Claim: Groom Mine was valued by the United States Bureau of Mines as having a $3.75 million worth of mine products and was the most productive mine in the Groom Mining District.
Evidence: Until 1956, the mine product totaled almost a million dollars in several minerals, including copper, silver, and gold; In 1977, the United States Bureau of Mines valued the output of Groom mine products at $3.75 million. It was the most productive mine in the Groom Mining District and had been worked on by three generations of the Sheahan family.