Copper ended with a near 1 percent gain on Tuesday, tracking gains in the broader financial market, as investors grew more optimistic that Greece will avoid a debt default. Risk sentiment improved and the euro rose for a fourth straight session, helping push the Reuters-Jefferies CRB index up about 0.5 percent by midday in New York.
The index, a global benchmark for commodities, had ended down in five of the last eight sessions, losing a cumulative 4 percent. In New York, the key September COMEX contract settled up 1.45 cents at $4.1070 per lb, after dealing between $4.0775 to $4.1465.