Frongoch Mine is near the village of Pont-rhyd-y-groes, Ceredigion, situated in the middle of Wales, in UK.

This site was selected because the current raw water quality fails to meet the required water quality standard for metals, which is exactly the type of watercourse that this project is targeting. This will provide reliable data for scale-up purposes and cost engineering without upsetting the natural flow of water in the local environment. The task it will be held in two main steps that will be executed during May 2019 and April 2020:

• Implementation of the METP plant in Wales, which will demonstrate METP plant at the first deployment site in Wales.
• Operation and performance evaluation of the METP plant in Wales, which will demonstrate its capacity to correctly treat the mining wastewaters as well as to reduce the environmental impact that these effluents are currently causing.

Schluesselstollen is a mining tunnel for drainage of the former Mansfeld copper shale district in Saxony-Anhalt, a copper mining area in Germany.

This area was selected because it is one of the longest of its kind in Europe: a monument to the art of the miners of the 18th and 19th centuries. It carries by far the largest quantities of water and thus relevant, largely geogenically caused and anthropogenically overshaped metal and salt loads. Since 1981, the remaining water flows out of the abandoned mines via the Schluesselstollen to the creek Schlenze before it flows into the river Saale.

• Implementation of METP plant in Germany, which will demonstrate the METP plant at the second deployment site in Germany.
• Operation and performance evaluation of the new treatment plant in Wales, which will demonstrate its capacity to correctly treat the mining wastewaters from a German potash mine, as well as to reduce the environmental impact that these effluents are currently causing.