| Patents for E21C 41 - Methods of underground or surface mining; Layouts therefor (2,789) |
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| 02/03/1983 | WO1983000357A1 A method of and apparatus for hydraulic mining |
| 01/25/1983 | US4370003 Temporary gas seal for gas level drift of an in situ oil shale retort |
| 01/18/1983 | US4368921 Non-subsidence method for developing an in situ oil shale retort |
| 01/18/1983 | US4368920 Method of thermal-mine working of oil reservoir |
| 01/18/1983 | US4368781 Method of recovering viscous petroleum employing heated subsurface perforated casing containing a movable diverter |
| 01/11/1983 | US4367985 Method of sealing salina excavations |
| 01/11/1983 | US4367901 Method for forming an in situ oil shale retort |
| 01/11/1983 | CA1139322A1 Method of mining |
| 01/04/1983 | US4366987 Method for forming an in situ oil shale retort with horizontal free faces |
| 01/04/1983 | US4366986 Flooding and pyrolyzing |
| 11/23/1982 | US4360235 Cutting and chiseling assembly for mining machine and method performed thereby |
| 11/23/1982 | US4360233 Method of bulking an in situ oil shale retort substantially full of fragmented shale |
| 11/02/1982 | US4357051 Withdrawal of gases and liquids from an in situ oil shale retort |
| 10/12/1982 | US4353598 Method of blasting pillars with vertical blastholes |
| 09/29/1982 | EP0061111A2 Method for the underground gasification of solid combustible materials |
| 09/21/1982 | US4350392 Coal extraction in a longwall working |
| 09/21/1982 | CA1132147A1 Open pit mining for tar sands |
| 09/14/1982 | US4349227 Mining system for in situ oil shale retorts |
| 08/31/1982 | US4346935 Method for fragmenting oil shale formation |
| 08/31/1982 | CA1130823A1 Longwall mining method designed to alleviate the earth pressure at the working face |
| 08/24/1982 | US4345794 Placement of explosive for forming in situ oil shale retort |
| 08/24/1982 | CA1130200A1 Down hole pump with bottom receptor |
| 08/18/1982 | EP0057711A1 Mineral winning machine and system. |
| 08/10/1982 | CA1129337A1 In situ processing of mined oil shale |
| 08/03/1982 | CA1128967A1 Suface mining method |
| 07/20/1982 | US4340254 Method of mining heavy coal seams in two or more benches |
| 06/15/1982 | CA1125795A1 System for undersea recovery of hydrocarbons |
| 06/08/1982 | US4333684 Recovering oil from in situ shale retort |
| 04/27/1982 | US4326752 Method for forming an in situ oil shale retort |
| 04/27/1982 | US4326751 Blasting to a horizontal free face with mixing of fragments |
| 04/27/1982 | CA1122518A1 Recovery of bitumen from tar sand material |
| 04/06/1982 | US4323281 Method of surface mining |
| 04/06/1982 | CA1121262A1 Method for explosive expansion toward horizontal free faces for forming an in situ oil shale retort |
| 03/23/1982 | US4320994 Preparation of grout for stabilization of abandoned in-situ oil shale retorts |
| 03/04/1982 | WO1982000680A1 Mineral winning machine and system |
| 03/02/1982 | US4317492 Method and apparatus for drilling horizontal holes in geological structures from a vertical bore |
| 02/23/1982 | US4316682 Ore carrier |
| 02/16/1982 | US4315657 Gas seal for an in situ oil shale retort and method of forming thermal barrier |
| 02/16/1982 | US4315656 Method for reducing porosity of rubblized oil shale |
| 02/16/1982 | CA1118458A1 Method of relieving earth pressure in a working area |
| 01/12/1982 | US4310197 Mining and bolting method and apparatus |
| 01/12/1982 | CA1116187A1 Method and apparatus for mining uranium deposits of variable concentrations |
| 01/05/1982 | US4309130 Mine roof support |
| 01/05/1982 | US4309059 Mining method |
| 12/29/1981 | US4307978 Method of relieving earth pressure in a working area |
| 12/01/1981 | US4303273 In situ oil shale retort with a generally T-shaped vertical cross section |
| 11/24/1981 | CA1112999A1 Method for recovering subsurface earth substances |
| 11/17/1981 | US4300800 Method of rubbling a pillar |
| 11/17/1981 | CA1112561A1 Method of thermal-mine recovery of oil and fluent bitumens |
| 11/10/1981 | US4299286 Displacement |
| 10/27/1981 | US4296969 Thermal recovery of viscous hydrocarbons using arrays of radially spaced horizontal wells |
| 10/27/1981 | US4296968 In situ oil shale retort having horizontally offset pillars |
| 10/13/1981 | US4294563 Thermally insulated bulkhead for in situ oil shale retort |
| 09/22/1981 | US4290651 Surface mining method |
| 09/22/1981 | US4290649 Method for explosively expanding a pillar for forming an in situ oil shale retort |
| 09/01/1981 | US4286822 Underspoil slurry haulage |
| 08/25/1981 | US4285547 Integrated in situ shale oil and mineral recovery process |
| 08/11/1981 | US4283088 Thermal--mining method of oil production |
| 08/04/1981 | US4281878 Method for loading explosive laterally from a borehole |
| 08/04/1981 | US4281877 Rock bolting techniques for forming an in situ oil shale retort |
| 07/28/1981 | US4280732 Method and apparatus for mining |
| 07/21/1981 | CA1105379A1 Thermal-mining method of oil production |
| 07/21/1981 | CA1105378A1 Thermal-mining method of oil production |
| 07/14/1981 | US4278137 Apparatus for extracting minerals through a borehole |
| 06/30/1981 | US4275926 Down hole pump with bottom receptor |
| 06/17/1981 | EP0030430A1 Underground gasification of coal |
| 06/09/1981 | US4272128 Method of creating a safe environment in salt mining |
| 06/09/1981 | CA1102687A1 Method for establishing a combustion zone in an in situ oil shale retort having a pocket at the top |
| 05/26/1981 | US4269449 Method for preparing an oil shale deposit for in situ retorting |
| 05/19/1981 | US4268088 Shortwall mining of trona |
| 05/19/1981 | CA1101371A1 Chemical comminution of coal with so.sub.2 |
| 05/12/1981 | US4266826 In-situ recovery of constituents from fragmented ore |
| 05/06/1981 | EP0028124A1 Method of mining |
| 05/05/1981 | US4265570 Mine roof control |
| 05/05/1981 | US4265486 Apparatus for in-situ retorting |
| 05/05/1981 | US4265485 Thermal-mine oil production method |
| 04/28/1981 | CA1100034A1 Subterranean mining |
| 04/21/1981 | US4262965 Triangular blasting into limited voids for vertical free face retorts |
| 04/21/1981 | CA1099700A1 Method for producing chambered blast holes |
| 04/14/1981 | CA1099301A1 Mine enhanced hydrocarbon recovery technique |
| 03/24/1981 | US4257650 Method for recovering subsurface earth substances |
| 03/11/1981 | EP0024418A1 Process for sorting coarse-to-fine material according to the chemical composition thereof. |
| 03/10/1981 | US4255067 Disposal of liquid waste and recovery of metals therefrom |
| 03/10/1981 | US4254993 Mining apparatus |
| 03/03/1981 | US4253703 Method for mining coal using ammonia and nitrifying bacteria |
| 02/24/1981 | US4252374 Determining the locus of a processing zone in an oil shale retort by shale oil composition |
| 02/24/1981 | CA1096301A1 Operation of an in situ oil shale retort |
| 02/24/1981 | CA1096300A1 In situ recovery of shale oil |
| 02/17/1981 | CA1095831A1 Fragmentation of subterranean formations |
| 02/03/1981 | CA1095092A1 Mining method |
| 01/27/1981 | US4247229 Mining method and apparatus |
| 01/27/1981 | CA1094584A1 Method of mining of thick seam materials |
| 01/13/1981 | US4244624 Method for reclaiming highwalls at mining sites with partially mined ore veins |
| 12/30/1980 | US4241952 Surface and subsurface hydrocarbon recovery |
| 12/30/1980 | US4241951 Leaching with an acid forming gas and polyelectrolyte solution |
| 12/16/1980 | US4239285 Method of attenuating airblast from detonating explosive in an in situ oil shale retort |
| 12/16/1980 | US4239284 Situ retort with high grade fragmented oil shale zone adjacent the lower boundary |
| 12/16/1980 | US4239283 In situ oil shale retort with intermediate gas control |
| 12/09/1980 | US4238136 Formation of in situ oil shale retort with void at the top |
| 11/18/1980 | US4234232 Methods of and apparatus for mining and processing tar sands and the like |