Montana Sapphire Mining: Where to Dig and Wash for Sapphires

Montana is the only major sapphire source in the United States. Sapphires wash out of old river gravels in four main areas: Rock Creek near Philipsburg, the Missouri River near Helena, Dry Cottonwood Creek, and Yogo Gulch, whose famous cornflower-blue stones come from a private mine closed to the public. Visitors buy bags or buckets of sapphire gravel and wash and screen it themselves.

Montana sapphire mining at a glance

Best places	Philipsburg (Rock Creek gravel) and the Missouri River near Helena
How it works	Buy a bag or bucket of gravel and wash and screen it yourself
Open in winter	Philipsburg shops year-round; Spokane Bar by appointment
Time needed	Two hours or more per bag
What you will find	Small stones, mostly under a carat, in blue-green, pale blue, yellow and pink
Not open	Yogo Gulch, a private mine

Philipsburg (Rock Creek gravel)

• The Sapphire Gallery: an indoor mining room open year-round, closed Saturdays.
• Montana Gems of Philipsburg: gravel washing all year.
• Gem Mountain: a summer-only mine in the Sapphire Mountains, plus a downtown shop that sells gravel year-round.

Missouri River near Helena

Spokane Bar Sapphire Mine is open daily from April to October and by appointment in winter. Montana Blue Jewel Mine on the Eldorado Bar runs from mid-April until the first hard freeze. Missouri River stones are mostly pale blue, green and pastel colors.

What to expect

• Most finds are small, typically under a carat, in blue-green, yellow, pink and pale blue.
• Many shops will heat-treat good stones to improve color and can facet them for jewelry.
• Plan two hours or more to wash a bag carefully.

Other Montana gems

Garnets wash out along Alder Gulch near Virginia City and at Ruby Reservoir, and Yellowstone River agates are found on gravel bars below Billings.

Questions

Where can you dig for sapphires in Montana in winter?

In Philipsburg, where the Sapphire Gallery and Montana Gems of Philipsburg offer gravel washing year-round, and at Spokane Bar near Helena by appointment.

Can you find Yogo sapphires?

Not as a visitor. The Yogo Gulch deposit is on private land and is not open for public digging.

What do Montana sapphires look like when found?

Small rounded crystals, most under a carat, in blue-green, pale blue, yellow and pink, often with a frosted surface.

Back to the Montana rockhounding guide · Rules by land type