Hundreds of female employees and wives of workers at cement producer PT Holcim in Cilacap, Central Java, planted trees in the company’s former mining area in Tritih Lor village in Cilacap regency Thursday.

The event was part of the company’s Women Plant Trees project to support the National Tree-Planting Day movement, Holcim said in a press statement.

Holcim stated that the company had planted at least 166,000 trees, including on Nusakambangan Island off Cilacap.

Holcim has been criticized by many groups, including the Natural Resources Conservation Center in Nusakambangan, for not taking enough action to conserve the 53-hectare former mining area.