Nyrstar – Cumberland

The Cumberland zinc mine is part of a mining complex (Nyrstar Tennessee Mines) belonging to the Nyrstar company. It is a room and pillar type underground mine with a depth of about 500m. The deposit is located in paleo-karst, in a surrounding rock composed of limestone.

In certain places of the mine, the paleo-karst are still present and the calcite, which was mobilized with the zinc, is dissolved. Consequently, during the opening of the galleries, significant water infiltration sometimes causes problems. Also, the H 2 S content of groundwater is excessively high and areas where water infiltrates require increased ventilation.

Our firm has been carrying out work since 2014 in this mine. Various tests were carried out in order to understand the progress of underground water inside the karsts and thus to orient the mining operation and the dewatering. Currently, a few critical areas have been identified and a dewatering program is being analyzed.

Photo credit : Nyrstar

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