Emmett

Emmett is the seat of Gem County, Idaho, on the Payette River northwest of Boise. Despite the county's name, Gem County wasn't named for gemstones — Wikipedia traces it to early-1900s fruit packers branding the valley the "Gem of Plenty" — but the area does hold real, documented opal and agate deposits. Mindat records fire opal specifically from Squaw Butte, a real 5,906-foot peak at the north end of the valley, and multiple sources describe light-blue agate found in the same general area. The DB coordinate here lands on the town of Emmett itself, not Squaw Butte — treat Emmett as the access town for a broader collecting area to the north, not the specimen source itself. Land status at Squaw Butte is genuinely unclear; some sources reference patented and unpatented mining claims on similar Idaho opal deposits, so confirm before you dig.

Emmett sits on the Payette River on Highway 16/52, about 30 miles northwest of Boise. Squaw Butte itself is north of town at the head of the valley; exact driving directions and mileage are unverified — one secondary source put it as far as 50 miles north, which could not be independently confirmed and may be inflated or confused with a different site.

UNVERIFIED at the specific-site level. General inference for this kind of Miocene lava-bed opal/agate deposit: surface float collecting supplemented by hard-rock work where veins are exposed, typical of Idaho fire opal localities elsewhere in the state.

Idaho Department of Lands states that all state endowment trust lands are open to casual exploration for gemstones and mineral specimens, provided the specific parcel isn't under an active exploration lease — check with the nearest IDL Supervisory Area office for current status. Separately, some Idaho opal deposits similar to Squaw Butte are documented as partly covered by patented or unpatented mining claims, which would restrict or bar casual collecting on those parcels specifically. Land status at Squaw Butte itself is UNVERIFIED — confirm before visiting.