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By Otto L. Schumacher

The Overthrust Belt in portions of Montana, Idaho, Utah, and Wyoming, an area that has contributed generously to the Nation's mineral supply, is one of the few remaining oil and gas frontiers on the North American continent. Determination of the oil and gas potential and development of mineral resources of the area have been affected by a variety of land withdrawals and other restrictions, The purpose of this study is to determine the extent of these withdrawals and restrictions and to discuss the mineral resource potential within the study area. Statistics in this report refer to land status on January 1, 1979. At that time, of the 27.3 million acres of Federal mineral lands within the study area, applications tor Federal oil and gas leases for more than 4,4 million acres (about 16 percent) were pending; the average length of time was 2 years. Federal oil and gas leases covering 8.8 million acres were also on record. Although drilling has occurred on some of these leases, others are subject to restrictions that discourage or prevent development. Some in fact contain stipulations disallowing any development.

Jan 1, 1981

By Joseph M. Kurtak

The Bureau of Mines (Bureau) and the U.S. Geological Survey (USGS) conducted a 4-year (1979-1982) mineral assessment study of the Chugach National Forest (CNF), Ak, as part of the Roadless Area Review and Evaluation (RARE II) Program. The USGS remapped the geology and distribution of mineral resources. The Bureau investigated mines, prospects, and mineral occurrences. This report describes the results of Bureau work in the central 790,880 acres of the Forest. Copper, with by-product zinc, silver, and gold, has been the major metal produced from the study area as well as from the entire Chugach National Forest. The majority of the copper deposits are concentrated within basaltic rocks on Knight Island but the major producers are hosted by sedimentary rocks on Latouche Island. Approximately 182.6 million lb of copper, 1.5 million oz of silver, and an unknown but substantial amount of gold were produced during a 30 year period. Currently no mines in the area are producing. Inferred, indicated and measured reserves having mineral development potential total 4.6 million tons, with weighted average grades of 1.6% copper, 0.30 oz silver/ton, and 0.04 oz gold/ton.

Jan 1, 2011

By Peter Amelunxen, Javier del Río, Marcial Medina

Este documento técnico describe las iniciativas de mejora y nuevas tecnologías implementadas en la planta concentradora de la mina Constancia, que permitieron incrementar en forma sostenida los principales indicadores de producción: troughput, recuperación, disponibilidad y utilización. Constancia es un yacimiento de pórfidos de cobre-molibdeno que incluye mineralización tipo skarn, ubicado a 4,100 msnm en los Andes sur-este del Perú, región Cusco.

Jul 30, 2020

By Maurice Hunter

The paper outlines recent design developments in the computerization of surface crawler drills for the quarry industry. It references the technology firstly developed for the underground mining and construction industry, where automation and computerization has been in demand for a number of years.

Jan 1, 2003

By S. Tumionen

El sistema de análisis ha estado en operación en cinco de las plantas concentradoras de la compañía por un tiempo suficientemente largo para realizar un análisis adecuado de los beneficios logrados en el control de los procesos de concentración. En ese sentido, el presente texto describe el analizador en flujo Courier 300 y su experiencia en plantas concentradoras. El primer sistema analizador fue instalado en la mina de Pyhasalmi a fines de 1967 y se divide cuatro grupos funcionales: equipo o sistema de muestre, analizador, equipo de salida y equipo auxiliar. Posteriormente se instalaron cinco sistemas analizadores Courier ( Kereti, Pyhasalmi, Vihanti, Vuonos, Kotalahti), donde se lograron mejoras considerables en el control y economía de las plantas concentradoras. Por ello, el conocimiento inmediato de los cambios en el proceso y la posibilidad de corrección rápida han permitido obtener una producción más uniforme y mayor capacidad de recuperación.

May 1, 1975

By Staff

Introduction As the Sherritt Gordon property is still in the development stage, . it is rather difficult to write a proper account of the mining methods and milling practice that will be used. While the general scheme of operation will remain the same, there will undoubtedly be many minor changes to meet special conditions which we cannot forsee at the present time. Most of the work accomplished to date has followed the usual routine of preliminary development in the Canadian North. However, we have learned a few things which might be of use to others operating under similar conditions. The most important of these is the saving in power cost made possible by the use of Diesels as against steam power when using wood fuel, and the movement of freight by tractors when rail transportation is not available. Location The property i6 located about 90 miles north of The Pas, or 40 miles northeast of the Flin Flon mine. A branch line from Cranberry Portage, on the?C. N. railway, between Flin Flon and The Pas, connects the property with the outside.

Jan 1, 1930

By Katya De la Cruz

El sistema autónomo de acarreo implementado en la operación minera Quellaveco, ha significado un proceso sin precedentes en el Perú y en la corporación Anglo American. El proyecto de implementación se ha desarrollado de manera ordenada con el respaldo de la corporación, además del soporte de empresas socias estratégicas y las gerencias de Operaciones Mina, Mantenimiento Mina y Manejo de la información, que trabajaron y continúan trabajando de manera coordinada como áreas principales para el funcionamiento de la autonomía en mina.

Sep 29, 2023

By Sabina Alva, Luis Ruíz

El Sistema de Manejo de Aguas de Yanacocha se basa en colectar toda el agua de contacto, tratarla y luego descargarla a su cuenca de origen. Esta filosofía, ha mantenido por muchos años el balance hídrico con cero riesgos de eventos ambientales; sin embargo, los últimos cambios climáticos y operacionales, nos han exigido que seamos resilientes y nos adecuemos de una manera rápida y sostenible para poder continuar con la excelencia operacional y cumpliendo los compromisos legales de acuerdo a las normas ambientales nacionales e internacionales referente a la calidad de agua.

Sep 29, 2023

By Mario Samamé Boggio

El presente texto describe la importancia de la minería como actividad económica peruana -en tanto esta contribuye con el 49% de las divisas indispensables para importar los alimentos que faltan y la maquinaria para nuestra industrialización. Asi también aporta a las necesidades fiscales con sustancial aporte, producto de los impuestos, gravámenes y arbitrios que paga la industria extractiva.

Sep 1, 1961

By L. Andrews

Mineralogy, traditionally associated with concentrator studies, is being increasingly applied to problems in pyrometallurgy. Such investigations commonly make use of a number of techniques, and the results are combined for a meaningful interpretation, which can lead to a successful solution for the problem. Mineralogical techniques are described for various pyrometallurgical operations. Examples are given of studies and investigations involving mineralogy in chemical-looping combustion, feed monitoring to platinum-smelting furnaces, and losses to slag in base metal and platinum smelting.

Jan 1, 2011

By Albert Ladd Colby

A GLANCE through the Bibliography appended to this paper will show that the Transactions of this Institute contain what virtually contitutes a history of the development of the manu¬facture of steel rails in this country and abroad. It is, therefore, fitting that this paper, bringing one branch of this important subject down to date, should be here presented, and it is also appropriate to select this joint meeting of our Society with the Iron and Steel Institute to compare the specifications covering the rails produced in these two countries, and to propose a standard specification to govern the manufacture of American rails for export. During the last ten years the production of Bessemer steel rails in the United States and Great Britain has amounted to 32,128,720 gross tons. Nearly 19,000,000 tons have been rolled in the past five years. The next five years will see an even larger output, owing partly to the extension of railway projects in the Orient, in South and Central America, in Mexico, and in Australia and the other British Colonies. Of late years, the American rail-mills have so largely increased their daily output, that trade conditions have often made possible the delivery of American rails to foreign ports. The tenders submitted by American mills, however, have always been accompanied by requests for changes in the foreign specifications, chiefly in the reduction of the amount of testing required; and it has only been natural, especially at first, that the engineer, whose specification had always been accepted without question by British mills, should interpret American tenders 'as an evidence that an inferior rail would be furnished

Sep 1, 1906

By D. Harrington

This paper is a revision of Information Circular 7380, by D. Harrington and J. H. East, Jr., published in 1946, entitled ?Safe Storage, Handling, and Use of Commercial Explosives in Metal Mines, Nonmetallic Mines, and Quarries.? Issued soon after the close of World War II, this earlier circular described the unprecedented increase in the production and use of commercial explosives during the war as a result of expanded industry and the tremendous demand f or metals and minerals. In the years following World War II, the production and use of commercial explosives in the United States have continued to rise. Hence, the Bureau of Mines presents these revised figures through 1952. In rewriting this Wormation circular, most of the text prepared by Harrington and East has been retained, with newer statistical information compiled by Seth T. Reese, Accident Analysis Branch, and V. E. Wrenn, of the same branch.

Jan 1, 1954

By Hal M. Lewers

IN the past few years and especially since the beginning of World War No. 2, gold has attained a new, important. and critical place in the international scene, and in world affairs. In the past, as far back as history records, most wars have been waged for the purpose of acquiring it from someone else by conquest. But now, the most titanic struggle of all time is being waged with the avowed purpose of not only destroying it, but of destroying all that it stands for and represents. A tradition dating back to ancient Rome, affirms that battles are fought by men with weapons, but wars arc eventually won by gold. The validity of that tradition is now being subjected to its major test. Hitler has proclaimed that in his new world order, the work dollar or reichsmark, a beautifully engraved paper currency representing only a theory of value, based on unit of work and production, will become the supreme medium of world exchange, and that gold eventually will he valueless and obsolete.

Jan 1, 1942

By W. Chi, R. Regan, R. A. Washington

"In uranium mines, the purification of underground mine air can be accomplished by the removal of dust particles and radon daughters using filters. Full-scale statistically designed experiments with flow rates up to 10,000 cfm have been conducted at Denison Mines Ltd. on mine air filtration with vermiculite as a filter material. Various filtration bed thicknesses were chosen, with different face velocities through each bed thickness. Results on total dust, respirable dust and radon daughter collection efficiencies were analysed statistically. It is shown that these collection efficiencies are directly related to the filter bed thickness. However, the different face velocities seem to affect only the collection of radon daughters. Optimum collection efficiencies for a clean bed of about 30% were found for respirable dust and radon daughters, and about 41>% for total dust, using an 8-in.-thick bed and a face velocity of 500 fpm. Dust build-up on the filter bed during operation led to an increase in collection efficiency, reaching 40 to 60% after two weeks."

Jan 1, 1973

By Luis Anderson Orna Berrospi

El presente texto describe la función de los robots en la colocación de explosivos -en tanto apoyan el proceso de voladura en la mina o acceden hacia áreas donde es imposible para los seres humanos trabajar o sobrevivir, de forma que utilizan las nuevas técnicas de Inteligencia Artificial. Asimismo, estos realizan tareas operativas en menor tiempo que buscan optimizar el trabajo de los mineros y reducir los costos de producción.

Sep 1, 2015

By D. J. Parker

Because of its convenience and availability, natural gas (and to a much less extent manufactured gas) in being used more generally throughout the country for domestic and industrial purposes. With this use, specific and little-recognized hazards have arisen owing principally to the fact that the public and the consumer lack knowledge of the explosive property of this fuel. During the past 8 years gas explosions hove occurred in public and private buildings with loss of more than 300 lives and injury to many others. Such appalling catastrophes can and will be prevented if and when the necessary precautions are taken in the construction of buildings and the installation and maintenance of gas lines and gas appliances, plus adequate supervisions inspection, and education.

Jan 1, 1941

By Pedro P. Olórtegui F

El presente texto revisa desde 1952 las actividades de Higiene industrial en relación con la Cerro de Pasco Corporation, describe las condiciones ambientales introducidas en la aplicación de la ventilación exhaustiva en las plantas del circuito de fundición de plomo y visualiza las posibles soluciones de Higiene industrial aplicadas a las secciones del circuito de plomo de nuestra fundición. El programa de Higiene industrial de Cerro de Pasco se encuentra en una etapa de evolución donde evalúa el uso de técnicas modernas y los riesgos de las operaciones que puedan representar para la vida de sus trabajadores. En este sentido, se muestra la interdependencia entre el campo de la prevención de accidentes y la aplicación de los principios de Ingeniería de Higiene industrial, lográndose reducir los niveles de contaminación del plomo y la prevalencia de las enfermedades profesionales a través de una campaña de orden y limpieza efectuada por la sección de Higiene industrial.

Aug 20, 1965

By A. V. De Forest

INSPECTION and test methods of great diversity have been used from the most ancient times to select raw material, control its manufacture, and appraise its finished properties and value. The "miller thumb," expert in grading flour, the vintner's sense of taste, the goldsmith's micro-wear test on a touchstone, the enquiring sniff over the doubtful egg -these are all nondestructive inspection methods, accurate and depend- able, but not readily reduced to numbers in the c.g.s. system. A horse trader inspecting a possible purchase is interested in more than age, size, weight, color. heredity, speed, or drawbar pull which can be reduced to figures. Behavior, temperament, stamina, health-past, present and future---are just as important as the numerically determinate constants.

Jan 1, 1940

By Estanislao Dunin

Aunque el Perú disponga de un potencial carbonífero suficiente, no ha logrado posicionarse como principal productor de carbón. Dicha crisis es atribuida al fracaso gubernamental en el manejo de difusión y gestión del carbón peruano. Por ello, el presente texto analiza este problema a través de la tenencia de yacimientos de carbón, entidades nacionales relacionadas con el carbón y así buscar un adecuado fomento de la minería en el carbón.

Nov 1, 1982

By José María Lezcano, Diego Urquiaga, Pedro Delvasto, Marcos Garayar

La extracción de minerales ricos en sulfuros metálicos tiene el inconveniente de generar drenajes ácidos (AMD), los cuales causan severos impactos en los ecosistemas acuáticos, el suelo y el recurso hídrico. Como posibilidad de remediación (alcalinización) de estos pasivos, en el presente trabajo se propone el uso de coproductos férricos oxidados (CFO). Luego de presentar las características de un tipo de CFO específico, se muestran los resultados —a escala de laboratorio—sobre la respuesta alcalina del mismo, y se discuten las implicancias de estos hallazgos para el tratamiento de los AMD.

Nov 30, 2020