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In underground stowage, cavities created during rock salt or potash extraction are filled with specially treated mineral waste to protect areas at risk of surface subsidence and to stabilise the inner mine workings. Due to the geogenic structure of the rock salt and potash deposits, the mining areas are often located in a combination of water impermeable salt and clay layers. Thus, the use of waste in these cavities is characterised, in particular, by the fact that the pollutant potential is safely isolated from the environment over the long term.
We use waste such as flue gas residues or fly ash from industrial processes and waste incineration plants (EfW) as the basis for our underground stowage material – natural resources are not consumed (obligation under mining law). REMEX only uses tested formulations. For this purpose, we consistently implement the legal guidelines and ensure compliance through internal quality controls and external monitoring.
In addition to the delivery of stowing materials, we also offer competent advice and complete processing for domestic and foreign waste.
Each waste to be stowed first undergoes a suitability test in which the pollutant potential is investigated and the geo-mechanical properties for the development of the relocated construction material are evaluated. The audit, which is carried out by independent external experts, focuses on the structural, chemical and physical properties of the waste. It must be ensured that the materials do not pose a risk to employees and do not pollute the environment. Through handling and packaging in the upstream plants, stowing materials are produced from the waste according to agreed formulations, whereby focus is placed on the following characteristics:
The material recovery of fly ash and flue gas in underground stowage opens up clear advantages in terms of ecology and economy and it
ensures a permanent isolation of the stowing materials from the biosphere,
prevents the penetration of pollutants into the ecosystem,
prevents subsidence damage to the earth's surface,
offers a considerable safety advantage over landfill sites and
enables recovery instead of disposal.