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Geology



Discover the incredible geology of California's caves beneath the Sierra Nevada. Learn how these meandering chambers are created, and how the beautiful decorations form over aeons. On our mine tours, discover Californa's Mother Lode, the quartz vein structure that still bears tons of gold and inspired a whole generation to abandon their lives for a chance at wealth.

History



Discover the history of California's caves and their place in their communities. Learn of their fascinating discoveries by interesting characters who strove to open them to the public. Discover the rich history of the California Gold Rush on our gold mine tours. Learn how gold is extracted from the ore, and how mining has improved technology and the life of gold miners over the centuries.