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By Andreas Oberrauner

Content ? What is? an introduction ? Crushing technology ? Conveying in pits ? Pit-exiting strategies ? Mine Planning in IPCC ? Summary/Conclusions EHS slide ? Sandvik?s objective is zero harm to our people, the environment we work in, our customers and our suppliers ? Current EHS-figures will be added in August! Who is this? Andreas Oberrauner ? Born in Austria ? Living in Cologne (Ger) ? Mining Engineer ? Montanuniversitaet Leoben (Austria) 2000-2005 ? PhD on Mineral Processing 2008-2012 ? Sandvik Mine Planning Department ? Main task: Provide practical and efficient solutions for mining-challenges

Aug 1, 2013

A study was made of zircon powders bonded with phosphoric acid or aluminium orthophosphate. The influence of strength of solution of the phosphatic binders on the modulus of rupture over a temperature range was investigated. Physical properties of three grades of zircon powder bonded with phosphatic binders were studied at various temperatures. Examination of x-ray diffraction data indicated that phosphates ofzirconia are preferentially formed to phosphates of silica. However, zircon in the presence of excess phosphoric acid also forms phosphates of silica upon heating.Resistance to attack by slags from blast and open hearth furnaces was determined on phosphate-bonded zircon mortars in a cup test with industrially made ladle bricks. Zircon powders bonded with phosphates proved to have high P.C.E. values. The first satisfactory results of a plant trial with phosphate-bonded zircon mortar, used in a steel ladle, are now being assessed in larger scale industrial tests prior to accepting the mortar as a steel plant refractory.

Jan 1, 1972

By Gustavo Encarnación

La unidad minera aurífera Santa Rosa, situada en el paraje Pampa Larco, Provincia Santiago de Chuco, región La Libertad, desarrolla un circuito de producción a través de COMARSA, donde se optimiza su proceso en forma dinámica. Así, en el caso puntual de Operaciones Mina-Equipos para el proceso de “carguío y acarreo”,el área de Tecnología de Información y Comunicaciones-TIC, presenta una alternativa de solución a la necesidad, desarrollando un sistema de control, cuya implementación no demanda mayor tiempo y es aplicable al control interno de la unidad con la dinámica que exige “tener la información en campo en tiempo real”. En ese sentido, el el presente trabajo señala el uso de moviles wireless en las pequeñas y medianas empresas mineras como el sistema “Personal Digital Assistant-PDA en control de carguío y acarreo”, que combina la tecnología Wireless en computadoras de mano con la característica de operación de COMARSA. El objetivo es capturar datos de cada frente de trabajo, de cada flota, registrar todo evento de interés que optimice y garantice la calidad de la operación ydel proceso, esta data en tiempo real debe entregar información al Jefe de guardia para el control respectivo.

Sep 19, 2006

By Dave Marsh, John Goode, Niels Verbaan, Kevin Bradley, Henrie Notzl

The mineralogy of the Avalon Nechalacho deposit is complex with significant fractions of HREEs, Zr, and Nb found in refractory minerals such as zircon and fergusonite. Sulphuric acid baking followed by water leaching can be used to extract REEs from flotation concentrates, but acid baking does not completely "crack" the zircon and fergusonite, so the extractions of Zr, Nb, and HREEs are not high. An alternative flowsheet has been developed that is able to obtain significantly improved extractions of HREEs, Zr, and Nb from flotation concentrates or acid bake residues. This is accomplished by cracking the zircon and fergusonite minerals with caustic soda at high temperatures, followed by water washing to recover excess caustic soda and soluble sodium silicates and phosphates. REEs, Zr, and Nb in the solid residue can then be solubilized with HCl or H2SO4. This paper highlights some of the findings from an extensive laboratory program and discusses several flowsheet implications.

Jan 1, 2014

By S. McGinn

The Brunswick Mine Diesel Particulate Filter Study was one of several research projects initiated by the Diesel Emissions Evaluation Program (DEEP). The study was carried out at Noranda?s Brunswick Mine in Bathurst, New Brunswick by Noranda Technology Centre and Brunswick Mine personnel with the collaboration of Natural Resources Canada - Canada Centre for Minerals and Energy Technology (CANMET), National Institute of Occupational Safety and Health (NIOSH), Andreas Mayer of VERT, and diesel particulate filter (DPF) system suppliers. The study began in early 2000. Field evaluations continued for 20 months. The final report?authored by Sean McGinn?was submitted to DEEP in the Autumn of 2003.

Jan 1, 2004

By Carlos Virrueta

"El presente texto señala la importancia del comportamiento seguro en el sistema de riesgos aplicados al comportamiento de los trabajadores, salud y medio ambiente para así establecer los lineamientos yresponsabilidades requeridos para realizar el programa de Auditorías de Comportamiento Seguro, fortalecer el compromiso visible de liderazgo de los equipos de trabajo, así como crear y fortalecer en las personas el hábito de la prevención de los riesgos."

Oct 21, 2015

By Janet M. Epps

The international climate regulating environmental management in mining is rapidly evolving through the combined influences of the development of international guidelines, resolutions, protocols, treaties and conventions; the influences of the international lending and aid institutions who seek a consistent but constantly evolving standard of environmental performance from their clients; the legal precedents being developed in courts al over the world; and the activities of multinational countries who tend to rapidly upgrade technological performance through their international activities (particularly influencing developing countries). In this rapidly evolving regulatory environment, the more 'models' available to this international pool of resource materials that demonstrate practical. cost-effective and (most desirably) incentive based regulatory mechanisms, the better will be the eventual body of 'international standards' we will al have to work with. Australia can make a significant contribution to this process, however, it has only been on the margin of this dynamic, North American and European led process, up to this time. It is in the Australian minerals and energy industry's best interest to take an active part in the evolution and direction of this process.

Jan 1, 1996

By Patrizia Pereyra, José Rau, Maribel Guzmán

Las actividades mineras generan residuos que pueden impactar el medio ambiente y la salud humana. En Perú, la industria minera es una importante contribuyente al crecimiento económico del país, pero también genera una cantidad considerable de residuos. Este estudio investiga la geopolimerización de los relaves mineros de una mina de cobre a cielo abierto en Cajamarca, ubicada en el norte de Perú, como una solución sostenible para la gestión de residuos.

Sep 29, 2023

By Clyde Sitterud

Presentation Agenda ?Global Mining Tire Demand ?What is driving it? ?Latest Situation ?How long it will last? ?Michelin?s Response to Increase Supply ?New plant ?Additional presses ?Recommendations for Mining Users ?Treat tires as your major assets ?Areas of attention that will produce immediate results

Jan 1, 2005

By P. Pyykkö, E. Peuraniemi, J. Järvi, P. V. Latostenmaa, V. Törölä, S. Junnikkala

"Nickel concentrate smelting started in Harjavalta in 1959. First, flash smelting - Peirce-Smith converting route was applied, and the high-grade converter matte was further refined to nickel cathodes. In 1995 the original smelter flow sheet was simplified with the novel DON (Direct Outokumpu Nickel) technology. In Harjavalta with the DON technology, high-grade nickel matte with low iron content is produced in flash smelting furnace directly without subsequent converting stage. The metal values in the smelting slag are recovered in an electric furnace as an iron containing bottom alloy. Main special features in Boliden Harjavalta nickel smelter are smelting of high-magnesia concentrates, the high recoveries of nickel and copper, as well as those of PGM`s and cobalt.Sulfur and dust emissions to air can be seen generally as one main disadvantage of nickel smelting operations. In Harjavalta continuous improvements in environmental performance has been rewarded by minimum sulfur and dust emissions to the environment and working atmosphere. Today Boliden Harjavalta’s nickel smelter is presenting state-of-art-technology at nickel smelting.This paper describes the nickel smelter process and includes recent production and emission data. It describes features required to achieve environmental and occupational hygiene goals and compares environmental performance data to that published on other smelting operations. General description of New Boliden Way is presented and a case example of production stability project is also presented."

Jan 1, 2014

By A. J. WADHAMS

THE relative importance of things is a fascinating subject for thought. As we look about us we realize the Creator of all things has provided the metals for our use, each in the quantity needed-iron in vast quantities gold in small quantities. Had gold been given us in the quantities of iron, the mechanical age mould Eave been very different. You may find some pleasure in running over in your mind this question of the quantity available of an element and man's need of it in the scheme of things. Nickel in this sense is a middle group element. It was not essential to man's early development. Its usefulness dates back only about one hundred years. The quantity available to man has increased as his needs in- creased. On two occasions more nickel became available than was needed and on both of these occasions the ex- cess was soon absorbed by new and useful developments.

Jan 1, 1929

By R. E. Collom

The commercial development of petroleum and natural gas fields has reached its present status within 60 years and is still considered by some operators to be "100 per cent wildcatting." 1 A tendency to drill for gusher production, the production that yields big returns in spite of any mechanical defects in drilling methods, has frequently caused drillers to pass by oil-bearing strata of comparatively small yield and actually to overlook rich oil zones in proved fields; in addition, whole fields have been ruined by water because development methods were never carried beyond a hole-in-the-ground stage.2 Unfortunately, the petroleum industry has no mine dumps or tail. ing piles as at metal mines to yield fortunes through later and bette!' methods of treatment. The wasted oil and gas are gone, as are the time, money, and effort wasted in ill-advised or haphazard drilling. Probably as production costs increase less oil will be wasted, but the need to develop and produce from sands of low yield will become more urgent with the increase in consumption of oil and the decrease in supply. Hundreds of wells are producing steadily as the result of months and perhaps years of careful prospecting and of tests during drilling. The Bureau of Mines has studied the testing and drilling methods used at such wells, and presents in this paper a criticism of these methods and suggestions on future work. The term pr08- pecting here means correct identification and measurement of strata as they are exposed by the drill. The term testing means the determination of the kind and amount of fluid stored within the pores or crevices of any stratum exposed in the hole.

Jan 1, 1922

By Mani Manimaran, Inna Dymov, Mariam Melashvili, Chris Fleming, Joe O’Day

This paper presents experimental evidence that supports the use of bromine/bromide as a potential alternative to conventional cyanidation for gold leaching. The study evaluated a brominebased lixiviant, Stabilized Bromine, with considerably lower vapour pressure than liquid bromine. Using a rotating device, the rate of gold dissolution was determined at various concentrations of this reagent. The reactivity of pure pyrite, arsenopyrite and chalcopyrite minerals was also evaluated in stabilized bromine reagent. Furthermore, bromine leaching of gold in a number of gold bearing ores was undertaken. Results showed that significantly higher gold recovery can be achieved with bromine than with cyanide when leaching gold encapsulated in sulphides, but bromine consumption was high owing to simultaneous oxidation of the sulphides. The greatest promise for the bromine leach process was with oxidized gold ores. The recovery of gold from oxide ores with bromine was comparable to that achievable with cyanide and bromine consumption was reasonable when leaching was conducted at a near neutral pH of ~6. In the case of oxidized gold ores containing copper mineralization, it is possible that bromine consumption may be lower than cyanide consumption, since there is evidence to suggest that bromine is less reactive than cyanide with copper minerals.

Jan 1, 2014

By Medardo Echegaray

Desde el punto de vista de análisis químico se buscaba estudiar un método de determinación de fierro que ofreciese una buena precisión en una zona de concentraciones. En ese sentido, el presente texto señala la determinación colorimétrica del fierro a través del método de complejo aceto-férrico. No existe intlerferencia por el manganeso, fluor o níquel. El cromo interfiere cuando se encuentra en cantidades mayores a su máxima concentración permisible o sea 0.1 mg .

Mar 1, 1963

By Mary S. Esfandiary

This is a revision of a directory of coal research organizations throughout the world that was first published in 1961 as Bureau of Mines Information Circular 8008. Because of the wide acceptance of the first edition, a revision which would supply up-to-date information on coal research and which would facilitate communication among organizations of similar interest seemed important. This compilation includes the names and activities of organizations of various types-government, university, private, and industry. The areas of investigation that each organization is engaged in are indicated in broad terms: Analysis and constitution, mining and geology, preparation, briquetting, combustion, high- and low-temperature carbonization, gasification, conversion to solid and liquid fuels, and health and safety. Publications issued by and describing the work of each organization are cited; almost all of the organizations also publish results of their investigations in the technical press. Selected technical and trade publications that publish information on the science and technology of coal and are not published directly by any of the organizations listed are cited in the pages following the list of organizations in each country.

Jan 1, 1966

By Heather Lechtman

El presente texto señala una de las técnicas metalúrgicas utilizadas por los artesanos de América Precolombina (Colombia, Ecuador, Perú): el dorado. En el caso del Perú, uno de lo períodos de mayor producción metalúrgica y de fabricacíón prolífica de objetos metálicos fue durante el florecimiento de la cultura Chimú. El procedimiento utilizado fue el "dorado por eliminación" donde a través del uso de aleaciones, el oro era deliberadamente incorporado como un componente menor. Asimismo, se emplearon otros métodos del Dorado que van desde una delgada hoja de oro (mise-en-couleur) hasta el más complejo empleado por la gente de Esmeraldas y conocido como "dorado por fusión".

Sep 1, 1975

By Lachezar Tsotsorkov

Corporate social responsibility Is a principal trend of the corporate strategy for sustainable development of Assarel-Medet JSC ? the largest Bulgarian company for open pit mining and ore processing the production activities of which date back to 1964. Sustainable development Social responsibility is considered as one of the three pillars for sustainable development, together with the economic and environmental responsibility.

Aug 1, 2013

By H. Zhu, Y. Sato, O. Takeda, K. Nakano

Recycling of rare earth magnet wastes is essential to insure the stable supply of rare earth resources. For the development of a novel recycling process, the removal of rare earth oxide from an off-spec alloy magnet was investigated by melting the alloy magnet at 1503 K together with fluoride flux, LiF-50 mol% NdF3 and LiF-?25 mol% NdF3-25 mol% DyF3. After melting, the separation of magnet alloy from the fluoride flux was achieved, and neither suspension of alloy in the flux nor suspension of flux in the alloy was observed. Oxygen concentration in the alloy decreased from 5000 mass-ppm to 160 mass-ppm by utilizing 1.5 times of equivalent amount of flux needed to completely dissolve the oxide. The investigated process is suitable for mildly contaminated waste such as a used (end-of-life) magnet because of its simplicity, low energy consumption and small limitation on location for operation.

Jan 1, 2014

By I M. Turnbull

QMAP (the Quarter Million Mapping Programme, 1:250 000 scale) is a geological mapping programme which will build a digital geological database of the whole country and publish maps and books to document it. The programme was established in 1993, following a recommendation by a review panel appointed by the Ministry of Research, Science & Technology, and is funded by the government, from the Public Good Science Fund. The relevance and fundamental value of QMAP lies in the greatly improved geological knowledge it will provide for researchers and other end-users of geological information.   QMAP research involves assessment of previous work, field and laboratory investigations in key areas, and data storage, manipulation and publication using Geographic Information Systems (GIS) computer technology. The QMAP digital database of New Zealand geology will be completed by 2006, as will the series of 21 full colour printed geological maps and accompanying explanatory texts. Two are already completed and published (Kaitaia and Dunedin), and six other projects are well advanced.   QMAP information will also be available in digital form. Next year we hope to expand the scope of the programme to cover the reconciling and linking of many other earth science databases to QMAP, because we believe this will create a powerful research tool. The intention is to develop internet access to the databases, to make the information publicly available.

Jan 1, 1997

By James Ransford Dankwah

This work investigates the effect of waste plastics addition on the reduction of iron oxide by sawdust. Composite pellets of iron oxide containing sawdust (SD), high density polyethylene (HDPE) and blends of SD/HDPE were fired under argon in a horizontal tube furnace at temperatures between 1300 and 1500 °C. Reduced samples were weighed after 10 minutes of reduction and the extent of reduction was calculated from the measured oxygen contents of the compact. The results showed improved extent of reduction when SD was blended with HDPE. The highest extent of reduction was achieved at SD:HDPE ratio of 2:3.

Jan 1, 2014