Antofagasta PLC (LSE:ANTO), Fresnillo PLC (LSE:FRES) and Metlen Energy & Metals PLC (LSE:MTLN) were among the strongest risers in the FTSE 100 on Tuesday morning, carried higher by a surge in copper and gold prices driven by tightening supply and robust demand. Antofagasta, the Chile-focused copper miner, rose 123p to 4,261p, a gain of 2.97%, while Fresnillo, the Mexico-based precious metals producer, added 93p to 3,339.50p, up 2.87%, and Metlen Energy & Metals, the Athens and London-listed energy and metals group, gained 1.24p to 41.73p, up 3.06%.