BLM MLRS Mining-Claim Status Intelligence

Look up the current status of a U.S. mining claim in the Bureau of Land Management's Mineral & Land Records System (MLRS), and follow timestamped claim-status transitions — especially newly closed claims — from a daily-harvested archive that starts at this actor's launch and cannot be backfilled.

This is mining-claim status intelligence. It is not a list of "newly available claims."

What you get

Lookup mode — $0.25 per successful lookup (no charge when nothing is found) Give a MLRS serial number (e.g. CA101754060), a legacy serial (e.g. CAMC113925), or a claim name. You get the claim's recorded disposition/status, claim type (lode, placer, mill site, tunnel site), recorded acres, PLSS/MTRS location(s), and the record's created / last-modified dates — each with the source name and retrieval timestamp.

Delta mode — $0.05 per transition record returned The daily harvest diffs BLM's closed-claims layer against the previous day's snapshot and records transitions, distinguishing:

• NEWLY_CLOSED — a serial that was not in the closed set before and is now Closed.
• PREVIOUSLY_CLOSED_MODIFIED — a claim that was already Closed whose MLRS record changed. This is not a new closure, and it is labeled as such.

BLM's own closed-claims GIS service already covers roughly the last year of updates; what it does not give you is this actor's timestamped transition history — which serials crossed into Closed on which detected date, separated from records that merely changed.

Read this before acting on a result

• Status only. A Closed disposition does NOT establish that land is legally available to re-stake. Staking eligibility requires separate land-status verification — withdrawals, segregations, overlapping rights, valid existing rights, and state/county records are not determined by claim status alone.
• Closure reasons are labeled. Every closed record carries the reason BLM recorded (the disposition itself, basis: RECORDED) and, separately, any timing-based explanation this actor offers (basis: INFERRED). An INFERRED reason — for example, possible maintenance-fee forfeiture inferred from a fall modification date — is this actor's assertion, not a BLM finding. Do not stake or spend money on an inferred reason without separate verification.
• Locations are approximate. BLM maps mining claims by administrative quarter-section from the Legal Land Description (PLSS/MTRS). That is not the legal claim boundary as staked and monumented; boundaries live in the accepted Notice/Certificate of Location in the official case file at the BLM State Office.
• As filed — verify. Every record carries its source and retrieval timestamp and is presented as filed in BLM MLRS public records. Verify against the official MLRS record before acting.

Seasonality

Mining-claim maintenance fees ($200 per claim) are due September 1 each year (43 CFR Part 3834), and assessment-work affidavits are due December 30. Closures therefore concentrate in September–January. Expect the delta feed to be busy in the fall and quiet in spring/summer. The harvest runs daily year-round regardless.

Freshness / heartbeat

The harvest is fully automated with retry tolerance — if BLM's services are unreachable, that day's harvest skips, logs, and retries on the next cycle; no human step is ever required. Because a silent skip must never sell stale data as fresh:

• Every output carries the last successful harvest date and a stale flag.
• The feed is marked stale if no harvest has succeeded in 36 hours, or if a harvest during forfeiture season (Sep–Jan) returns zero changes.
• While the feed is stale, delta mode emits no paid records and charges nothing.

Source

BLM Mineral & Land Records System (MLRS) public records, via BLM's National Landscape Data ArcGIS services (MLRS Mining Claims — Closed / Not Closed layers, public domain). Holder (claimant) names are not published in these GIS layers and are therefore not returned; consult the official MLRS case file for holder information.