Mining Claim Map: BLM Claims Search and Filing Fees

What a BLM Mining Claim Actually Grants

The Bureau of Land Management administers 245 million acres of surface estate and 700 million acres of onshore federal mineral estate, per BLM’s own program figures. A mining claim under the 1872 Mining Law gives the claimant the exclusive right to develop and remove locatable minerals from a defined parcel within that estate. It does not convey:

• ✔ Surface ownership — the land itself remains federal property; the claimant holds a possessory interest tied to mineral development.
• ✔ Exclusive surface use — grazing permittees, hunters, and other authorized users generally retain access rights unless mining activity requires reasonable exclusion for safety.
• ✔ Permanent title — a claim lapses if annual fees or assessment-work documentation are not filed on schedule (see the fee table in Section 4).

What it does grant: the right to explore, develop, and sell minerals found within the claim’s boundary, subject to BLM mining claims regulations on surface disturbance, reclamation, and multiple-use coordination with agencies like the U.S. Forest Service where claims sit on National Forest System land.

Claim Facts at a Glance

• ✔ Data: BLM publishes a national layer of claims that are not closed; it maps claims only to the quarter section.
• ✔
• ✔ Land base: 245 million acres of surface, 700 million acres of subsurface mineral estate under BLM administration.
• ✔ Two claim types: lode (hard rock) and placer (unconsolidated material) — covered in full in Section 2.
• ✔ Annual obligation: maintenance fee or assessment-work filing, due before September 1 each year (see Section 4).

▶ Farmonaut explainer: owning a gold claim is not owning the land. · 3:19

Lode vs. Placer Claims: Sizes, Targets, Filing Differences

Every BLM mine claim falls into one of two categories, and the map symbol, size limit, and fee structure differ between them.

• Lode Claims (Hard Rock):
  • Cover mineral-bearing veins or lodes in place within hard rock.
  • Common targets: gold, silver, copper, lead, zinc, and associated ores.
  • Standard size: up to 1,500 feet by 600 feet, following the strike of the vein.
  • Annual maintenance fee: $200 per claim (2026 BLM fee schedule).
• Placer Claims (Loose, Unconsolidated Materials):
  • Target minerals in loose material — sand, gravel, alluvium.
  • Common targets: placer gold, gemstones, heavy mineral sands.
  • Standard size: up to 20 acres per individual claimant; associations of up to eight persons can hold up to 160 acres.
  • Annual maintenance fee: $200 per 20 acres or portion thereof — a 20-acre placer claim and a 3-acre placer claim both owe the full $200 increment.

Mill site and tunnel site claims — auxiliary claims used to support a lode or placer operation with processing infrastructure or tunnel access — also carry the $200 annual maintenance fee per site, identical to lode claims, per BLM’s fee schedule.

How to Read the BLM Mine Claims Map (MLRS Walkthrough)

BLM’s Mineral & Land Records System (MLRS) is the system of record — it is the database every state GIS portal and every third-party claims map ultimately pulls from. A companion resource, the BLM Mining Claims GIS Map Server, exposes the same claim polygons as a map service layer that GIS software can consume directly.

To check whether a parcel is claimed:

1. Open MLRS and search by legal description (township/range/section), county, or claim name rather than by coordinates alone — claim records are indexed to the Public Land Survey System, not lat/long.
2. Filter by status. MLRS distinguishes active, closed, and pending claims. A claim showing “closed” has lapsed — usually for missed fees — and the ground reverts to open for new location, but confirm the closure date, since a claim can be reinstated within a limited window in some circumstances.
3. Cross-check the claim’s serial number against the case file if you need filing dates, claimant name, or fee-payment history — MLRS links to case recordation.
4. Load the GIS layer from the map server URL above into QGIS or ArcGIS if you’re overlaying claims against your own AOI, soil, or satellite-derived mineral targets.

State-level portals, such as Alaska’s Alaska Mapper, show BLM claim data and can be useful for a faster first look, but MLRS itself remains the authoritative source when a filing date or fee status is in dispute.

Which tool answers which question

MLRS offers three ways in, and each answers a different question. The research map inside MLRS finds cases by location or serial number and opens the serial register page for a case (BLM, 2023). The public mining claim reports, at reports.blm.gov/reports/MLRS, list claims in a state, township or section. And BLM publishes a national “Not Closed” claims layer for download as CSV, GeoJSON, KML or shapefile (BLM data set, updated October 2026).

How precise is the BLM claim map

Less precise than most people expect. BLM requires a claim to be identified only to the affected quarter section, so the map layers usually show quarter-section precision. Shapes come from legal land descriptions and each case carries a quality score, from a direct match to the survey grid down to county-only placement, and some cases have no shape at all. Claim boundaries as staked are in the notice of location in the official case file, not in the data layer (BLM). Treat the map as a first filter, and request the case file before you buy or stake next to a claim.

Mining claim lookup by name or serial number

MLRS serial numbers combine a two-letter BLM state code and a nine-digit number; mining claim serials leave out the geographic state code, and legacy serial numbers still work in searches (BLM, 2023). If you only know the claim name or the location, use the Geographic Report: pick the state, enter the meridian, township, range and section, and set the status to active or closed. One quirk noted by a long-time user of the system: Washington claims are filed under Oregon and South Dakota claims under Montana in the state field (Western Mining History). BLM’s fees are for filing and holding claims; the claim reports and the data layers are published for the public to read and download.

BLM Mining Claim Fees: Filing, Maintenance, Small-Miner Waiver

BLM publishes its fee schedule annually, and figures below are current per BLM’s official schedule as verified for 2026. Because BLM adjusts fees from time to time (the lode fee rose from $165 to $200 with the 2025 assessment year, per BLM), treat this table as a snapshot and confirm against BLM’s mining claim fees page before you file or pay.

For comparison, the lode maintenance fee sat at $165 per claim before the 2025 adjustment — a jump to $200 in the current schedule, per BLM records. Because BLM has adjusted this fee before, do not assume the $200 figure holds indefinitely; the linked fee page is updated by BLM directly each year and is the fastest way to catch a change before your payment deadline.

Small miners holding 10 or fewer claims may file the Maintenance Fee Waiver Certification (Form 3830-2) instead of paying the maintenance fee, then file the Affidavit of Annual Assessment Work by 30 December, documenting at least the statutory minimum of labor or improvements performed on the claim that assessment year. This route costs $15 in processing versus $200 in maintenance fees per claim — a meaningful difference for anyone holding a handful of claims and doing the assessment work themselves.

7 Practical Tips for Using the BLM Claims Map

1. 1. Search by legal description, not just a pin drop.
   MLRS indexes to township/range/section. A coordinate search alone can miss claims recorded against the PLSS grid.
2. 2. Check the status field on every claim you find.
   “Active,” “closed,” and “pending” carry different legal weight — a closed claim may still show on some map layers until the next data refresh.
3. 3. Cross-reference the GIS map server for overlay work.
   The Mining Claims GIS Map Server feeds directly into QGIS/ArcGIS, letting you stack claim boundaries against your own soil, slope, or satellite-derived targets.
4. 4. Verify overlap with grazing allotments, timber permits, or watershed protections before staking or purchasing — surface use rights can coexist with a claim but require coordination.
5. 5. Confirm the claim’s fee-payment history if you are buying an existing claim rather than filing new — a claim in arrears can be terminated regardless of what the seller states.
6. 6. Watch the September 1 maintenance deadline.
   BLM’s annual fee schedule and its Mining Season Packet post updated rates and requirements ahead of this date every year.
7. 7. Screen for mineral potential before staking, not after.
   Tools like satellite-based mineral detection and 3D prospectivity mapping can flag alteration zones before you commit to the $274 filing cost and the recurring $200 annual fee per claim.

Map your own site here: mining.farmonaut.com — visualize target zones and cross-reference against claim boundaries before committing field time.

Claim mapping: from stake to record

A claim exists on paper only when it is recorded. Federal rules say you forfeit a claim if you fail to record it with BLM within 90 days of locating it, or fail to pay the location fee and first-year maintenance fee in the same window (43 CFR Part 3830). The filing carries a notice of location and a map. BLM’s California packet lists the fees for a new lode claim as $25 processing, $49 location and $200 first-year maintenance, $274 in total, with placer claims paying the $200 per 20 acres or part of 20 acres (BLM California, 2027 mining season). Counties also take a copy of the notice. Draw the map from the same grid description you used on the ground, so the BLM record and the recorder’s copy match.

Holders of 10 or fewer claims nationwide who have done $100 of assessment work can file the Maintenance Fee Waiver Certification (Form 3830-2), which has no filing charge. They then file an Affidavit of Annual Assessment Work and pay $15 per claim by 30 December 2026 for the 2027 assessment year (BLM California, 2027 mining season). That is the $15 route in the fee table above.

▶ Farmonaut explainer: how to read a mining GIS map, with licence boundaries and anomaly zones. · 5:38

Where Claims Meet Farmland, Forestry & Water

BLM’s 245 million surface acres overlap extensively with grazing allotments and, in places, adjacent private farmland and National Forest System timber tracts. A mining claim does not extinguish these other uses; it adds a layer that all parties need to check against the same map.

• 🌾 Agriculture/Grazing: ranchers holding BLM grazing permits should check claim boundaries before planning new fencing, water infrastructure, or seasonal rotation near active claims.
• 🌲 Forestry/Timber: where claims sit on or adjacent to National Forest System land, timber sale planning needs to account for claim access roads and surface disturbance limits.
• 💧 Water: irrigation diversions and stock-water infrastructure downstream of a claim should be checked for sediment and reclamation obligations tied to that claim’s operating plan.

None of these figures — the specific acreage of overlap, the number of active claims sitting inside grazing allotments, or a breakdown by watershed — are published by BLM at a national level. If you need that number for a specific allotment or forest unit, the method is to pull the claim polygons from the GIS Map Server and intersect them in GIS software against your allotment or unit boundary — there is no substitute for running that overlay on your own parcel.

Alaska mining claims map

Alaska has its own map tools. BLM’s Alaska guide points to BLM’s Spatial Data Management System, where you switch on the federal mining claims layer, and to the State of Alaska’s Alaska Mapper, which shows both federal and state claims; BLM passes its federal claim data to the State each time it updates (BLM Alaska, August 2026). Use the State view when the ground might carry a state claim as well. The guide also lists the State recorder’s office for location notices. BLM’s California packet notes that online maintenance payments in MLRS exclude claims in Alaska, so check how to pay before the next 1 September deadline (BLM California, 2027 mining season). For the staking steps and costs, see our guide to getting a gold claim in Alaska, and for other countries’ registers, mining cadastre portals by country.

Using the claim layer with satellite data

Because the downloadable layer is quarter-section based, it works best as a screen. Overlay it on satellite alteration or iron-oxide maps to see which promising ground is already held, then confirm boundaries in the case files before spending on staking.

Farmonaut: Satellite Mineral Intelligence Before You Stake

At Farmonaut, we apply Earth observation, remote sensing, and AI to screen ground for mineral potential before anyone files a claim or pays a maintenance fee on it. The goal is to spend the $274 filing cost and the $200 annual fee only on ground worth holding.

How Farmonaut Supports BLM Claim Decisions

• 🔎 Mineral Detection Without Disturbance: Our satellite-based mineral detection platform flags alteration zones and target minerals before any ground disturbance, reducing field costs and permitting risk.
• 🌐 Rapid Regional Screening: We screen thousands of acres in days rather than months, exporting results compatible with BLM claims map data and GIS platforms for direct overlay against MLRS polygons.
• 📈 3D Prospectivity & Drilling Intelligence: Our 3D mineral prospectivity mapping supports drill-angle optimization and subsurface visualization before committing to exploration drilling.
• 💡 Cost & Time Savings: Early-exploration costs can be up to 80-85% lower and results can take days instead of months, freeing budget for filing fees, reclamation, and compliance work instead of blind-drilling.

To get a customized quote for your next mineral detection or mapping project, Get a Quote with Farmonaut.

FAQs on BLM Mine Claims and the Claims Map

• Q: Do BLM mining claims grant full land ownership?
  A: No. A claim grants the right to explore and extract locatable minerals, not surface ownership. Grazing, timber, and recreational uses can coexist on the same ground.
• Q: How do I check if land is covered by an existing BLM mine claim?
  A: Search MLRS by legal description, or load the GIS Map Server layer into mapping software for a spatial overlay.
• Q: What does it cost to file a new BLM mining claim in 2026?
  A: $274 total for a new lode claim ($49 location fee + $25 processing fee + $200 first-year maintenance fee), per BLM’s current fee schedule. Placer claims follow the same location and processing fee structure.
• Q: What is the annual cost of holding a claim?
  A: $200 per lode claim, mill site, or tunnel site per year; $200 per 20 placer acres or portion thereof — up from $165 for lode claims before the 2025 fee adjustment. Small miners with 10 or fewer claims may instead file a $15 Affidavit of Annual Assessment Work.
• Q: What’s the difference between a lode and a placer claim?
  A: Lode claims cover hard-rock veins (up to 1,500 by 600 feet); placer claims cover loose material like gravel or alluvial gold (up to 20 acres per individual claimant).
• Q: How many active BLM mining claims exist nationally?
  A: BLM publishes no single active total on its public pages; the Not Closed layer includes pending cases, so filter on status. The claims sit across BLM’s 245-million-acre surface estate and 700-million-acre mineral estate.
• Q: Can I lose my claim if I miss a payment?
  A: Yes. Missing the September 1 annual maintenance fee or assessment-work filing deadline can result in claim termination and the ground reverting to open status.
• Q: Who do I contact for mapping or mineral-detection project help?
  A: Reach out via our Contact Us form, or explore claim-sale logistics in our companion guide on securing a mining claim purchase in 7 steps.

Q: Does the BLM claims map show exact claim boundaries? A: No. Claims are mapped to the quarter section at best, and some have no shape. The exact description is in the notice of location in the BLM case file.

Q: Is the BLM claim search a paid service? A: BLM’s fees apply to filing and holding claims. The public claim reports and the Not Closed data layer are published for reading and download.

Q: What is a mining claim lookup by serial number? A: Enter the serial number in the MLRS research map or run the Serial Register Page report to see the case record for that claim.

Q: Where is an Alaska mining claims map? A: Use BLM Alaska’s SDMS for federal claims and the State’s Alaska Mapper, which shows federal and state claims.

Conclusion: Verify Before You File

The durable method here does not change even as fees and claim counts shift year to year: search MLRS by legal description first, confirm the status field, cross-reference the GIS map server for any spatial overlay, and check the current fee schedule before paying or filing. That sequence works whatever the national claim count is, and whether the lode maintenance fee is $200 or has been adjusted again.

What can and will change: fee amounts (confirm at BLM’s fee page before every payment), the national claim count (recheck MLRS directly), and state-specific overlays with grazing, timber, or watershed programs (run the GIS intersection yourself for your parcel). What does not change: the map is the record, the September 1 deadline is fixed, and no claim implies land ownership.

• Action steps:
  • Search your parcel on MLRS before staking or buying.
  • Screen for mineral potential first with satellite-based mineral detection.
  • Review claim-purchase logistics in Mine Claims for Sale: Secure a Mining Claim in 7 Steps.
  • Contact our team for mapping and compliance support: Contact Us.
  • Map your own site instantly: mining.farmonaut.com.