Surface water and groundwater interactions in an extensively mined watershed,upper Schuylkill River,Pennsylvania, USA

Streams crossing underground coal mines may lose flow, whereas abandoned mine drainage (AMD) restores flow downstream. During 2005–2012, discharge from the Pine Knot Mine Tunnel, the largest AMD source in the upper Schuylkill River Basin, had near‐neutral pH and elevated concentrations of iron, manganese and sulphate. Discharge from the tunnel responded rapidly to recharge but exhibited a prolonged recession compared with nearby streams, consistent with rapid infiltration of surface water and slow release of groundwater from the mine complex. Dissolved iron was attenuated downstream by oxidation and precipitation, whereas dissolved CO₂ degassed and pH increased. During high flow conditions, the AMD and downstream waters exhibited decreased pH, iron and sulphate with increased acidity that were modelled by mixing net‐alkaline AMD with recharge or run‐off having low ionic strength and low pH. Attenuation of dissolved iron within the river was least effective during high flow conditions because of decreased transport time coupled with inhibitory effects of low pH on oxidation kinetics. A numerical model of groundwater flow was calibrated by using groundwater levels in the Pine Knot Mine and discharge data for the Pine Knot Mine Tunnel and West Branch Schuylkill River during a snowmelt event in January 2012. Although the calibrated model indicated substantial recharge to the mine complex took place away from streams, simulation of rapid changes in mine pool level and tunnel discharge during a high flow event in May 2012 required a source of direct recharge to the Pine Knot Mine. Such recharge produced small changes in mine pool level and rapid changes in tunnel flow rate because of extensive unsaturated storage capacity and high transmissivity within the mine complex. Thus, elimination of stream leakage could have a small effect on the annual discharge from the tunnel, but a large effect on peak discharge and associated water quality downstream. Published 2013. This article is a U.S. Government work and is in the public domain in the USA.     

从铜山铜矿深部找矿的经验谈老矿山深部找矿的成功要素

铜山铜矿是一个开发历史超过50年的中型铜矿山,在近年开展的危机矿山接替资源勘查过程中,在深部找到了铜金属储量超过了22万吨的矿体。本文在全面总结铜山铜矿深部找矿经验和成果的基础上探讨了制约深部找矿成功的因素。创立具有预测能力的成矿理论是预测深部矿体的最有力的保证,但对深部矿体的可靠的预测需要有勘探工程决策和投资决策的支持才能转化成具经济价值的矿产储量,不能别面强调物探技术在深部找矿中的作用,更不能轻视地质专家和钻探技术在深部找矿中的作用。     

瞬变电磁法在红旗岭铜镍矿3号岩体勘查中的应用与研究

作为一个拥有五十余年历史的老矿山,红旗岭铜镍矿,保持矿产资源开采的持续性可谓当务之急。瞬变电磁法(TEM)因其探测深度大、对低阻体敏感等特点在红旗岭矿区的危机矿山接替资源找矿续作项目中发挥了重要的作用。     

兖济滕矿区矿井水资源化利用评价

兖济滕矿区年矿井涌水量近6000万m3,矿井水资源可利用潜力巨大。该文以矿井水资源化综合利用为目的,依据相关标准,采用单因子指数法对矿井水质量进行了评价,并提出了矿井水资源化利用途径。     

平邑县矿山地质环境保护与治理机制探索

平邑县高度重视日益突出的矿山地质环境问题,不断加强矿山地质环境保护与治理工作力度,通过推进矿山公园建设、严格采矿权审批程序及开展矿山地质环境治理总体规划等,对保护矿业遗迹、保护矿山地质环境等工作起到积极作用,并取得了较好的社会效益、经济效益和环境效益.     

营口—宽甸地区重力场特征及地质解释

营口—宽甸地区重力场自北而南有逐渐增高的总趋势。中部区重力低与重力高呈带状相间出现。结合该区已知的地质构造特征综合分析,重力负值带是早元古宙拗拉槽边界深断裂和构造—岩浆岩带的反映。隐伏、半隐伏花岗岩体的解释和推断,为逃一步寻找金、硼、铅锌等矿产提供了信息。     

Baseline heavy metals and metalloid values in blood of loggerhead turtles (Caretta caretta) from Baja California Sur, Mexico

Environmental pollution due to heavy metals is having an increased impact on marine wildlife accentuated by anthropogenic changes in the planet including overfishing, agricultural runoff and marine emerging infectious diseases. Sea turtles are considered sentinels of ecological health in marine ecosystems. The objective of this study was to determine baseline concentrations of zinc, cadmium, copper, nickel, selenium, manganese, mercury and lead in blood of 22 clinically healthy, loggerhead turtles (Caretta caretta), captured for several reasons in Puerto López Mateos, Baja California Sur, Mexico. Zinc was the most prevalent metal in blood (41.89 μg g⁻¹), followed by Selenium (10.92 μg g⁻¹). The mean concentration of toxic metal Cadmium was 6.12 μg g⁻¹ and 1.01 μg g⁻¹ respectively. Mean concentrations of metals followed this pattern: Zn > Se > Ni > Cu > Mn > Cd > Pb and Hg. We can conclude that blood is an excellent tissue to measure in relatively non-invasive way baseline values of heavy metals in Caretta caretta.     

山东省沂水县夏蔚铅及多金属矿地质特征及成因探讨

沂水县夏蔚位于沂沭断裂带西侧,区内铅及多金属矿化特征明显,围岩主要为古生代寒武纪张夏组,基性岩浆含矿热液沿区域性断裂侵入于寒武纪张夏组受上部页岩屏蔽成矿,系碳酸盐型中低温热液充填—交代矿床。     

矿山地质环境质量评价体系构建研究——以胶东莱州—莱西一带矿产集中区为例

基于莱州—莱西一带矿山的自然地理、基础地质、矿山开采、采矿对周边环境的影响等实际因素,运用层次分析法构建矿山地质环境评估要素层与指标层,确定要素层权值和指标层中各评估指数的权重,并通过MapGIS利用网格法对研究区内开展矿山地质环境综合评价,将研究区内地质环境分为无影响区、影响轻微区、影响较严重区、影响严重区,完成环境质量评价体系的构建。     

兖济滕矿区矿井水资源化利用评价

兖济滕矿区年矿井涌水量近6 000万m3,矿井水资源可利用潜力巨大。该文以矿井水资源化综合利用为目的,依据相关标准,采用单因子指数法对矿井水质量进行了评价,并提出了矿井水资源化利用途径。