Cypress Studies Chloride Leaching for Clayton Valley Lithium Project

Cypress Development Corp. has completed the first stage in the scoping level study into the extraction of lithium using chloride- based leaching. Continental Metallurgical Services Inc. (CMS) prepared a large sample from the company’s Clayton Valley lithium project and conducted the acid leaching test. Samples of the leach solution and the initial and final solids were shipped for assay. The remaining steps of testing will focus on the treatment of the leach solutions and are expected to be completed by the end of the year.

Upon addition of acid, CMS observed vigorous frothing. The filtered leachate was yellow versus the lime green seen with the sulfuric acid leach. Notable in test was that the slurry separated into solid and liquids portion in the span of several hours, to the extent leach solution was decanted from the mixing tank with no filtration, which could be an advantage over sulfuric acid leach. Leach slurry samples were shipped to Pocock in Salt Lake for testing on solid-liquid separation. These results will be important in determining if changes in the filtration and tailings handling portions of the plant design will be warranted.

If the chloride leaching is successful and is indicated to be economically justified, steps within the lithium concentration and recovery process will require additional equipment in the pilot program to evaluate. Clayton Valley is a world-class resource of lithium-bearing claystone located adjacent to the Albemarle’s Silver Peak mine, North America’s only lithium brine operation.

As featured in Womp 2021 Vol 01 -