Dec. 27 (Bloomberg) -- Workers at Codelco's Chuquicamata copper mine rejected the company's latest wage offer in a meeting today and may vote to go on strike next month after a vote tomorrow, a union official said.

A group of workers want union representatives to seek higher wages and bonuses in negotiations with the company, union official Jaime Graz said in a telephone interview today.

The state-owned company, the world's largest copper producer, is offering a 3.8 percent wage increase and benefits worth 14.5 million pesos ($28,634) to sign a new 3-year wage deal.

Codelco extended the terms of an early signing bonus beyond a Dec. 23 deadline after workers rejected an offer on Dec. 22. The Chuquicamata workers' current contract expires on Dec. 31.

The Chuquicamata mine is the world's second-largest after BHP Billiton Ltd.'s Escondida, which is also located in Chile's Atacama Desert.