| abstract |
A mining method includes removing material to be mined from one wall of a mine, and spraying a foam of plastic, polystyrene, polyurethane, or cement onto an opposite wall to continuously fill the mined cavity, except for the required immediate working area of the mining machinery. The foam controls roof fall and earth subsidence into the mined area and obviates the need for temporary roof support apparatuses and the required attending and maintaining personnel. Since the foam entirely replaces the mined material and provides its own roof support, the entire deposit area can be safely and efficiently mined. |