Copper prices rose on Thursday on healthy US economic data and supply worries stoked by a declaration of force majeure at the world's biggest copper mine, but uncertainty over the US debt crisis capped gains. In New York, the key September COMEX contract advanced by 2.30 cents to finish at $4.4695 per lb. Similarly, it firmed slightly, to $4.4730 per lb in late dealings.
The metal, used in power and construction, hit a session high of $9,851 a tonne after data showed pending sales of existing US homes unexpectedly rose in June. Aluminium ended at $2,638 from $2,644 a tonne. Tin ended at $28,500 a tonne from $28,745, while zinc used in galvanising steel ended at $2,519 from $2,521 a tonne. Battery material lead finished at $2,655 from $2,690 a tonne. Nickel, which hit its highest since mid-May at $24,690 a tonne, was untraded at the close, but bid at $24,550 from $24,395 a tonne.
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