From 1951 to 1978 the Marmora iron ore pit was owned and operated by the Marmoraton Mine Corporation. Its mother company, however, was Bethlehem Steel Corporation in Bethlehem Pennsylvania, where the company operated a massive furnace and mill.
Bethlehem Steel was once America's second-largest steelmaker, providing ships and armaments to the US military during World War II and helping to build the Empire State Building and Golden Gate Bridge. By 1972, the company was at its peak, employing 120,000 people, and building its new headquarters, the Martin Tower - a 21 storey high rise that stood as the tallest building in Bethlehem.
However, in 2001, the company went bankrupt, leaving the tower vacant and while attempts were made to find new uses for the tower, it was found to be uneconomical. On May 19, 2019, the Martin Tower was imploded.