Search Documents

By Lía Martínez, James J. LoCoco

Borehole geophysical logging has developed and improved many measurements for mining exploration in the past decade. Imaging tools such as the acoustic and optical televiewer are now being used to collect real time, high resolution, oriented fracture and bedding data. Drill holes 100’s of meters deep can be processed very quickly using automated structure picking software and borehole core samples can be digitally logged instead of using paper and pencil.

May 1, 2008

By Patrick P. M. Afenya

"The paper point out the mineralogical aspects about metals processing volcano-related gold, silver and copper ores. The copper group of metals comprises gold, cooper and silver. These metals have been considered together here because of similarities in their chemical properties. Consequently, these metals commonly form minerals with the same elements or group of elements. It is realized that the formation of minerals and final physicaland chemical states of any mineral may depend on many factors such as temperature, pressure, activity of species and pH of the fluid, mode of formation, paragenesis, geological age and post crystallization events. For the purpose of this discussion, attention will be focused on temperature as the principal factor influencing mineral formation."

Jul 31, 2003

By Rob D. Morrison

The paper point out the opportunities for improved performance from Mine to Product using a range of technologies developed at the JKMRC. There are several underlying themes: Readily available computing power makes possible instrument like SPLIT, JKFrothCam and the JK/FEI Mineral Liberation Analyser, a large research project is underway applying acoustic monitoring techniques to large mills with the object being to more accurately monitor total mill load and ball load on-line. Taking advantage of these opportunities will require detailed ore characterization, good models and accurate measurement of mine and plant performance.

Sep 13, 2001

By Józef Hansel

The paper point out that shaft hoists operated in Polish mines represent the average wolrd standard. In this sense, transport of mining personnel and mined material from increased depths causes no major problems, the number of hoists of considerable loading capacity still increases despite the increase in the shaft depth; the output per one mine hoist has grown considerably and high safety standards in personnel transport are provided (in the last 10 years no life was lost during personnel transport).

Sep 13, 2001

By N. Bournas, A. Prikhodko

A new litho-structural map was derived from the airborne geophysical survey and the 3D inversions. The newly identified faulting structures are suggested to have played a key role in the gold mineralization control. Several kimberlite targets, whose magnetic response is similar to known diamantiferous kimberlite pipes occurring within the study area, were identified from the 3D inversion results. Enhanced spectrometric data imaging and their interpretation results helped detect several uranium targets occurring within the Neoproterozoic sediments and the Eburnean pegmatites of the basement rocks.

May 1, 2008

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 Jean Legault

ZTEM is a natural field airborne EM technology that is in its 10TH year of service and is widely used for porphyry copper exploration around the world, yet is still considered a new technology. ZTEM uses EM fields generated by worldwide thunderstorm activity as is primary source field. Its large depth of investigation (>1km), its sensitivity to weak lateral resistivity contrasts and the relative simplicity of its EM fields for computer modelling are among its greatest attributes. ZTEM has helped discover blind porphyry copper deposits and is also widely used in unconformity uranium, epithermal gold and geothermal exploration around the world.

May 1, 2008

By Robert Shaw

"The paper point out the volcanogene and sediment-hosted base metal deposit from the Colombian cordilleras have been considered in the light of tectonogenic models for these deposit types, based upon the recent re-interpretation of the geology and tectonic assembly of the Northern Andean Block by Cediel and Cáceres and Cediel. Numerous distinct propitious metallogenic settings containing important but subexploredbase metal mineralisation are manifest as a result of the tectonic evolution of this northern-most sector of the Andes. Some examples include like a) Central African Cu (U) Belt - type mineralisation within the back-arc region of the early– middle Paleozoic Cordillerantype Quetame Orogeny, b) numerous SEDEX and Sediment-Hosted Zn (Pb-Ag) and Cu (Ag) styles of mineralisation associated with various phases of continental and continental margin rifting during the late Paleozoic to Mesozoic Bolívar Aulacogen, and c) various Cu-Zn-Pb (Au, Ag) Volcanogene Massive Sulphide manifestations associated with intra-oceanic magmatic arc development and accretionary tectonics during the Meso-Cenozoic Northern Andean Orogeny. "

Apr 22, 2003

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 Patrick High Smith

The paper summarizes the results from geochemical orientation and project surveys in North and South America. The orientation surveys were designed to characterize the soil gas response over buried mineralization and compare soil gas geochemistry with other geochemical exploration techniques for overburden. In addition to successful tests in orientation surveys, soil gas geochemistry has been applied in large-scale exploration programs for gold, copper, and zinc. The studies includes results from several of these surveys, including the Crandon Zn-Cu massive sulfide deposit in Wisconsin, USA, and the Ruby Star skarn Cu deposit in Arizona, USA.

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 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 Dan W. Bench

PCBs are hazardous not only to human health and the environment but also to the mining industry because of potential worker exposure and improper disposal liabilities. In this sense, the paper point out the identification, management, and proper disposal of pcb-containing electrical equipment used in mines. Also it point out alternatives to PCB dielectrics, storage, and disposal. The use of PCBs in mines has been documented during U.S. Environmental Protection Agency Region 8 mine inspections and it used as dielectrics in transformers, capacitors, and fluorescent light ballasts are common throughout industry worldwide.

Sep 14, 2009

By George Shou

"The paper point out about economics of thickened tailings transportation. In this sense, the optimal concentration is determined based on the balance between the incremental costs of thickening and transportation and theincremental environmental benefits. A detailed feasibility study is essential for financial success of a tailings project. Hydraulics modeling is the key to estimate the transportation cost curve. "

Jul 31, 2003

By Roger Henning

Although flotation is widely used throughout the minerals industry, it is a relatively inefficient process. The economic benefits of improved operation are considerable. A multivariable level stabilising system has been developed to reduce the amount of fluctuation in flotation levels. It has been shown on several plants that the better level control leads to improved metallurgical performance. A level measurement based on conductivity is also described. The device provides some insight into the behaviour of the froth.

May 25, 1998

By Yvan Guzmán, Víctor Ascuña, Federico Calisaya, Giraldo Carpio

El presente trabajo tiene como objetivo presentar el diseño de un concentrador centrífugo gravimétrico usando aire como fluido, que será usado en la recuperación del oro fino presente en los minerales auríferos. Se utiliza el modelamiento matemático fenomenológico como herramienta para el diseño del concentrador.

Sep 1, 2017

By Marc Leduc

Since co-disposal technology promises to replace conventional tailings disposal methods at sites with high strip ratios or plentiful old dumps. While the mine waste needs to be relatively strong and low in fine material, and chemical compatibility must be assured, when these parameters are satisfied there are no other significant hurdles to its implementation. In this sense, the paper describe the resulting benefits range from substantial reduction in capital and operating costs to reduction or essential elimination of the short- and long-term liabilities associated with tailings dams are impoundments.Since tailings dam failures are arguably the greatest environmental liability and public relations problem in the industry, reducing the quantity of tailings managed behind dams is a worthy goal.

Jul 31, 2003

By Edmundo Alfaro

"The paper point out about on the use of ion exchange resins for adsorption of gold from ammoniacal thiosulfate solutions. In this sense, the gold can be recovered from ammonium thiosulfate solutions with strong base resins. The amount of gold loaded onto the resin in a batch process is a function of gold concentration in solution, amount of resin, volume of solution, copper and competing ions concentration in solution. Thiosulfate concentration in leaching solution has influence on gold loadings onto resins; in contrast, ammonia concentration in solutions has no influence on gold loadings. Gold seems to be loaded onto the resin preferentially over copper - thiosulfatecomplexes and also over thiosulfate ions. Polythionate ions strongly compete with gold and copper thiosulfate complexes for resin sites. This causes reduction on gold and copper recoveries from the leaching solutions. Even more, polythionates are produced in leaching solutions when thiosulfate is oxidized by the action of both copper and oxygen. "

Jul 31, 2003

By Marcelo Rocco Salinas

La presencia de arsénico en aguas de mina (efluentes mineros) es una preocupación constante en el Perú, debido a que los receptores superficiales de estos efluentes son utilizados para bebida de animales, o riego de plantas. Las razones de la presencia de este metaloide están asociadas a la mineralogía propia del país. En este manuscrito se presentan los resultados de pruebas a escala industrial realizados en una compañía minera ubicada en el distrito de Canarias, provincia de Víctor Fajardo, departamento de Ayacucho.

Sep 1, 2017

By J. B. Greenwood

The paper point out some reasons why contract mining should not achieve the same success in Latin America as it has in Australia. In this sense, any reasons are: the size of operation, mining industry employees bonus scheme, the privatization of nationalized mining assets, general sales tax and the mining unions. Therefore, great deal depends on the attitude or "mindset" of a company's employees. lt is strongly my view that the attitude with which a contractor approaches a job will give rise to a superior mindset amongst its employees when comparad to those from most mining companies. The value of this cultural difference is significant and should never be underestimated. lmportantly, it doesnot only manifest itself in a more productive workplace: it is invariably the case in Australia that the safety achievements of contract miners are superior to those generally expected from the mining industry at large.

Oct 6, 1999