The Keystone mine (No. 22, pl. 30a), part of the Goodsprings or Yellow Pine Mining District, was established in 1882 by Joseph Yount. No work was done before 1888, when it was relocated, with the adjoining Honduras claim, by Jonas Taylor. In 1892, after a little work had been done, rich ore was struck , and a shipment of 10 tons yielded $7,160. In June 1892, S.T. Godbe of Salt lake City, purchased an interest for $20,000, and active exploration was begun. The Keystone Mine produced gold as a by product of lead-silver-zinc mining, with a total production estimated at around $380,000.. In 1892 it was the most profitable of the mines in the Yellow Pine District. In 1893, a post office was established at the Keystone Mine and the area supported about 200 people, a few stores, and numerous small mines dotting the landscape.

In 1895 the Keystone Mine was taken over by the miners in a dispute over wages. The miners held the mine for three months until enough money had been made to pay both their wages, as well as the wages for local Indians who had been cutting wood for the mine.

In 1897, the post office at the Keystone Mine closed., about the same time a post office was opened in Goodsprings.

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