Last week I talked about an area in northeastern Minnesota called the Iron Range, where health officials have identified unusually high numbers of mesothelioma cases. The Iron Range is a mining area.

The report, which was published by WorkDay Minnesota, noted that 58 people in that area have died from mesothelioma. As a result, the Minnesota legislature is proposing a special meso study in cooperation with the University of Minnesota.

On March 6, the Duluth News Tribune published an article about a related air-quality issue in Silver Bay, Minn. The Tribune reports the Sierra Club and Save Lake Superior Association are pursuing a lawsuit upholding the air standard that compares asbestos fiber levels near Silver Bay to the air in St. Paul, Minn.

The report notes that asbestos-like fibers have been found in the ore mined on the eastern Iron Range, which is processed into taconite by Northshore Mining Co. in Silver Bay.

The Tribune says the environmental groups report violations of the control city air standard, with Silver Bay air showing higher asbestos levels than St. Paul air.