PolyMet's NorthMet Mining Project


Dam Safety Permit
PolyMet's NorthMet Mining Project

DNR's Dam Safety Permit Program is required to regulate the construction, operation and maintenance of dams to protect public health, safety and welfare. The DNR regulates the construction and enlargement of dams, repair, alteration, maintenance, operation, abandonment and transfer of ownership through the dam safety permitting process. Minnesota Rules establish minimum standards and criteria for dam classification and regulation. These cover both initial permitting and ongoing regulatory oversight. These actions are administered and monitored by the DNR Dam Safety Unit.

PolyMet has submitted Dam Safety permit applications for the proposed NorthMet project.

DNR's technical experts have reviewed the applications for any major omissions. On May 16, 2017, PolyMet’s revised applications were sent out for review by technical experts from other units of government having jurisdiction in such matters, as required by MN Rule 6115.0250. DNR also sent the revised permit applications to the Bois Forte Band of Chippewa, the Grand Portage Band of Lake Superior Chippewa, and the Fond du Lac Band of Lake Superior Chippewa for review. After DNR completes its full review of the applications and considers the input from the other technical experts, we will determine whether to proceed with preparing draft dam safety permits. At a future date, the DNR will seek public review and input on draft permit decisions.

Where are we in the overall permitting process?

View timeline graphic (3 MB) PDF »
View timeline text only (1 MB) PDF  »

Permit-related Documents

State consultant reports
Added on May 16, 2017

Dam Safety Permit Application

Current Applications

Previous Applications

Reference documents

Final Environmental Impact Statement: NorthMet Mining Project and Land Exchange (link to final document webpage) »
Residue Management Plan v5 (40 MB) PDF »
Geotechnical Data Package Volume 2 – Hydrometallurgical Residue Facility v6 (42 MB) PDF »
Wetland Permit Application v2 (101 MB) PDF »
Project Description v9 (22 MB) PDF »
NPDES/SDS Permit Application Volume V – Tailings Basin and Beneficiation Plant (56 MB) PDF »
Wetland Data Package v11 (42 MB) PDF »
Plant Site Water Management Plan v5 (43 MB) PDF »
Plant Site Water Modeling Data Package Volume 2 v11 (122 MB) PDF »
Waste Characterization Data Package v12 (47 MB) PDF »
Plant Site Air Quality Management Plan v7 (2 MB) PDF »
Consideration of a West Pit Backfill Alternative Interagency Memorandum (1 MB) PDF »