(Nevada City, CA) — Authorities are searching for 24-year-old Esmeralda Marie Pineda, who disappeared Monday while at a mining claim camp near the Yuba River and Sweetland Creek in Nevada City.

Pineda, who is considered at risk due to her personal history and the treacherous terrain, was last seen wearing a black sweatshirt, floral leggings, and a black Swiss backpack.

Search and rescue teams have been combing the remote area since Monday night, utilizing ropes and specialized equipment to navigate the difficult landscape.