Blasting for Abandoned Mine Land Reclamation (Closure of Individual Subsidence Features and Erratic, Undocumented Underground Coal Mine Workings).
NTIS: PB 91-169847 Available for Reference At Bureau Libraries :391 pages
This study has examined the feasibility of blasting for mitigating various abandoned mine land (aml) features on aml sites. The investigation included extensive field trial blasts at sites in North Dakota and Montana. A blasting technique was used that was based on spherical cratering conepts. At the Beulah, North Dakota, site, 13 individual vertical openings (sinkholes) were blasted with the intent to fill the voids. The blasts were designed to displace material laterally into the void. Good success was had in filling the sinkholes. At the white site in Montana erratic underground rooms with no available documentation were collapsed. An adit leading into the mine was also blasted. Both individual room blasting and area pattern blasting were studied. A total of eight blasts were fired on the 1-acre area. Exploration requirements and costs were found to be extensive. Field procedures and methods are reported. High-speed camera films and seismograph readings were taken for most blasts. Results of the test programs are analyzed. Conclusions are provided concerning the technical and cost feasibility of blasting for aml reclamation.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 91-169847; Available for Reference At Bureau Libraries
Calder & Workman, Inc.