Section 78.56.160 - Moratorium on use of heap leach extraction process-Joint review by department of ecology and department of natural resources-Permanent prohibition of in situ extraction(1) Until June 30, 1996, there shall be a moratorium on metals mining and milling operations using the heap leach extraction process. The department of natural resources and the department of ecology shall jointly review the existing laws and regulations pertaining to the heap leach extraction process for their adequacy in safeguarding the environment.(2) Metals mining using the process of in situ extraction is permanently prohibited in the state of Washington.