Solution Mining of Halite
The stability and subsidence potential of solution-mined cavity clusters in a well-developed field in the Hutchinson salt were evaluated by AAI to provide a basis for modifications of existing state permit requirements. The mining method employed a cluster of four solution cavities overlying shale, without damage to the USDW. Initially, a central production well and the four surrounding injection wells were connected at depth via hydraulic fracturing. Sonic surveys revealed irregular cavity growth beneath several of the injection wells. The roof and wall stability of the cavity cluster were evaluated using rock strength data, sonic surveys, and computer modeling.