May 15, 2023 – In Knoxville, Iowa, Marion County officials and residents claim that a sinkhole may be the result of a Bruening Rock Products limestone operation, according to a final site investigation report by the Iowa Department of Agriculture and Land Stewardship (IDALS). The sinkhole is located in the east right of way of 135th Place, just south of the limestone quarry, and extends onto a private landowner’s field. Bruening Rock Products disputes the claim. Read about it on WeAreIowa.com.