NDLI: Predicting Open Pit Mine Inflow and Recovery Depth in the Durvuljin soum, Zavkhan Province, Mongolia

Content Provider	Springer Nature Link
Author	Yihdego, Yohannes Paffard, Andrew
Copyright Year	2016
Abstract	Increasingly, mine issues and water resources are being managed on a watershed basis, while addressing problems at the local mine scale. A good example of this developed when empirical and analytical modelling of the potential inflow to an open pit mine in the Durvuljin soum, a region in northwest Mongolia, indicated that inflow would be on the order of 0.3 to 10.5 L/s. In this study, the radius of influence due to open pit mining was estimated to be between 0.6 and 3 km. Based on simulated drawdown contours and transient pit inflow figures that captured the impact of mining and groundwater inflow rate variations over a period of time, it appeared that advanced dewatering will not be required at this mine, unless currently unknown major fractured structures are intercepted. In-pit basal sumps and pumps should be sufficient to remove water from the mine floor. However, an assessment of the final pit level is also crucial to planning the post-mining surface and groundwater quality/eco-system and mitigation requirements during recovery. Our post-mining water table recovery estimate indicated that inflow will exceed evaporation and that a shallow lake will likely form. While such solutions, which do not rely on complex numerical models nor excessive input data, are not appropriate for all hydrogeologic situations, they are relevant to the conditions encountered at most mine sites.Bergbau und Wasserressourcen werden zunehmend im Maßstab der Einzugsgebiete bewirtschaftet, während Probleme im lokalen Bergbaumaßstab geregelt werden. Ein derartiges Beispiel zeigte sich bei empririschem und analytischem Modellieren des möglichen Wasserzulaufs in einen Tagbau in dem Durvuljin soum, einer Region in der nordwestlichen Mongolei. Demnach würde der Zulauf zwischen 0.3 und 10.5 L/s liegen. Der Radius des Absenkungstrichters wurde in dieser Studie auf 0.6 bis 3 km geschätzt. Simulierte Konturen des Trichters und transiente Zulaufvolumina erfassten die Auswirkung des Bergbaues und wechselnder Zuflussraten über die Zeit. Daraus ergab sich, dass bei diesem Bergbau keine Vorausentwässerung notwendig sein würde, wenn nicht derzeit unbekannte Störungen angeschnitten werden. Sümpfe und Pumpen sollte ausreichen, um Wasser von der Tagbausohle zu entfernen. Auch eine Abschätzung der Endteufe des Tagebauloches ist erforderlich, um die Qualität, Ökosysteme und Schadensminderung der Bergbaufolgelandschaft und des Grundwassers während der Aufspiegelung zu planen. Der Zufluss wird die Verdunstung übertreffen und vermutlich wird sich ein seichter See bilden. Obwohl derartige Lösungen, welche nicht auf komplexen numerischen Modellen und grossen Datenmengen beruhen, nicht für alle hydrogeologischen Gegebenheiten geeignet sind, können sie für die meisten Bergbaue sachdienlich sein.En forma creciente las situaciones en las minas y las reservas hídricas están siendo manejadas sobre la base de las cuencas en lugar del abordaje local en la mina. Un buen ejemplo de esto se desarrolló modelando, en forma empírica y analítica, la potencial irrupción de agua en una mina de cielo abierto en Durvuljin, una región en el noroeste de Mongolia; los resultados indicaron que la entrada de agua debía ser del orden de 0.3 a 10.5 L/s. En este estudio se estimó el radio de influencia de la minería a cielo abierto entre 0.6 y 3 km. Sobre la base de los contornos simulados y las figuras de irrupción transientes generadas por el impacto de la minería y las variaciones del flujo de entrada de agua subterránea sobre un período de tiempo, se encontró que no se requerirán desagotes avanzados en esta mina salvo que se intercepten estructuras fracturadas no conocidas actualmente. Los sumideros basales dentro del hoyo y las bombas deberían ser suficientes para eliminar el agua del piso de la mina. Sin embargo, una evaluación del nivel final en el hoyo es crucial para la planificación de los requisitos de la superficie post minería, de la calidad y ecosistema de las aguas subterráneas y de los requerimientos de mitigación durante la recuperación. Nuestra tabla de estimación de recuperación post minería, indicó que la entrada superará la evaporación y que probablemente se formará un lago poco profundo. Estas soluciones que no se basan en modelos numéricos complejos ni en excesivos datos de entrada, no son apropiadas para todas las situaciones hidrogeológicas, pero son relevantes en las condiciones encontradas en la mayoría de los sitios mineros.目前人们越来越重视在流域尺度进行采矿与水资源协调管理和在局部小尺度解决采矿问题。例如,经验模型和解析模型预测蒙古西北部Durviljin soum露天预测涌水量为0.3 ~ 10.5 L/s,露天矿影响半径为0.6 ~ 3km。同时,降深预测和非稳定流涌水量计算表明,除非采矿揭露未知大型断裂,开采期间将不需要进一步疏水。露天矿坑内水仓和水泵应该具有足够抽排矿坑水的能力。矿坑采后最终地下水位对采后地表水和地下水质恢复及生态恢复非常关键。采后水位恢复估算结果表明,矿坑涌水量将超过蒸发量并形成地表浅湖。虽然不依赖复杂数值模型和大量数据输入的经验与解析解并不一定适用于所有矿坑,但该解对绝大多数矿坑是可靠的。.
Starting Page	114
Ending Page	123
Page Count	10
File Format	PDF
ISSN	10259112
Journal	Mine Water and the Environment
Volume Number	36
Issue Number	1
e-ISSN	16161068
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-09-26
Publisher Institution	International Mine Water Association (IMWA)
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Pit lake Post-closure Mine rebound Mine water management Geology Water Quality/Water Pollution Hydrogeology Mineral Resources Ecotoxicology Industrial Pollution Prevention
Content Type	Text
Resource Type	Article
Subject	Water Science and Technology Geotechnical Engineering and Engineering Geology

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