The shaft checklist may be useful to reclamation investigators. Ejector developed which solves technical problems of pneumatically backfilling abandoned mines from the surface. Ejector system uses air to turn the sand at the bottom of a borehole thus presents no surface to wear. Design parameters and test results are presented in the report. Objective of blasting for AML work is the collapse of underground development from surface.
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.