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By Gawen Jenkin

The extraction of metals from ores is often an energy-intensive process, requiring either smelting or leaching at high temperature, or the use of large quantities of strong acids or bases that require energy to produce. These processes often produce wastes, in gaseous, liquid or solid form, which require treatment before they can be safely disposed, and this waste treatment requires further energy. Thus there is a need to develop more energy-efficient and environmentally-compatible methods. In this sense, the paper point out that ionic liquids are one such method, and that they can be used to selectively dissolve and recover native gold and tellurium, sulphides and tellurides.

Oct 21, 2015

By Emilio Navarro

XML technology can be used as a standard to transfer information from a relational database to any system that relies on such information. There have been many proprietary methods to perform this information transfer, However, none of them was either able to talk to each other or exchange information in a transparent way. This paper describes a system that will allow for a transparent exchange of information not only between a Web browser and a Web Server but also a stand-alone application and the same Web Server. First, the autor summarize the Internet technologies that support the possibilities. Then the autor outline the tasks needed in order to take advantage of these technologies. Finally, it is suggest a few applications that could take advantage of this system.

Aug 25, 2002

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 Joseph W. Ruetz

The paper describes the San Nicolas deposit, México. San Nicolás deposit is the most important VMS deposit discovered in Mexico to date, and a major deposit on a global scale. The discovery of San Nicolas resulted from the early recognition of VMS mineralization in a region not known for this style of mineralization, and the flexible use of appropriate exploration technology.

Apr 24, 2001

By Murray Hitzman

Central and southern South America contain a variety of sediment-hosted base metal deposits including shale-hosted Zn-Pb-Ag, Irish-type Zn-Pb-Ag, BrokenHill-type Pb-Zn-Ag, Mississippi Valley-type Zn-Pb, and sediment-hosted stratiform Cu deposits. In this sense, the paper point out Potential for sediment-hosted base metal deposits in Central and Southern South America.

Apr 24, 2001

By R. W. Lawrence

This paper provides a brief overview of biogenic sulphide reagent production from elemental sulphur, discusses the main advantages of recovering metals and treating heavy metal pollution using biogenic sulphide, and presents operating results from commercial plants.

Sep 12, 2005

By Mustafa Onder

The paper point out that there are two méthods in the design of the long auxiliary ventilation systems. These methods can be summarized as constant fan spacing and constant fan size. If the fans are placed at the end of the duct, leakage will increase due to the high combined pressure.Also The program called SERIP can be used to examine the effects of positioning the fans at varying distances along the duct and determine the appropriate locations.

Jul 17, 2000

By Dario Bernabe

This paper evaluates four open pit mine scheduling programs recently developed and compares them in order to determine if significant differences exist among them. The same input data, which consist of a 3-D block model, an economic set of parameters, and the initial surface topography for a operating copper mine in Southern Peru, was used to test each technique.

Aug 25, 2002

By Reinhold A. Errath

"The paper describes the problem related with contradiction to the development of sag mills, which one are becoming bigger in size almost every year. In this sense, the concentrator plants are being built more and more in remote areas where the power supply and network conditions are not necessarily covering the needs for the operation of such plants. It also illustrates the permissible tolerances in terms of commutation of the powerelectronics, based on already realized installations. Finally the paper gave an overview about the technical impact of a strong versus weak networks."

Jul 31, 2003

By Tomás Chaparro

El presente texto señala la metodología para evaluar al Supervisor de Seguridad no solo desde el punto de vista técnico, sino también desde las habilidades interpersonales. Por ello, se revisa el perfil de dicho supervisor donde se aplica la metodología de E=QxAxP ( eficiencia del supervisor de seguridad, conocimiento, aceptación, pasion), donde el último factor, es el que prevalece como parte de la calidad del supervisor y su relación con la enseñanza.

Sep 21, 2013

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 Edmundo Alfaro

The paper describes the thiosulfate process for gold leaching like the best non-polluting alternative to cyanide. Thiosulfate is a non-toxic lixiviant and has the ability to complex gold and silver. Copper bearing ores are not harmful for the process and does not suffer the preg-robbing phenomenon like in the case of cyanide. Nevertheless, the process is not fully developed, basically because of the poor understanding of the solution chemistry. Upon thermodynamic considerations and experimental evaluations it was found that the system is unstable; thiosulfate oxidation is unavoidable and ammonia is lost by evaporation. Measures to reduce thiosulfate oxidation include the adequate balance of ammonia and thiosulfate concentrations, adequate pH, additions of sulfite and additions of complexing agents like glycine.

Sep 12, 2005

By H. E. Wyslouzil

Column flotation technology was introduced to the market place about thirty ago years as a device capable of producing concentrates that were lower in impurities than those produced by other types of flotation machines. The ability to operate columns with significantly deeper froth beds and the provision of a froth washing system were the main reasons cited for the improved metallurgical performance. Column cells are now well accepted by the industry for cleaning applications, but there continues to be considerable skepticism about their use as roughers. There have been several documented cases of rougher installations which fell well short of predicted metallurgical performance. The reasons for the shortcomings vary from case to case, however they can be generally attributed to incorrect sizing, inappropriate application and or a lack of understanding of how column cells must be integrated into an existing plant or new project. Columns may not be the best choice for every application. In this sense, this paper discusses some of the important considerations that designers must take into account when contemplating the use of columns as roughers.

Sep 12, 2005

By Kevin Gunesch

In the current difficult financial markets, only the best projects will advance to the next phases of development due to limited funding. Projects are consistently being evaluated by their initial Capital Expenditure (CapEx), Net Present Value (NPV), and Internal Rate of Return (IRR). Optimizing these parameters is the best way to gain market interest. Global Resource Engineering LTD (GRE) completed an optimization study for a silver-lead-zinc project in Peru. In this sense, the objective of the study was to minimize the project initial Capital Expenditure while maximizing the Net Present Value and Internal Rate of Return. GRE accomplished this goal by completing a series of tradeoff studies for the project and combining them through the use of a multi-scenario deterministic model to find the most economic scenario.

Oct 21, 2015

By Pierre Shields, Luiggi Sassarini, Richard Zandstra, Thomas Li

The intent of this paper is to demystify the mythology which often confront mine owners and engineers faced with this dubious question “Is it better to develop or continue a ramp or make a vertical shaft to access the new ore body of interest?” trough out measuring risk and return using probabilistic analysis and unhidden cost the affect long term decision such ventilation.

Sep 1, 2017

By B. Whistler

The Alpala porphyry copper-gold deposit is a recent discovery located in the Imbabura Province of northwestern Ecuador. The drilling of seventeen diamond core holes over a 900 m by 400 m area has defined a northwesterly-trending, steeply northeast-dipping dike-stock complex of diorite to quartz diorite that exceeds 1300 m in height. This intrusive complex is hosted by a sequence of andesitic volcaniclastic rocks and lavas. The host-rocks are interpreted to be part of the Paleocene to Late Eocene Macuchi Formation (BGS-CODIGEM, 1997; Cruz, 2007). The best drill intercept to date is 1312 m at 0.67 % Cu and 0.63 g/t Au from 128 m depth in CSD-15-012, which includes 576 m at 1.03 % Cu and 1.19 g/t Au.

May 1, 2008