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By Todd Hamilton

For mine closure, the prospect of treating mine drainage in near-perpetuity can be onerous – especially when flow rates are high. One closure option is to construct tunnel plugs within the adits to flood the mine and reduce discharge volumes. Flooding reduces oxygen access within the mine and hence ARD potential. It also reduces hydraulic gradients such that uncontaminated groundwater is not drawn toward open, acid-generating areas of the mine/orebody. Evaluation of the technical and economic feasibility of permanently sealing mine tunnels necessitates detailed hydrogeological and geotechnical investigations. The capital costs associated with tunnel plugs may be relatively high, and there are ongoing maintenance requirements, risk of significant leakage and even risk of catastrophic failure if improperly designed or constructed. In this sense, the paper point put the means available for assessing the liabilities associated with adits at project start up, and the options available for closure of existing adits to reduce long-term environmental liabilities.

Sep 12, 2005

By Yhonny Paul Ruiz Dioses

El control de leyes es un proceso que determina las zonas económicas durante las labores de explotación minera. Para calcular los recursos geológicos que pasan a ser reservas y pueden ser explotadas con beneficio económico, se requiere de estudios que delimiten los volúmenes de mineral que serían enviados a la planta para su tratamiento. En ese sentido, el presente texto señala cómo el software minero RecMin puede beneficiar al área de control de leyes, muestra las funcionalidades que posee RecMin para manejar la etapa de producción y refiere la importancia del control de leyes y la implementación de un sistema, ya sea comercial o free para su ejecución.

Apr 1, 2014

By Emmanuel Portilllos

Every paste backfill system is typically unique, this being due to the particular tailings characteristics, the backfill recipe and requirements of mine planning. Key to successful transport to the underground workings through the boreholes and the distribution pipelines is the quality of cemented paste, being free of lumps and recipe components uniformly mixed. Certain types of mixer require that the mixing environment is required to be intensive as possible. In this sense, the present paper point out some of the general aspects of paste plant design, a short discussion on paste recipe and process equipment, followed by a technical comparison between a batch mixing and a continuous mixing process, currently applied to the production of cemented paste tailings for mine backfill.

Sep 9, 2007

By Abrahan Barriga

The present study demonstrates the feasibility of the ultrafine grinding and atmospheric leaching process applied to refractory gold concentrates from Salave Project located in northern Spain. At bench scale, it was found acceptable sulfide oxidation was about 84-85% and CIL gold recoveries between 95-96% applying specific energy consumption between 30 and 60 kWh/t during ultrafine grinding. The atmospheric oxidation of the sulfide concentrate was controlled between pH 4.4 and 4.8 with a mixture 90/10 of CaCO3/NaCO3 with residence time of 48 hours for the atmospheric oxidation and 30 hours residence time for the CIL process.

Sep 30, 2022

By Egonk Arriagada, Brindel Barzola, Peter Leckie, Greg Zwolak, Gilmar Guzmán, Germán Chen

Newmont’s Yanacocha operation in Peru presented an especially challenging environment for reliable cyanide measurement and control, processing 3 semi-distinct complex ore types with feed Cu ranging from below 250ppm (as CuCN) to more than 5000ppm, and feed S ranging from low to 5%, resulting in cyanide consumption from as low as 1.5 kg/t to as high as 3.1 kg/t, and gold recovery ranging from approximately 57% to about 78 % (average plant performance based on the type of ore). A literature search by the authors to identify a method for accurate cyanide determination that was also suitable for automation settled on the work of Breuer et al (2011) as a basis. Early challenges in adapting the laboratory technique for the ‘real solutions’ and the range of variability experienced in the plant are discussed, as are other operational challenges due to the complex and changing solution chemistry.

Sep 30, 2022

By Walter Estrada, Fernando Valencia, Jaime Luyo

La gasificación por plasma es un proceso térmico a alta temperatura en el que los desechos se descomponen en elementos fundamentales y compuestos simples en un entorno anaeróbico. El sistema presentado en este artículo actúa como un digestor al transformar las moléculas de carbono y otras sustancias en compuestos menos contaminantes. Se utilizó una mezcla de cianuro disuelto en agua como muestra de ensayo —procedente de aguas de una mina—, que se sometió al componente radiante de plasma, y se estudió la energía generada actuando sobre la purificación y transformación de las muestras.

Sep 30, 2019

By Gilberto Yanarico Apaza

"El presente texto señala las pautas necesarias para realizar una evaluación técnica integral de la influencia del collar de bolas para las operaciones de molienda, afectando al desgaste de los revestimientos de los molinos convencionales. Para la determinación del collar de bolas es necesario realizar los análisis granulométricos con la finalidad de obtener el F80 y el P80 de las muestras obtenidas en la alimentación y producto de los molinos, definir el índice de trabajo (Wi) y consumo de energía. Asimismo, se debe considerar el porcentaje de la velocidad crítica, las dimensiones de los molinos, la densidad de los medios de molienda (bolas), el porcentaje de la carga de bolas, las características geométricas de las bolas para molienda y el diámetro real de bolas, que influye de forma inversamente proporcional en la tasa específica del consumo observada."

Jul 1, 2015

By Jennifer J. Swenson

El presente texto describe los problemas de deforestación, precios e importaciones de mercurio en la minera artesanal aurífera de Madre de Dios. En ese sentido, a medida que la interconexión de la economia mundial avanza, es más difícil que países en desarrollo aprovechen las fuerzas lucrativas de la demanda global para lograr una sostenibilidad social y ambiental. En consecuencia, los países en desarrollo contienen un peso ambiental desigual en relación con los países desarrollados qie importan materias primas. Como ejemplo de ello, el precio del oro aumentó, así como la minería aurífera informal y no industrial en los países en los países en desarrollo y el mal manejo del mercurio en el uso del oro, repercutió en el medio ambiente y los mismos mineros, al igual que el problema de la deforestación. Por ello, se plantea un programa para enfrentar dchos problemas en la región de Madre de Dios y reducir el aumento de la minería informal.

May 1, 2012

By David Sutherland

The treatment of a complex orebody requires a thorough understanding of its mineralogy. If there is a poor appreciation of the mineralogy involved, difficulties can emerge with the efficient exploitation of the resource. Recently, there has been a lot of interest in automated image analysis systems, which aim to improve the reliability and accuracy of the data, which can be gathered. In this sense, the paper point out the process mineraloggy for complex ores. Mineral modal analysis a description of texture and liberation studies are the basis of these measurements. They have been applied to a wide range of mineral systems including copper, lead, zinc, silver and gold.

Sep 13, 2001

By Leonard Waspe

El presente texto describe la aplicación de las prueba del molino Aerofall en la explotación del oro donde existe una reducción en los gastón de operación de la planta y el beneficio de demandas menores por medio de la operación de la planta de reducción sobre la calidad del trabajo.

May 1, 1957

By Héctor Velásquez, Kellyn Cristóbal, Deivy Ríos

La minería como actividad económica busca un beneficio y además sostenibilidad en el tiempo y en ese sentido maximizar la extracción de los recursos agotables con el mayor margen posible es una tarea constante. El presente trabajo considera dos conceptos fundamentales para lograr el objetivo planteado, el cut off mínimo siguiendo las teorías de leyes de corte desarrolladas por Kenneth Lane y Jean-Michel Rendú y el VPN de los flujos de caja descontados como indicador de valor comparativo

Sep 29, 2023

By Oswaldo Bustamante

El presente texto describe los resultados de medición de energía libre superficial a través del Microscopio de Fuerza (MFA) y su relación con la hidrofobicidad y posterior flotación de partículas de oro. Para ello, se evalúa la adsorción específica de los colectores sobre partículas de oro, el cual permite medir la diferencia de energía libre superficial y su relación con la recuperación del oro en la flotación espumante.

Nov 1, 2014

By M. I. Freeman

This paper point put if the companies will considerate large- scale mining in South Américan in the future. In this sense, the philosophy of an international mining company means that the company and the country working in the partnership and they can convince the outside world of the creditworthiness of the project. The mining company would be considering the account metal requirement in the future, the code of behaviour, the obligations and the rights among the employees, the shareholders, the customers, and to the State in wich its work. However, is not specially tailored philosophy for South America. The most important is the satisfactory agreement can be reached even with governments whose domestic laws preclude equity participation by the mining company.

Nov 20, 1969

By T. L. Gibbs

The paper describes the role of the State in the general regulation of the mining industry in the Republic of South Africa as well to refer briefly to some modern technological aspects in South American gold mining practice. In the same way, the paper categorizes it geographical, historical, the mineral and mining laws, lease consideration and taxation, the department of mines, atomic energy board and modern practices in the gold mining industry.

Nov 20, 1969

By Eleonardo Lucas, Christ Barriga

The use of saline water, a product of the sea water osmosis process, for the processing of the mineral from the Bayovar Mine in Peru, is part of the process of final disposal of the studied tailings. In this sense, this paper presents an experimental program implemented for the correct evaluation of this fine low-density phosphate tailings, the behavior of six solids contents prepared in the laboratory with limits between the range 8.5% to 21% were analyzed. The results achieved, from settling and consolidation tests by hydraulic consolidation test, attested to the effectiveness, in addition to being representative, based on the analyzes and comparisons instituted and the definition of the compressibility and consolidation characteristics of the phosphate tailings of the evaluation.

Sep 30, 2022

By Alfred Goldberg

The paper is founded on the results of an investigation on the softening behavior of a cold-rolled low carbon steel. This specimen, originally cold rolled 15 , 30 , 50 and 75% reduction in thickness, were annealed at several temperatures ranging from 481 to 687ªC. A temperature-time range was encountered over which strong competition between these processes was evident. An interpretation on the effect of test variable on determining which one of the competing processes dominated during annealing is presented.

Jul 20, 1961

By Jeffrey Hedenquist

The Lepanto and Victoria epithermal deposits contain in excess of 8 Moz Au, associated with massive enargite-cemented breccia and quartz-carbonate-base metal veins, respectively. The two deposits are separated by 500 m, but the latter was not discovered until the former was nearly mined out. The sulfid assemblages of these adjacent deposits are characterized by high- and intermediate-sulfidation states, respectively. However, gold was introduced after enargite at Lepanto, associated with an assemblage that is similar to that of the Victoria ore. An even larger gold resource is present in similar to that of the Victoria ore. An even larger gold resource is present in the Far Southeast porphyry Cu-Au deposit, the top of which lies 200-400 m beneath and adjacent to these two epithermal deposits.

Apr 24, 2001

By Anna Fonseca

The concept of alteration indicator minerals is presented to aid in identifying the ideal spectral sensor and processing for alteration vectoring. Exploration geologists commonly struggle to understand the technical specifications of remote sensing and field portable spectral systems. This often results in the selection of spectral systems that are inadequate for the metallogenic environment of interest, and in a myriad of processed imagery that rest uninteligible and unused.

May 1, 2008

By R. C. Head

The investigation describe the history of copper in the seventties, as well as indicates the forecast the probable trend of the Copper Industry over the coming decade, and second, to stimulate some discussion on what is a somewhat controversial subject. At the same point, the period of surplus production from about 1972 to 1976-1977, during part of which some voluntary restriction on output maybe necessary. In consecuence, its a necessity for forward planning so that, by 1973-1974, new mines maybe developing to preserve the continuity of supply .

Nov 20, 1969

By Sabina Strmić, Fredrik Sahlström, Siv Hjorth et al

Cobalt is critical for the green energy transition, yet the mineralogical distribution and the mechanisms of concentration of Co in different types of hydrothermal ore deposits remain poorly constrained. Here we document ore mineral assemblages from the active Fåvne and Loki’s Castle seafloor massive sulfide deposits located along the Mohns Ridge in the Norwegian Sea, and determine their whole-rock and mineral chemical compositions with a special emphasis on Co.

May 10, 2023