A Colorado hiker was found alive four days after she disappeared in the wilderness during a “spiritual” retreat with a group of campers who did not have cell phones, authorities said.

Gina Chase, 53, of Victoria, Canada, was found unharmed in the search area near Lone Cone, Colorado, on Saturday, the San Miguel County Sheriff’s Office said.

Chase was part of a group that intentionally went into the wilderness without cell phones and was encouraged to fast on their so-called “quests” to “maximize a spiritual experience with nature,” the sheriff’s office said. The program is run by the Animas Valley Institute in Durango.

Chase was last seen around 11 a.m. Wednesday when she left her group to go on a “solo trip,” the sheriff’s office said.

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Gina Chase, 53, was found alive four days after she disappeared during a “spiritual” retreat in Colorado last week, the sheriff’s office said. (San Miguel County Sheriff’s Office)

Chase was reported missing to camp leaders on Thursday after her “buddy” returned to the main camp and found Chase had not reported in, officials said. Camp leaders conducted their own search for several hours but were unable to find any sign of Chase.

Chase was last seen near Lone Cone, Colorado. Officials described the terrain as difficult, with dense undergrowth and trees. (San Miguel County Sheriff’s Office)

At around 2 p.m., the guides called the sheriff’s office, which immediately launched a search and rescue mission for Chase. Dozens of police officers and volunteers searched the difficult terrain of dense undergrowth and trees over the next four days before finding Chase unharmed.

Dozens of helpers were involved in the four-day search. (San Miguel County Sheriff’s Office)

“This is obviously the outcome we were all hoping for and we couldn’t be happier for Ms. Chase and her family,” said San Miguel County Sheriff Bill Masters. “The ultimate success of this mission is a true testament to the tenacity, perseverance and dedication of our responders.”

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Masters also warned the public against going into the wilderness alone without proper equipment and sharply criticized retreat leaders for encouraging wilderness fasting.

“You should always have communication technology with you,” Masters said. “Also, even if a ‘guidebook’ recommends the opposite of these basic safety rules, you should not go hungry. Nature does not care about your safety and will kill you, especially if you are not properly prepared.”

Retreat leaders called the sheriff’s office at 2 p.m. Thursday after conducting their own search for several hours without success, authorities said. (San Miguel County Sheriff’s Office)

The Animas Valley Institute’s website states that since its founding in 1980, it has offered a “nature-based journey of soul initiation” that includes what it calls “soul art intensives” and “contemporary vision fasts.”

After Chase was found safe and sound, the institute released a statement thanking the sheriff’s office and saying that safety was its top priority.

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“The Animas Valley Institute has been conducting backcountry programs in Colorado since 1980 without any serious incidents,” the statement said. “The safety of our participants remains our highest priority.”