Umetco Minerals Corporation

David O Skiles

Donald J Hansen

Sundaresan Ramachandran

Method of operating a heap leach for leaching uranium and vanadium from a uranium-vanadium bearing ore formed into a relatively tall heap from a mixture of coarsely crushed ore and concentrated sulfuric acid which involves leaching the heap in sections with each section leached in multiple cycles following a predetermined procedure in which the heap is first leached with dilute acid followed by a strong acid application. The product effluent from the strong acid application is recycled a multiple number of times and advanced to the next section. Each section is then washed with fresh water.

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Grand Junction, CO, United States of America

David O Skiles