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2024 Open  Memorial Day through Labor Day
Saturday only 11 to 4.  Sunday by appointment   Call 530-287-3330 or email 

Photo by Chris Adamson

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Incorporated in 1995 UGMM is an educational non-profit organization. All donations are tax-deductible to the full extent of the law. California Corporation # C1928743

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exists to discover and tell the stories of this unique place.

The underground story is both human and geological. The human story revolves around the miners and is connected to all aspects of their lives. The geological story began in an era when the core of the earth "bled" mineral wealth into the fault zones of California. Both aspects of the story are golden.

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  • Comstock Gold Prospectors

  • The Davis Family Foundation

  • Drew Family 1994 Revocable Trust Steve and Gerri Drew

  • Carl "Bud" Munck

  • Wayne Kirk & Bev Parker

  • Morning Glory Gold Mines

  • Nevada County Gem & Mineral Society


  • Lee Adams

  • Linda K. Bennett

  • Bill and Michele Brasier

  • Fiedler Construction In memory of Herman Fiedler

  • Donna Giles

  • Stan & Delight Hart

  • JNE Ranches

  • Janet Matlock

  • Nevada County Historical Society

  • Bob Nordhausen

  • Christopher T Smith

  • Doug Stevens

  • Emerald Cove Marina, Inc.

  • Dick Tieben In memory of Don Bell

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