June 29 (Reuters) - Copper gained on Monday after Iran and the United States agreed to halt tit-for-tat attacks and return to diplomacy.

The most-active copper contract on the Shanghai Futures Exchange SCFcv1 gained 1.11% to 102,950 yuan ($15,145.50) a metric ton as of 0330 GMT.

Benchmark three-month copper on the London Metal Exchange CMCU3 gained 0.13% to $13,374.50 a ton. It declined as much as 0.67% earlier in the session.

Iran and the United States agreed to halt recent hostilities in the Gulf and renew talks regarding their dispute over the Strait of Hormuz, a U.S. official said on Sunday, raising hopes of saving an interim peace deal.

The Strait of Hormuz is the world’s most important energy shipping route. Any disruption there can lift oil prices, stoke inflation concerns and weigh on broader risk appetite.

The dollar =USD added to the previous three sessions' decline on Monday, providing support for commodities denominated in the greenback by making them more affordable for investors using other currencies.

The currency still holds near a one-year high reached on June 24.

In China, industrial profits grew more slowly in May, although they remained in double-digit territory, official data showed on Saturday.

Profit growth at China’s industrial firms eased to 21.1% in May from a year earlier, compared with a 24.7% rise in April, data from the National Bureau of Statistics showed. For January-May, profits rose 18.8% from the same period last year, compared with an 18.2% increase in the first four months.

Profits in the non-ferrous metal ore mining and processing sector jumped 93.9% in January-May, while downstream manufacturers remained under pressure.

Elsewhere on SHFE, aluminium SAFcv1 gained 0.48%, zinc SZNcv1 climbed 2.01%, lead SPBcv1 dropped 0.43%, nickel SNIcv1 dipped 0.05%, tin SSNcv1 rose 0.97%.

Among other metals on LME, aluminium CMAL3 ticked 0.14% higher, zinc CMZN3 gained 0.71%, lead CMPB3 added 0.13%, nickel CMNi3 rose 0.69%, and tin CMSN3 increased 0.71%.

($1 = 6.7974 Chinese yuan renminbi)