The El Gallo mine produced 15,243 ounces of gold in the first quarter ended March 31, prior to an armed robbery of concentrate containing 6,350 ounces last month.
The Peruvian government has deployed troops near the Tia Maria copper project, to deal with the deaths of a protester and a policeman over the past week.
The company now expects earnings before interest, tax, depreciation and amortization, which is a more closely watched metric than net income in the steel industry, to be between $6bn and $7bn.