Experience History Under the Stars!

Join us for a moonlit adventure to the legendary Calcite Mine, nestled in the stunning Santa Rosa Mountains!

This unforgettable journey is guided by a certified Wilderness First Responder, ensuring a safe and memorable experience. Don’t miss your chance to explore this hidden piece of history—spaces are limited, so sign up now!

Who Should Attend

• History enthusiasts curious about local WWII sites

• Hikers seeking a unique night adventure under the stars

• Nature lovers interested in desert landscapes and geology

• Anyone eager to explore lesser-known desert history with expert guidance

What to Expect

• A moderate 4-mile roundtrip night hike on a dirt road (we will not enter the slot canyon)

• 685 feet of elevation gain with steady climbing & unique sandstone formations

• Stunning views of desert badlands, the Salton Sea, and starry skies

• Fascinating stories about WWII history and how this was the only calcite mine ever operated in the U.S. — activated as part of a top-secret wartime effort after Pearl Harbor.

• Cooler evening desert temperatures—bring layers

Date: Saturday, August 9, 2025

Time: 7:30 p.m.-11:00 p.m.

Location: ABF store in The Mall in Borrego Springs (587 Palm Canyon Dr. #110, Borrego Springs, CA 92004)

Please bring: 

• 2 liters of water  

• Layers 

• A headlamp  

• Hiking shoes  

• Snacks  

Cost: 

ABF Member: $20

Non-Member: $30 (Or join as an ABF Member today for just $35 and attend this hike for free!)

Student: $15

Cancellation requests must be received at least seven days before the event if you wish to receive a credit or refund.  View our FAQ for more information.

REGISTER HERE

Hike Leader: Matt McArdle has a B.S.in biology from UC San Diego and loves natural history, science, and exploring the outdoors. He first visited Anza-Borrego Desert State Park in 2009 and has since spent many weekends exploring the Park’s trails. In his professional life, he’s worked as a science writer, a science educator, and in marketing communications for various technology-focused companies, including medical devices, irrigation management, and laboratory equipment. Matt is certified as both a California Naturalist and Wilderness First Responder.