KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY KAJ R. SVENSSON / SCIENCE PHOTO LIBRARY
Gold ore. A mining drill sample with a high concentration of gold ore. This soft, heavy, acid- resistant metal is usually found in quartz veins, as a natural alloy with silver, and in concentrations of sedimentary origin. The main gold- bearing districts are Witwatersrand (South Africa), the Mother Lode (California, USA), the Yukon (Alaska, USA), Porcupine (Northwest Territory, Canada) and the USSR. It is used as a monetary standard, in jewellery, in dentistry and for scientific and electronic instruments.
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