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Open Ground · Open ground

Gem Mountain Sapphire Mine

Fee dig · Rock Creek gravels, Hwy 38, near Philipsburg, MT
ACCESSIBLE
Evidence status: Historical tradition. no documented source (historical tradition); legal status unknown (manual verification recommended). This account is presented as historical tradition, not verified fact. Manual verification recommended. Repository evidence: 0 sources · 0 timeline events · 0 media items · legal unknown · view on the Map Evidence on file: historical tradition

Gem Mountain Sapphire Mine: still unexplained.

Montana sapphires in every color but red

The law of this ground: Private fee operation, gravel by the bucket; every stone you pull is yours.
The subject
developing the photograph…
The manifest
Montana sapphires in every color but red
The account

The oldest and largest public sapphire ground in America. You buy gravel by the bucket, wash it at the trough, and tweezer out the rough, blues, greens, the odd orange that heat-treats to fire. Millions of carats have come off Rock Creek since the 1890s, and the gravel has not run out. Neither have the people bent over the trough.

Leads, where the trail points now
  • What you can keep: Montana sapphires in every color but red. Confirm the site's current rules and any day fee before you go.
  • Where: Hwy 38, near Philipsburg, MT. Private fee operation, gravel by the bucket; every stone you pull is yours.
  • Best practice: record anything notable, leave the ground as you found it, and check the latest access notices before you travel.
What the record holds

What remains open

  • No period map of the site has surfaced.
  • No contemporary press coverage has been found.
What we know, and what we don't
Established

No documentary claim is yet established. The account rests on tradition.

Still open
  • No period map of the site has surfaced.
  • No contemporary press coverage has been found.
The evidence room

No documentary or visual exhibits have been located yet. The trail below and the open leads are where this dossier grows next — every exhibit that enters here carries a source.

Where the trail points now
  • What you can keep: Montana sapphires in every color but red. Confirm the site's current rules and any day fee before you go.
  • Where: Hwy 38, near Philipsburg, MT. Private fee operation, gravel by the bucket; every stone you pull is yours.
  • Best practice: record anything notable, leave the ground as you found it, and check the latest access notices before you travel.
  • Search Library of Congress + DPLA (IIIF) for period cartography of the site.
  • Run Chronicling America for dated newspaper mentions.
  • Query NARA for archival records tied to the site.

Have a source, a map, or a clipping? Add a lead and it enters the record with its citation.

Start the hunt here
The first leads, so no one walks in cold.
Sources and the record
Related case files

The full hunt kit

Starting brief, what's known and disputed, evidence timeline, source list, map card, coordinate-confidence and legal-access summaries, and a field checklist, free with a Fellowship account.

Latest Word From the Newswire

Context, not proof. The dossier's own sources remain the evidence record.

Checking the wire…

Chart position 46.210°, -113.510° (approx.) View on the Map