نتایج جستجو برای: mine exploitations
تعداد نتایج: 24223 فیلتر نتایج به سال:
A new type of cosmic-ray experiment is under construction in the Pyhäsalmi mine in the underground laboratory of the University of Oulu, Finland. It aims to study the composition of cosmic rays at and above the knee region. The experiment, called EMMA, will cover approximately 150 m of detector area. The array is capable of measuring the multiplicity and the lateral distribution of underground ...
Compte tenu de l’importance socioéconomique et alimentaire du riz, les producteurs utilisent plusieurs systèmes production pour mieux assurer la compétitivité leurs exploitations. La présente étude vise à analyser l’efficacité économique des riz en bas-fonds. Un échantillon 283 a été constitué façon aléatoire. L’approche stochastique frontières coût permis d’une part d’estimer décomposer ces de...
rehabilitation ofabandoned open excavation forbeneficial use of the pit lake at nyala magnesite mine
abandoned surface mine excavations can be a major environmental, social and/or human healthproblem for the mining industry as well as for the community living nearby. this problem is exacerbated by therapidly growing population encroaching on areas of historic mined lands. the aim of this studywas to assess thesafety status of the historic nyala mine excavation with the purpose of coming up wit...
The activities of mining exploitation in Campo de Jales were performed in an uncontrolled way and gave rise to serious environmental contamination: rubbish depositories have been accumulated with no treatment or maintenance. An investigation developed around Jales Mine showed the existence of some chemical impact originated from the waste produced during mining activities. Some "black spots" fo...
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