A Canadian woman was rescued over the weekend after she got lost in the Colorado mountains for four days as part of a guided spiritual “quest,” according to a local sheriff’s department, which said that participants had been encouraged to fast and discouraged from bringing cellphones.

The woman, Gina Chase, 53, of Victoria, British Columbia, was camping near the San Miguel Mountains of Colorado with 10 others through the Animas Valley Institute, an organization based in Durango, Colo., that emphasizes the spiritual value of being alone in nature, the San Miguel County Sheriff’s Office said in a Facebook post. Around 11 a.m. on Aug. 14, Ms. Chase embarked on a “solo journey” near Lone Cone Peak but was reported missing around 2 p.m. the next day after she did not return to camp, the sheriff’s office said.

On Sunday morning, after a multiday search that included K9 teams, aircraft and drones, Ms. Chase was found “alive and uninjured,” officials said. The sheriff’s office had initially said that she was found on Saturday.

“Ms. Chase was part of a group of campers who, by design, set off alone into the backcountry without their cellphones and then fasting ‘to maximize their experience with nature,’” the authorities said in their post.

“You should always bring technology for communications,” Sheriff Bill Masters said in his office’s Facebook post. “Furthermore you should not starve yourself even if a ‘guide’ service suggests the opposite of these basic safety rules.”

Ms. Chase, who declined to be interviewed on Tuesday, reached out on Wednesday evening to comment about her ordeal.

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