Applying Practical Hydrogeology to Tailings Storage Facility Design and Management

Mine Water and the Environment - Hydrogeology plays an important role in tailings storage facility (TSF) design. In this paper, we present hydrogeologic considerations for TSF design and operations...     

Correction to: Design and Construction of a Tailings Dam over an Ancient Tailings Facility at La Parrilla Mine

Mine Water and the Environment - A correction to this paper has been published: https://doi.org/10.1007/s10230-021-00776-0     

Design and Construction of a Tailings Dam over an Ancient Tailings Facility at La Parrilla Mine

La Parrilla is a tungsten and tin mine located in western Spain. The tailings facility has a total capacity for 3 Mm³ and will be executed in four different phases. The main constraint for the design and construction of the tailings dam is that it has been constructed over an existing one from the 1980s. The construction activities involved removal and substitution of the old tailings from the southern portion of the facility, ground improvement with gravel columns over an area of about 10,000 m², and construction of the dyke’s dam. This article describes the main design and construction aspects, including monitoring, until the dam’s completion in June 2019.

     

Determination of Evaporation from a Tailings Storage Facility Using Field Measurements and Satellite Observations

Most mining operations produce waste material, or tailings, which is commonly stored within impoundments known as tailings storage facilities (TSFs). A common TSF design involves depositing slurry on tailings ‘beaches’ which are sloped towards a containing wall or central pond which collects excess water. A crucial aspect of safely operating TSFs is managing the residual moisture content of the deposited tailings, which requires an accurate understanding of the water balance of the TSF. However, evaporation from a TSF is particularly hard to quantify as the degree of surface wetness varies spatially and temporally, and moisture content depends on the time since tailings deposition and the prevailing climate. This study addresses these issues at an active TSF by combining field measurements, models, and satellite observations. Evaporation from open water was measured using a floating evaporation pan and evaporation from the tailings beaches was investigated using micro-lysimeter measurements. Evaporation rates for different moisture contents were expressed as a fraction of open water evaporation and a strong relationship was developed for use in satellite analysis. Spatial and temporal patterns of open water and moisture content were determined at 20 m resolution using moisture indices applied to Sentinel-2 satellite scenes. Continuous open water evaporation rates and spatial moisture content information were combined to estimate total TSF evaporation. Comparison of TSF evaporation rates to those derived using an existing site water balance model showed very good agreement. The methodology developed could be applied at other locations around the world.

     

Development of an Environmental Impact and Mitigation Assessment Program for a Tailings Storage Facility Stability Upgrade

This paper summarizes an environmental impact and mitigation assessment plan developed for a tailings storage facility stability upgrade project at a Canadian base-metal mine. The plan details environmental aspects relevant for channel modification involving the narrowing of a creek channel width. Planning for a tailings storage facility stability upgrade is site-specific, however, this paper details a number of aspects that may be taken into consideration when planning for a project of a similar nature. These aspects include: evaluation of environmental effects and their significance, analyses of cumulative effects, in-situ fish habitat characterization and enhancement program, regulatory requirements, provisions for accidents and malfunctions and fisheries compensation requirements. These considerations together with the proposed monitoring activities for the on-going construction activities are reviewed and discussed in this paper. These aspects can be applied to similar situations when considering factors such as topography, geology, climate, biophysical setting, availability of construction materials, mode of construction, reclamation options and applicable laws.     

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Introduction to this Special Issue on Tailings Storage: Challenges and Technologies

Mine Water and the Environment -     

防水闸门硐室的设计与施工

通过对防水闸门硐室在设计和施工中有关问题的研究和探讨,从理论与实践方面对防水闸门硐室设计与施工进行总结,提出设计和施工的一般原则和方法。     

降水、护坡、隔水幕组合体系的设计与施工

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十三陵抽水蓄能电站压力管道冒顶事故的治理

北京十三陵抽水蓄能电站是解决北京市限电和提高用电质量的重点工程。电站２ 号上斜导井在施工过程中， 遇到张性断层破碎带， 发生冒顶事故， 累计冒落矸石４ ０００ ｍ ３ 。本文介绍了煤炭科学研究总院北京建井研究所承接该项工程后， 制定的“下堵上灌、加压注浆”治理方案、施工工艺及治理冒顶事故的成功经验。     

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某高层建筑基坑紧邻原有建筑地基,施工场地狭窄,地质条件复杂,地下水位高。通过优化设计,基坑采用钻孔灌注桩加预应力锚杆复合支护体系,采用目前国内先进的单排深层搅拌防渗墙隔水,采用管井井点在基坑内外同时降低地下水位的降水措施,取得了理想的效果。     

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