North Idaho (Emerald Creek, Coeur d'Alene district)
The Emerald Creek Garnet Area near Clarkia is a USFS permit dig for Idaho star garnet. The Silver Valley also has mine dump material, subject to access and claim status.
Rockhounding in Idaho
114 mapped spots across 33 counties. Idaho is known for star garnet, opal, jasper, and agate. Emerald Creek, Spencer Opal Mines, Bruneau Canyon, and the Owyhee jasper fields are the main names to know.
Idaho rockhounding photos
Representative spot and material photos from locations in this state, shown where verified public image records are available.
Map showing 114 rockhounding spots in Idaho
Top minerals found in Idaho
Counts reflect how many spots in this list mention each mineral.
- Gold23
- Agate12
- Quartz10
- Garnet8
- Petrified Wood7
- Chalcedony6
- Jasper6
- Opal6
- Galena5
- Opalized Wood5
- Amethyst4
- Corundum4
Notable areas: Emerald Creek star garnet, Spencer opal, Bruneau jasper, and Graveyard Point plume agate are common Idaho targets.
Geology behind Idaho rockhounding
Idaho's collecting splits into three big stories: the Idaho Batholith and its garnet-bearing schists in the north (Emerald Creek); the Snake River Plain volcanics and their picture jaspers (Bruneau Canyon, Graveyard Point); and the Spencer rhyolite dome in the east, which produces the only common opal in North America with a strong play of color.
Best regions to focus your search
Snake River Plain (Bruneau, Owyhee)
Bruneau jasper, Graveyard Point plume agate, and McDermitt opal across the Idaho/Oregon line. Most ground is BLM with long approach drives.
Eastern Idaho (Spencer, Bear Lake)
Spencer opal at fee-dig mines — the only common opal mine in the U.S. that produces play-of-color material. Closed in winter.
Best season
Emerald Creek: open Memorial Day through Labor Day under USFS permit hours. Spencer opal: open seasonally Memorial Day through early September. South Idaho jasper country: April–October.
What to bring
Emerald Creek: USFS supplies tools and a screen; bring rain gear and waterproof boots. Spencer: bring a screen, a hammer, and patience. Bruneau Canyon: 4WD high-clearance and full-size spare; the canyon is remote.
Local collecting history
The star garnet was named Idaho's state gem in 1967. Spencer opal was discovered in the early 1960s when two deer hunters spotted opalized rhyolite on a hillside near the Montana border — the deposit has been a fee dig ever since.
Rockhounding near major Idaho cities
Day-trip range. Each section lists the closest mapped rockhounding spots within about 150 miles of the city — most are inside a 2 to 3 hour drive.
Rockhounding near Boise
See all →6 closest spots to Boise, ID.
- Shafer CreekBoise County · Feldspar15 mi19 min drive
- Ada CountyAda County · Agate, Chalcedony16 mi20 min drive
- EmmettGem County · Blue Agate, Opal24 mi30 min drive
- Idaho CityBoise County · Quartz, Garnet24 mi30 min drive
- SweetGem County · Agate29 mi37 min drive
- Garden ValleyBoise County · Aquamarine35 mi44 min drive
Neighboring states with rockhounding
Geology rarely respects state borders. These states share mapped rockhounding country with Idaho — useful when Idaho is the start, not the whole trip. Each card links to the closest county across the line.
Rockhounding by county in Idaho
County pages are linked once we have at least 3 mapped spots for a focused guide with coordinates, mineral notes, and nearby spots.
- Idaho County10 spotsTop: Gold, Corundum, Quartz
- Custer County9 spotsTop: Gold, Agate, Azurite
- Owyhee County9 spotsTop: Agate, Petrified Wood, Bruneau Canyon Jasper
- Shoshone County9 spotsTop: Gold, Garnet, Staurolite
- Adams County7 spotsTop: Epidote, Malachite, Rhodonite
- Blaine County7 spotsTop: Galena, Jasper, Sphalerite
- Lemhi County6 spotsTop: Gold, Agate, Banded Agate
- Bonner County5 spotsTop: Feldspar, Quartz, Galena
- Clearwater County5 spotsTop: Gold, Almandine Garnet, Epidote
- Latah County5 spotsTop: Biotite, Garnet, Green Beryl
- Valley County5 spotsTop: Agate, Arsenopyrite, Blue Topaz
- Boise County4 spotsTop: Aquamarine, Feldspar, Garnet
- Nez Perce County3 spotsTop: Agate, Aquamarine, Chert
- Washington County3 spotsTop: Amethyst, Banded Agate, Chalcedony
- Elmore County2 spotsTop: Gold, Smoky Quartz, Topaz
Top picks in Idaho
10 best spotsHand-picked standouts from the Idaho list, chosen for unusual mineralogy, documented public access, or both. Each card links to coordinates, access notes, and what to look for.
Top pickEmerald Creek
PublicShoshone County
Emerald Creek is Idaho's signature public star-garnet locality, with the Forest Service noting that commercial quantities of star garnet are otherwise known only from India. The managed sluice area gives collectors a rare legal way to search for dodecahedral almandine garnets while keeping digging out of the streambed.
Almandine Garnet
Top pickIdaho City
PublicBoise County
Idaho City anchors the Boise Basin, one of Idaho's best-documented historic placer-gold regions. USGS publications identify the basin northeast of Boise as a major dredging and placer area, and nearby Grimes Pass district records add quartz and gold mineral context for modern, land-status-aware panning and prospecting.
Quartz, Garnet
Top pickBruneau Canyon
PublicOwyhee County
Bruneau Canyon stands out for Bruneau jasper, the orbicular and scenic jasper variety tied to the Bruneau River canyon in Owyhee County. Idaho Department of Lands lists Bruneau jasper about 50 road miles south of Bruneau, and Mindat treats the canyon deposits as a named locality, making it one of the state's most recognizable lapidary sources.
Bruneau Canyon Jasper
Top pickSeven Devils Mining District
PublicAdams County
Seven Devils is a classic Idaho skarn and copper district, where Idaho Geological Survey maps and reports emphasize limestone-garnet belts, copper deposits, and lime-silicate minerals. For collectors, that translates into a broader mineral suite than most Idaho sites: garnet, epidote, malachite, zoisite, and related contact-metamorphic material.
Epidote, Red Garnet, Pink Garnet, Malachite
Top pickChallis
PublicCuster County
Challis represents the Challis Volcanics better than a single protected petrified-forest stop, with Idaho Department of Lands listing nearby red agate, banded opal, and petrified-wood localities in Custer County. Mindat records opal from the Challis area and documents agate collecting in the same volcanic province, which makes it a practical tenth pick for silica collectors.
Red Agate, Banded Opal
Top pickDismal Swamp
PublicElmore County
Dismal Swamp is a focused Elmore County locality for smoky quartz and topaz, both listed for the area by Idaho Department of Lands and Mindat. It is a more mineral-specimen-oriented choice than many Idaho agate fields, with quartz-family collecting tied to the Rocky Bar mining district and nearby granitic terrain.
Smoky Quartz, Topaz
Top pickSuccor Creek
PublicOwyhee County
Succor Creek is one of the clearest public names in Owyhee agate collecting, especially for red-and-green nodules and thunderegg-style cavities. Idaho Department of Lands calls out the eastern fringe of Succor Creek specifically, and the broader Owyhee volcanic field gives the site the silica-rich source rocks behind its agate and jasper float.
Red Agate, Green Agate
Top pickMackay
PublicCuster County
Mackay is the best Custer County mine-district pick for copper minerals, with Mindat documenting malachite and related species across the Alder Creek and White Knob district. Idaho Department of Lands also lists Custer County districts for azurite, malachite, and other base-metal minerals, so the site has stronger mineral documentation than a generic scenic stop.
Azurite, Chalcopyrite, Chrysocolla, Malachite
Top pickLittle Wood River
PublicBlaine County
Little Wood River is the strongest Blaine County pick because the same drainage is listed for green and moss agate by Idaho Department of Lands and has Mindat specimen records from the Little Wood Reservoir area. Its agate, chalcedony, and jasper add a useful south-central Idaho counterpoint to the better-known Owyhee localities.
Agate, Chalcedony, Jasper
Top pickParker Mountain
PublicLemhi County
Parker Mountain gives Lemhi County a documented agate and chalcedony locality outside the crowded southern Idaho fields. Idaho Department of Lands lists green and green-moss agate near Parker Mountain, while Mindat records agate and chalcedony within the Parker Mountain mining district mineral list.
Agate, Chalcedony
Every rockhounding spot in Idaho
Sorted by county. Tap coordinates to open in Google Maps, or open RockHoundR for the full map view with land overlays and weather.
Idaho rockhounding FAQ
Is rockhounding legal in Idaho?+
Yes on BLM and USFS land under the BLM 25 lb/day, 250 lb/year rule. Yellowstone NP, Craters of the Moon, Idaho State Parks, and tribal lands are closed. Emerald Creek requires a USFS fee permit.
How does the Emerald Creek star garnet dig work?+
The Emerald Creek Garnet Area is run by the Idaho Panhandle National Forests. Pay a daily permit at the entrance, receive a five-gallon-bucket limit, and dig in a sluice trough provided by USFS staff. You sort wet gravel for star garnets — most are pebble size but some are walnut-size cabochon-grade stones.
Where can I find opal in Idaho?+
Spencer Opal Mines near the Idaho/Montana border is the only producing fee-dig common-opal-with-play-of-color site in the United States. Open seasonally. The surrounding rhyolite hills are mostly patented claims — stick to the mine.
What's the BLM limit in Idaho?+
Up to 25 pounds per day plus one piece, with a 250-pound annual cap per person, applied to common rocks, mineral specimens, and semiprecious gemstones. The cap is separate from petrified wood, which has its own 25 lb/day, 250 lb/year limit.
What rocks and minerals can you find in Idaho?+
Common targets include star garnet (Emerald Creek), Spencer opal, Bruneau jasper, Graveyard Point plume agate, McDermitt opal, agate float across BLM Owyhee country, and mine-dump minerals in the Silver Valley.
Map every Idaho spot in the app
Open the RockHoundR app to see Idaho on a real map with public land overlays, weather, geology, and your saved finds.
