General Mining Law of 1872: Claims, Maintenance, and Patents

The General Mining Law of 1872 is the federal statute that gives U.S. citizens the right to prospect for valuable hard-rock minerals on open federal public land, stake formal claims to what they find, and extract those minerals under a system of federal rules. President Ulysses S. Grant signed it on May 10, 1872, and more than 150 years later it remains the primary legal framework governing hard-rock mining on federal land.¹ The statute codified customs that Gold Rush prospectors had already worked out across the West, replacing local rules with a single federal system for discovering, claiming, and developing mineral deposits.

What Lands and Minerals the Law Covers

The statute opens all valuable mineral deposits on federal public land to exploration and purchase by U.S. citizens or anyone who has declared an intention to become a citizen.² That broad language carries a critical qualifier: “except as otherwise provided.” Congress and the executive branch have withdrawn enormous swaths of federal land from mineral entry, including national parks, wilderness areas, military reservations, and many national monuments. Before staking anything, verify with the Bureau of Land Management that the parcel is still open to mineral entry.

The minerals the law reaches are called “locatable” minerals. These are hard-rock deposits such as gold, silver, copper, lead, tin, and platinum, along with certain non-metallic minerals like mica and gemstones. The law does not cover oil, gas, coal, or geothermal resources, which fall under separate leasing statutes. It also does not cover ordinary sand, gravel, and common stone; the Surface Resources and Multiple Use Act of 1955 pulled common varieties of those materials out of the mining laws.³ Find a gold vein on open federal land and the 1872 law applies. Want the gravel from the same wash? It does not.

Lode Claims and Placer Claims

The law recognizes two claim types, sorted by geology.

A lode claim covers a mineral vein or deposit embedded in solid rock, such as a quartz vein streaked with gold running through a mountainside. A lode claim can run up to 1,500 feet along the vein and up to 600 feet wide, meaning 300 feet on each side of the vein’s center at the surface, with parallel end lines.⁴ No claim can be located until the vein is actually discovered inside the claim boundaries.

A placer claim covers deposits that aren’t locked in rock, typically loose material like gold-bearing sand or gravel in streambeds and alluvial deposits. Placer claims must conform as closely as possible to the rectangular public land survey system, and no individual can locate more than 20 acres.⁵ An association can locate a larger placer claim, but the 20-acre cap still applies to each member.

How a Valid Claim Gets Established

Discovery of a Valuable Mineral Deposit

Everything starts with discovery. A hunch or a promising outcrop isn’t enough. The law requires an actual finding of valuable mineral within the boundaries of the proposed claim. Since 1894 the test has been the “prudent man” standard: minerals have been found, and the evidence is strong enough that a reasonable person would be justified in spending additional time and money to develop a mine with a reasonable prospect of success.⁶

For common minerals with a ready market, a stricter “marketability test” applies on top of the prudent man standard: the claimant must show the mineral could be extracted and sold at a profit. The U.S. Supreme Court endorsed this two-part framework in 1968, and it remains the governing standard.⁶ Many claims collapse here. Traces of gold in a creek bed might excite a hobbyist, but if the concentration wouldn’t support economically viable extraction, the discovery may not hold up under challenge.

Marking and Recording

After discovery you must physically mark the claim’s boundaries on the ground so they can be readily traced. Most states set their own monumenting rules covering post dimensions and placement, and those state rules matter: fail them and your claim is exposed.⁷

You also prepare a location notice with the locators’ names, the date of location, and a description specific enough that someone can find the claim on the ground using natural landmarks or permanent monuments.⁷ Vague descriptions invite later challenges. GPS coordinates alongside a traditional legal description add practical protection.

Filing With the BLM and County

You have 90 calendar days from the date of location to record the claim with both the local county recorder and the appropriate BLM State Office. Miss that window and the claim is automatically abandoned and void by operation of law, with no chance to fix it.⁸

The BLM filing carries three fees: a $25 processing fee, a $49 location fee, and an initial maintenance fee of $200 for a lode claim, mill site, or tunnel site. Placer claims carry a $200 maintenance fee for each 20-acre portion or fraction of one.⁹ That puts a single lode claim’s upfront BLM cost at $274. Failing to pay the location fee or initial maintenance fee inside the 90-day window also triggers automatic forfeiture.⁸

Keeping the Claim Alive

The September 1 Maintenance Fee

Once the claim exists, you owe the BLM an annual maintenance fee of $200 per claim on or before September 1.⁹ The statutory base was originally $100, and BLM has adjusted it upward over time.¹⁰ The deadline is absolute. Failure to pay “conclusively constitutes a forfeiture,” and the claim becomes null and void by operation of law.¹¹ No administrative appeal. No grace period.

The Small Miner Waiver

Hold ten or fewer mining claims, mill sites, or tunnel sites (counting all related parties together) and you can apply to waive the annual maintenance fee.¹⁰ The waiver requires a written certification that you meet the claim limit and that you have performed the required assessment work for the assessment year ending at noon on September 1.

Assessment work means at least $100 worth of labor or improvements on each claim during the assessment year.⁷ Physical excavation counts. So do geological surveys and geochemical sampling. The work goes into an affidavit filed with both the BLM and the county recorder.¹²

A defective waiver isn’t automatically fatal. If BLM finds a problem, you get 60 days after written notice to fix the defect or pay the full fee.¹⁰ That cure only applies to defective applications actually filed on time. File nothing by September 1 and the forfeiture provision applies with no second chance.

What an Unpatented Claim Actually Gives You

Surface Rights Are Limited

An unpatented mining claim does not give you ownership of the land. You hold the right to extract the locatable minerals you discovered and to use the surface for activities reasonably related to your mining operation. Beyond that, the federal government keeps control of the surface and its resources.³ Timber may not be harvested except what your mining or on-site structures require. The government, its permittees, and the public retain the right to access the surface as long as that access doesn’t materially interfere with mining.

This surprises many claim holders. The public can hike, camp, and recreate on the surface of an unpatented claim. If recreational use genuinely disrupts your operation, you can seek a court order, but you carry the burden of showing material interference. You cannot fence off public land and treat it as private property because you hold a claim.

Living on the Claim

Federal regulations sharply limit residence on a claim. Occupancy is allowed only when reasonably connected to active mining and cannot be primarily residential, recreational, or personal.¹³ A caretaker or watchman can stay on-site only if there is a demonstrable risk of theft or vandalism to valuable equipment or materials. Stays longer than 14 days require a showing that the work cannot reasonably be done on a daily commute basis. Before occupying, you notify BLM and receive its concurrence.

Environmental Compliance

Modern mining on federal land runs through environmental review even under this 150-year-old statute. BLM regulations sort activities by the level of surface disturbance:

Casual use covers activities with negligible disturbance: hand panning, collecting rock specimens with hand tools, metal detecting, and hand-powered drywashers. No notice or approval is needed, but no mechanized earth-moving equipment, chemicals, or explosives.¹⁴
Notice-level operations cover exploration disturbing five acres or less, or bulk sampling under 1,000 tons of ore. You file a notice with BLM and post a reclamation bond covering the full cost of restoring the land.¹⁵
A plan of operations is required for any activity disturbing more than five acres, bulk sampling of 1,000 tons or more, or operations in special-status areas. It involves a detailed proposal, environmental review, and a reclamation bond calculated as if a third-party contractor would perform the cleanup.¹⁵

You cannot break a larger project into a string of smaller notices to avoid filing a plan of operations. BLM treats that segmentation as a violation.

Patenting Is Frozen

Historically, a claimant could convert an unpatented claim into full private land ownership through patenting. That required proving a valid discovery and paying the government $5.00 per acre for a lode claim or $2.50 per acre for a placer claim. A patent gave the owner fee simple title to both surface and minerals, effectively removing the land from the public domain.

That option is currently unavailable. Since 1994, Congress has attached a rider to the Interior Department’s annual appropriations bill prohibiting the use of funds to process new patent applications. The moratorium has been renewed every year since. Every current mining operation on federal land runs through the unpatented claim system, meaning the government keeps title while the claimant holds mineral rights and limited surface use.³ The practical gap is significant: an unpatented claim requires annual fees, can be forfeited for noncompliance, and confines your surface use to mining. A patented claim functioned like any other private real estate.

The Reform Debate

The 1872 law has drawn criticism for decades. Unlike oil, gas, and coal extraction on federal land, hard-rock mining pays no federal royalties on minerals taken from public land. The patent prices of $2.50 and $5.00 per acre, unchanged since 1872, remain in the statute even though patenting is frozen. Environmental groups have long argued the law encourages mining without adequate cleanup requirements. Mining industry advocates counter that the law supplies the regulatory certainty needed to justify the capital investment hard-rock mining requires. Multiple reform bills have been introduced in Congress over the years. None has been enacted. The basic framework Grant signed remains the operative law for hard-rock mineral extraction on American public land.

1
GovInfo. Mining Law of 1872 (Act of May 10, 1872)
2
Office of the Law Revision Counsel. 30 U.S. Code 22 – Lands Open to Purchase by Citizens
3
Office of the Law Revision Counsel. 30 U.S. Code Chapter 15 – Surface Resources
4
Office of the Law Revision Counsel. 30 U.S. Code 23 – Length of Claims on Veins or Lodes
5
Office of the Law Revision Counsel. 30 U.S. Code 35 – Placer Claims
6
Bureau of Land Management. Discovery
7
Office of the Law Revision Counsel. 30 U.S. Code 28 – Mining District Regulations by Miners
8
eCFR. 43 CFR Part 3833 – Recording Mining Claims and Sites
9
Bureau of Land Management. Mining Claim Fees
10
Office of the Law Revision Counsel. 30 U.S. Code 28f – Fee
11
Office of the Law Revision Counsel. 30 U.S. Code 28i – Failure to Pay
12
eCFR. 43 CFR 3835.32 – What Should I Include When I Submit an Affidavit of Assessment Work
13
eCFR. 43 CFR Subpart 3715 – Use and Occupancy Under the Mining Laws
14
eCFR. 43 CFR 3809.5 – How Does BLM Define Certain Terms
15
Bureau of Land Management. Surface Management of Locatable Minerals