BOGOTA (Reuters) - Zijin Mining has paused production at its Buritica gold mine in Colombia after assailants armed with homemade bombs damaged a key power source, the company said on Saturday.
Figure 1. Pleochroism in a 15 ct tanzanite, as seen with the unaided eye through the crown and the pavilion sides and ends. Photo by Wimon Manorotkul. In describing colored gemstones, the major ...