JAKARTA, Indonesia — Gunmen fired at a helicopter carrying workers for the mining giant Freeport-McMoRan shortly after it took off Saturday from a town near the company’s huge gold and copper mine in eastern Indonesia, a police spokesman, Colonel Wachyono, said.

One person, the wife of a Freeport employee, was injured by shrapnel, the police said, and the helicopter was able to land safely in a town 55 miles away.

A motive for the attack was not known, the police said, and the gunmen remained unidentified.

Colonel Wachyono said six shots were fired at the helicopter, which carried 29 workers and family members, with one shot penetrating a window and the rest striking the rotors.

Freeport, which is based in Phoenix, has been struggling to deal with a prolonged strike by some workers and sabotage, which have crippled production at its Grasberg mine in eastern Indonesia.