Impacts of gold mine waste disposal on deepwater fish in a pristine tropical marine system

Little is known about the impacts of mine waste disposal, including deep-sea tailings, on tropical marine environments and this study presents the first account of this impact on deepwater fish communities. The Lihir gold mine in Papua New Guinea has deposited both excavated overburden and processed tailings slurry into the coastal environment since 1997. The abundances of fish species and trace metal concentrations in their tissues were compared between sites adjacent to and away from the mine. In this study (1999-2002), 975 fish of 98 species were caught. Significantly fewer fish were caught close to the mine than in neighbouring regions; the highest numbers were in regions distant from the mine. The catch rates of nine of the 17 most abundant species were lowest, and in three species were highest, close to the mine. There appears to be limited contamination in fish tissues caused by trace metals disposed as mine waste. Although arsenic (several species) and mercury (one species) were found in concentrations above Australian food standards. However, as in the baseline (pre-mine) sampling, it appears they are accumulating these metals mostly from naturally-occurring sources rather than the mine waste.     

铀尾矿库退役后的污染源项调查方法

从源项调查的目的、意义、基本内容和主要方法等方面进行了研究,分析了国内该方面研究工作的主要动态,指出了目前源项调查工作存在的主要问题,并对退役治理工作提出了合理的建议。     

人工矿床定量评价研究——以云锡公司古山采选厂葫芦塘尾矿库为例

对人矿床进行地质－工艺评价，开发利用这一巨大的潜在资源，是现阶段矿业生产发展的一项迫切的新任务。以葫芦塘尾矿库为例，通过三维模拟技术对尾矿库型人工矿床的形态、产状、储量、品位及其变化进行了定量模拟和评价；同时开展了人工矿床的技术评价和经济评价。通过对尾矿开发成本构成以及精锡成本影响因素的定量分析，得出了提高经济效益的最佳对策。     

Arsenic fixation on iron-hydroxide-rich and plant litter-containing sediments in natural environments

Iron-hydroxide-rich and plant litter-containing sediments from natural sites contaminated with uranium mine tailing leachates were examined for their ability to adsorb arsenic. The samples with high contents of iron hydroxides (Fe_total concentration, >300 g kg⁻¹) exhibited remarkable fixation of arsenic (up to 40 g As kg⁻¹). This value corresponded approximately to the supersaturation point for natural iron hydroxides under the present conditions, and it was significantly lower than the value found for synthetic iron hydroxides. There was a strong correlation (R=0.8999) between the concentration of iron and that of arsenic at low arsenic contents, indicating adsorption on strong binding sites. Although all the samples had noticeable contents of organic carbon (plant litter), calcium, and manganese, no obvious effect of these elements on arsenic fixation could be detected. The amount of iron hydroxides was found the only fixation-controlling parameter immediately below a leaching water source.     

找矿哲学在紫金矿业中的应用

随着地表找矿难度的日益加大,目前的找矿目标应从以地表找矿为主转到地下找矿为主,这就需要有更高层次的找矿哲学作指导来提高找矿的成功率。紫金矿业合理利用废弃的毛石充分体现了找矿哲学思想,这样做提高了企业效益,再通过联合经营使资源枯竭型矿山企业走上可持续发展之路。     

铀水冶尾矿库地下水流特征与模拟分析：以某矿为例

铀水冶尾矿库中地下水流动特征控制了核素向周围环境扩散与迁移。本文以某矿山谷型尾矿库为例,运用二维有限元模拟了库内地下水分布及流动,结合水文地质条件进行了分析与讨论。     

四川若尔盖巴西金矿堆浸尾矿提金工艺研究

四川若尔盖巴西金矿堆浸属矿金平均品位 2 .5 5× 10 -6,为了进一步回收尾矿中的金 ,用氰化法、硫脲法、溴法、硫代硫酸盐法、石硫合剂法 5种方法进行了提金试验和制粒氰化法提金试验 ,在此基础上提出了回收该尾矿中金的最佳方案     

Diatomeenstratigraphische Untersuchungen zur Trophieänderung und Industrieschlammakkumulation im Traunsee/Österreich

Three cores from Traunsee were investigated and compared with respect to diatom stratigraphy concerning dating of incursions into and rate of accumulation of industrial tailings in the profundal zone.

     

尾矿中绢云母回收试验研究

经对尾矿中绢云母试验研究，确定尾矿中回收绢云母的工艺采用先粗选后浮选的方法，同时加入捕收剂BK，抑制剂B—1和B—2，使绢云母的纯度达到98％，尾矿中绢云母产出率为6％。     

Uranium pollution of South African streams – An overview of the situation in gold mining areas of the Witwatersrand

During more than a century of gold mining in South Africa large amounts of tailings were produced, which now cover vast areas in densely populated regions. These dumps contain elevated levels of uranium and other toxic heavy metals associated with gold in the mined ore. Large-scale extraction of uranium from auriferous ore only took place during the cold war, leaving tailings with high uranium concentrations that were deposited before and after this period. Recent studies found elevated levels of the radioactive heavy metal in groundwater and streams, mainly attributed to the discharge of contaminated water from mines. In this paper the contribution of seepage from slimes dams to the uranium pollution of adjacent streams is analysed. Based on geochemical analyses of samples, field observations and long-term in situ measurements of hydraulic and hydrochemical parameters at selected mining sites across the Witwatersrand goldfields, the extent, mechanisms and dynamics of diffuse stream contamination by tailings seepage is characterised. Temporal and spatial variations of the process and the associated hazard potential are discussed. This revised version was published online in July 2006 with corrections to the Cover Date.