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| Number | Title | Issue Date |
| 4071278 | Leaching methods and apparatus In a leaching process to recover a selected element or mineral from a gangue, an AC current is applied to the mixture to accelerate the rate at which chemical reactions occur. If the treated material is located in a subsurface earth formation, the AC curr... | 01/31/1978 |
| 4066297 | Process for the recovery of uranium The present invention relates to a process for the solution mining of uranium from a subterranean formation. More specifically, the invention relates to the injection of an alkaline leach solution undersaturated in carbonates into a subterranean formation... | 01/03/1978 |
| 4065183 | Recovery system for oil shale deposits A process for the in-situ recovery of hydrocarbon, carbon monoxide, and hydrogen values and associated minerals from subsurface oil shale deposits is provided by forming a gas-tight retort chamber and injecting it with a hot, pressurized gas followed by a... | 12/27/1977 |
| 4054320 | Method for the removal of radioactive waste during in-situ leaching of uranium In the in-situ leaching of valuable minerals such as uranium, a leaching solution is injected into the mineral-bearing formation, permitted to remain in contact with the formation to effect the solubilization of desirable mineral values therefrom, and the... | 10/18/1977 |
| 4045084 | In-situ mining of copper and nickel A process is disclosed for in-situ mining of copper from a subterranean ore body characterized, at least in part, by the presence of a sulfidic ore and by natural, microscopic fracture openings. The process comprises forcing a stable, two-phase lixiviant ... | 08/30/1977 |
| 4043599 | Acid preinjection to decrease instantaneous acid consumption in in-situ mining This invention pertains to a method for in-situ mining of copper values from ore formations and, more particularly, this invention pertains to oxidative in-situ mining of copper wherein, for example, an oxygen-acid, a ferric iron-acid or a nitrate-acid li... | 08/23/1977 |
| 4032194 | Method for the production of minerals The present invention relates to an improved method for the solution mining of a mineral from a subterranean formation. More specifically, the invention relates to an improved method which enhances significantly the recovery of a mineral from a subterrane... | 06/28/1977 |
| 4032193 | Coal disaggregation by basic aqueous solution for slurry recovery This invention is a process for treating an underground formation of coal by contacting the coal with a basic aqueous solution for a time sufficient to disintegrate at least a portion of the coal formation. Subsequently, at least some of the disintegrated... | 06/28/1977 |
| 4026359 | Producing shale oil by flowing hot aqueous fluid along vertically varied paths within leached oil shale In producing shale oil from a relatively permeable leached zone within a subterranean oil shale deposit, hot aqueous fluid is flowed between wells along paths which are vertically varied. An initial flow between near-bottom injection and production locati... | 05/31/1977 |
| 4018481 | Gasification of coal in situ This invention relates to the production of combustible gases from coal in situ, in which one or more passages are established between the surface of the ground and an underground coal deposit. The coal is set afire and the fire is sustained by injection ... | 04/19/1977 |
| 4017119 | Method for rubblizing an oil shale deposit for in situ retorting A method for rubblizing an oil shale deposit that has been formed in alternate horizontal layers of rich and lean shale, including the steps of driving a horizontal tunnel along the lower edge of a rich shale layer of the deposit, sublevel caving by fan d... | 04/12/1977 |
| 4007964 | Preferential solution mining process Disclosed is a method of preferentially solution mining potassium chloride from a stratified subterranean deposit of potassium chloride and sodium chloride where a plurality of strata are present in a single common solution mining cavity. According to an ... | 02/15/1977 |
| 3999803 | In situ leaching of explosively fractured ore bodies Producing a fracture network in deep rock, e.g., in an ore body, by detonating explosive charges sequentially in separate cavities therein, the detonations producing a cluster of overlapping fracture zones and each detonation occurring after liquid has en... | 12/28/1976 |
| 3998492 | Method for selectively extracting magnesium chloride hexahydrate from magnesium chloride hexahydrate bearing materials in situ by solution mining A method of separating and removing magnesium chloride hexahydrate from deep subterranean salt formations containing magnesium chloride hexahydrate, such as a carnallite bed or a bischofite bed, wherein one or more holes are drilled or provided through an... | 12/21/1976 |
| 3990513 | Method of solution mining of coal A solvent of coal is pumped through pipes drilled into the earth to a coal seam. The coal is digested or dispersed into the solvent and solvent recycle, and is thereafter pumped as a solution up to the surface and processed to remove the coal from the sol... | 11/09/1976 |
| 3988036 | Electric induction heating of underground ore deposits A method of extracting metal from an underground ore body. The body is heated by electric induction to a temperature sufficient to break up the metallic ore compound and liquefy the metal. The metal flows into production wells where it is collected and tr... | 10/26/1976 |
| 3980339 | Process for recovery of carbonaceous materials from subterranean deposits Subterranean mineral deposits, such as oil shale or the like, are prepared for in-situ retorting by selectively mining out an area at the base of the deposit leaving an overlying deposit supported in a suitable manner such as by a plurality of pillars. Th... | 09/14/1976 |
| 3967853 | Producing shale oil from a cavity-surrounded central well In producing shale oil by circulating hot fluid into and out of void spaces within a subterranean oil shale, a plurality of cavities are formed around a central well, the cavities and the well are interconnected by leaching an areally extensive void space... | 07/06/1976 |
| 3966541 | Concentration of underground brines in situ by solar evaporation A process is provided for the recovery of chemicals, such as chlorides, sulfates, carbonates and borates of such alkali metals as sodium and potassium, among others, from underground brines associated with an ore body containing said chemicals, wherein th... | 06/29/1976 |
| 3957306 | Explosive-aided oil shale cavity formation The forming of a rubble-containing cavity within a subterranean oil shale is improved by: leaching water-soluble minerals to form an areally extensive void in or above an upper portion and an areally extensive permeable zone or void within or contiguous w... | 05/18/1976 |
| 3941422 | Method of interconnecting wells for solution mining A method of connecting wells for the purpose of producing salt by solution mining. Two wells are drilled into the salt bed, one of which is drilled in the conventional manner, that is, essentially vertically and the other of which is drilled from a point ... | 03/02/1976 |
| 3941679 | Separation of hydrocarbonaceous substances from mineral solids Methods of and apparatus for separating hydrocarbonaceous substances from mineral solids with which they are mixed, in situ or after they have been removed from the geological formation in which they occur. A solvent extraction technique is employed; and ... | 03/02/1976 |
| 3937520 | In situ mining using bacteria Mineral values are recovered in situ by generating a leaching agent in the formation containing the mineral to be recovered.... | 02/10/1976 |
