Requirements for safe storage of reactive mine waste modified.

HF 3050 modifies Minnesota's requirements for safely storing reactive mine waste, directly affecting nonferrous metallic mining operations. The bill requires mining companies to conduct chemical and physical waste characterization before and during mining, and mandates that waste storage facilities be designed by Minnesota-registered engineers to meet water quality standards. Key provisions include designing facilities to either modify waste characteristics or collect and treat drainage water to prevent harmful pH changes in water sources. The bill repeals an outdated rule (Minnesota Rules 6132.2200) and updates engineering standards for waste storage. These changes aim to prevent environmental harm from mine waste by ensuring facilities meet current water quality protections.