The Iron was acutally found by mistake, during reconstruction of the Rinca Government building. Human Builders' were building a third basement level in the building, they went to dig down but they were suprised with what they hit.
The builders watched as the white pearlish ore glowed at them, the government administrator was called, and she called upon all miners of Rinca to dig out the Iron. Therefore the dig beacme "The Great Iron Dig". It was called "The Great Dig" only becuase it took almost 15 years to collect every peice.