London copper firmed on Tuesday, holding near the more-than-one-week high hit in the previous session, aided by recent US tariff exemptions and optimism that top consumer China will launch additional stimulus measures to bolster economic growth.
The benchmark three-month copper on the London Metal Exchange (LME) was up 0.1 percent at $9,192.5 a metric ton, as of 0252 GMT. In the previous session, the contract hit its highest level since April 4.
The most-traded copper contract on the Shanghai Futures Exchange (SHFE) rose 0.3 percent to 76,050 yuan ($10,402.42) per ton.
US excluded smartphones and other electronics from its tariffs on China over the weekend, and after US President Donald Trump added new wrinkles to his vacillating trade policy on Monday by suggesting he might grant exemptions on auto-related levies already in place.
