


Natural resources - The World Factbook - Central Intelligence Agency - kolkata industrial copper mining equipment
FMIB 49777 Ear ornaments Their weight stretches the ear They are of copper and tin, inlaid with silver and gold, and were hung to the ear.jpeg 798 × 657; 95 KB FMIB 49778 Bone wedding ring, made as though the bride and groom both wore it during the ceremony.jpeg 807 × 421; 73 KBIn addition, cupellation, developed in the 8th century, was more often used for the refinement of lead-silver ores, to separate the silver from the lead (Bayley 2008). Parallel production with more than one technical method, and different treatment of ores would occur wherever multiple ores were present at one site. (Rehren et al. 1999).
