Entry No. 43 — the Butte file — filed under: roadside-oddity
Crystal Park
A 220-acre Forest Service site at 7,800 feet where the decomposed granite is laced with quartz crystals you are allowed to dig out and keep. Crystals turn up clear, cloudy, gray, or rare amethyst purple, from fingernail-sized to several inches. Only hand tools are permitted, and there is a five-day-per-person seasonal digging limit. Because of snowpack the digging area is only open roughly mid-June through mid-October.
The story
Seventy-two million years ago, hydrothermal fluids forced quartz into cooling granite deep inside the Pioneer Mountains. Time rotted that granite into soft, gravelly clay, leaving 220 acres of six-sided quartz crystals sitting 7,800 feet above sea level. Local prospectors worked the ground quietly for decades before the Butte Mineral and Gem Club staked a claim in 1969. Two years later, the club struck a deal with the U.S. Forest Service to bar commercial mining and hand the plot over to public hand-diggers.
An executive order sealed the arrangement in 1993, formalizing the site as a National Forest recreation area with straightforward rules: hand tools only, no tunneling into soil banks, and a five-day seasonal limit per person. Because the decomposed granite breaks apart under a basic trowel, you are digging through rotten rock for clear points, dark smoky quartz, and purple amethyst tinted by trace minerals. You keep what you dig, provided you haul it out with your own muscle.
What it's like
Drive up the Pioneer Mountains Scenic Byway between mid-June and mid-October, past the vault toilets and paved ADA trail, and you'll spot diggers scattered through the pine timber crouched over hand-dug pits. Pay the $5 per person day-use fee at the self-serve board, then haul in a sturdy trowel, heavy garden gloves, and a quarter-inch mesh screen—the Forest Service doesn't supply gear. Skip the churned-up surface tailings near the parking area; work the sticky tan clay three to five feet down, or wait for a rainstorm to wash away topsoil and spot exposed points glinting in the mud.
The move: Bring a trowel and a screen and spend an afternoon sifting the high-mountain gravel for amethyst, keeping what you find.
📍 Before you go Open ~mid-June to mid-October only; $5/person day-use fee; hand tools only; high elevation, long gravel byway.
- 📍 Pioneer Mountains (near Dillon), MT
- 💸 Free
- ⚡ Up for anything
- 🌗 Outdoors
Where: Pioneer Mountains Scenic Byway (FR 73), Beaverhead-Deerlodge National Forest, MT
Hours: Added 2026-06-24 — confirm current hours before you go.
⚠ Seasonal or scheduled — always check before you go.
Pair it with
- Canyon Creek Charcoal Kilns — Just down the scenic byway corridor, follow up your crystal hunt with a walk around 23 beehive-shaped brick kilns built in the 1880s to fuel regional silver smelters.
- Fairmont Hot Springs Resort — After spending hours crouched in granite dirt at 7,800 feet, wash off the high-mountain grime in 100-plus-degree natural mineral soaking pools.
- Bannack State Park — Extend your prospecting trip south toward Dillon to walk the preserved wooden boardwalks of Montana's first territorial capital ghost town.
- Silver Bow Twin Drive-In — Dust off your boots and head back toward Butte to catch a double feature under the open sky at a twin drive-in operating since 1977.
Good to know
How much is the fee and when is Crystal Park open?
Day use costs $5 per person. The area is open roughly mid-June through mid-October, depending on when snowpack clears from the 7,800-foot pass on the Pioneer Mountains Scenic Byway.
What tools are allowed for crystal digging?
Only non-motorized hand tools—such as shovels, trowels, hand picks, classifiers, and screens—are permitted. Tunneling into banks, using explosives, or bringing power equipment is strictly prohibited.
What kind of crystals can you find and keep?
You can dig up clear, cloudy white, gray smoky quartz, and purple amethyst prisms ranging from fingernail size to several inches long. You are allowed to keep whatever you personally extract, up to the five-day seasonal limit per person.
Are there water or tool rentals at the site?
No. The site has vault toilets, three picnic areas with tables and grills, and an accessible overlook, but there is no drinking water, food, or equipment rental on site.
Plan a visit & invite your people →
Further reading: fs.usda.gov · visitmt.com · Tripadvisor · rockngem.com
last checked: 2026-06-24