نتایج جستجو برای: sub level caving
تعداد نتایج: 1264833 فیلتر نتایج به سال:
China recently implemented a “Green Mine” policy focused on promoting the filling method, aiming to mitigate environmental impacts of underground mining; nevertheless, quantitative inventories have rarely been provided support or negate such promotion, especially from life-cycle perspective. Accordingly, this paper proposes bottom-up model for estimating greenhouse gas (GHG) emissions metal min...
BACKGROUND To eliminate blinding trachoma, the World Health Organization emphasizes implementing the SAFE strategy, which includes annual mass drug administration (MDA) with azithromycin to the whole population of endemic districts. Prevalence surveys to assess impact at the district level are recommended after at least 3 years of intervention. The decision to stop MDA is based on a prevalence ...
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