[4] An aerial geophysical survey, conducted by Texas Gulf Sulphur Company in March 1959, indicated an anomaly in the Kidd-55 segment warranting ground investigation.

The copper-zinc-silver ore deposit at Kidd Mine discovery was announced in a press release after the board of directors meeting on 16 April 1964.

[5][6] During the initial exploration of the site, then known as Kidd-55, officers of the company engaged in insider trading in Texas Gulf shares.

[7] The ensuing lawsuit by the Securities and Exchange Commission resulted in a landmark decision that established the right of all market participants to have "relatively equal access to material information.

[11] Kidd Mine and Met Site collectively employ approximately 850 employees and contractors.

In 2008, the company committed to investing $120 million to extend the production to 2017, and deepen the mine to 9,600 feet (2,900 m).