Gold

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Gold was a rare mineral on Earth. Most Human economies were based on this metal until the mid-twentieth century. The gold rush of 1848 caused a massive influx of people to San Francisco and northern California. (New Worlds, New Civilizations short story: "At Times of Peril")

Prior to United Federation of Planets contact, gold and silver had no meaning on Capella IV. Starfleet trade ships introduced these materials as currency prior to 2267. (TOS novelization: Friday's Child)

Types of currency
materials	acta crystal • gold • latinum • silver
units	credit • darsek • dirak • dollar • drokna • ducat • ilec • kern • klon peag • lek • lita • notch-rock • tri-esta