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By Saúl Gutierrez, Miguel Seminario

El presente artículo presenta las mejoras realizadas en el bobinado de los molinos GearLess Mill Drive (GMD) en Antamina, debido a estrés eléctrico y térmico que están sometidos. Además de ello, este documento tiene como finalidad de compartir la experiencia y los diferentes desarrollos que puedan ser aplicados en otras unidades mineras.

Sep 29, 2023

By C. McAllister, D. Preece, J. Berendzen

The Multiple Blasthole Fragmentation (MBF) model was developed recently and has been reported in previous papers. The MBF model accepts inputs from the blast design, such as: location and orientation of each blast hole, stemming length, blast hole diameter, multiple decking, bench height, initiation sequence, etc. It models the effect on fragmentation of delay timing with its associated scatter for each blast hole. MBF has a statistical modeling capability for geological random variation of the attenuation of particle velocities. Also simulated is wave reinforcement due to the interaction of simultaneously arriving waves or diminishing cooperative contribution from long delay intervals between charges.

Jan 1, 2016

By R. B. Crookston

Oil shales differ from coals in that they contain less carbonaceous material, convertible to volatile hydrocarbons, and more inorganic rock. In all pre-commercial oil shale development, involving extensive full scale mining operations, there have been no explosions. However, large scale mine tests with oil shale dusts by the Bureau of fines showed that propagating explosions could be induced under certain circumstances. Laboratory tests were conducted on a broad spectrum of oil shale dusts to define chemical properties and to seek correlations with subsequently determined fire and explosivity properties. These latter properties, indicative of safety hazards, increased as the Fischer assay oil yield of the dusts increased and as particle size decreased. Laboratory data were used to relate fire and explosivity properties of oil shales to those of coals and other carbonaceous materials and to assist in the identification and evaluation of potential hazardous situations which may be encountered in oil shale mining and processing.

Jan 1, 1978

By Anderson Ayres Bittencourt

O monitoramento de sistemas e ativos de automação sempre existiu de forma rudimentar e descentralizada. A análise desses dados tanto quanto sua obtenção é um desafio para as empresas atuais. Foi a partir deste princípio que nosso projeto foi desenvolvido.Este trabalho tem como objetivo demonstrar a solução de Monitoramento online e preditivo implementada na ArcelorMittal Aços Planos da América do Sul, onde desde o início de sua implementação pudemos capturar benefícios operacionais, melhoria dos processos, otimização, eliminação e/ou diminuição de indisponibilidade de plantas, entre diversos outros retornos que serão apresentados.

Oct 30, 2017

By Joseph Jensen

MANY fields have been zoned by nature with shales and intermediate waters between oil zones. Limitations thus imposed have been the basis on which the field was developed. In contrast thereto, in the Ventura Avenue Field, nature proved more generous. Always expecting to find such similar limitations, operators drilled deeper and deeper into the oil zone without finding any distinctive shale bodies other that the Gosnell shale and only one intermediate water, which became the point below which the final water shut-off of each well was made. Thus, on top of the structure, about 3300 ft. of oil-bearing zone has been penetrated below this intermediate w9ter-a distance of 4000 ft. below the Gosnell shale. At first it seemed that the greater the penetration in the zone, the better the well. The error of this assumption became evident

Jan 1, 1930

By Charles L. Harness, A. T. Coons

Sodium carbonate, Na2CO3, more commonly known as soda ash, is the most important of the alkalies. Sulfuric acid is the only heavy chemical, Soda ash enters the market either as the natural product or as a manufactured derivative of common salt. Notwithstanding their common occurrence in closed basins of the Western States, natural sodas are produced at present by only four firms, all in the same California area, and satisfy only 4 percent of domestic demand for soda ash; soda ash made from salt supplies 96 percent of the requirements. The impossibility in wartime of routing all westbound American shipping through the Panama Cami.l has curtailed Pacific Coast receipts of soda ash and-increased the importance of local resources of natural carbonates. One of the most promising of ·these is the recently discovered trona (sodium sesquicarbonate)· deposit 2o·mnes· west of Green River, Wyo. Reserves are likely to run into hundreds ·of million·s of tons, and the deposit probably could be worked by the room-and~pillar· system of mining, like common salt or coal. • • Raw materials ·ne·cessary for manufacturing synthetic soda ash occur closely associated in m·afiy parts· bf the United 8tates. Almost unlimited resources of salt in brines and in rock-salt depbsits are located near limestone quarries in many areas. The· limesto'ne furnishes the carbon dioxide for the manufacture of soda ash arid the lime f o'r the recovery of ammonia. used in one step of the process. Expansion of the industry to meet wartime needs depends chiefly on availability of trained labor, materials, and equipment necessary for the erection of additional units.

Jun 1, 1942

I. Domestic Production and Use: In 1981, 13 companies operated 32 primary aluminum reduction plants, with 3 firms accounting for 58% of production, Washington, Oregon, and Montana accounted for 32% of the total production; Texas, Louisiana, and Arkansas 16%; Tennessee, Alabama, South Carolina, and North Carolina 17%; other central and eastern States 35%. Based on published producer prices output of primary metal in 1981 was valued at over $7.5 billion. Aluminum consumption by 25,300 firms was centered in the East Central United States. Packaging accounted for an estimated 30% of domestic consumption in 1981, building 21%, transportation 18%, electrical la%, consumer durables 8%, and other uses 13%

Jan 1, 1982

By David Ramírez

"Dentro del proceso de optimizar la fragmentación del mineral por voladura, el principal objetivo es determinar el impacto que tendría la incrementación de las partículas medias y finas sobre la extracción de cobre en elmineral ROM, (Run of Mine), que actualmente constituye una de las fuentes de producción por lixiviación en la Sociedad Minera Cerro Verde. En ese sentido, el presente trabajo describe la cantidad de cobre que aporta el mineral ROM a través de su optimización en el proceso, así como el impacto económico que tendría a futuro. Para ello, se utilizan los resultados de las pruebas para los módulos experimentales 12 y 13 desarrolladas entre 1998 y 2000, y la validación preliminar del sistema de análisis granulométrico por fotos (Split Desktop) desarrollado en julio del 2002 para así otorgar validez a los resultados fotográficos de granulometría reportados para las diferentes pruebas de voladura. "

Jul 31, 2003

By Jorge Quintana S

El texto señala tres métodos que la Ingenieria industrial aplica a la Cerro de Pasco Corporation y por ende, al campo minero. Dicha compañía, fue la primera en utilizar estos métodos a partir de tres ejemplos: Simplificación del trabajo, incentivos para la producción, cambios de maquinarias. Los resultados de la aplicación fueron satisfactorios, demostrando una redución en los costos y aumento en la productividad. Es decir, se bajan los costos de producción a una cantidad considerable al mercado mundial para competir con los minerales producidos en otras países. Asimismo, se genera un beneficio para el personal que trabaja con un índice de productivdad, aumentando las bonificaciones como sus salarios.

Jul 20, 1960

By James E. Parkes

The Silver Spring Transit Center is a new three-level transit center that will include bus loops for County, Metro and intercity buses, parking, and retail space. It replaces an existing bus station and connects to a busy metro rail station in downtown Silver Spring, Maryland. Significant site constraints in both plan and profile had to be dealt with in developing a design for support of the structure. Over 90 rock-socketed drilled shafts ranging in size from 3 to 7 foot in diameter were ultimately used to accommodate the limited space and large column loads, and to adapt to the variable rock surface at the site. Site access during design was limited due to the existing active bus station, so contract documents were adapted to include further explorations. Differences in anticipated and actual field conditions regarding the depth, quality, and variability of the rock had to be overcome in construction. Osterberg Load Cell testing during construction allowed for verification and optimization of the shaft design. Additional issues dealt with on this constrained site in an urban setting included construction staging issues, such as working around specialty contractors for tieback walls, blasting operations for rock excavation, productions issues for hard bedrock, as well as coordination issues with third parties, most notably the Washington Metro Area Transit Authority. Aspects of the foundation design and optimization, preparation of the contract documents to deal with the complicated nature of the project, and lessons learned from construction are also discussed.

Jan 1, 2011

By Federico Oviedo Kernan

El presente trabajo señala un panorama del plan básico de trabajo en seguridad empleado para la Marcona Mining Company, así como los resultados obtenidos a partir de este. Este plan materia se basa en anteriores proyectos propuestos en años anteriores, los cuales han ido modificándose a partir del año 1958, puesto que debido a la magnitud y alcance de los trabajos de la compañía, surgió la necesidad de crear un Departamento de Seguridad.. En la actualidad, dicho área se encuentra en etapa de expansión para así cubrir las necesidades actuales. Los elementos que comprenden la estructuración del plan son: Dirección de la gerencia, asignación de responsabilidades mantenimiento de las condiciones seguras de trabajo y búsqueda de las causas de accidentes, preparación en seguridad, registros de accidentes y estadísticas, salubridad e higiene industrial, aceptación de la responsabilidadtanto de la empresa como del trabajo, así como la premiación y evalución permanentes a los trabajodores de la Marcona Mining Company.

Jul 20, 1961

By David Brown, Dirk van Dyk

Horizontal rotating mills are being used all over the world associated with different mineral and power generation industries. David Brown South Africa, with over 140 years of experience in gear manufacture and design, has been supplying these industries with innovative designs at exceptional quality. The gearing systems associated with these industries are challenged daily with operating conditions with are not always fully understood. Failures are therefore experienced, over time in the industry, which can therefore not always be fully explained. David Brown South Africa has developed a gear monitoring system, the Intelligent Gearing System, in association with Transmission Dynamics (UK), in order to monitor and analyze these operating conditions in real time. The system has been designed on the principles of Six Sigma, incorporating Design for Six Sigma. The purpose with this system design is to monitor the operating conditions on the pinion, record the information and analyze the data in relation to the rate of fatigue damage to the girth gear and pinion. This is done in real time and unattended. The output from the Intelligent Gearing System can be fed back into the operating system of the mill user, in order to display an alarm for operating conditions exceeding the design criteria as well as information on the rate of fatigue damage due to these operating conditions. When the mill operating conditions are better understood, and the effect on the fatigue life of the mill gearing components, mill users can forecast critical spare holding levels with an increased accuracy. The Intelligent Gearing System also allows early actions to remove reasons for system overloads.

Jan 1, 2007

By Luis Alberto Maldonado

En las actividades mineras existen agentes naturales como las rocas alteradas, agua subterránea y la voladura que afectan la estabilidad de macizos rocosos y dificultan la explotación de yacimientos mineros, mientras que los agentes inestabilizadores tales como las condiciones estructurales adversas, aguas subterráneas, los esfuerzos variables, la voladura en las excavaciones y los factores geodinámicos, influyen negativamente durante las operaciones de desarrollo y explotación de yacimientos mineros. En ese sentido, el presente texto señala la influencia de estos agentes y su condicionamiento para la determinación del diseño de las labores mineras y para la explotación, ya sea en las dimensiones, el tipo de soporte, el método de excavación y el drenaje, así como el control de los mismos.

Jul 31, 2003

By Aníbal Gastañaga

En la industria minera, la silicosis se presenta como una enfermedad ocupacional que incapacita total o parcialmente al trabajador labor física, incidiendo directamente en la marcha socio-económica del país, puesto que entre los incapacitados, existe un alto porcentaje de personal calificado, con experiencia valiosa y aptitudes especiales que adquirieron la enfermedad producto de años de trabajo y adiestramiento adecuado. En ese sentido, el presente texto describe los casos de silicosis, monto de indemmizaciones de 1948 - 1966.

May 1, 1968

By Hugo Toledo, Karin Batallanos, Antonio Bravo, Rafael Carpio

Este documento técnico ha sido desarrollado a partir de una perspectiva empresarial orientada hacia la optimización de los recursos y activos con el objetivo de aumentar la rentabilidad del negocio. Para lograr este propósito, fue crucial la apertura y sinergia y entre las áreas de Mina, Planta y Mantenimiento, ya que su interacción conjunta desempeña un papel crucial en la consecución de nuestros objetivos.

Sep 29, 2023

Satellite Image Based Strategies to Evaluate the Impact of Dismissed Mine Site - An Application to the Mae Moh Coal Mine Area in the Lampang Province, Thailand

Sep 13, 2010

By Huw Williams

It is becoming increasingly common practice to re-use existing foundations for new projects, especially on urban sites where geotechnical conditions are congested. A knowledge of the foundation dimensions and capacity is essential for this to take place, however, as-built records are often non-existent. Non-Destructive evaluation (NDE) is now becoming an important tool in assessing old foundation properties and their potential for re-use. Pile dimensions are also critical in the power industry, when they are supporting transmission towers which need to be upgraded, and may carry additional wind loading. This paper describes the application of various NDE techniques that are available and how they can be used to determine pile length, shape and capacity in difficult site conditions, including foundations under structures.

Jan 1, 2006

By Venancio Astucuri

Ante la incompatilbilidad entre las competencias de los ingenieros de minas y las necesidades de mercado, se plantea la acreditación como un mecanismo de solución en la formación de estos profesionales. En ese sentido, el presente texto señala la acreditación académica como mejora en el proceso de formación profesionales de los ingenieros de minas. Las principales brechas son: la escaza preparación de los estudiantes en los cursos de inglés y matemáticas, deficiencia de trabajo en equipo, autoaprendizaje, manejo de Comunicación y la no obligatoriedad de pasantías y permanencia de estudiantes en la empresa en la formación de ingenierios de minas. Las posibles soluciones estriban en establecer objetos educacionales de cada escuela donde se busca resolver problemas de ingeniería utilizando los principios fundamentales de la ciencia, matemáticas e ingeniería de minas, que los estudiantes sean comunicadores líderes con los equipos que participa y poseer una apreciación para la minería como un negocio, y comprometerse en la formación continua y desarrollo profesional.

Jul 1, 2016

By Ingrid Hann

The Triple Bottom Line ? Economic Sustainability ? Creation of Joint Venture companies ? Planned evaluation of other kimberlites ? Social Sustainability ? Impact Benefit Agreement and Participation Agreements ? Education and training initiatives ? Environmental Sustainability ? Environmental management ? Mine closure planning

May 1, 2008

By Rómulo Mucho Mamani

El presente trabajo señala el uso de la tecnología existente en INGEMMET para el servicio de los operadores mineros de pequeña escala, orientados fundamentalmente a la explotación del oro. En este sentido, el uso del conocimiento y de los instrumentos informáticos son elementos que facilitan la difusión de la información geológica para este fin, los mismos que al ser interpretados en laboratorio y contrastadas en el campo, ofrecen resultados de relevante utilidad para la toma de decisiones y coadyuvan al proceso formalizador del subsector.

Sep 12, 2005