| Patents for E21C 41 - Methods of underground or surface mining; Layouts therefor (2,789) |
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| 07/23/1991 | US5033795 Method of mining a mineral deposit seam |
| 05/15/1991 | EP0328608B1 Process and device for subsequent incorporation of an underground seal under a refuse dump |
| 05/08/1991 | DE3932560A1 Face cutting coal mining machine - cuts face in several places and is followed by smaller machine which cuts intervening spaces |
| 04/16/1991 | US5007683 Method and equipment for narrow ore mining |
| 04/03/1991 | EP0419472A1 Process and device for quarrying and open-cast mining |
| 03/06/1991 | CN1011905B Method and equipment for thin ore mining |
| 02/26/1991 | CA1280614C Underground mining and quarrying operation through descending stripping and undercaving, and related installation |
| 02/06/1991 | CN1011523B Method and apparatus for digging high-dipping layers of mine, particularly high-dipping seams of coal |
| 01/23/1991 | CN1048739A Caving mining system |
| 01/16/1991 | CN1011252B Improved dragline apparatus |
| 12/25/1990 | US4979781 Bench mining method and apparatus |
| 12/25/1990 | US4979780 Mining or underground quarrying method and installation for implementing same |
| 11/28/1990 | EP0399771A1 Residue recovery system |
| 11/22/1990 | CA2016991A1 Residue recovery system |
| 11/06/1990 | CA1275913C Oil sands mining |
| 10/23/1990 | US4964675 Method of electro-hydraulic control of longwall mine units |
| 10/03/1990 | CN1045838A Method for converting solid kcl into liquid phase from k, mg salt mine in qinghai salt lake |
| 10/02/1990 | US4960175 Equipment for raise mining |
| 09/04/1990 | US4953915 Roof fall separating and removing apparatus and method for use in thin seam highwall mining |
| 08/23/1990 | DE3904709A1 Method of starting the working longwall face |
| 08/21/1990 | US4950106 Method and apparatus for installation of an underground seal beneath a garbage dump |
| 07/11/1990 | CN1043768A Ion-adsorpting local immersion-extraction method for mining rare-earth minerals |
| 07/03/1990 | US4938536 Conic mass caving structure and method |
| 06/20/1990 | CN1008463B Strip caving open stopping method and plant |
| 05/31/1990 | WO1990005834A1 Process and device for quarrying and open-cast mining |
| 05/31/1990 | DE3936681A1 Mobile rock crushing machine - has speed controlled to match speed of excavator which excavates rock |
| 05/03/1990 | DE3831206C1 Method of winning reserves in the vicinity of a shaft and shaft lining for carrying out this method |
| 04/11/1990 | CN1007533B Continuous retreating sectional open stope caving mining along the run of ore vein |
| 04/05/1990 | DE3911119A1 Mining method and machine equipment for carrying out the method |
| 03/21/1990 | CN1007282B Method of and device for carrying out wire bolting |
| 03/14/1990 | CN1040414A Electric-hydraulic controlling method in stope |
| 01/10/1990 | CN1038614A Tool for grooving in hole |
| 12/19/1989 | US4887935 Method of controlling the movement of a longwall excavation front, especially the face or breast of a coal seam |
| 12/13/1989 | EP0345290A1 Method and equipment for narrow ore mining |
| 11/09/1989 | DE3814197A1 Winning apparatus for underground mining, in particular for potash extraction |
| 11/07/1989 | US4878712 Hydraulic method of mining coal |
| 09/26/1989 | CA1260965A1 Bench mining method and apparatus |
| 08/23/1989 | EP0328608A1 Process and device for subsequent incorporation of an underground seal under a refuse dump |
| 06/06/1989 | US4836612 Stress control mining method and apparatus |
| 05/16/1989 | CA1254046A1 Method of and a device for carrying out wire bolting |
| 04/11/1989 | CA1252484A1 Mining method and apparatus |
| 03/09/1989 | WO1989002026A1 Stress control mining method and apparatus |
| 03/09/1989 | WO1989002009A1 Process and device for subsequent incorporation of an underground seal under a refuse dump |
| 03/09/1989 | DE3729140A1 System for the underground mining of minerals |
| 01/24/1989 | US4799738 Mining method for working large-scale mineral deposits by the caving system |
| 01/17/1989 | US4798769 Electrode supporting conduit tube for electrical heating of underground hydrocarbon resources |
| 01/17/1989 | US4798417 Method of separating the upper coal in seams |
| 11/22/1988 | US4785852 Conduct pipe covered with electrically insulating material |
| 10/06/1988 | DE3809768A1 Method and apparatus for extraction underground |
| 10/05/1988 | CN88100810A Method and equipment for thin ore mining |
| 09/22/1988 | WO1988007123A1 An equipment for raise mining |
| 08/30/1988 | CA1241271A1 Metal value recovery |
| 08/25/1988 | WO1988006225A1 Method and equipment for narrow ore mining |
| 05/03/1988 | CA1236128A1 Hydraulic mining method |
| 05/03/1988 | CA1236004A1 Method of extracting uranium ore |
| 04/14/1988 | DE3634095A1 Method and apparatus for stabilising friable rock formations in the head area of the face in underground mining |
| 04/12/1988 | CA1235060A1 Process for production of oil and gas through horizontal drainholes from underground workings |
| 03/02/1988 | CN86100824B Pillar-combinations for mining methods |
| 02/16/1988 | US4725096 Method of and a device for carrying out wire bolting |
| 01/05/1988 | CA1231106A1 Excavation and method of excavation |
| 12/23/1987 | EP0250286A1 Underground mining process using downwardly directed stoping and caving, and installation for carrying this out |
| 12/08/1987 | CA1230134A1 Hydraulic monitor protection apparatus |
| 11/24/1987 | US4708394 Methods of controlling the operation of mineral mining installations |
| 11/03/1987 | US4703798 In situ method for recovering hydrocarbon from subterranean oil shale deposits |
| 08/05/1987 | CN86106946A Improved dragline apparatus |
| 07/15/1987 | CN87100375A Strip caving open stoping method and plant |
| 07/14/1987 | US4679856 Mine self-advancing roof support and method of relocating a mine winning face equipped with self-advancing roof support |
| 07/14/1987 | CA1224164A1 Electrode supporting conduit tube for electrical heating of underground hydrocarbon resources |
| 07/14/1987 | CA1224014A1 Method of, and apparatus for melting sulphur |
| 05/19/1987 | US4666212 Metal value recovery |
| 05/19/1987 | CA1221989A1 Cutting machine |
| 05/13/1987 | CN86107284A Method of and a device for carrying out wire bolting |
| 04/30/1987 | DE3537086A1 Underwater brown coal mining plant - uses treatment at cutting point to prevent humin separation, and forms underwater embankment from separated soil |
| 04/23/1987 | DE3537162A1 Subaqueous underground mining |
| 04/16/1987 | DE3534306A1 Method and arrangement for the strip winning of coal |
| 04/15/1987 | CN85107561A Method and apparatus for digging high-dipping layers of mine, particularly high-dipping seams of coal |
| 04/08/1987 | CN85107072A Method of mining the deposits with maintenance of permanent control of deformation of the surface, especially within the range of the influence of mining. |
| 04/07/1987 | CA1220232A1 Open pit mining |
| 04/01/1987 | EP0216506A1 Roof bolting method |
| 03/25/1987 | CN85106152A Mining of large scale ore deposit by method of collapsing technique |
| 03/18/1987 | EP0214359A1 Posterior sealing employing mining techniques |
| 03/11/1987 | EP0213223A1 A method of mining the deposits with maintenance of permanent control of deformation of the surface, especially within the range of the influence of mining |
| 12/02/1986 | US4626031 Apparatus for loosening and/or breaking coal deposits, rocks, granular or lumpy material, or scrap |
| 10/29/1986 | CN85103513A Continuous retreating sectional open stope caving mining along the run of ore vein |
| 10/28/1986 | US4619762 Devices for recovering polymetal compounds discharged from a submarine hydrothermal source |
| 10/08/1986 | CN86100824A Pillar-combinations for mining methods |
| 10/01/1986 | CN85109637A Method and system of controlling the operation of a coal working machine |
| 09/16/1986 | US4611951 Process for reclamation of excavated mine sites |
| 09/16/1986 | US4611856 Two-level, horizontal free face mining system for in situ oil shale retorts |
| 09/16/1986 | US4611855 Method for collecting gas from subterranean formations |
| 08/26/1986 | US4607888 Method of recovering hydrocarbon using mining assisted methods |
| 08/05/1986 | US4603910 Method of blasting rock caverns with large cross-sectional area |
| 07/22/1986 | US4601518 Method of excavating rock caverns by blasting |
| 07/01/1986 | US4597609 Method of melting sulphur |
| 06/18/1986 | EP0184720A1 Underground mining method for mineral deposits |
| 06/17/1986 | US4595239 Oil recovery mining apparatus |
| 05/27/1986 | CA1204992A1 Conduct pipe covered with electrically insulating material |
| 05/20/1986 | US4589701 Cutting machine |
| 05/20/1986 | US4589700 Strip-auger method of mining thin seams of hydrocarbonaceous deposits |
| 04/29/1986 | US4585063 Oil shale retorting and retort water purification process |