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Brazil. Gold Washing. Foliated Gold with QuartzEngraving of rock quartz with fern like striations of gold running through it
Gold mining at JohannesburgAn aerial photograph of gold mines in Johannesburg. The photograph was taken by Captain Spelterini on one of his balloon ascents
America. Photographs of California. Gold washing on the YubaWater was indispensible in the gold mining process and the water from the River Yuba was dammed and piped to wash away the sand and quartz from the gold particles
A City on MercuryThe inhabitants of Mercury are insectoid, and their techno- -logy is a superior form of that used by ants and bees on Earth : quartz crystals are used to build their cities