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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Svensson, Kaj R. |
Taille de l’image : | 3590 px × 2480 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |