Search Documents

By R. Thierbach, W. Kahnt, Oberthür. T., D. Eisenburger, V. Gundelach

ABSTRACT: The ground penetrating radar (GPR) method was used in a platinum mine in Zimbabwe by members of the Federal Institute for Geosciences and Mineral Resources (BGR). The measurements were carried out in boreholes and drifts. Electromagnetic re?ections from a fault that consistently trends parallel to the mineralization zone permitted the mapping of the economically minable parts of the deposit. An introduction is given to the geology of the studied area and the application of the GPR method. The electrical parametres of the rocks are measured in situ, the GPR measurements are displayed with radargrams, and the visible structures are explained in illustrations.

Jan 1, 2010

By G. K. Herzog

THE problems relating to the construction and use o{ mining equipment are basically the same as those pertaining to equipment in other industries. It is true that much mining equipment is subjected to an unusually severe combination of shock, high stresses, abrasive wear, and corrosive ? conditions, but in other industries, also, equipment must operate under similar adverse conditions, so that their experiences may readily be applied to the problems of the mining industry. Steel and iron are for obvious reasons the most suitable materials for the construction of the greater part of the equipment used in the mining industry. For a large percentage of uses, the ordinary plain carbon-steels and ordinary or unalloyed cast-iron are, and probably will continue to be for a long rime, entirely satisfactory materials. There are, however, many. conditions which cannot be satisfactorily taken care of by these materials, and alloy steels and irons must be used where the greatest possible economy is desired. In general, alloy steels and irons are used where it is necessary or economically desirable to use materials possessing properties superior to plain carbon-steel or ordinary cast-irons, such as: (a) better strength (b) better wear resistance (c) better corrosion resistance (d) better resistance to high temperatures (e) better resistance to low temperatures or combinations of two or more of these advantages. There are also conditions where materials having other special properties are required, such as, for example, certain magnetic or electrical properties for electrical machinery; but in the great majority of cases, one or more of the five advantages listed are the most desired.

Jan 1, 1938

By R. B. Humphrey

Cut-and-fill mining methods at the Thompson Mine have undergone significant changes since production began in 1961. Changes have been introduced in almost all aspects of the mining operation, from the original timbered chutes and air-operated slushers to the present-day bored raises, footwall ore passes and load-haul-dump units. This paper describes the evolution of mechanized cut-and fill mining methods, highlighting the changes in design for stopes and service openings, ground support methods; hydraulic filling and ventilation systems. A mechanized stoping area is described from the initial mining concept through design, development, construction and mining cycles.

Jan 1, 1979

By J. R. Perumareddi, V. S. Sastri, M. Elboujdaini

It is well known that high strength steels used in aerospace industry, are generally susceptible to hydrogen embrittlement during surface treatment such as electroplating with zinc on cadmium. Hydrogen embrittlement reduces ductility and results in brittle fracture rather than failure by plastic deformation. Hydrogen embrittlement of high strength steels is mitigated by surface treatment such as plating with other metals. Data on the hydrogen contents of steels before and after surface treatment by hot extraction-thermal conductivity, secondary ion mass spectrometry (SIMS) and UV-visible spectroscopy along with the mechanism are presented.

Jan 1, 2006

By Norma G. González

La littérature et notre expérience en Bolivie dans une communauté minière très divisée comme celle de Huanuni nous montrent le besoin d?envisager des négociations gagnant-gagnant entre communauté et entreprise minière, non pas comme un point de départ, mais comme un résultat à atteindre, qui nécessite la préparation de conditions préalables. Cela implique fondamentalement de mettre l?accent sur le processus qui permettrait par la suite aux parties de mieux traiter les questions de contenu. Suivant cette hypothèse générale, l?initiative conjointe entre le Ministère des ressources naturelles du Québec et le CECI ?Développement des mécanismes de négociation entre communauté et entreprise minière? peut dégager, après un an et demi d?expérience pilote dans le site minier de Huanuni, département d?Oruro, Bolivie, les leçons préliminaires suivantes. Ce processus requiert: ??Agir, en tant qu?organisme consultant tierce partie, selon des principes et une méthodologie qui relèvent de la Communication publique et de la Médiation ; ??Comprendre et agir à partir de la ?réalité sociale? des parties en présence: l?entreprise minière, l?État et les différents groupes de la communauté; ??Intervenir sur les ?réalités sociales? des parties, par des actions d?éducation et de diffusion dans le but de préparer les personnes, les institutions et les organisations de la société civile, à des changements durables du modèle de communications existante; Approfondir la compréhension de la ?réalité sociale? du conflit (la culture du conflit, les méthodes populaires de résolution des problèmes et de gestion des conflits) afin d?offrire aux bénéficiaires les technologies appropriées pour la transformation de cette culture de confrontation violente en gestion constructive des conflits. Par ricochet, nous espérons ainsi faciliter l?attraction des investissements dans le secteur minier.

May 1, 2001

By Abdelhak Bentriou

The choice of tool for the first well of an oilfield or gasfield is an important factor, given that we will be drilling with the same type of tool for the entire phase and explains why we need to have another type for comparison based on the efficiency of the tool and its ability to crush the rock, and the wear of different types of tools. Development of theoretical and practical tests to determine the optimal regime for drilling is required to take into account the characteristics of rock layers crossed. Classification of boring tools is based on the geometry of the teeth and depends on the hardness, the abrasiveness of rocks as well as their hydraulic system, but it is better to classify them according to the working conditions with a coefficient designating a discriminant. This is called physical characteristic of the drilling tool. The goal is to designate each element of the tool by a coefficient. Results were obtained from laboratory tests. Modeling the initial rate of progress by different types of tools allowed us to determine an adequate mathematical model of the speed initial progress in clean conditions. Using experimental data and statistics we have established the mathematical model of the average speed of progress as a function of time. With these equations we can determine the wear evaluation and analysis of these factors as an approach to classification according to their characteristics. The main equations for the selection of drilling tools will be based on the optimization of drilling parameters for each type of tool. After analysis, we choose the tool that gives a better forward speed with an optimal load and axial rotation.

Aug 1, 2013

By R. J. Smyth

A Steel Compression Reinforcement Repair Technique (PetroSleevel) system has been developed that has the ability to repair pipeline defects such as stress corrosion cracking (SCC) without requiring welding to the operating pipeline. The Technology has been used to repair active cracking in ERW seam and cracking in the pipe body. All repairs were performed while the pipeline was in operation. This paper will discuss the engineering theory, testing performed to verify the engineering theory, and examples of actual sleeve installations.

Jan 1, 2005

By Paul W. Richardson

"Introduction And AcknowledgmentsTHIS PAPER outlines the geology and discusses the geological problems of the Mindamar mine. It is impossible to acknowledge the contributions of ideas of all the geologists who have worked in the area. Among the more important contributors are K. DeP. Watson, W. S. James, B.S.W. Buffam, and L. J. Weeks, and John MacPherson, the resident geologist at the mine.A mineralogical and chemical study of the ore and country rock is being carried •on by Dr. Watson at the University of California, Los Angeles.General InformationThe Mindamar mine is on Cape Breton Island, forty miles south-west of Sydney (Figure 1). The nearest railway stations are at St. Peters, which is thirty-two miles southwest of the mine, and at Sydney. Good gravel-surfaced roads connect the mine to the railways.The mine is producing at the rate of 600 tons a day of ore containing zinc, lead, copper, and minor amounts of silver and gold. At the present time the mill feed averages 9 .per cent combined metals, of which zinc makes u:p 7 1per cent and lead and copper each 1 per cent.General GeologyThe ore being mined ,by Mindamar occurs in a shear zone parallel to a northeasterly striking, vertically dipping, series of rocks consisting of rhyolite tuff, rhyolite, minor more basic flow rocks, and diorite (Figure 2). In the vicinity of the mine, these rocks have been termed the Mine Series. They belong to the Bourinot group, which has been assigned by L. J. Weeks to the Middle Cambrian. At the latitude of the mine, the Bourinot group is bounded on the northwest by the Stirling fault and extends eastward for two miles."

Jan 1, 1953

By A. A. Sizikov, V. A. Sizikova

Key parameters to consider for any producer: bring down production cost and lead time; Lean production as a tool to achieve maximum efficiency; How to implement lean principles: discontinuous vs. continuous production (aluminum industry); About RUSAL: global top-three aluminum producer; Lean tools at use at RUSAL's production facilities; Pull system, Standardization of work, Just in time, Continuous improvement, Customer-Supplier relations, etc.

Jan 1, 2006

By R. B. Roberts, A. L. Mular

A simple way to determine the IEP of oxide minerals is described. The method is shown to apply for fine powders of Fe203 and ZnO. The IEP lies at pH 6.95 for Fe203 and at pH 9.08 for ZnO.

Jan 1, 1966

By R. A. Ford

The paper outlines: methods used for the determination of wear metals in motor and transmission oils; contaminents in motor, transmission and crusher lubricating oils; and viscosity determinations. Case histories and costs are presented to illustrate the value of an oil analysis program. Introduction NORANDA MINES LIMITED (BELL COPPER DIVISION) is located on the shores of Babine Lake, approximately 450 miles north of Vancouver, British Columbia. Access to the mine is by road from Topley, B.C., about 40 miles away. When a preventive maintenance analysis program was first considered, it was obvious that if samples were to be sent out for analysis, results would not be available for at least a week, due to the distance from any commercial laboratory. The assay laboratory was asked to investigate the possibility of determining wear metals on site. A limited program was started soon after production commenced, and this has now grown to include all large mobile equipment as well as crushers and grinding mills. The laboratory also now determines viscosity, fuel dilution, dirt and abrasives, glycol and water. All these results are ready within two days. This paper will outline the methods used, data interpretation, several case histories and the benefits from such a program.

Jan 1, 1977

By M. J. Lopatka

This paper presents the results of field test and theoretical analysis driving resistance articulated 4x4 tracked robot test-bed. Tests were made on four different grounds. Designated elastomeric tracks resistance coefficients are much higher than for steel tracks. This information was important for the proper estimation of energy consumption in the process of driving.

Aug 1, 2013

By T. -W. Hong, Y. Son, S. -J. Hong, D. Choi

The characteristics of indium-tin-oxide (ITO) nanoparticles recovered from TFT-LCD panel scraps were investigated. The ITO was separated from TFT-LCD panel scraps by dissolving the color filter layer located between the ITO layer and the glass substrate. The solution was filtered to separate the ITO from the color filter component, and the filtered ITO was dissolved in the acid solution. ITO nanoparticles were then precipitated with ammonium hydroxide and organic dispersing agent, followed by heat-treatment at 600 °C. HRTEM, EDX and XRD analyses revealed that the 20 nm sized particle were composed of 90 % In and 10 % Sn, and were well crystallized to in the (222) preferred orientation.

Jan 1, 2014

By C. J. Clayton, A. J. Haynes, D. A. Hickson, B. Thiele

The Meadowbank Gold Project, formerly owned by Cumberland Resources Ltd. and currently owned by Agnico Mines Ltd., is currently being developed approximately 70 km north of Baker Lake, Nunavut, in the eastern Canadian Arctic region. The Meadowbank Gold Project currently consists of a series of gold-bearing deposits within relatively close proximity to one another, which are planned to be mined primarily as a truck-and-shovel open pit operation using conventional gold milling and extraction. The mining plan indicates that approximately 20 million tonnes of ore will be mined over a mine life of eight to ten years. The operation will generate approximately 160 million tonnes of mine waste rock and about 20 million tonnes of tailings. The site is located in an area of continuous permafrost with mean annual average air temperature of -11°C and average annual precipitation in the range of 100 to 200 mm. Lakes cover a large portion of the site, including some of the ore deposits. The location of the site and the physical environment pose challenges to development. This paper presents some of the designs considered to effectively manage and utilize the waste products of mining at the project. Note that volumes, tonnages, construction concepts, and data presented in this paper are accurate for the time of writing and are subject to change and modification as the project progresses, additional modelling is carried out, and additional data are obtained.

Jan 1, 2007

By STEPHEN V. FORGERON

The Loch Lamond celestite properties in central Cape Breton Island were mined by Kaiser Celestite Mining Limited from 1970 until 1976. Poor market conditions in J976forced operations to cease. Kaiser holdings included the Lake Enon, MacRae and A mac prospects. A total of about 272,000 tonnes of raw celestite have been mined. Celestite deposits are situated in the Loch Lamond Basin, specifically in Lower Windsor sedimentary rocks. Of the five formations in the Lower Windsor Group, celestite is found in the upper four. Celestite in the Enon Formation occasionally replaces shale that separates stromatolitic dolomite columns; elsewhere in the formation it occurs in association with siltstone and gypsum. Jn the B2 Limestone Formation celestite fills pores or grades between limestone and gypsum. It replaces both limestone and silty limestone conglomerate in the Loch Lamond Formation; this limestone is of unusually high grade (60 to 70% SrSO,J for the area. Evidence indicates that the Uist Formation may hold important celestite reserves. Original celestite mineralization probably resulted from evaporation of seawater on mudflats or 'sabkhas'. Secondary mineralization also may have occurred. Strontium ions could have been leached from pre-existing concentrations and overlying gypsum, moved downdip in groundwater and combined with sulphate rich waters to deposit as celestite in porous B2 limestones.

Jan 1, 1984

By H. Ardehali, P. Lind

Many gold deposits also contain significant quantities of deleterious elements such as arsenic. Several biological pathways are possible for arsenic exposure; special care and caution must be used while undertaking metallurgical testwork on ores and concentrates that contain high levels of arsenic. Laboratory precautions pertaining to handling of airborne dust concentrations, necessary personal protective equipment, and effluent treatment are discussed.

Jan 1, 2014

By P. Van Marcke, X. Sillen, G. J. Chen, I. Troullinos, A. Dizier, J. Leysens, X. L. Li, J. Verstricht

"In Belgium, Boom Clay is considered as one of the potential host formations for the disposal of the High Level radioactive Waste (HLW). The URL HADES at 223 m depth at Mol site was constructed in order to study the feasibility of HLW disposal in Boom Clay. Since 1995, the URL R&D programme has focused on large scale demonstration tests like the PRACLAY experiment.The PRACLAY in-situ experiments include a set of three tests: The gallery and crossing test, PRACLAY Heater test and PRACLAY seal test. The main aim of the Heater test is to study at a large scale the thermal impact of a HLW repository on the host rock. The test is housed in the PRACLAY gallery. A hydraulic seal, made of compacted swelling and low permeable bentonite annular ring was installed at the intersection between the heated and the non-heated part of the gallery. The primary objective of the seal is to provide undrained hydraulic boundary conditions for the Heater Test.The PRACLAY gallery was constructed in 2007 and the hydraulic seal was installed in 2010. The bentonite is hydrated by natural and artificial process. The swelling, total pressure and pore pressure of the bentonite are continuously measured and analysed by numerical simulations to get a better understanding of this hydration processes. The performance of the seal is tested systematically by means of gas injection breakthrough tests and permeability tests at interface bentonite / Boom Clay and in the Boom Clay around the seal.The PRACLAY Heater will be turned on at the end of Oct. 2014, since a sufficient seal swelling has been attained to fulfill its role for the PRACLAY Heater test. This paper will focus on the PRACLAY Seal test: How we understand the process behind the hydration of the bentonite and how we test the performance of the bentonite seal."

Jan 1, 2015

By K. Stankiewicz

Projects as regards state-of-the-art mechatronic systems aiming at increase of safety in the mining industry and at improvement of coal production technologies, which have been completed at the KOMAG Institute of Mining Technology, are presented. These projects cover automation, monitoring and visualization systems, systems for implementation of artificial intelligence techniques, and database recording systems. iRIS system for electronic marking, identification, and recording of components of powered roof supports, which was implemented in 31 Polish mining enterprises, is presented as an example of the work directly associated with an increase of operational safety. Specialists from KOMAG, ELSTA, Ltd., and Silesian University of Technology in Poland, have developed flexible, configurable, and scalable system for data management, which refers to all fixed assets of mining enterprises, meeting the requirements of users as regards marking and identification of fixed assets. The system for control of roadheaders using intelligent algorithms, based on artificial intelligence techniques is also the example of innovative actions. This system aims at increasing the safety and effectiveness of teamwork due to a possibility of remote, semiautonomous operation. Introduction of artificial intelligence technology enables adaptation of roadheader mining system to the present mining-and-geological conditions. Moreover, work aiming at implementation of state-of-the-art system for control of mine jig?s beneficiation node, integrating machines and equipment in one system, is carried out as regards automation, information integration, and visualization in coal beneficiation process. Work on recovery and conversion of thermal energy, which is a by-product during operation of machines and equipment, especially mine diesel drives, is presented. Systems for energy recuperation are more and more important due to the necessity of continuous increase of power production efficiency.

Aug 1, 2013

By Edmond Chow

Shovel bucket blast fragmentation analysis is an alternate way to assess blast performance and its effects on downstream mining processes. A camera is installed on the boom of cable shovels, and the stick of hydraulic shovels. Images are captured automatically as the shovel digs, and are processed to acquire rock size information. The automatic data acquisition makes this method safe to use with minimal manual labour. It also allows for a large set of sample data to be captured from both the surface and the interior of a bench face. The system has been deployed in several mines to provide an objective assessment of blasting performance. Images are captured from their cable or hydraulic shovels. The images are grouped into sets based on the shovel location and time to match the fragmentation to specific blasts. Blast fragmentation reports are created for each blast after reviewing the results. Measuring blast fragmentation from the shovel bucket proves to be an effective alternative for blast performance assessment with unique advantages. The blast fragmentation information has been valuable to the mines, and the mines have begun adopting it into their operations.

May 1, 2011

IBI Alliances ? Government ? People ? Academic ? Associations ? Media ? Customers ? Agencies ? Shareholders ? Industry consultants ? Investment Authority ? Geological Survey ? Department of Mines ? People ? Local Residents ? Mineworkers ? Academic ? University of Guelph ? Uganda Vermiculite Institute ? Associations ? TVA ? Organic Certification ? Media ? Canada ? International ? Customers ? Advocacy role ? Agencies ? Regional International

May 1, 2006