1
Jinxing Ji, Christopher Andrew Fleming, Paul George West Sells, Ralph Peter Hackl: Method for thiosulfate leaching of precious metal-containing materials. Placer Dome Technical Services, Sheridan Ross P C, December 9, 2003: US06660059 (33 worldwide citation)

Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to cont ...


2
Marilyn Patricia Ann Hames, Timothy B Dimock, Edward William Drew Anwyll, Donald Duncan Young, Fredric Christopher Delabbio, Eric Jackson, Simon Mark Jackson: Mining method for steeply dipping ore bodies. Placer Dome Technical Services, Sheridan Ross P C, February 22, 2005: US06857706 (23 worldwide citation)

The present invention is directed to a mining method for steeply dipping orebodies. In the method, an excavator 152 is tethered to a deployment system 120 by one or more cables/umbilicals 144. The excavator 152 excavates slices 172a-h of the orebody 100 by moving generally up-dip, down-dip or a comb ...


3
James A King: Process for recovering platinum group metals from material containing base metals. Placer Dome Technical Services, Sheridan Ross PC, April 25, 2006: US07033480 (20 worldwide citation)

The process of the present invention recovers platinum group metal(s), such as platinum and palladium, from PGM-containing materials containing base metals, such as copper and nickel. The process controls sulfur levels by using solvent extraction 306 to remove acid in the nickel recovery circuit. Th ...


4
William M Moeny: Method and apparatus for a plasma-hydraulic continuous excavation system. Placer Dome Technical Services, Sheridan Ross P C, July 13, 2004: US06761416 (18 worldwide citation)

A plasma-hydraulic excavation system suitable for use in connection with mining operations is provided. According to the system, one or more groups of plasma-hydraulic projectors that include a reflector and a pair of electrodes are used to break an area of rock. The projectors include a connection ...


5
Jinxing Ji, Christopher Andrew Fleming, Paul George West Sells, Ralph Peter Hackl: Method for thiosulfate leaching of precious metal-containing materials. Placer Dome Technical Services, Sheridan Ross P C, June 27, 2006: US07066983 (16 worldwide citation)

Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to cont ...


6
James A King, Jinxing Ji: Autoclave using agitator and sparge tube to provide high oxygen transfer rate to metal-containing solutions. Placer Dome Technical Services, Sheridan Ross P C, April 9, 2002: US06368381 (16 worldwide citation)

The autoclave of the present invention includes an impeller having a conduit to recirculate or introduce a molecular oxygen-containing gas into the slurry. The outlets for the gas can be located in the blades of the impeller for thorough dispersion of the gas bubbles in the slurry. A sparge tube for ...


7
Ralph Peter Hackl, Jinxing Ji, Paul George West Sells: Method for thiosulfate leaching of precious metal-containing materials. Placer Dome Technical Services, Sheridan Ross P C, June 9, 2009: US07544232 (9 worldwide citation)

Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ heap leaching or lixiviants that include one or more blinding agents.


8
James A King, Jinxing Ji, Christopher Andrew Fleming, Cesare Giosue Ferron: Reduction of lime consumption when treating refractor gold ores or concentrates. Placer Dome Technical Services, Sheridan Ross P C, October 20, 2009: US07604783 (7 worldwide citation)

The present invention is directed to a precious metal recovery process in which basic ferric sulphates and/or jarosites are controlled by a number of mechanisms, including control of the oxidation reaction conditions in the first autoclave compartment, hot curing of the autoclave discharge slurry, a ...


9
Jinxing Ji, Christopher Andrew Fleming, Paul George West Sells, Ralph Peter Hackl: Method for thiosulfate leaching of precious metal-containing materials. Placer Dome Technical Services, Sheridan Ross P C, July 14, 2009: US07559974 (7 worldwide citation)

Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to cont ...


10
Jinxing Ji, Christopher Andrew Fleming, Paul George West Sells, Ralph Peter Hackl: Method for thiosulfate leaching of precious metal-containing materials. Placer Dome Technical Services, Sheridan Ross P C, April 27, 2010: US07704298 (6 worldwide citation)

Processes are provided for recovering precious metals from refractory materials using thiosulfate lixiviants. The processes can employ lixiviants that include at most only small amounts of copper and/or ammonia and operate at a relatively low pH, reduction of polythionates, inert atmospheres to cont ...