Jurisdiction: Abandoned Mine Lands
2019 Completed Projects Archive
2019 Exploratory Drilling AML Project
This project involved rotary drilling and casing to locate and characterize underground mines in parking lots and near buildings at an industrial subdivision near Williston. The bid opening for this project was held March 12. The project was conducted between April and July 2019. The estimated contract cost for this project was $400,000.
2019 Morton County Phase 2 AML Project
This 30-acre project eliminated about 4,400 feet of dangerous final pit highwalls at five abandoned surface coal mines in Morton County. These mines have steep highwalls about 10-40 feet high. The reclamation work involved backfilling the highwalls with earthen material from adjacent spoil piles and borrow areas. About 150,000 cubic yards of earthen material were moved in the reclamation process. The bid opening for this project was held April 18, 2019. The project was conducted between June and September 2019. The estimated contract cost for this project was $332,350.
2019 Williams County Road 9 Phase 7 and Noonan AML Project
This two-site AML drilling and grouting project stabilized collapsing underground coal mines at an industrial subdivision near Williston and along roads and trails near Noonan. Project work included rotary drilling, casing drilled holes and pumping cementitious grout and foamed sand to stabilize underground mine voids and reduce the potential for mine collapse and sinkholes. Testing of the grout and sand materials were covered under a separate contract. The bid openings for this project were held April 18, 2019. The project was conducted between June and August 2018. Estimated total contract costs for this project were $1 million.