Mining Archaeology in the American West
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Metal Extraction Processes for Electronic Waste and Existing Industrial Routes: a Review and Australian Perspective
Resources 2014, 3, 152-179; doi:10.3390/resources3010152 OPEN ACCESS resources ISSN 2079-9276 www.mdpi.com/journal/resources Review Metal Extraction Processes for Electronic Waste and Existing Industrial Routes: A Review and Australian Perspective Abdul Khaliq, Muhammad Akbar Rhamdhani *, Geoffrey Brooks and Syed Masood Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia; E-Mails: [email protected] (A.K.); [email protected] (G.B.); [email protected] (S.M.) * Author to whom correspondence should be addressed; E-Mail: [email protected]; Tel.: +61-3-9214-8528; Fax: +61-3-9214-8264. Received: 11 December 2013; in revised form: 24 January 2014 / Accepted: 5 February 2014 / Published: 19 February 2014 Abstract: The useful life of electrical and electronic equipment (EEE) has been shortened as a consequence of the advancement in technology and change in consumer patterns. This has resulted in the generation of large quantities of electronic waste (e-waste) that needs to be managed. The handling of e-waste including combustion in incinerators, disposing in landfill or exporting overseas is no longer permitted due to environmental pollution and global legislations. Additionally, the presence of precious metals (PMs) makes e-waste recycling attractive economically. In this paper, current metallurgical processes for the extraction of metals from e-waste, including existing industrial routes, are reviewed. In the first part of this paper, the definition, composition and classifications of e-wastes are described. In the second part, separation of metals from e-waste using mechanical processing, hydrometallurgical and pyrometallurgical routes are critically analyzed. -
Cip and Cil Circuit Modelling
SGS MINERALS SERVICES – T3 SGS 1338 02-2014 CIP AND CIL CIRCUIT MODELLING The SGS carbon-in-pulp (CIP) / carbon- in-leach (CIL) modelling package is used to estimate the performance of a full-scale CIP or CIL plant and to derive the optimum design criteria based on the results of small scale experiments. It is a powerful design tool that uses the results from standard leach and adsorption tests (bottle roll tests) to generate kinetic data that are fitted to leaching and carbon adsorbtion rate equations (Figure 2). The rate data and mass balance equations are then applied to the SGS model to calculate the concentrations of gold in solution, on the carbon and in the ore for each stage of a multi-stage leach- adsorbtion circuit. The model allows for the generation of multiple operating scenarios, where • the number of leach and adsorption stages can be varied, • the carbon concentration per tank can be adjusted, • the carbon loading and final barren solutions can be manipulated, • and carbon advance and elution rates adjusted. PHILOSOPHY The SGS CIP/CIL model is based on a model developed by Fleming and Nicol • Robust predictions of steady state as (1984). The philosophy then was to strive APPLICATIONS well as transient carbon adsorption for simplicity and user-friendliness, rather behaviour from simple laboratory The SGS CIP/CIL model can be used for than precision through complexity. This batch tests, feasibility or production stage projects. is still true today in SGS‘ CIP and CIL • Economic sensitivity analyses of It is a cost effective way to determine modelling package. -
Underground Hard-Rock Mining: Subsidence and Hydrologic Environmental Impacts
Technical Report on Underground Hard-Rock Mining: Subsidence and Hydrologic Environmental Impacts By Steve Blodgett, M.S. and James R. Kuipers, P.E. Center for Science in Public Participation Bozeman, MT February 2002 Abstract: Subsidence and hydrology impacts occur at every underground mining operation bringing about changes to surface landforms, ground water and surface water. Although the same impacts to mining operations, man-made surface structures and other features are relatively well known and studied, the environmental impacts related to subsidence and hydrology at underground mines are not well known and have not been extensively described. This report examines the occurrence and environmental impacts of subsidence and effects on hydrology at underground hard-rock metal mines in the U.S. and abroad. Technical and scientific literature is cited on the cause and effect of underground mining on surface landforms and water resources. Existing laws and recommended regulatory provisions to address these impacts are discussed. Conclusions about subsidence and hydrologic impacts at underground hard-rock metal mines are provided along with recommendations for addressing those impacts. Case studies are provided from copper, molybdenum, silver and other hard-rock mines where significant subsidence and hydrology-related environmental impacts have occurred. The Center for Science in Public Participation (CSP2) is a non-profit organization dedicated to providing professional technical assistance to public interest groups; state, tribal and federal governments; and industry. This report has been published with financial support from various foundations and individuals, and from the Mineral Policy Center and Amigos Bravos. The opinions contained in this study are those of the authors and are based solely upon their own scientific and technical knowledge and expertise. -
A History of Tailings1
A HISTORY OF MINERAL CONCENTRATION: A HISTORY OF TAILINGS1 by Timothy c. Richmond2 Abstract: The extraction of mineral values from the earth for beneficial use has been a human activity- since long before recorded history. Methodologies were little changed until the late 19th century. The nearly simultaneous developments of a method to produce steel of a uniform carbon content and the means to generate electrical power gave man the ability to process huge volumes of ores of ever decreasing purity. The tailings or waste products of mineral processing were traditionally discharged into adjacent streams, lakes, the sea or in piles on dry land. Their confinement apparently began in the early 20th century as a means for possible future mineral recovery, for the recycling of water in arid regions and/or in response to growing concerns for water pollution control. Additional Key Words: Mineral Beneficiation " ... for since Nature usually creates metals in an impure state, mixed with earth, stones, and solidified juices, it is necessary to separate most of these impurities from the ores as far as can be, and therefore I will now describe the methods by which the ores are sorted, broken with hammers, burnt, crushed with stamps, ground into powder, sifted, washed ..•. " Agricola, 1550 Introduction identifying mining wastes. It is frequently used mistakenly The term "tailings" is to identify all mineral wastes often misapplied when including the piles of waste rock located at the mouth of 1Presented at the 1.991. National mine shafts and adi ts, over- American. Society for Surface burden materials removed in Mining and Reclamation Meeting surface mining, wastes from in Durango, co, May 1.4-17, 1.991 concentrating activities and sometimes the wastes from 2Timothy c. -
Secretary Old Arrastra Gold Mining Co
Wednesday, March 25, 1905 THE SUMPTER MINER &XWaMWWWMto t If you will plve us just n few min- i utes of your valuable timo we will briefly set forth the Merits and Future Possibilities of Our Property. We know we have a splendid Busi- ness Proposition, and believe we are rendering good service in spreading the Untinted Facts before you. We wish we had an hour to talk the mat- ter all over with you; better still, we should like to take you to our Property and show you every Foot of Gold Bearing Ground. Since these are impossibilities, for the present at least, we kindly ask you to listen to our story. We are an Incorporated Body, known as the OLD ARRA8TRA GOLD MINING COMPANY. The Capitalization has been fixed at One Million Dollars, Divided into One Million Shares of the Par Value of One Dollar Each. One half of this stock has been Reserved as Treasury Stock, the sale of whloh will provide ample funds to Further Exploit the Property and Purchase the Necessary Machinery to make it a steady and Profitable Producer. This Stock is and carries no Personal Liabili- ties. Since our Incorporation is Under the Laws of Arizona. It is also Fully Paid when the Certificate is Issued to the Purchaser. In view of our very reasonable capitalization, Net Profit of only Ten Thousand Dol- V lars Per Month, would pay Twelve per cent per annum, on the par value of the entire stock, or the Enormous Profit of .Ono Hundred and Twenty per cent per annum on the present price of Btock. -
Treatment and Microscopy of Gold
TREATMENT AND MICROSCOPY OF GOLD AND BASE METAL ORES. (Script with Sketches & Tables) Short Course by R. W. Lehne April 2006 www.isogyre.com Geneva University, Department of Mineralogy CONTENTS (Script) page 1. Gold ores and their metallurgical treatment 2 1.1 Gravity processes 2 1.2 Amalgamation 2 1.3 Flotation and subsequent processes 2 1.4 Leaching processes 3 1.5 Gold extraction processes 4 1.6 Cyanide leaching vs. thio-compound leaching 5 2. Microscopy of gold ores and treatment products 5 2.1 Tasks and problems of microscopical investigations 5 2.2 Microscopy of selected gold ores and products 6 (practical exercises) 3. Base metal ores and their beneficiation 7 3.1 Flotation 7 3.2 Development of the flotation process 7 3.3 Principles and mechanisms of flotation 7 3.4 Column flotation 9 3.5 Hydrometallurgy 10 4. Microscopy of base metal ores and milling products 10 4.1 Specific tasks of microscopical investigations 11 4.2 Microscopy of selected base metal ores and milling products 13 (practical exercises) 5. Selected bibliography 14 (Sketches & Tables) Different ways of gold concentration 15 Gravity concentration of gold (Agricola) 16 Gravity concentration of gold (“Long Tom”) 17 Shaking table 18 Humphreys spiral concentrator 19 Amalgamating mills (Mexican “arrastra”, Chilean “trapiche”) 20 Pressure oxidation flowsheet 21 Chemical reactions of gold leaching and cementation 22 Cyanide solubilities of selected minerals 23 Heap leaching flowsheet 24 Carbon in pulp process 25 Complexing of gold by thio-compounds 26 Relation gold content / amount of particles in polished section 27 www.isogyre.com Economically important copper minerals 28 Common zinc minerals 29 Selection of flotation reagents 30 Design and function of a flotation cell 31 Column cell flotation 32 Flowsheet of a simple flotation process 33 Flowsheet of a selective Pb-Zn flotation 34 Locking textures 35 2 1. -
Frontier West” Mining
“The Frontier West” Mining • Many Americans were lured to the West by the chance to strike it rich mining gold and silver. • The western mining boom had begun with the California Gold Rush of 1849. • From California miners spread out in search of new strikes. Comstock Lode • 1859 – Gold was discovered in the Sierra Nevada. • Henry Comstock = “Comstock Lode” • Unknown to its owners, Comstock Lode was even richer in another precious metal. “danged blue stuff” • Miners at Comstock Lode complained about the heavy Blue sand that was mixed in with the gold. • Some curious miners had the “danged blue stuff” taken to California to be tested. • Tests showed that the sand was loaded with silver! Boom Towns • The Comstock Lode attracted thousands of people to the West. • The mining camp grew into the “boom town” – a town that experiences sudden growth and economic success) of Virginia City, Nevada. • Miners eventually moved into other areas such as Montana, Idaho, Colorado, and South Dakota. “Ghost Towns” • Towns grew up near all the major mining sites. Mines lasted only a few years, When the ore was gone, boom towns” turned into “ghost towns”. • Other settlements lasted and grew. Denver and Colorado Springs grew up near rich gold mines. • The surge of miners into the West created some problems: – Miners and towns polluted clear mountain streams, – Miners cut down forests to get wood for buildings, and – Miners forced Native Americans from their lands. •A few miners got “rich” quick – most did not! Railroads • Railroad Companies raced to law down track to the mines. • The federal government encouraged railroad building in the West by loaning money to the railroad companies. -
MINING in BAKER COUNTY, 1861 to 1959* by Norman S
Vol.21, No.3 THE ORE.- BIN 21 March 1959 Portland, Oregon STATE OF OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES Head Office: 1069 State Office Bldg., Portland I, Oregon Telephone: CApitol 6-2161, Ext. 488 Field Offices 2033 First Street 239 S. E. "H"Street Baker Grants Pass *************************** MINING IN BAKER COUNTY, 1861 to 1959* By Norman S. Wagner** Introduction Baker County mining began with the discovery of gold in 'Griffin Gulch in 1861. This and the develop ment which followed at Auburn represent gold mining at its historic best. Since 1861, much water has flowed down the sluice boxes with respect to mineral resource development within the county. As a result, the dis covery story is left for historians to tell, and the following paragraphs are devoted to the high points of the many kinds of mining endeavors that occurred in Baker County between 1861 and 1959. Hydraulic and sluicing operations All of the earlier placer operations have one thing in common with Griffin Gulch and Auburn. This is that they were carried out by means of ground sluicing and hydraul icking, using generous amounts of hand labor. These means of handl ing placer ground continued in exclusive use throughout the first forty years of Baker County mining history. It wasn't until the present century that the more familiar bucket-line dredges and other kinds of mechanized digging and washing plants made their appearance. Even yet the old methods are still employed on a small scale in circumstances where ground conditions permit. The Rye Valley placers on Dixie Creek represent a notable example of an early discovery made shortly after 1862. -
Production of Gold
Production of Gold Background A feasibility study on the production of gold at a fictitious mine (Moapa mine) in Elko County, Nevada is to be performed. The mine is capable of producing 325,800 tons of high-grade ore per year for 8 years. The deposit contains 0.12 ounces of gold per ton of high-grade ore and can be acquired at a cost of $10 per ton of ore (cost of mining ore at site). A sodium cyanide process is used to extract the gold from the ore, and various other processing techniques are used to produce 99.9% pure gold bullion from the ore. The results of the feasibility study show that the ore can be processed by agitation leaching, which is preferred over heap leaching due to the low recovery associated with the heap leaching technology. The problem is to find the break-even price of gold for this mining operation. The process is currently unprofitable with a gold price around $300 per ounce. Process Description Unit 100 – Size Reduction of Ore The BFD of the overall process is shown in Figure 1. The PFD for Unit 100, shown in Figure 2, is designed to reduce 41.5 tons/hr of gold ore from a feed range of 2- 5” to 160 microns. The mined ore is fed using a Grizzly Feeder, F-101, into a Jaw Crusher, J-101, where 80% of the ore is crushed to 1.75” or smaller. The remaining 20% are recycled back into F-101 (not shown on PFD). The ore is then sent to Screen S-101 where the ore that does not pass through the first deck is sent to the Standard Cone Crusher SC-101. -
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. -
Studying of Preliminary Roast and Smelting Gold-Containing Electronic Scrap with Copper Collector
SCIENTIFIC PROCEEDINGS IX INTERNATIONAL CONGRESS "MACHINES, TECHNOLОGIES, MATERIALS" 2012 ISSN 1310-3946 STUDYING OF PRELIMINARY ROAST AND SMELTING GOLD-CONTAINING ELECTRONIC SCRAP WITH COPPER COLLECTOR. Prof. Strizhko L.S., engineer Shigin E.S., engineer Fokin O.A. Abstract: Electronic scrap is valuable type of complex recyclable metallurgical raw. Efficient technology requires complex recovering electronic scrap with extraction ferrous, non-ferrous and precious metals. Requirement of preliminary roast to remove and recycle gases from organic combusting are shown. Optimal parameters of roast has been determined. Keywords: Gold, precious metals, copper, electronic scrap, collector smelting, recycle, roast 1. Introduction. Organic materials (polystyrene, hardened paper, One of mass valuable type of complex recyclable metallurgical polyvinylchloride etc.) make 5-27 % of electronic scrap, according raw is electronic scrap. Total value of obtained electronic scrap in to scrap’s type. Organic materials have to be removed from Russia is millions tons per year now. During conversion to market electronic scrap preliminarily (before melt) due to high speed of economy thousands of unprofitable plants has been stopped and organic materials’ combusting significant amount of obtained gases liquidated in recent years, huge amounts equipment and hardware as well as problem with recovery and cleaning. has been formed, that should be recycled. On the one hand this In connection with the above electronic scrap with precious scrap is damage to environment, and on the other hand it’s very metals is preliminarily treated by roast. valuable recourse, that exceed raw mineral in precious components’ Degree of organic removal from electronic scrap in dependence content. Usage of complex-composition hard-processing electronic of temperature, duration has been studied when research was scrap in metal recycling is increased now. -
06-12-1859 Comstock Lode.Indd
This Day in History… June 12, 1859 The Comstock Lode June 12, 1859, is generally accepted as the re-discovery date of the Comstock Lode. Gold and silver had been found in the area as early as 1850 by emigrants on their way to California. It proved to be the richest silver lode in the US, with miners collecting nearly seven million tons of silver over the next two decades. Mormon immigrants first found gold in the area in the spring of 1850. They panned gold until the mountain snow melted and they could leave for California, where they expected to find more gold. In the years to come, more Issued for the 100th anniversary of emigrants passed through the canyon and tried their luck, but when the water the discovery in 1859. It pictures ran out near the end of summer, they would continue their trek to California. Comstock, O’Reilly, and McLaughlin. Ethan and Hosea Grosh, veterans of the California Gold Rush, are credited with discovering rich silver and gold veins in what is now called Gold Hill, near Virginia City in 1857. Hosea died of infection from a foot injury, and Ethan and an associate traveled to California with prospecting samples, hoping to raise funds for their dig. They left Henry Comstock to watch over their cabin and land. Ethan never finished the journey, dying of frostbite-related injuries. Comstock then claimed the cabin and land as his own. In Comstock’s possession were more ore samples, as well as detailed notes that, being illiterate, he couldn’t read.