Presented paper

Mine Water Monitoring in Abandoned Mines at RAG Aktiengesellschaft

Witthaus, Holger (1); Melchers, Christian (2)
1: RAG Aktiengesellschaft, Essen, Germany; 2: Technische Hochschule Georg Agricola, Bochum, Germany

In the past, normally a lot of parameter from mine water in German hard coal mines could be derived by several tests, probes and analysis in the underground. The total shut down of production in 2018 implicates new challenge in deriving of physical and chemical parameter of mine water in situ. Finishing mining activities in the underground is going along to a limitation of alternative application of monitoring methods. A sampling of inflow to the mine, the description of individual chemical components and even the amount of local inflow to underground areas is not possible any more by underground inspection.

There is a data base of geo referenced results and in addition there are limited options for analytic measures in well pipes and drillholes from the surface.

This report is limited to the view at the current situation of closing all hard coal mines in Germany and is focussing on a project of cooperation between Technische Hochschule Georg Agricola (THGA) and RAG AG, to derive additional information about water rebound in former mines.

Starting the description with a summarising look to the results of specific research project of THGA and RAG AG, exemplarily results of an underground monitoring system are figured out. The system includes 4 probes at the Auguste Victoria mine, which had been developed for a long term observation that should cover a mine water rebound process over 2 or 3 decades. The probes are constructed to gather several parameters from the mine water as temperature, pressure electrical conductivity as well as flow velocity and flow direction.

Two years of data collection lead to some experience in interpretation of the signals in spite of the rebound process will endure for some 15 years more.

The developed system currently seems to be an option for improvement of the complete monitoring of mine water. Due to this fact and considering the time table of further activities of closing underground facilities, RAG decided to enlarge the measurements to 6 other underground areas intended to be closed in 2019. The actual situation of preparation and installation of the systems to Ibbenbüren mine, Prosper-Haniel mine, Reden shaft, Duhamel shaft, Zollverein pumping station and Heinrich pumping station is included to the report as well as a description of expectations, which could be achieved by application.

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