Patents by Inventor K. M. Le Vier

K. M. Le Vier has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for treating ore having recoverable gold values and including arsenic-, carbon- and sulfur-containing components by roasting in an oxygen-enriched gaseous atmosphere
    Patent number: 5123956
    Abstract: Recovery of a precious metal value from refractory carbonaceous and sulfidic ores, concentrates or tailings which also include arsenic-containing components is improved by roasting the ore or ore concentrate in an oxygen-enriched gaseous atmosphere having an initial oxygen content from about 25 percent (by volume) to about 65 percent (by volume) while maintaining a reaction temperature of less than about 600 degrees Celsius during the roasting and while maintaining a minimum amount of iron to react with arsenic and for forming ferricarsenate; thereafter recovering a thus-roasted ore as calcine, whereby the calcine is amenable to recovery of precious metal values in it; gold ores are preferred candidate ores.
    Type: Grant
    Filed: April 12, 1991
    Date of Patent: June 23, 1992
    Assignees: Newmont Mining Corporation, Newmont Gold Company
    Inventors: Rene R. Fernandez, K. M. Le Vier, Anthony L. Hannaford, Gopalan Ramadorai