Second approach is the use of blasting to fill sinkholes. In this type of blast application, only free face for material movement is vertically downwards into the abandoned development. Field methodology and results of test blast program are discussed. Field Blast Summary Sheets. Analysis Using AML Blast Cost Model.
Surface collapses due to abandoned coal mines are a problem of great concern in southwest Kansas.
A reliable and cost-efficient method for detecting mined cavities is needed to evaluate prospective construction sites. The reflected event from top of coal exhibited reduced amplitude over water and coal ash slurry filled cavities. Instrument's void detection was not significant and better than random guess under relative simple range of conditions. The degree of success achieved in detecting coal at Marissa, IL indicates that the instrument may not be suited for detailed site characterization, but it may be useful as a preliminary investigation tool. Field installation and monitoring procedures were tested at 2 active planned subsidence mining operations and over 100 abandoned mines with an active subsidence event.