Tuesday, September 11, 2007

Taconite - Back to the Earth

Yesterday taconite ironically was put back into the earth for a unique new economic business opportunity, (Jim Oberstar we told you we would do our part to help with northern Minnesota economic development opportunities). As you can see from the photos, the thermal storage area is slowly getting filled with taconite, it has a great energy density to it compared with sand, however, as you would expect, it cost more. Not to mention it is specifically unique to Northern Minnesota. The separation of the sand storage and the taconite storage was completed using 2 inches of EPS to keep the two types of material isolated. There are sensors being installed at low, middle and high points in the thermal storage area, we will be monitoring and documenting how the two materials perform over the years to come.

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