| Patents for E21C 41 - Methods of underground or surface mining; Layouts therefor (2,789) |
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| 11/30/1994 | EP0626501A1 An improved equipment useful for winning of ores particularly coal in longwall mining |
| 11/29/1994 | US5368369 Equipment useful for winning ores particularly coal in longwall mining |
| 11/10/1994 | DE4314775A1 Process for on-site remediation and chemical long-term stabilisation of deposits having sulphidic contents |
| 11/08/1994 | US5362133 Method of mining coal seams at a defined preset depth of cutting during ploughing with a cutter |
| 10/13/1994 | DE4311658A1 Method of making roadside packs and/or support pillars in underground mining, preferably coal mining |
| 10/05/1994 | CN1093140A Mining with rotative coal face |
| 08/25/1994 | DE4324433C1 Process for the sanitation of industrial sedimentation sites |
| 07/20/1994 | CN1089685A Process for single time mining for whole height using 3.15m single hydraulic supporting |
| 06/16/1994 | DE4242248A1 Cultivation of subsoil - by neutralising pollutants and incorporating nutrients, organic matter and sorbents |
| 05/11/1994 | CN1086578A Production of potassium from brine out of earth surface or underground through artificial vaporing pump |
| 04/27/1994 | EP0593675A1 Method and device for the extraction of blocks from a rock formation |
| 04/07/1994 | DE4335706A1 Sealing tar lake, esp. of brown coal gasification tar - by forming calcium carbonate surface layer to prevent emissions |
| 04/06/1994 | EP0590760A1 Undercut excavation method |
| 04/06/1994 | CN1084937A Method for coal mine hard heading tunnelling footage |
| 04/05/1994 | US5299674 Conveyor system and method employing a mobile belt support structure |
| 04/05/1994 | CA1328253C Equipment for raise mining |
| 03/31/1994 | WO1994007001A1 Programmable oscillating liquid jet cutting system |
| 03/17/1994 | CA2106162A1 Mining apparatus |
| 03/09/1994 | CN1083563A Stabilizing compositions and methods for stabilizing subterranean formations |
| 02/23/1994 | CN2157309Y Hydraulic quarrying apparatus |
| 02/23/1994 | CN1082660A Gas extracting method for coal mine tunnel |
| 01/06/1994 | WO1994000672A1 Stabilizing compositions and methods for stabilizing subterranean formations |
| 01/06/1994 | CA2138030A1 Stabilizing composition and methods for stabilizing subterranean formations |
| 01/04/1994 | US5275469 Method of working coal seams to a defined preset depth of cutting during ploughing with a cutter |
| 12/29/1993 | CN1080016A Verticle branching upword demix filling mining method |
| 11/30/1993 | US5265941 Underground mining system and method for developing longwall panel |
| 10/27/1993 | CN1077776A Non-electric detonating system for coal mine |
| 10/12/1993 | US5252808 Method and apparatus for recovering petroleum residues from storage sites |
| 10/06/1993 | CN1022297C Rock breaker for secondary breaking mine rock |
| 10/05/1993 | US5249844 Borehole mining process for recovery for petroleum from unconsolidated heavy oil formations |
| 09/16/1993 | DE4206424A1 Plant for introducing reinforcing layer under waste deposits - forms grid of drainage channels in floor of excavated layer and has movable support frame operated in area to be filled. |
| 08/10/1993 | US5234256 Cutting apparatus for mining operations with automatic control |
| 07/20/1993 | US5228517 Method and apparatus for collecting percolating fluids and apparatus for the installation thereof |
| 07/07/1993 | CN1021517C Electric hydraulic controlling method in stope |
| 06/15/1993 | US5219440 System for cutting and conveying coal and the like |
| 06/09/1993 | DE4139818A1 Clearing slag heaps from opencast or underground mining - requires installation of artificial abutment on upper part of heap as anchor for mining machinery. |
| 04/21/1993 | CN1071225A Caved trianglar coal recovery method |
| 04/14/1993 | CN2129824Y Exploitation well tool of under ground gravel stone |
| 04/08/1993 | DE4142165A1 Alignment control for coal face cutter with servo advancement - has displacement monitors on advancing rams and processor control to correct for non linearity after set number of cuts |
| 04/06/1993 | US5199816 System for isolating a dump |
| 04/06/1993 | US5199768 Method for developing thick beds of minerals |
| 03/30/1993 | US5197824 System for protecting ground water under a dump |
| 03/16/1993 | US5194689 Earth excavation using blast casting and excavating apparatus |
| 02/24/1993 | CN1069315A Method of mining coal layer in certain plaoughing and paring depth |
| 02/18/1993 | DE4226324A1 Verfahren und einrichtung zum abbau eines untertage-vorkommens Method and device for decomposing an underground-occurrence |
| 02/04/1993 | WO1993002274A1 Method and device for the extraction of blocks from a rock formation |
| 02/04/1993 | CA2113543A1 Method and device for the extraction of blocks from a rock formation |
| 01/21/1993 | WO1993001392A1 Rotary cutter for extracting hard rock |
| 01/19/1993 | US5180251 Underground protection underneath a dump |
| 01/06/1993 | CN1067705A Method mining thicker coal seam in funnel face |
| 12/30/1992 | CN1067477A Mining method by filling coarse wet sand on slope wall |
| 12/29/1992 | CA1312098C Method and equipment for narrow ore mining |
| 12/23/1992 | CN1067290A Room-and-pilar type caving for mine |
| 12/09/1992 | CN1066906A Nature coking coal mining method in magma invaded region |
| 12/01/1992 | CA2069843A1 Method of working coal seams to a defined preset depth of cutting during ploughing with a cutter |
| 11/25/1992 | CN2122935U Interlocking blasting machine |
| 11/24/1992 | US5165757 Method of strip mining |
| 11/17/1992 | US5163738 Apparatus for mining a seam, in particular of coal |
| 11/17/1992 | US5163510 Method of microbial enhanced oil recovery |
| 10/13/1992 | US5154489 Inclined surface mining method |
| 09/30/1992 | CN2117465U Explosively cutting and expanded blocking arrangement of underground water filtering steel tube |
| 09/22/1992 | US5149175 Thin seam mining and related sorting method |
| 09/10/1992 | DE4106799A1 Reducing contamination of ground water by lignite mining spoil - by covering spoil deposits with permeable material layer of low di:sulphide content, and at least in part, surrounding by sealing and/or buffer layers |
| 09/10/1992 | DE4106781A1 Reducing acid and sulphate content of water in overburden deposits - by introducing nutrients into overburden from lignite mines to promote growth of bacteria which reduce sulphate(s) to hydrogen sulphide and insoluble sulphide(s) |
| 09/10/1992 | DE4106780A1 Reducing acidic water formation esp. in coal tip - by locating iron di:sulphide-rich spoil below other waste |
| 09/10/1992 | DE4105595A1 Open cast spoil-heap reclamation method - which uses bucket-wheel excavator working to tree-rooting depth after spreading neutralising calcium |
| 09/08/1992 | CA1307298C Contamination reducing mining system for harmful ores |
| 09/02/1992 | CA2062077A1 Selective mining method and apparatus |
| 08/27/1992 | DE4039016A1 Freezing dam-water feed protection for open-cast mining - uses freezing body introduced via freezing holes in mining edge with circulating cold medium in drill bars |
| 08/25/1992 | US5140907 Method for surface mining with dragline and blast casting |
| 08/19/1992 | CN1063740A Shaft and raise construction method |
| 08/16/1992 | CA2060780A1 Surface mining |
| 08/12/1992 | CN2112687U Safety explosive bomb for hole bottom |
| 08/11/1992 | US5137337 Method for working steeply dipping vein ores with vertically downwards propagating pillars |
| 08/06/1992 | WO1992013172A1 Method of microbial enhanced oil recovery |
| 08/06/1992 | DE4202246A1 Coal-face slitting machine - provides directional signal sequence from switched electromagnets for equipment before and behind machine to be removed from intended path |
| 08/04/1992 | US5135286 Residue recovery process and apparatus |
| 07/23/1992 | WO1992010645A3 Method of mining a flooded mine gallery |
| 07/07/1992 | US5127710 Method of borehole hydraulicking of soluble minerals |
| 06/25/1992 | WO1992010645A2 Method of mining a flooded mine gallery |
| 06/03/1992 | CN1061640A Quick mining method by double-entry path of ore pillars |
| 05/20/1992 | CN1061259A Rock breaker for secondary breaking mine rock |
| 05/14/1992 | DE4036104A1 Solid landfill securing system - consists of drainage to be system with perforated casings and concentric tubes |
| 05/14/1992 | DE4036103A1 Refuse dump underground securing structure |
| 04/01/1992 | CN2100484U Scraping and absorbing salt-obtaining machinery |
| 03/20/1992 | CA2050018A1 Method for open-pit working and mining of coal and other minerals |
| 02/25/1992 | CA1296320C Mining process and apparatus |
| 02/20/1992 | DE4026048A1 Refuse dump underground securing structure |
| 02/19/1992 | EP0471158A2 Method and arrangement for preventing leakage of infiltration water from a waste dump |
| 02/18/1992 | CA2049234A1 System for protecting ground water under a dump |
| 01/22/1992 | CN1015311B Tool for grooving in hole |
| 01/02/1992 | DE4018822A1 Securing refuse dump by underground sealing structure |
| 12/19/1991 | DE4018824A1 Securing refuse dump by underground sealing structure |
| 12/18/1991 | EP0461472A2 Construction for sealing a waste dump and method for making said construction |
| 12/18/1991 | EP0461471A2 Method and apparatus for sealing a waste dump |
| 12/18/1991 | CN1015123B Caving mining method |
| 12/13/1991 | CA2044325A1 Underground protection underneath a dump |
| 12/13/1991 | CA2043907A1 System for isolating a dump |
| 09/10/1991 | CA1288735C Dragline apparatus |
| 07/24/1991 | CA2034782A1 Method of borehole hydraulicking of soluble minerals |