Less successful were Edison's forays into the ore-milling business. Edison first became interested in ore-milling in 1880. In the course of developing his electric light system, he invented and patented a magnetic separator for iron ore. His hope was to develop a competitor to ore mines for the east coast market. He set up plants as early as the summer of 1881 but did not devote himself fully to the project until January 1889.Unable to attract investors to the project, Edison financed his own mines. The most promising site was at Ogden on the border of New Jersey and Pennsylvania. Edison moved there for five years to work on the project and sunk some $3 million into it. It was a massive undertaking, dependent upon a complicated system of ore-separation. It also
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