| 摘要 |
A method of mining a seam of rigid hydrocarbonaceous containing mineral such as oil shale or coal whereby essentially complete recovery of the mineral deposit is possible. This method comprises the steps of apportioning the seam into one or more working horizons and extracting from about 15 to about 85 percent of the mineral in a horizon using a room and pillar mining technique. The void areas resulting from the above mining operation are then filled with concrete, which is formed from cement made from spent residue and aggregate comprised of additional spent material. After the void areas are filled the remaining mineral is removed and additional concrete is deposited. Subsequently, an adjacent horizon, either above or below the initial horizon, is excavated by repeating the above steps until essentially all of the mineral deposit is recovered.
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