Where: Montana · North America · approx. 46.63, -111.73 (vicinity only)
Why this spot: Rockhounding locality: Missouri River terrace gravels with placer sapphire
What turns up: sapphire (pastel colors), garnet
Access: Permission required.
Commercial fee-dig (Spokane Bar Sapphire Mine); buy or dig gravel for a fee, not free open collecting.
Open in Mudlark Map →
Satellite view, historic-map overlays, tide/flow context and field notes are in the app. Exact research detail is part of Pro.
Pins are approximate by design. This page is historical research, not permission to dig. Check ownership and local law first.