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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 Carlos Torres, Albert Cabrejo

For the last 20 years mine slopes have been monitored with slope stability radars. Since 2015 a group of dedicated geotechnical engineers dedicated to remotely monitor radars around the world have detected 2000+ slope failures of different characteristics. A statistical analysis of the information gathered of these failures have been made and the summarized results are presented with some degree of analysis appropriate for the vastness of the database. The analysis considers different types of commodities, countries, mining processes, rock types, and weather conditions.

Sep 29, 2023

By Jan Klein

"The last decade of the 20th century saw the development of one of the last missing geophysical tools for mineral exploration: the Airborne Gravity Gradiometer. It is possible that Airborne Induced Polarization, one of the stillelusive systems, will make its debut in the next few years. In this sense, the paper point out are the most recent and important improvements in geophysical technologies for mineral exploration. Airborne techniques are followed by the systems used on the ground and in boreholes. New equipment and data processing and modeling software are referred to. Brief remarks are made about developments that can be expected in the years to come, these will be mainly focussing on deep search in rugged and conductive terrains. "

Apr 24, 2001

By Zaraí Toledo, Freddy Cáceres, John Hayes, Katherine McKiernan

Facing the rapid proliferation of informal artisanal and small-scale mining (ASM) in the 2000s, states with commodity-dependent economies pursued different strategies to enforce regulations to the activity. This article assesses the effectiveness of these strategies in increasing compliance. We leverage a view of policy effectiveness that considers the type of state-society relations a policy foster. We look at how different state-society relations impact the relevance a policy has to the subject it attempts to regulate. We argue that cooperation helps the state overcome its limitations on the knowledge of ASM and its limited institutional powers to enforce regulations alone. By learning about the activity in question and developing ties with the informal miners, the state can produce feasible regulation that is more likely to be followed.

May 10, 2023

By Scott Elfen

The degree of saturation in leach facilities and waste dumps can be determined by means of this simple test equipment. A design flow rate is applied to the sample, which is equivalent to irrigation and/or the design storm event. In this sense, the paper point out that the tests were carried out on two different ore sizes from the Pierina Gold mine in Peru. The samples were remolded by using three different densities, simulating different depths within the heap. The ore was subjected to a predefined flow rate, which was equivalent to the design irrigation rate. The flow rate was increased to consider the additional effect of the design storm event during irrigation. In the future, further tests will be performed using different ores samples from operating mines and varying different parameters to help built a database and develop other useful applications from this test, such as general guidelines for maximum irrigation rates for leach facilities.

Jul 31, 2003

By Jorge Olivari Ortega

"El presente texto describe el origen etimológico de la palabra oro, propiedades e historia. El término oro deriva del latín aurum, cuya raíz refiere al color, gelb al color y ccori al origen. Este metal amarillo se encuentra en forma dendrítica, es decir, en masas arborescentes, masas redondeadas como pepitas «pepitas de oro» y en forma de escamas o pequeñas lámina. Entre sus propiedades tenemos: el color opaco, brillo metálico, maleable, dúctil sin ningún clivaje y de una fractura áspera y que prácticamente es inalterable e insoluble en los ácidos simples. El grado de concentración del oro en una mena (depósito que contiene mineral aurífero) es medido por la ley (cantidad de oro por tonelada de mena), mientras que su pureza es expresada en quilates. Los primeros indicios del trabajo con el oro en territorio peruano se remontan a unos 1500 años aC. Los primeros buscadores de oro prehispánicos obtenieron el metal amarillo de los placeres o depósitos aluviales, de los cuales se podían extraer fácilmente con la mano, las lentejuelas y las pepitas de oro."

Sep 1, 2015

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 Michael Leslie Connor

The paper point out the services of the london metal exchanged on the mining.The investigation is divided at two parts: the tradings sessions and dealing and delivery dates. As well as, the london metal exchanged serves the world metal trade at large in three ways: a daily market price, a physical market and the insurance against market fluctuations.

Nov 20, 1969

By Sivan Iswaran, Will McLean

This paper details a 2MLD ion exchange water treatment plant which selectively removes arsenic, antimony, iron, hardness, and sulphate from mining water; designed to meet environmental quality indicators such as sulphates. The client, Fosterville Gold Mine Pty Ltd, is owned by Kirkland Lake Gold and is one of the world’s highest grade gold mines. The site located near Melbourne, Australia had identified a risk of reduced mine water storage capacity due to surface run-off and increased sulphate rich dewatering of the underground mine at depth. Clean TeQ Water carried out the project management, process design, procurement, and commissioning for the plant, which was handed over in August 2020.

Sep 30, 2022

By Merrill Steve, Dabrowsli Bartosz, Law Harrison, Taggart Diane, Christodoulou Lance

The capability to enhance flotation performance is a continuous pursuit in the mineral processing industry. Incremental improvements are being pursued by incorporating design changes into established flotation technologies. The industry, however, is demanding advanced technologies to perform better in terms of improved resource utilization while at the same time ensuring that power and water usage is reduced. To meet these demands, it is necessary to make a step change in the performance capability of flotation equipment.

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 Fernando Machuca Pérez

"La minería genera una gran cantidad de desechos de material como lastre, ripios y escorias, que son depositados en un área sin considerar el impacto ambiental que estos producen. En ese sentido, el diseño de escombreras no considera las condiciones ambientales en la industria chilena, y por ello se privilegió el costo mínimo en depositar este lastre sin un diseño que considere esta variable. Por tal motivo, el objetivo general del texto es diseñar los algoritmos de secuencia de llenado de escombreras, considerando las siguientes variables forma, altura, talud y orientación, condiciones meteorológicas y económicas en su diseño, de tal manera que se produzca el menor impacto ambiental por la emisión de material particulado. "

Sep 1, 2015

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 Ron H. Derammelaere

"The paper point out of the copper slurry pipelines in South America, providing key statistics, such as throughput, diameter, length, etc. In addition, it will present technical aspects of pipeline design that are unique tomountainous terrain, specifically: choke stations for the control of slack flow, batch hydraulics, automation and training.The pipelines listed in this paper operate successfully at availabilities in excess of 98%. Breaks and plugs can occur due to operator error, but are extremely rare. A review of cross-country slurry pipeline operations worldwide over the last 30 years shows that such a major event occurs, on average, once every five years. Under such a worstcase condition, the downtime rarely exceeds five days. Some pipelines have already been in operation over 30 years, the life span being a function of how well corrosion is kept in check."

Jul 31, 2003

By Joel Ochoa, Miguel A. Montiel

El artículo da cuenta del estudio de un prototipo de placa de desgaste para chutes de transferencia con un nuevo sistema de sujeción. El sistema fue validado mediante el software Ansys. La innovación no solo está constituida por un nuevo diseño sino también por el tipo de proceso productivo para la fabricación del producto mejorado. Se incluyeron ensayos con torquímetro, que presentaron resultados favorables.

Sep 30, 2019

By Robert Griesbach

One of the important decisions in the development of new mining concentrator projects is the electric power supply for the project. Key decision factors often include the production of power on site versus purchase of power from the grid, ownership of the power supply infrastructure and the choice of generation technology. In this sense, the paper introduce a methodology that will allow the evaluation of the various alternatives to supply electric power to remote mining and mineral processing sites in a consistent and equitable manner taking into account economic and technical considerations and providing the same degree of availability and reliability. The most employed evaluation method consists of carrying out trade-off studies between the various alternatives but care should be exercised so that the alternatives analyzed offer comparable operational results.

Sep 14, 2009

By Pascual Perazzo Vaschetti Gabriella

The increasing emphasis on environmental issues has crucial importance in mining projects, hence in tailings dams. Their water barrier needs a two-fold environmental assessment: the environmental impact caused by construction activities, and the environmental impact over time. Unfortunately, tailings dams’ failures have great and long-lasting environmental consequences, and as mining sites become bigger and tailings dams higher, the risk of failures may increase. Furthermore, since these dams are mostly constructed over many years, design parameters/materials may change, the engineers may change, and since cost is a driving parameter, less attention may be given to quality control and monitoring. Geomembrane water barriers mitigate such impacts.

Sep 30, 2022

By Robert Perlman

The paper point out which area of conflict between international companies y and less developed countries. The lost year the lees developed countries were received invesment very low as to that they can grow and expan. Likewise the foreign investment led easily to its fair share of explicitation and bloodshed. In the same way, the alternative to a particular development being undertaken by foreign capital is either that investment does not take place at all or that capital resources are diverted from somewhere in the domestic economics, in which case some other piece of investment does not take place.

Nov 20, 1969

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 Kenneth C. G. Heath

The paper point out the economics importance of the Torco process as lubricant and fuels of the motor in the mining. It is possible to envisage an arrangement in which TORCO would be used to treat a sulphide ore, the acid used to dissolve the metallic ccoper in the concentrate and the copper produced in cathode form by electrowinning. However, there are studies point out that it would be as profitable as conventional flotation, smelting and refining. To carry out full testing of the TORCO process on anyore would be expensive, involving sending several hundred tons to one of the pilot plants located in Johann esburg or Milan. Such pilot plant testing should & be considered as confirmatory rather than exploratory, and a good economic case for using theTORCO process would have to be made out based of mallet scale testing before in curring the larger expense.

Nov 20, 1969