Custer County Gold Claims Map: Yankee Fork Prospecting & Gem Hunting

Custer County encompasses the rugged heart of central Idaho, defined by the towering Sawtooth and White Cloud ranges and the upper Salmon River basin. Renowned for historical placer gold dredging along the Yankee Fork and high-grade silver lodes in Challis and Bayhorse, Custer County attracts gold panners, suction dredgers, and mineral collectors. Public domain lands managed by the Salmon-Challis National Forest and the BLM Challis Field Office offer expansive mountain territory for small-scale prospecting outside established claim lines.

Geologically, Custer County features complex structural faulting, Eocene Challis Volcanics, and intrusive batholith stocks. Hydrothermal fluids penetrated Paleozoic metasediments and volcanic host rocks, creating rich silver-lead-zinc replacement deposits, fluorite veins, and gold quartz lodes. Fluvial erosion and Pleistocene glaciation weathered these hard-rock deposits, concentrating heavy placer gold across expansive alluvial bench gravels along the Yankee Fork, Loon Creek, and the main Salmon River.

For lapidary collectors, Custer County’s mineralized country yields prized gemstone specimens, including star garnets, agates, chalcedony geodes, smoky quartz, and amethyst. Successfully navigating Custer County requires precise boundary verification. Active unpatented placer claims line major river channels, while lode claims cover alpine slopes, intermingling with private patented holdings and wilderness boundaries. Utilizing a live Custer County mining claims map enables prospectors and rockhounds to inspect current BLM MLRS records, confirm open public domain land, and navigate mountain access routes legally and safely.

2,943

Active Custer County, ID Claims

27,535

Historical Custer County, ID Claims

885

Custer County, ID Rockhound Hotspots

31,363

Total Custer County, ID Claims & Hotspots

Custer County, ID BLM mining claims & rockhounding interactive map.

How Do You View Custer County, ID BLM Mining Claims Offline?

Save any map area while you have cell service, then navigate active BLM mining claims, land ownership boundaries, and optional layers like elevation contours, roads, and creeks — with zero connectivity out in the field. Offline downloads are included on every paid plan. See plans below →

Custer County Mining Geology & Yankee Fork History

1870s Yankee Fork & Bayhorse Strikes: Gold prospecting in Custer County kicked off in 1870 with placer discoveries along Loon Creek and Yankee Fork, followed by major silver-lead strikes in the Bayhorse and Challis districts.
Challis Volcanics & Polymetallic Veins: Eocene volcanic eruptive structures and granitic intrusions fractured host rocks, creating hydrothermally deposited gold quartz veins, silver-lead replacement orebodies, and fluorite deposits across the county.
Historic Yankee Fork Bucket-Line Dredging: Heavy placer gold concentrations along the Yankee Fork supported extensive bucket-line dredging from 1940 to 1952, leaving historic dredge tailings and gravel bars that still yield placer gold to modern panners.
Custer County Mineral & Gemstone Variety: Complex contact metamorphic zones and volcanic formations yield diverse lapidary specimens, including garnets, smoky quartz crystals, banded agates, jasper, and secondary copper minerals.
Salmon-Challis Forest & BLM Land Access: Millions of acres of public domain lands administered by the U.S. Forest Service and BLM offer regulated terrain for non-commercial gold panning, sluicing, and rockhounding outside active unpatented claims.

Official Prospecting Resources for Custer County, ID

Official Filing & Information Links: Custer County, ID

Custer County Clerk & Recorder
What it is: The official county recording portal and public access system for Custer County (located in Challis, ID).
Use case: Recording local unpatented mining claim location notices, filing annual Affidavits of Performance of Annual Work, and researching recorded land title documents at the courthouse.
USFS Salmon-Challis National Forest
What it is: The official U.S. Forest Service administrative portal overseeing public forest lands encompassing major mountain mining districts across Custer County.
Use case: Reviewing Forest Service rules for recreational gold panning and suction dredging along Yankee Fork, checking wilderness boundary limits, and submitting a Notice of Intent (NOI) for motorized equipment.
BLM Challis Field Office
What it is: The official Bureau of Land Management field office portal administering public domain land and mineral entry across Custer County.
Use case: Verifying open BLM public domain land availability around Challis and Clayton, checking surface management regulations, and researching active federal lode and placer claims.

Plans

Choose Your Plan

Basic

Free

$0/mo

✓Interactive mining claims map — your current state (auto-detected via GPS)
✓Land ownership overlays & active mining claims
✓Street Map & Satellite Imagery basemaps
✓Search by county
✓Compass feature
✓Claim type, name, status & size in claim popups
✕Claim serial number, BLM Records & 'Directions' button
✕Custom pins & distance measure tool
✕Live data re-sync
✕Search by claim number
✕Expired/historical claims
✕PLSS grid, Mountain Roads & Trails, Creeks/Rivers & Lakes
✕Draft A Claim tool & PDF Certificate of Location
✕Rockhound Hotspots (mineral/gem collecting sites)
✕Offline downloads

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Local Miner

Single State

$29.99/yr

Everything in Free, plus:

✓1 state of your choice, full premium data
✓Full legal location (aliquot description) for every claim
✓Claim serial number, BLM Records & 'Directions' button
✓Search by claim number
✓Custom pins (up to 50) & distance measure tool
✓Expired & historical claims layer
✓PLSS grid, Mountain Roads & Trails, Creeks/Rivers & Lakes
✓Draft A Claim tool & PDF Certificate of Location
✓Rockhound Hotspots (your state)
✓Offline map downloads

RECOMMENDED

Adventure Miner

Tri-State

$49.99/yr

Everything in Free, plus:

✓3 states of your choice, full premium data
✓Full legal location (aliquot description) for every claim
✓Claim serial number, BLM Records & 'Directions' button
✓Search by claim number
✓Custom pins (up to 50) & distance measure tool
✓Expired & historical claims layer
✓PLSS grid, Mountain Roads & Trails, Creeks/Rivers & Lakes
✓Draft A Claim tool & PDF Certificate of Location
✓Rockhound Hotspots (your 3 states)
✓Offline map downloads

Rockhound Enthusiast

National Rockhound Pass

$29.99/yr

Gem & crystal hunters, Midwest/East users — everything in Free, plus:

✓All 50 states, nationwide coverage
✓Nationwide Rockhound Hotspots + Metals/Non-Metals filters
✓Nationwide public vs. private land ownership overlay
✓Active mining claims — safety warning overlay (no owner/serial data)
✓Elevation Contours, Mountain Roads & Trails, Creeks/Rivers & Lakes, PLSS grid (where available)
✓Custom pins & distance measure tool
✓Offline map downloads
✕Claim serial number, owner intel, BLM Records & 'Directions' button
✕Expired/historical claims, Placer/Lode filters, live data re-sync

Pro Prospector

All-West

$99.99/yr

Everything in Free, plus:

✓All 13 Western states, full premium data
✓Full legal location (aliquot description) for every claim
✓Claim serial number, BLM Records & 'Directions' button
✓Search by claim number
✓Custom pins (up to 50) & distance measure tool
✓Expired & historical claims layer
✓PLSS grid, Mountain Roads & Trails, Creeks/Rivers & Lakes
✓Draft A Claim tool & PDF Certificate of Location
✓Nationwide Rockhound Hotspots (mineral/gem collecting sites)
✓Offline map downloads

Where Does Map Claim Data Actually Come From?

Staked Maps isn't crowd-sourced guesswork. Active and historical claim boundaries are parsed directly from the Bureau of Land Management's own MLRS/LR2000 case-recordation system — the same records BLM state offices use internally — and kept in sync with our database on a regular schedule. Rockhound Hotspots draw from the USGS Mineral Resources Data System (MRDS), cross-referenced by material so you can see exactly what's been found at a given site. For legal filings, always confirm current status directly with your BLM state office of record; Staked Maps is a research and navigation tool, not a substitute for the official record.

Frequently Asked Questions

Where does Staked Maps get its mining claim data?

Directly from the Bureau of Land Management's official MLRS/LR2000 case-recordation records, synced into our database on a regular schedule — not scraped or crowd-sourced.

Is Staked Maps free to use?

Yes. The free tier gives you the interactive claims map, land ownership overlays, and basemap layers for your current state, auto-detected via GPS — no subscription required. Paid plans add more states plus premium data like full legal descriptions, historical claims, offline downloads, and Rockhound Hotspots.

What's the difference between active and historical claims?

Active claims currently have valid, in-good-standing filings with the BLM. Historical claims are expired or closed filings — still useful for understanding an area's mining history and past activity.

Can I search by claim number?

Free users can search by county. Paid plans add search by claim serial number, plus each claim's full legal (aliquot) description and BLM records link.

What are Rockhound Hotspots?

A premium map layer of known mineral and gem collecting sites — sourced from USGS records and labeled by material where available (e.g. turquoise, opal, jasper) — for rockhounds looking for their next find.

How many active mining claims are in Custer County, ID?

Staked Maps currently tracks 2,943 active and 27,535 historical mining claims in Custer County, ID, plus 885 Rockhound Hotspots — synced on a regular schedule directly from the BLM's own MLRS records.

Does Staked Maps cover more than just Custer County, ID?

Yes — the live map covers all of Idaho, not just Custer County. Other Idaho counties with a dedicated page: Owyhee County, Idaho County, Shoshone County and Lemhi County.

Which agency manages mining claims in Custer County, ID?

Custer County Clerk & Recorder is Custer County, ID's primary office for filing and researching mining claims — see the Official Filing & Information Links section above for the direct link and more resources.

Legal Disclaimer

Information hosted on Staked Maps is compiled from publicly available data streams provided by the Bureau of Land Management (BLM) and relevant state geographic clearinghouses. Staked Maps accepts no liability for the content of this geospatial data, or for the consequences of any real-world exploration, land entry, or staking actions taken on the basis of the information provided via this application interface.

Staked Maps makes no warranty, expressed or implied, including the warranties of merchantability and fitness for a particular purpose, nor assumes any legal liability or responsibility for the pinpoint accuracy, reliability, completeness, latency, or programmatic utility of these geospatial data layers, or for the improper interpretation of these data grids.

These mapping layers and related graphics are visual convenience aids only; they are not legal documents and must never be used as such. The data may not be used to legally determine title, mineral ownership, valid description boundaries, jurisdictional authorities, or land restrictions in place on public or private land. Natural backcountry hazards may or may not be depicted on topographies, and land users are strictly mandated to exercise caution. Federal records are dynamic and change constantly. The end-user is exclusively responsible for validating current land classifications with local BLM field offices and managing compliance accordingly.

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