Patents by Inventor Nathan Stubina

Nathan Stubina 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).

  • Recovery of gold from roaster calcine leach tailings
    Patent number: 9194023
    Abstract: A method to recover gold lost in roaster calcine-leach tailings, due to the formation of cyanide refractory compounds or morphologies during the roasting process. The process can include acid leaching of magnetic concentrate from roaster leach tailings, combining the acid leach slurry to the pre-acidulation tank for pressure oxidation feed, acid pressure oxidation of the pressure oxidation feed, and recovery of gold.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: November 24, 2015
    Assignee: Barrick Gold Corporation
    Inventors: Qiankun Wang, Nathan Stubina, Wayne Douglas, Todd Esplin, Jodi Esplin, Sajan Bhakta
  • RECOVERY OF GOLD FROM ROASTER CALCINE LEACH TAILINGS
    Publication number: 20140112823
    Abstract: A method to recover gold lost in roaster calcine-leach tailings, due to the formation of cyanide refractory compounds or morphologies during the roasting process. The process can include acid leaching of magnetic concentrate from roaster leach tailings, combining the acid leach slurry to the pre-acidulation tank for pressure oxidation feed, acid pressure oxidation of the pressure oxidation feed, and recovery of gold.
    Type: Application
    Filed: October 23, 2013
    Publication date: April 24, 2014
    Applicant: Barrick Gold Corporation
    Inventors: Qiankun Wang, Nathan Stubina, Wayne Douglas, Todd Esplin, Jodi Esplin, Sajan Bhakta