![]() ![]() The small mines were opened on local, relatively high grade areas, within an extensive area of low grade magnetite-bearing rock. The mine site was chosen after an extensive dip needle (sort of a crude magnetometer) survey of zone that contained numerous small iron mines and exploration trenches. ![]() The idea was to mine relatively low grade iron ore, cheaply from surface open pits, concentrate the magnetite and form it into briquette heavy enough to be blast furnace feed. ![]() Edison invested approximately $2 million of his own funds and another million of investor money. The Edison Mine was developed in the 1890’s by Thomas Edison. This mine incorporated several of the earlier Ogden group mines. Here he applied his inventions to concentrate magnetite into briquette but almost went bankrupt when the Mesabee Range deposits were discovered in the mid-west. Edison was a respected inventor of mining technology, including beneficiation machines. This mine was owned by the New Jersey and Pennsylvania Concentrating Co., an enterprise of Thomas Alva Edison. A former Fe mine in magnetite ore located 2 to 3 miles SE of Ogdensburg in Sparta Township. ![]()
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