STUDY: mine under Hideaway Hills could extend below I-90

Hideaway Hills SuitBLACK HAWK, S.D. — Montana Technical University recently finished a geophysical study of the Hideaway Hills subdivision, confirming that there are no voids underneath Daisy Drive.

Montana Tech was asked by Fitzgerald Law Firm – which represents a number of Hideaway Hills residents in their lawsuit against the State of South Dakota, Meade County, and the developers of the subdivision – to determine the presence of additional gypsum, voids, and mines beneath other homes in the subdivision.

However, the study’s findings show a new area of concern: Interstate 90.

“The results show that it is very likely that the mine extends well beyond the known (mapped) areas on the northeast, east, and southeast side. Based on the information obtained in this research, there is also the possibility that the mine extends below the interstate,” MTU wrote in a press release.

The DOT reported back in August 2020 that engineers – working within limitations of accessibility, budget, and schedule – found no voids under the interstate, deeming it safe. 

The MTU team says they recommend further study in the area.

In April 2020, 12 families were displaced after two sinkholes opened in the Hideaway Hills subdivision of Black Hawk, revealing a gypsum mine.

More information on MTU’s findings is available below:

Montana Tech Study Press Release

Contract M21-034- MTU Final Report

DOT Geotechnical Evaluation I-90

Categories: Local News, South Dakota News