Passive uranium remediation at Cluff Lake, Saskatchewan

阿海珐资源加拿大公司，总部位于SK萨斯卡通，在加拿大经营了50多年。20多年来，AREVA及其前身公司一直经营着位于萨斯喀彻温省西北部的克拉夫湖铀矿。在2002年关闭该矿后，克拉夫湖的物理退役活动于2004年至2006年完成。大片地区被重新倾斜，而地下矿山和露天矿要么被回填，要么被地下水和地表水淹没。目前，被淹的坑含有高浓度的金属，包括铀(U)、镍（Ni）和砷（As），这些金属来自周围的废石、基岩、地下水和地表径流。本研究的目的是：(1)确定超过省和联邦标准的水中微量金属的来源，重点是U， Ni和As；(2)了解克拉夫湖遗址两个不同年龄被淹矿井的U循环，量化被动修复方案的效益，识别被动修复方案的长期不确定性；(3)收集数据，评估是否可以通过生物刺激等主动干预来加强被动修复方法，以促进矿区所处寒冷气候地区的水相金属固存。

AREVA Resources Canada, headquartered in Saskatoon, SK, has been operating in Canada for over 50 years. For over 20 years AREVA and their predecessor companies operated the Cluff Lake uranium mine, located in northwestern Saskatchewan. Following closure of the mine in 2002, physical decommissioning activities at Cluff Lake were completed between 2004 and 2006. Large areas were re-sloped, while underground mines and the open-pit excavations were either backfilled or allowed to flood with groundwater and surface water. At present, the flooded pits contain elevated levels of metals including uranium (U), nickel (Ni) and arsenic (As),which are sourced from surrounding waste rock, bedrock, groundwater, and surface runoff. The objectives of this study are to: (1) identify the sources of aqueous trace metals which are in excess of provincial and federal guidelines, with a focus on U, Ni and As; (2) understand U cycling in two flooded mine pits of different ages at the Cluff Lake site, and to quantify the benefits of the passive remediation option and identify any long term uncertainties in the passive remediation approach; and (3) gather data to assess if the passive remediation approach could be enhanced through active intervention, such as biostimulation, to facilitate aqueous metalsequestration in the cold climatic region in which the mine site is located.