Little Joe Mine

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The Little Joe and Hoss Opal Mines are located in the Calico Hills and discovered by Ray Duffield in the 1960's[1]. The Royal Rainbow Opal Mine is located a few km to the north.

In the 1970's the mine was owned by Ray and Marge Duffield, who charged diggers $5 per day with the condition that they would sell a larger find to them for $600 maximum.[2]


  1. Stephen B. Castor, Gregory C. Ferdock, "Minerals of Nevada," Issue 31, p. 76, 2004.
  2. Gary Pedersen, "Remote Mine Home Draws Diggers: Opals Lace 'End of the Earth',", Los Angeles Times, January 3, 1978 pg oc3.

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