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| Number | Title | Issue Date |
| 7540693 | Method for pillar recovery in chamber-and-pillar working and tubbing unit for pillar recovery Methods for pillar recovery in chamber-and-pillar working materials in underground stratified beds are disclosed. Additionally, tubbing units for pillar recovery in chamber-and-pillar working of materials in underground stratified beds are disclosed. An extraction d... | 06/02/2009 |
| 7207632 | Shield system for coal mining A mining system for remotely mining ores and minerals which protects against falling rock and allows evacuation of a miner and conveying system in the case of a cave in. A shield is advanced into a mine. Within the shield, the miner and conveying system are also adv... | 04/24/2007 |
| 6910834 | Mine prop A mine prop is comprised of an elongate tube having a slenderness ratio that would generally allow buckling or kneeling of the elongate tube when exposed to a sufficient axial force. A plurality of elongate support members having a length less than the elongate tube... | 06/28/2005 |
| 4420278 | Heading shield The roof of a heading cut by a continuous mining machine is supported by cantilevered roof beams forming part of a shield. There are at least two sets of roof beams which can be raised and lowered separately by means of hydraulic rams. When one set is low... | 12/13/1983 |
| 4073151 | Mine roof support assemblies A mine roof support assembly comprises a pair of adjacent mine roof support units and apparatus for guiding and aligning these units. Each of the units has a floor sill and telescopic props for bracing against the roof of a mine excavation. Shifting ram m... | 02/14/1978 |
