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By J. Arango Gonzales, J. Vela Portilla

Este estudio se basa en un probable nuevo descubrimiento de un yacimiento de Au, en las rocas del volcánico Llallahui (Grupo Tacaza – Terciario Medio a Superior), que podría estar ligado a la ocurrencia de yacimientos epitermales de Au del sur del Perú. Se trata de un yacimiento epitermal de baja sulfuración, emplazado en autobrechas y tobas donde mediente los análisis químicos de los muestreos realizados se dete rminó valores de leyes en Au 0,10g/TM a 0,81g/TM, estimandose recursos inferidos de 70MT @0,10-0,80 g/t de Au, lo cual convierten en un prospecto de gran potencial.

Sep 1, 2017

By J. Gonzales, C. Chávez

Este estudio se basa en un probable nuevo descubrimiento de un yacimiento de Au, en las rocas del volcánico Llallahui (Grupo Tacaza – Terciario Medio a Superior), que podría estar ligado a la ocurrencia de yacimientos epitermales de Au del sur del Perú. Se trata de un yacimiento epitermal de baja sulfuración, emplazado en autobrechas y tobas donde mediente los análisis químicos de los muestreos realizados se determinó valores de leyes en Au 0,10g/TM a 0,81g/TM, estimandose recursos inferidos de 70MT @0,10-0,80 g/t de Au, lo cual convierten en un prospecto de gran potencial.

May 1, 2008

By Miguel A. Huaman

El presente artículo tiene el objetivo de discutir las consideraciones técnicas para el análisis de rotura de presas de relaves sobre la base de la experiencia en el desarrollo de estas simulaciones en varias presas de relaves en el Perú, las cuales contemplan dos puntos importantes: la generación del hidrograma debido a la liberación del relave, y el tránsito del hidrograma generado a través de un cauce o terreno natural. Para la generación del hidrograma de rotura de la presa se asumen los probables tipos de falla como terremotos, eventos meteorológicos extremos, manejo inapropiado del depósito, vandalismo, entre otros, de acuerdo a las condiciones o características de la zona.

Sep 1, 2017

By Pabel Alvarado

Mineral deposits with large data uses different block dimensions in Long term planning (LTP), short term planning (STP), and ore control (OC). Using applications can Re-block, Krige, Compute variable, Compute Route, etc. necessary block models with multiple dimensions can be created. For instance, disseminated deposits require granular ore control block model because mineralization can be unpredictable. Then different block size must be created for the ore control activity and different block size must be shaped individually in LTP, STP, and OC.

Sep 1, 2017

By Alexander Seyfarth

X-ray systems for elemental and phase determination have become more expensive and easier to use. In this sense, although the new systems offer more functions in the software for matrix correction, preconfigured optimized measurement parameters as well as wizards for method development, they will not perform for the applications if not used with the right sample preparation technique. Experience in this sector is not widely shared since it is a more empirical trial and error approach unique to the sample preparation equipment used. This paper outlined 3 case studies, where the sample preparation was crucial in the adaptation of the X-ray technique and it also illustrated that an analytical solution is not complete without the sample preparation, which ultimately governs the accuracy of reference materials and unknowns used. Comparing the necessary sample for XRF with the one used for ICP analysis clearly shows the time and cost savings.

Jul 31, 2003

By Doris Hiam-Galvez

The latest technologies that improve mining and mineral processing efficiency and significantly reduce the emissions and effluents will be briefly reviewed. In this sense, the paper point out that the water treatment using techniques such as nanofiltration through membranes to achieve purity levels equal to the incoming water supply is now possible and examples of how this is done will be presented. Membrane technology using nanofiltration can be effectively used for recovering valuable products in water from mining operations and also to remove contaminants. The resulting water is of prime quality equalling potable water standards. The technology can be adapted to most mining operations.

Sep 12, 2011

By Mark Ward

The Rincon del Tigre (RdT) complex is one of South America’s largest and best-developed mafic-ultramafic layered intrusions. It is set in the SE Bolivian lowlands, about 50 km from the Brazilian border.The BGS (British Geological Survey) and GEOBOL (Servicio Geologico de Bolivia) carried out an initial investigation of the RdT complex from 1976 to 1986. In this sense, the paper point out the geology background of The Rincon del Tigre, economical potential, typical ore secuence in laterite nickle deposit and pega pega erosional surface (Oligocene).

Apr 24, 2001

By Iván Ibañez

An essential aspect of energy efficiency is determining the opportunities to improve a system or machine's performance from the energetic point of view. For the mining industry, it's a classic problem that mainly all the equipment manufacturers face today to produce the same results with the minimum energy requirements. Existing research focuses on light-duty vehicle energy losses. However, heavy-duty off-road machinery is understudied. This article presents an energy balance assessment of a mining vehicle utilized in an open-pit mine in Colombia.

Sep 29, 2023

By Aigen Zhao

This paper describes the geocomposite manufactured with a special HDPE geonet and heat-laminating a polypropylene geotextile to one or both sides of the geonet. Also the text presents the design and result analyses of large-scale field test pad with the geocomposite overliner system, compared side by side to a control pad with a conventional gravel and pipe drainage system.

Oct 21, 2015

By Greg Corbett

The paper point out the styles of Pacific Rim epithermal gold mineralization. Some characteristics of differing styles of epithermal gold mineralization influence investment decisions (metallurgy, metal ratios, mining style), while others should be taken into account during prospecting (pyrite content and resistivity govern geophysical techniques, vein/breccia styles control drilling, gold distribution influences ore reserve determinations). Two groups of epithermal deposits are distinguished by the fluid style which controls ore and gangue mineralogy. High sulfidation systems develop from the reaction of hot acidic magmatic fluids with host rocks to produce characteristic zoned alteration and later sulfide (dominantly enargite-pyrite) and Au-Ag-Cu deposition. Ore systems display permeably controls governed by lithology, structure and breccias, typically phreatomagmatic breccia pipes, and should be distinguished from a group of generally non-economic acidic alteration including: steam heated alteration, lithocaps or barren shoulders, acid sulfate, and magmatic solfatara alteration.

Apr 24, 2001

By Eric Nelson

The paper point out the structural openings and the localization of ore bodies. Structural openings in rocks constitute the primary permeability network for the formation of most hydrothermal ore deposits. The distribution, geometry, density, and orientation of ore bodies in structural openings are controlled by two primary factors: the far and near field stresses and the mechanical properties of rock. When stress controls the orientation and kinematics of faults and fractures in the absence of pre-existing weaknesses, ore shoot orientation is perpendicular to the fault slip vector and can be predicted by kinematic analysis. However, when structural openings form along pre-existing weaknesses, ore shoot orientation cannot always be predicted by kinematic analysis. Because we can classify ore bodies based on the types of geological structures discussed above and the variations that naturally occur from material property heterogeneity, exploration for hydrothermal ore deposits should include analysis of geologic structure and evolution, rheological variations, pre-existing weakness, and fault kinematics to evaluate structuralcontrols on localization of ore bodies.

Apr 22, 2003

By Jeremy Dowling

Mine dewatering is needed in most large open pits but the current practice of using in-pit vertcal wells is often chellenging to implement with good results. In order to address these challenges, SWS collaborated with FMI and innovated a directionally placed mine dewatering well workflow, based on well placement technologies from the Oil and Gas industry. The main aims of the program are to: Maximize hydraulic contact between the ore deposit and production dewatering wells and attain enhanced well production rates from the most important fracture sets. Move the well-heads to permanent areas outside of mine operating areas, removing or reducing the need for in-pit wells and allowing for sustained, prolonged pumping runs times.

Oct 21, 2015

By Jerry Rowe

There are numerous examples of historic and recent mines that have no closure system or have poorly designed closure systems. These mines may contaminate water resources, land resources and cause significant impacts to human health and the environment. As a result of these problems, many regulatory agencies around the world require that mine closure systems be implemented to manage ARD and protect water resources. In this sense, the paper discusses some of the key elements that need to be evaluated when selecting a mine closure system. These include the specific site climatic, hydrogeologic, hydrologic and geochemical conditions that must be considered for closure design. Two examples of innovative mine closure systems that have been implemented to take advantage of site specific conditions to effectively manage water are provided. The mine closure systems incorporate passive measures to control ARD (acid rock drainage) and protect water resources.

Sep 21, 2013

By James Jones Bozovich

"PUERTO AGUILA is a deep sea port terminal for the receipt, storage and dispatch of container, mineral, and bulk liquid ships in the coastal area of the District of Matarani, province of Islay, Arequipa Region and Department. The concept of the project considered is to meet the unmet demand for new mining, commercial, and industrial international projects in the South of the Peru. Puerto Aguila will create a new community and generate jobs in the Arequipa region of Southern Peru. "

Sep 1, 2017

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 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 Dave Gilbert

The Antamina tailings beach is considered a fundamental design component, as well as a predictive control for phreatic surface control. In this sense, the paper point out the development and purpose of the tailings beach , as well as what future opportunities may exist. These present and future opportunities, include implications of the beach as an evaporative surface control thus reducing pond volume. These desireable outcomes include better control of the phreatic surface in a rockfill dam, and reduction of pond water volume.

Sep 21, 2013

By Xuejing Xie

Exploration geochemistry for many years has been very effective in searching for mineral deposits covered by residual overburden or blind ore bodies hosted in pre-ore rocks. It has not been as effective discovering ore bodies deeply concealed under various kinds of transported overburden or post-ore sedimentary and volcanic rocks. From the 1980s to 1990s, various types of new geochemical techniques with the ability of deep-penetration through exotic covers have been developed. The concepts and methodology of deeppenetrating geochemistry are evolving from partial extraction and gas surveys prevailing from the 1950s up to now, but there are intrinsic differences. Most of the new deep-penetrating methods are used in detailed surveys to delineate deeply concealed ore bodies which could not be ascertained by conventional geological, geophysical and geochemical surveys. In this sense, the sampling and analytical methods of Nameg and Momeo are described briefly. Experiments of such strategic deep-penetrating geochemical surveys have been carried out in desert, alluvium, steppe and laterite covered terrains in China, Australia and Uzbekstan.

Apr 24, 2001

By Peter Megaw

The paper point out that the carbonate Carbonate Replacement Deposits (CRDs) are epigenetic, intrusion-related, high-temperature sulfide-dominant Pb-Zn-Ag-Cu-Au-rich deposits that typically form lenses or elongate to elongate-tabular bodies referred to as mantos or chimneys. Recent studies have shown that CRDs do occur in predictable geologic environments, allowing focusing of regional exploration. In addition, they have mappable alteration patterns that can be used to determine the magnitude of a given system and elemental zoning patterns that greatly enhance the chances of drilling success. Several recent discoveries of “blind” replacement deposits have been made by careful field evaluation of host and capping rocks coupled with geophysics.

Apr 24, 2001

By John Guilbert

"The paper examine the remarkable improvements in our understanding of the linkages among hydrothermal ore deposit types that are developing as we enter the 21st century. Dramatic changes have occurred in ourperceptions of formative processes and genetic models for hydrothermal deposits in the last 30 years that will profoundly change the techniques and methods whereby exploration for those deposits will proceed in the next decades. "

Apr 24, 2001