Abstract: Method and apparatus for assisting recovery of desired materials from ore are disclosed. Desired material liberation is assisted by applying high power microwave energy to the ore. Application of high power microwave energy causes materials within the ore to react with gaseous compounds in the air to form a plasma. The plasma is retained proximate the ore to facilitate heating of the ore to induce stress formation within the ore and/or mineral oxidation of ore materials. The additional heat, stresses, and fractures caused via application of the high power microwaves facilitate desired material liberation from the ore during subsequent material extraction processes.