1
Nicholas Kalmar: Process for the in situ recovery of both petroleum and inorganic mineral content of an oil shale deposit. Owen Wickersham & Erickson, March 1, 1983: US04375302 (118 worldwide citation)

A process for obtaining useful products from an oil shale formation that has intermixed nahcolite and dawsonite. An aqueous solution of sodium hydroxide, containing a surfactant, is injected into the formation via wells. The sodium hydroxide reacts with the nahcolite to yield a sodium carbonate solu ...


2
Tham Min Jack, Closmann Philip Joseph: Recovering oil from a subterranean carbonaceous formation. Shell Oil Company, July 15, 1975: US3894769 (116 worldwide citation)

In a process for recovering oil from oil shale which comprises injecting a fluid A, such as steam, into contact with finely-divided, unconsolidated, solid particles in a rubbled oil shale chimney; withdrawing fluids from the chimney from a point above the injection point of fluid A, and adjusting th ...


3
Sidney T Fisher, Charles B Fisher: Electric induction heating of underground ore deposits. Barrigar & Oyen, October 26, 1976: US03988036 (44 worldwide citation)

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 transported to the surface, as by rapid solidif ...


4
Jalmer W Erickson: Underground in situ leaching of ore. Sheridan Ross Fields & McIntosh, August 25, 1981: US04285548 (14 worldwide citation)

An underground method for in situ leaching of mineral resource bodies is used to recover the mineral. The method comprises running a drift close to the resource body in such a manner as to minimize any effect on subsurface water; drilling long holes from the drift into the resource body at intervals ...


5
Joseph G Savins: In-situ uranium leaching process. Mobil Oil Corporation, A J McKillop, J F Powers Jr, M G Gilman, December 25, 1984: US04489984 (12 worldwide citation)

The present invention provides an improved process for the in-situ recovery of mineral values, particularly uranium, from subterranean deposits that exhibit heterogeneous permeabilities in the formation zones. Aqueous solutions of thickening agents or viscosity building agents are utilized to contro ...


6
Robert P Learmont: Method for the removal of radioactive waste during in-situ leaching of uranium. United States Steel Corporation, Arthur J Greif, October 18, 1977: US04054320 (10 worldwide citation)

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 then withdrawn either from the original injectio ...


7
Raymond J Jan: Process for recovering uranium and other base metals. Wyoming Mineral Corporation, A Mich Jr, October 9, 1984: US04475772 (8 worldwide citation)

Uranium and other base metals are leached from their ores with aqueous solutions containing bicarbonate ions that have been generated or reconstituted by converting other non-bicarbonate anions into bicarbonate ions. The conversion is most conveniently effected by contacting solutions containing SO. ...


8
R L Williams, Rene L Latiolais, John L Gabriel, Robert L Bouis: Method and apparatus for utilizing accumulated underground water in the mining of subterranean sulphur. Freeport Minerals Company, Fisher Christen & Sabol, June 12, 1979: US04157847 (8 worldwide citation)

Novel method and apparatus for utilizing, in the mining of subterranean sulphur by the Frasch process, the heat of water that has accumulated underground above at least a part of said subterranean sulphur from previous mining operations comprising subterraneanly recycling said accumulated undergroun ...


9
Charles H Jacoby: Energy conserving mining system and method. Occidental Minerals Corporation, Bean Kauffman & Bean, April 25, 1978: US04085971 (8 worldwide citation)

There is disclosed an improved system method for in situ extraction of mineral values from subterranean deposits of ores of the oxide; carbonate; sulphide, or other type ores which contain sought-for metal values and which evolve gas when reacted with suitable chemicals in solution and/or gaseous fo ...


10
Robert P Learmont: In situ solution mining technique. United States Steel Corporation, William L Krayer, April 4, 1978: US04082358 (8 worldwide citation)

A method of in situ solution mining is disclosed in which a primary leaching process employing an array of 5-spot leaching patterns of production and injection wells is converted to a different pattern by converting to injection wells all the production wells in alternate rows.