The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 09, 1990
Filed:
Aug. 03, 1988
Applicant:
Inventors:
Jesus W Perez, New Orleans, LA (US);
Melvin J Barrois, Belle Chasse, LA (US);
Thomas H McCord, Harvey, LA (US);
Gregory R O'Neil, Marmion, AU;
Assignee:
Freeport-McMoRan, Inc., New Orleans, LA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C22B / ;
U.S. Cl.
CPC ...
75313 ; 75747 ; 75735 ; 75737 ; 75324 ; 423 29 ;
Abstract
An agglomerative heap leaching method for recovering gold, silver or other metals from low grade refractory ores. Hypochlorite compounds are incorporated directly into the ore agglomerates as they are formed. This provides ample time and opportunity for the hypochlorite to destroy, modify or passivate refractory components of the ore thereby improving metal recovery in the subsequent cyanide leaching step.