نتایج جستجو برای: acid rock drainage
تعداد نتایج: 822838 فیلتر نتایج به سال:
Recognition that channel form reflects a river's ability to erode rock has spawned stream-power models that estimate patterns of incision by approximating energy dissipation within a channel. Most commonly, these models assume channel width exponentially scales with drainage area, in part, because drainage area is easily extracted from digital elevation models (DEMs). However, this assumption i...
knowledge of the probable origin and behaviour of arsenic certainly gives valuable insights into the potential for transfer in the environment and of the risks involved in mining sites. sequential extraction analyses are common experiments often used to study the origin and behaviour of potentially toxic elements. the method, however, presents some deficiencies, including labor-intensive proced...
In this study the mixture of limes was used to treat acid mine drainage (AMD) or rock (ARD). The results showed that AMD can be treated by a (CHL). CHL carbide and hydrated limes. Arsenic (As) decreased after reaction with CHL. 0.5 g an interval time 20 mins chosen as best parameter for treating AMD. pH value increased from 3.29 6.69 concentration 3.273 mg/L 0.002 mg/L. Both obtained complied S...
An ideal engineered soil cover can mitigate acid rock drainage (ARD) by limiting water and gaseous O2 ingress into an underlying waste rock pile. However, the barrier layer in the soil cover almost invariably tends to develop cracks or fractures after placement. These cracks may change water flow and O2 transport in the soil cover and decrease performance in the long run. The present study empl...
Stream water quality in areas of the western United States continues to be degraded by acid mine drainage (AMD), a legacy of hard-rock mining. The Rico-Argentine Mine in southwestern Colorado consists of complex multiple-level mine workings connected to a drainage tunnel discharging AMD to passive treatment ponds that discharge to the Dolores River. The mine workings are excavated into the hill...
the investigated area is located 30 km south of sabzevar in halakabad village. geological phenomenons in area follow a trend of nw-se. mineralization consists of metallic and non-metallic (kaolin) mineralization. disseminated and veinlet mineralization is generally associated with argillic alteration type. pyrite is the most widespread type of sulfide mineralization in halakabad occurrences. it...
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