نتایج جستجو برای: mine extraction

تعداد نتایج: 188267  

Journal: :journal of mining and environment 0
hesam dehghani department of mining engineering, hamedan university of technology, hamedan, iran ashkan siami department of mining engineering, hamedan university of technology, hamedan, iran peyman haghi department of mining engineering, hamedan university of technology, hamedan, iran

one of the most important steps involved in mining operations is to select an appropriate extraction method for mine resources. after choosing the extraction method, it is usually impossible to replace it with another one because it may be so expensive that implementation of the entire project could be economically impossible. choosing a mining method depends on the geological and geometrical c...

Journal: :environmental resources research 0
y barkouch laboratoire de toxicologie et d’hygiène industrielle, 1 rue gaston veil, 44035, nantes cedex, france , laboratoire régional du diagnostic épidémiologique et d’hygiène du milieu –marrakech – maroc. a pineau laboratoire régional du diagnostic épidémiologique et d’hygiène du milieu –marrakech maroc

the present study represents a first insight into the draa lasfar min (marrakech - morocco) to assess the degree of polymetallic pollution caused by anthropogenic activities (like mine extraction) and consequently the possible diffusion of heavy metals and to predict the risk of their mobility in the surroundings of the mine area. the edaphologic parameters ph and electrical conductivity (ec) w...

2013
Daniel Espinoza Adolfo Ibañez

In order to carry out an open pit mining operation, planners must periodically prepare what is known as strategic mine plan. This is a tentative production schedule for the remaining life of the mine that defines which area of a mining reserve will be extracted, in what years this extraction will take place, which resources will be used for the extraction, and how the extracted material will be...

2016
Michael Alonzo Jamon Van Den Hoek Nabil Ahmed

The socio-ecological impacts of large scale resource extraction are frequently underreported in underdeveloped regions. The open-pit Grasberg mine in Papua, Indonesia, is one of the world's largest copper and gold extraction operations. Grasberg mine tailings are discharged into the lowland Ajkwa River deposition area (ADA) leading to forest inundation and degradation of water bodies critical t...

One of the most important steps involved in mining operations is to select an appropriate extraction method for mine resources. After choosing the extraction method, it is usually impossible to replace it with another one because it may be so expensive that implementation of the entire project could be economically impossible. Choosing a mining method depends on the geological and geometrical c...

2009
Mihee Lim Gi-Chun Han Ji-Whan Ahn Kwang-Suk You Hyung-Seok Kim

Mine tailings from an abandoned metal mine in Korea contained high concentrations of arsenic (As) and heavy metals [e.g., As: 67,336, Fe: 137,180, Cu: 764, Pb: 3,572, and Zn: 12,420 (mg/kg)]. US EPA method 6010 was an effective method for analyzing total arsenic and heavy metals concentrations. Arsenic in the mine tailings showed a high residual fraction of 89% by a sequential extraction. In To...

Journal: :Interfaces 2014
Donal O'Sullivan Alexandra Newman

We use mathematical optimization to determine a production schedule (i.e., a schedule of extraction and subsequent filling of the voids) for a complex underground mine in Ireland. The goal of the mining operation is to maximize metal production over the life of the mine, subject to constraints on maximum monthly extraction and backfilling quantities, maximum and minimum monthly metal production...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2011
mahmoud abdollahy sayed abbas shojaosadati hasan zare tavakoli ali valivand

this study deals with bioleaching of the low grade uranium ore of saghand mine in iran using a mixed culture of mesophilic bacteria (acidithiobacillus ferrooxidans, acidithiobacillus thiooxidans and leptospirillum ferrooxidans). experiments were carried out in shaking flask examining the effect of temperature, initial ferrous ion concentration, pulp density and particle size. variations of ph, ...

2014
John R. Bargar Peter S. Nico Amitava Roy

Alphabetical by first author Investigating changes in arsenic speciation through the combination of in vitro simulated gastric fluid extractions and EXAFS spectroscopy Mining conducted throughout the state of California has left an environmental legacy of exposed mine wastes containing elevated levels of toxic metal(loid)s including arsenic (As), a known carcinogen. The relationships between sp...

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