Cornerstone Industrial Minerals, Inc. Tucker Hill perlite mine expansion project plan of operations amendment no. 7

"The Draft EIS analyzes the potential environmental impacts of the proposed mine expansion and three other alternatives on approximately 340 acres of BLM-administered lands in central Lake County, Oregon. This analysis will be used as the basis for approving, modifying, or denying the claimant's proposed amendment to their existing mining plan of operation"--Letter of transmittal.