4 July 2017, Cresta Lodge, Harare University of the Witwatersrand Johannesburg Founded Oct. 1896: School of Mines Approx. 37 000 Students 5 Faculties, 33 Schools, 3610 Courses >160 000 Degrees Conferred since 1922 55% Female Students 10 National Centres of Excellence Home to the Bidvest Football Club( Current PSL league Champions) Evolution in Gold Processing Past Technologies • Amalgamation • Panning Current Technologies • Cyanide leaching • Processing of Emerging and Future refractory ores Technologies • Bio-oxidation • Ionic liquids • Alternative leaching • Ultrasonic leaching reagents • Corn starch?? Past Technologies Used in Ancient Times History of gold extends back at least 6,000 years. Egypt and Mesopotamia around 4000 BC. Gravity Separation: Gold Panning Gold concentrated by washing lighter river sands with water Leaves dense gold particles Alternative- wash gold-bearing sand and gravel over a woollen fleece Traps heavier gold dust that would sink into the wool fibres. Advantages • Simplicity Disadvantages • Labour intensive Gravity Separation: Sluicing • Water is channelled to flow through a sluice-box. • Sluice-box is essentially a man-made channel with riffles (barriers) at the bottom. • Riffles create dead-zones in the water current which allows gold to drop out of suspension. Sluicing and panning results in the direct recovery of small gold nuggets and flakes. Gold Parting: Salt Cementation Process • Invented to remove Ag from Au-Ag mixtures around 6th century BC. Mix: argentiferous gold foil, common salt, brick dust or burnt clay and urine in a sealed container. -
Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process
metals Article Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process Pingfeng Fu 1,2,* ID , Zhenyu Li 1, Jie Feng 1 and Zhenzhong Bian 1 1 School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China; [email protected] (Z.L.); [email protected] (J.F.); [email protected] (Z.B.) 2 Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China * Correspondence: [email protected]; Tel.: +86-10-6233-2902 Received: 25 June 2018; Accepted: 19 July 2018; Published: 21 July 2018 Abstract: Cyanide tailings are the hazardous waste discharged after gold cyanidation leaching. The recovery of gold and iron from cyanide tailings was investigated with a combined direct reduction roasting and leaching process. The effects of reduction temperature, coal dosage and CaO dosage on gold enrichment into Au-Fe alloy (FexAu1−x) were studied in direct reduction roasting. Gold containing iron powders, i.e., Au-Fe alloy, had the gold grade of 8.23 g/t with a recovery of 97.46%. After separating gold and iron in iron powders with sulfuric acid leaching, ferrous sulfate in the leachate was crystallized to prepare FeSO4·7H2O with a yield of 222.42% to cyanide tailings. Gold enriched in acid-leaching residue with gold grade of 216.58 g/t was extracted into pregnant solution. The total gold recovery of the whole process reached as high as 94.23%. The tailings generated in the magnetic separation of roasted products, with a yield of 51.33% to cyanide tailings, had no toxic cyanide any more. -
Cornish Association of NSW - No
Lyther Nowodhow - Newsletter - of the Cornish Association of NSW - No. 377 - November / December, 2018 ______________________________________________________________________________________________________________________ Committee News:. 'Renumber Clause 16 as 176 Bank account at 31/10/18 bal: $9,046.37 If you wish to have another copy of the Rules “It was great to have 23 members and friends prior to the meeting, the document is available at our lunch on 21 November! I wish all our to print or download from our web site at: members, and their families, a very Australian & Cornish Christmas and now look forward to h p:11members.optusnet.com.au10evrenor1 seeing you at our AGM and St Piran’s lunch on canswrul.pdf 2 March. Please keep the date free!“ Joy Dunkerley, President You and your ideas are always welcome Our Lending & Research Library Committee Meeting held 5 November: Most Our librarian, Eddie Lyon, has stepped down nd of us met, for the 2 time in 2018 and from the role due to a pending tree-change discussion covered: minutes and move. The material has been relocated, and we correspondence, reports from the office bearers will bring you more information later. (incl. a provisional financial report for the year), discussion on the future program, including the AGM and St Piran’s Lunch and on a proposal from the Secretary for Rule changes. NOTICE OF AGM The full listing of books has been on the CANSW web site for some time. The direct page link to Members are hereby informed that our Annual view is: General Meeting will be held on Saturday 2 http://members.optusnet.com.au/~kevrenor/ March, 2019, at Ryde Eastwood Leagues Club, canswlib5_alpha.xls Ryedale Road West Ryde. -
Simulation Study of the Optimal Distribution of Cyanide in a Gold Leaching Circuit
Minerals Engineering 19 (2006) 1319–1327 This article is also available online at: www.elsevier.com/locate/mineng Simulation study of the optimal distribution of cyanide in a gold leaching circuit L.R.P. de Andrade Lima a,b,*, D. Hodouin a a Department of Mining, Metallurgical, and Materials Engineering, Laval University, Quebec City, Canada G1K 7P4 b Department of Materials Science and Technology, Federal University of Bahia, C.P. 6974, Salvador, BA 40810-971, Brazil Received 25 September 2005; accepted 1 December 2005 Available online 19 January 2006 Abstract The mineral industry has been using cyanidation to recover gold from ores for more than a century; however, a systematic study of the best reactant addition strategy in a cascade of agitated leaching tanks is not available in the open literature. A phenomenological math- ematical model of the gold cyanidation process, calibrated with a set of industrial data from an Australian plant, together with an eco- nomic performance index is used to analyze this problem. The simulated results show that the best compromise between the two antagonistic effects, cyanide consumption and gold recovery, which are both function of cyanide concentrations, leads to a reagent dis- tribution that depends on the leaching and cyanide consumption kinetics, pulp feed characteristics, and economic factors such as the gold market value. For the specific studied plant, in the operating range of low cyanide consumption and fast gold dissolution, all the cyanide must be added in the first tank; however, in the operating conditions of high cyanide consumption, cyanide has to be distributed in the first, second and third tanks. -
Tungsten and Gold Recovery from Alaskan Scheelite-Bearing Ores
¿I ri 9251 REPORT OF INVESTIGATIONS/1989 LIBRARY SPOKANE RESEARCH CENTER RECEIVED SEP5 1983 U.S. BUREAU OF MINES E 315 MONTGOMERY AVE SPOKANE, W A 99207 Tungsten and Gold Recovery From Alaskan Scheelite-Bearing Ores By J. N. Greaves, W. R. McDonald, and J. H. Maysilles M ission: As the Nation's principal conservation agency, the Department of the Interior has respon sibility for most of our nationally-owned public lands and natural and cultural resources. This includes fostering wise use of our land and water resources, protecting our fish and wildlife, pre serving the environmental and cultural values of our national parks and historical places, and pro viding for the enjoyment of life through outdoor recreation. The Department assesses our energy and mineral resources and works to assure that their development is in the best interests of all our people. The Department also promotes the goals of the Take Pride in America campaign by encouraging stewardship and citizen responsibil- ityforthe public lands and promoting citizen par ticipation in their care. The Department also has a major responsibility for American Indian reser vation communities and for people who live in Island Territories under U.S. Administration. Report of Investigations 9251 Tungsten and Gold Recovery From Alaskan Scheelite-Bearing Ores By J. N. Greaves, W. R. McDonald, and J. H. Maysilles UNITED STATES DEPARTMENT OF THE INTERIOR Manuel Lujan, Jr., Secretary BUREAU OF MINES T S Ary, Director Library of Congress Cataloging in Publication Data: Greaves, J. N. Tungsten and gold recovery from Alaskan scheelite-bearing ores. (Report of investigations / United States Department of the Interior, Bureau of Mines; 9251) Bibliography: p. -
Worcestershire Has Fluctuated in Size Over the Centuries
HUMAN GENETICS IN WORCESTERSHIRE AND THE SHAKESPEARE COUNTRY I. MORGAN WATKIN County Health Department, Abet ystwyth Received7.x.66 1.INTRODUCTION THEwestern limits of Worcestershire lie about thirty miles to the east of Offa's Dyke—the traditional boundary between England and Wales —yet Evesham in the south-eastern part of the county is described by its abbot in a petition to Thomas Cromwell in as situated within the Principality of Wales. The Star Chamber Proceedings (No. 4) in the reign of Henry VII refer to the bridge of stone at Worcester by which the king's subjects crossed from England into Wales and the demonstrations against the Act of 1430 regulating navigation along the Severn were supported by large numbers of Welshmen living on the right bank of the river in Worcestershire. The object of the investigation is to ascertain whether significant genetic differences exist in the population of Worcestershire and south-western Warwickshire and, in particular, whether the people living west of the Severn are more akin to the Welsh than to the English. The possibility of determining, on genetic grounds, whether the Anglo- Saxon penetration was strongest from the south up the rivers Severn and Avon, or across the watershed from the Trent in the north, or from the east through Oxfordshire and Warwickshire is also explored. 2. THECOUNTY Worcestershirehas fluctuated in size over the centuries and Stratford-on-Avon came for a period under its jurisdiction while Shipston-on-Stour, now a Warwickshire township, remained in one of the detached portions of Worcestershire until the turn of the present century. -
Myths and Realities in Artisanal Gold Mining Mercury Contamination
MYTHS AND REALITIES IN ARTISANAL GOLD MINING MERCURY CONTAMINATION by GUSTAVO ANGELOCI SANTOS A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE FACULTY OF GRADUATE STUDIES (Mining Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) April 2013 © Gustavo Angeloci Santos 2013 ABSTRACT The world faces a major gold rush currently. Worldwide 15 million people work directly in artisanal gold mining in more than 55 countries. The usual method of extraction is amalgamation and cyanidation, or very commonly a combination of both. Significant amounts of contaminants are released to rivers and soil, generating environmental and health concerns. The majority of artisanal miners are involved in micro-mining, but it is believed that the majority of contamination comes from small to large artisanal operations. Larger operations involve less people, but process much more material, re- leasing much more contaminants as well. The present work explains how contamination is generated, through a com- prehensive analysis of the labor division in small-scale mining sites around the world, and also analyses aspects of different intervention approaches. Different approaches are taken by different groups working on the problem around the world. This work evaluates the most common kinds of interven- tion, with special attention to technical and legal aspects in trying to elimi- nate mercury use in gold extraction. The study is conducted by comparing different interventions strategies to evaluate the myths and realities from an engineering perspective. Special attention is paid to the evaluation of alterna- tives to amalgamation process for gold such as intensive cyanidation, borax direct smelting and chlorination. -
Mercury and Mercury Compounds
United States Office of Air Quality EPA-454/R-97-012 Environmental Protection Planning And Standards Agency Research Triangle Park, NC 27711 December 1997 AIR EPA LOCATING AND ESTIMATING AIR EMISSIONS FROM SOURCES OF MERCURY AND MERCURY COMPOUNDS L & E EPA-454/R-97-012 Locating And Estimating Air Emissions From Sources of Mercury and Mercury Compounds Office of Air Quality Planning and Standards Office of Air and Radiation U.S. Environmental Protection Agency Research Triangle Park, NC 27711 December 1997 This report has been reviewed by the Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, and has been approved for publication. Mention of trade names and commercial products does not constitute endorsement or recommendation for use. EPA-454/R-97-012 TABLE OF CONTENTS Section Page EXECUTIVE SUMMARY ................................................ xi 1.0 PURPOSE OF DOCUMENT .............................................. 1-1 2.0 OVERVIEW OF DOCUMENT CONTENTS ................................. 2-1 3.0 BACKGROUND ........................................................ 3-1 3.1 NATURE OF THE POLLUTANT ..................................... 3-1 3.2 OVERVIEW OF PRODUCTION, USE, AND EMISSIONS ................. 3-1 3.2.1 Production .................................................. 3-1 3.2.2 End-Use .................................................... 3-3 3.2.3 Emissions ................................................... 3-6 4.0 EMISSIONS FROM MERCURY PRODUCTION ............................. 4-1 4.1 PRIMARY MERCURY -
Cyanide and Cyanide Complexes in the Gold
CYANIDE AND CYANIDE COMPLEXES IN THE GOLD- MINE POLLUTED LAND IN THE EAST AND CENTRAL RAND GOLDFIELDS, SOUTH AFRICA. Elysee Bakatula Nsimba (0700692R) A dissertation submitted to the faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Master of Science. Johannesburg, 2009 CHAPTER ONE ─ INTRODUCTION 1.1 The history of mining on the Witwatersrand Basin The metropolis of Johannesburg, South Africa’s largest city and financial centre, owes its origin to the gold-bearing rocks of the Witwatersrand Basin (Figure 1.1). The basin-roughly oval in shape, approximately 350 km north east to south west direction and stretching over 150 km across-host seven major goldfields. Figure 1.1 The Witwatersrand basin (Viljoen and Reimold, 1999) 1 The gold-bearing conglomerate mined in the Witwatersrand Basin has a typical mineralogical composition of (Feather and Koen, 1975): • Quartz (70-90%); • Phyllosilicates (10-30%), consisting mainly of sericite, KAl 2(AlSi 3O10 )(OH) 2; • Accessory and minor minerals (1-5%). Some 70 different ore minerals have been identified in the conglomerates, the most abundant of which, after pyrite, are uranite (UO 2), brannerite (UTi 2O6), arsenopyrite (FeAsS), cobaltite (CoAsS), galena (PbS), pyrrhotite (FeS), gerdofite (NiAsS) and chromite (FeCr 2O4). Amalgamation Amalgamation was the principal gold recovery method used in South African gold mines at the start of mining in 1886. Crude amalgamation is still practiced by some artisanal gold miners in South Africa, mainly in the Mpumalanga Province. Unfortunately the method is in widespread use in some African countries (Sudan, Tanzania, D.R. -
Kinross Gold Corporation 2010 Annual Report
TRANSFORMING OUR FUTURE KINROSS GOLD CORPORATION 2010 ANNUAL REPORT In 2010, Kinross established itself as the new growth leader among senior 2010 HIGHLIGHTS gold producers while delivering record operational and fi nancial results. We signifi cantly upgraded our portfolio by acquiring strategic assets in high- Acquired Red Back Mining The transformational combination with Red Back expanded our global portfolio, including potential gold regions — including Tasiast in Mauritania, one of the world’s the addition of the spectacular Tasiast project, giving Kinross the best growth profi le among fastest-growing gold resources. At the same time, we continued to build our senior gold producers. capacity to deliver on our ambitious growth plans by adding new strength to Increased Revenue, Cash Flow and Earnings For the fi rst time, annual revenue exceeded $3 billion, an increase of 25% over 2009, while our global organization. adjusted operating cash fl ow exceeded $1 billion. Adjusted net earnings increased by 57% and adjusted net earnings per share increased by 32%. With a balanced global portfolio of ten operating mines and four high-quality Advanced Growth Projects growth projects, Kinross expects to double its share of world gold production With new studies completed at Tasiast, Fruta del Norte, Lobo-Marte and Dvoinoye, we are in the next fi ve years. making signifi cant and steady progress advancing the projects that will fuel our next round of growth. By 2015 we expect production to grow to 4.5 — 4.9 million ounces, double our 2010 production. Expanded Gold Reserves and Resources In 2010, Kinross increased total proven and probable gold reserves by 23% to 62.4 million gold ounces.