Metal Detecting in New Mexico

1. The rule, in full

New Mexico – THREE land classes, and the biggest one needs a permit to set foot on

READ THIS FIRST: nine million acres of New Mexico require a permit before you arrive

Corrected 8 Oct 2026. This page previously described New Mexico's state parks rule and its Cultural Properties Act and said nothing about state trust lands. That was an omission in the direction that can put a reader in breach rather than merely send them home, and it is the reason this section is at the top.

New Mexico has roughly nine million acres of state trust land, administered by the Commissioner of Public Lands through the State Land Office. It is not state park land, it is not federal land, and it is scattered across the state.

NMAC 19.2.19.9, "Recreational access prohibited without a permit": "Recreational access to state trust lands is prohibited in the absence of a recreational access permit issued pursuant to this rule or other express, written authorization from the commissioner. … A person engaged in recreational access in accordance with this rule shall, upon request by a state land office employee or lessee, present the person's written authorization for inspection."

You need the permit to be there at all – before any question about detecting arises. And note who may ask to see it: not only a state employee but the lessee, which on grazing-leased trust land means the rancher.

Will you know you are on it? Worse than Utah's checkerboard. The rule makes a document the test, not the ground:

19.2.19.7(D): "'Lands open to recreational access' - those lands, other than lands leased under a New Mexico state land office business lease, that are identified by the surface tract books of the New Mexico state land office…"

So whether a given parcel is even open to recreational access is settled by the Land Office's surface tract books. There is no feature on the ground that answers it, and a business lease takes a parcel out of the class entirely.

Detecting is not among the permitted activities. 19.2.19.7(C) defines "permitted activities" as those authorised by a recreational access permit and not prohibited under 19.2.19.18, and lists them: "hiking, sightseeing, picnicking, observing wildlife, non-commercial pinon nut gathering, photographing, and cross country skiing." Metal detecting appears nowhere in the rule, and the word "detector" does not occur in it.

And artifacts are expressly protected, 19.2.19.18(A)(3):

"Those activities that are not allowed on lands open to recreational access include, but are not limited to: … (3) disturbing, dislodging, damaging, defacing, destroying or removing historical, archaelogical, paleontological or cultural sites, or artifacts."

(The misspelling of "archaeological" is the rule's own.)

What a breach is, 19.2.19.15: prohibited activities on lands open to recreational access "are deemed to be in trespass, waste, or both." The permit is also cancellable at will, by oral notice, under 19.2.19.17, and a permittee indemnifies the commissioner and the lessee under 19.2.19.16.

So the New Mexico answer in order of what a reader hits first:

• Is the parcel trust land? Check the State Land Office surface tract books. You cannot tell by looking.
• If it is, do you have a recreational access permit? Without one, being there is prohibited, whatever you are carrying.
• Even with one, detecting is not a permitted activity under 19.2.19.7(C), and disturbing or removing an artifact is prohibited outright by 19.2.19.18(A)(3).
• Breach is trespass, waste, or both. Read from NMAC 19.2.19, "Recreational and Educational Access to State Trust Lands", in full, 15,593 characters. Issuing agency: Commissioner of Public Lands, New Mexico State Land Office. Statutory authority: N.M. Const. Art. XIII, Section 2, and NMSA 1978 Sections 19-1-1 and 19-1-2. Effective 13 December 2013, amended 11 June 2019. Checked 8 Oct 2026. Not established: the penalty attaching to trespass or waste on trust land. The rule deems the conduct trespass or waste; the statutory consequence under NMSA title 19 was not read for this entry. Recorded as unread rather than estimated. Compare Utah, where the equivalent statute carries treble damages and a second degree felony. How this was missed, recorded because it is the useful part. This document was fetched and read in full during the land-class sweep, and correctly found to contain no detector provision. The sweep asked "is there a detector rule here", got a true answer, and recorded it. The access requirement was outside the question, so it never reached this page. The document was on disk the whole time. See sweep/README.md, "The dimension found by accident twice".

New Mexico state parks – 19.5.2.24 NMAC

Operative text, read from the consolidated NMAC at srca.nm.gov (State Records Center and Archives, the official NMAC publisher):

19.5.2.24 NMAC METAL DETECTING: "Metal detecting within a state park is prohibited unless a visitor obtains the superintendent's permission to use metal detectors for scientific activities such as projects permitted through the New Mexico cultural properties review committee or to retrieve lost items."

Scope, 19.5.2.2 NMAC:

"19.5.2 NMAC applies to persons using the New Mexico state parks system."

Determination: the state parks system only. Does NOT reach municipal parks.

NOT this rule: 19.5.2.25, rock collecting, and the 12-inch handle

Added 8 Oct 2026, after the New Mexico post was found to have built three sections on it. Recorded here as negative space, because the next person to read this entry will meet the same confusion.

The section immediately after the detecting rule is where every guide's "New Mexico limits digging tools to 12-inch handles" comes from:

19.5.2.25(A): "Rock collecting is permissible in areas designated by the secretary and posted at the rockhound unit of Rockhound state park." 19.5.2.25(C): "Rock collecting is limited to small hand tools only. The following are prohibited: mechanical or motorized tools and equipment, tools with a handle longer than 12 inches, wheeled devices such as wheelbarrows, carts or wagons." [19.5.2.25 NMAC - Rp, 19.5.2.23 NMAC, 1/1/2008; 19.5.2.25 NMAC - N, 1/1/2013; A, 1/1/2025]

It governs a different activity at one named park. 19.5.2.24, metal detecting, sets no tool limits at all. Do not let the two merge, and do not quote the 12-inch figure on the New Mexico page as a detecting rule.

The 1/1/2025 amendment is also the explanation for a date that turns up in secondary sources: a 2025 change to this part is real, and it is to the rock collecting section, not to the detecting one.

Re-read 8 Oct 2026 and 19.5.2.24 is unchanged. Its history line still ends at 1/1/2013. Checked because a post cited "Register Vol. 36, No. 12, dated June 24, 2025" and the possibility that our quotation was stale had to be closed rather than assumed. srca.nm.gov parts/title19/19.005.0002.html, 195,792 bytes, 59,340 characters of text.

Note the shape: prohibited by default, with superintendent permission available for two named purposes, one of which – retrieving lost items – is an ordinary detectorist errand rather than a scientific one. Status is permit_required, and the "to retrieve lost items" clause should be quoted on the page, because it is the part a reader will actually use.

Latest amendment shown: 1 January 2013.

RESOLVED: New Mexico DOES reach municipal land

Resolved 19 Sep 2026 by reading NMSA 1978 chapter 18 at source, in the official consolidated compilation at nmonesource.com.

18-6-3(E): "'state land' means property owned, controlled or operated by a department, agency, institution or political subdivision of the state."

18-6-9(A): "Any person who knowingly excavates, injures or destroys cultural property located on state land without a permit is guilty of criminal damage to property."

A municipality is a political subdivision of the state, so the Cultural Properties Act reaches New Mexico city parks. The full entry has moved to STATE-LAND-political-subdivision.md, which now holds six states rather than five.

The two instruments do different jobs and both belong on the New Mexico page:

• 19.5.2.24 NMAC governs the state parks system and is a superintendent-permission rule – this entry, above.
• NMSA 18-6-9 governs state, county and municipal land and prohibits knowingly excavating, injuring or destroying a cultural property – the political-subdivision file. Do not merge them. The first is a rule about where you may sweep; the second is a crime about what you may dig up, and it applies in every New Mexico city on the list. Why the flag was nearly resolved the wrong way. The NMAC rules carry the municipal enumeration but are scoped to "archaeological investigations", which is the Kansas answer – reaches the land, not the activity. Stopping at the rules would have produced "does not reach the hobbyist". The statute is what settles it, and only reading the statute settled it. Sources: srca.nm.gov parts/title19/19.005.0002.html; srca.nm.gov parts/title04/04.010.0008.html; srca.nm.gov parts/title04/04.010.0016.html. Checked 19 Sep 2026. What was read for the land-class sweep, and what was not. Read: 19.2.19 NMAC in full. Not read: the Department of Game and Fish rules at 19.30 to 19.35 NMAC. The finding above therefore covers what was read and nothing beyond it – see sweep/README.md, "A KNOWN LIMIT OF THIS SWEEP", on why a chapter set aside on its title is an unread chapter.

2. Where it reaches city and county land

New Mexico – NMSA 1978, 18-6-1 to 18-6-17 (Cultural Properties Act)

Read from the official consolidated NMSA 1978, chapter 18, at nmonesource.com (New Mexico Compilation Commission), parsed locally.

Scope text, 18-6-3(E):

"'state land' means property owned, controlled or operated by a department, agency, institution or political subdivision of the state."

Scope: reaches municipal land. A New Mexico municipality is a political subdivision of the state, so a city park is "state land" for this Act. Note that the statutory definition is broader than it looks and broader than the term suggests – this is the one place in the project where a defined term means close to the opposite of its ordinary reading, and the page must quote the definition rather than the term.

Definition, 18-6-3(B):

"'cultural property' means a structure, place, site or object having historic, archaeological, scientific, architectural or other cultural significance."

Operative text, 18-6-9(A) and (C):

"A. Any person who knowingly excavates, injures or destroys cultural property located on state land without a permit is guilty of criminal damage to property." "C. Whoever commits criminal damage to property pursuant to the provisions of this section and the value of the property excavated, injured or destroyed is: (1) less than one thousand dollars ($1,000) is guilty of a petty misdemeanor…; or (2) one thousand dollars ($1,000) or more is guilty of a fourth degree felony."

What it actually prohibits: knowingly excavating, injuring or destroying a cultural property. Not detecting. The words "metal detector" appear nowhere in the Act.

What makes New Mexico the most serious of the six, and the reason it should not be flattened into the same sentence as Kansas:

• It reaches objects, not only sites. Kansas and Washington reach an "archaeological site"; Colorado reaches a "resource". New Mexico's defined term expressly includes an object having historic, archaeological, scientific, architectural or other cultural significance. A single artefact in a city park is within scope on its own, with no site around it.
• The exposure is felony-grade. At a value of $1,000 or more it is a fourth degree felony under 18-6-9(C)(2). No other state in this group carries that.
• "Knowingly" is doing real work. The offence requires knowing excavation, injury or destruction of cultural property. A detectorist who digs a modern coin has not knowingly excavated cultural property. One who recognises what is under the coil and digs anyway has. The page should say this, because it is the distinction that actually governs a reader's conduct, and it is the one an aggregator would drop. No permit route for a hobbyist. Permits under the Act run through the cultural properties review committee and the implementing rule, 4.10.8 NMAC, whose scope at 4.10.8.2 is entities "conducting or proposing to conduct archaeological investigations" – defined at 4.10.8.7(A) as "[t]he study of archaeological sites, isolates and areas of historic and scientific interest". That is a scheme for archaeologists. There is nothing a detectorist can apply for. Directory entry should read: on state, county and municipal land in New Mexico it is a crime to knowingly excavate, injure or destroy a cultural property – which includes a single object of historic or archaeological significance – without a permit, and at $1,000 or more it is a felony. It should NOT read that metal detecting is prohibited in New Mexico city parks. New Mexico state parks are governed separately by 19.5.2.24 NMAC, which is a superintendent-permission rule and reaches only the state parks system. How this was nearly missed. The NMAC rules (4.10.8.7(SS), 4.10.16.7(T)) carry an enumerated definition of "state land" that lists "county and municipal property including open space areas" – but those rules are scoped to archaeological investigations, which is the Kansas answer, so the rules alone would have supported a "does not reach the hobbyist" finding. The statute is what settles it, and the statute had to be read to settle it. This is rule 11 paying for itself a second time in one day. Sources: NMSA 1978 chapter 18, nmonesource.com item 4346, document.do, parsed locally with pypdf; srca.nm.gov parts/title04/04.010.0008.html. Checked 19 Sep 2026.

3. Cities in New Mexico that publish a rule

1 city in New Mexico publishes a rule we can quote, out of 19 checked.

Of the 19 checked, 5 had pages on the city’s own site that we found and read. For the other 14 we could not locate a municipal source, so nothing is claimed about them either way.

4. County rules

No county check has been run for New Mexico. That is not a finding that New Mexico’s counties publish no rules. It means the question was never asked here, and this directory does not assert an answer it has not looked for. The county sweep covered 21 states; New Mexico was not one of them.

5. Cities checked - no published rule

18 cities in New Mexico were checked and have no published rule on this page. Of those, 18 returned no rule, and 0 did return something that has not been published – mostly rules that turned out to govern county land, which are in the county section above. A city here is not a city where detecting is allowed. It is a city whose own published material did not answer the question.

All 18 were checked on 13 September 2026, in one sweep, so that date applies to every row.

6. Land this page does not cover

This page answers for New Mexico state land, and for city and county land where the state rule reaches it. Several other kinds of ground are not covered here, and naming them is more honest than letting a reader assume the page is complete.

Tribal land. This directory does not cover it, and will not.

There are 574 federally recognised tribal nations. Each is a sovereign jurisdiction with its own law, its own permitting, its own enforcement and its own cultural-resource provisions, and none of them is answered by a state's code or by any federal rule quoted on these pages. A one-line instruction to "get tribal permission" would be worse than this paragraph, because it implies one process and one authority where there are 574. If you are on or near tribal land, the governing law is that nation's, and the place to ask is that nation's own offices. Nothing on this page applies there.

BLM land is covered, partly, in its own place. The Bureau of Land Management holds about 245 million acres and the federal rule names metal detectors and permits them, which is the opposite of the national park rule. See BLM land: the detector is named, and permitted. That page covers the base regulation; it does not yet cover the supplementary rules individual BLM State Directors issue for particular field offices.

Named and not examined. These are recorded so their absence is visible rather than silent. No claim is made about any of them:

• Military withdrawn land, including ranges and training areas.
• Bureau of Reclamation land, which surrounds a great many reservoirs.
• Water district and irrigation district land.
• Wilderness, Wilderness Study Areas and National Conservation Areas, which carry designations of their own. And one general point about signs. The commonest piece of reasoning in this subject is "there was no sign, so it was allowed." Arizona's State Land Department answers it in writing, in condition 2 of its own Recreational Permit terms:

"You will comply with all laws, rules, regulations and ordinances. Posting is not required for these provisions to be enforceable."

That is Arizona's sentence about Arizona's provisions and this directory does not present it as the law of any other state. But the proposition it states is the one to carry: nothing read for this project makes a published rule's enforceability depend on a sign at the boundary. Where posting does matter, a specific provision says so, and that provision is quoted on the page where it occurs.