The PolyMet Mine or NorthMet Mining Project is a proposed mining and processing operation in the
NorthMet Deposit in northeastern
Minnesota, United States,[1] six miles (10 km) south of
Babbitt, Minnesota.[2] The project is controversial with potential environment effects being a major concern.[3]
Summary
Three
open pit mines are planned with the deepest being about 700 feet. Grinding, separation and Sulphite
Excavated material not desired (waste rock) would be stored next to the pits in large, 20-story high piles
The hydrometallurgical process of flotation and autoclave leach the ore
Tailings, the leftover sand-like particles of rock that have been stripped of their economic metals in flotation, will be collected and pumped in slurry form to the tailings basin.
Some reclamation is planned and financial assurance plans are being made.[4]
Potential benefits
Profitable business operation for
Polymet Mining Corporation (corporate offices in Ottawa Canada) and major investors such as Swiss giant
Glencore
There are 275 million tons of proven and probable reserves grading 0.79 percent copper equivalent with Measured and Indicated Mineral Resources of 694. Large million tons grading 0.74 percent copper equivalent. Large quantities of
overburden, waste rock, and processing
tailings will be generated.
While some water processing is planned, elevated levels of mercury and aluminum are expected.
Contaminated waste water is planned to be contained. If leakage occurs, drainage would be through Partridge River, the Embarrass River, the St. Louis River, to Lake Superior.[6]
operations would permanently affect 912.5 acres of wetlands
4,016.3-acre decrease in vegetation and wildlife habitat in the NorthMet Project area
^"Executive Summary",
Environmental Impact Statement, Supplemental Draft(PDF), Minnesota Department of Natural Resources United States Army Corps of Engineers United States Forest Service, 2013, retrieved November 5, 2015
The PolyMet Mine or NorthMet Mining Project is a proposed mining and processing operation in the
NorthMet Deposit in northeastern
Minnesota, United States,[1] six miles (10 km) south of
Babbitt, Minnesota.[2] The project is controversial with potential environment effects being a major concern.[3]
Summary
Three
open pit mines are planned with the deepest being about 700 feet. Grinding, separation and Sulphite
Excavated material not desired (waste rock) would be stored next to the pits in large, 20-story high piles
The hydrometallurgical process of flotation and autoclave leach the ore
Tailings, the leftover sand-like particles of rock that have been stripped of their economic metals in flotation, will be collected and pumped in slurry form to the tailings basin.
Some reclamation is planned and financial assurance plans are being made.[4]
Potential benefits
Profitable business operation for
Polymet Mining Corporation (corporate offices in Ottawa Canada) and major investors such as Swiss giant
Glencore
There are 275 million tons of proven and probable reserves grading 0.79 percent copper equivalent with Measured and Indicated Mineral Resources of 694. Large million tons grading 0.74 percent copper equivalent. Large quantities of
overburden, waste rock, and processing
tailings will be generated.
While some water processing is planned, elevated levels of mercury and aluminum are expected.
Contaminated waste water is planned to be contained. If leakage occurs, drainage would be through Partridge River, the Embarrass River, the St. Louis River, to Lake Superior.[6]
operations would permanently affect 912.5 acres of wetlands
4,016.3-acre decrease in vegetation and wildlife habitat in the NorthMet Project area
^"Executive Summary",
Environmental Impact Statement, Supplemental Draft(PDF), Minnesota Department of Natural Resources United States Army Corps of Engineers United States Forest Service, 2013, retrieved November 5, 2015