Know your data sources.

Alaska DNR state trust lands + mineral permits/leases + state mining claims + land-status overlays — Land Records System via ArcGIS REST. - searchOilGasLeases ⭐ ~1.7K active O&G + offshore leases (1.95K MineralPermitOrLease) - searchOilGasLeaseSaleTracts ⭐ ~6.3K active sale-tract polygons - searchMiningClaims ⭐ active 38.4K / pending 191 / closed 79.5K - searchLandStatus 4 curated layers: lease 5.2K / mineralOrder 4.5K / miningClaims 120K / stateLand 27K - getLeaseById, listLayers, getServiceInfo §0 spec drift: dog.dnr.alaska.gov returns HTTP 500 on every query — public surface is arcgis.dnr.alaska.gov. AK has NO borough column on these layers — use bbox/near.

Michigan DNR mineral leases, state-managed parcels, ownership, current rights, and conservation easements via the DNRLOTSParcelsOPENDATA FS on services3.arcgis.com. 6 curated layers from MI DNR LOTS Open Data. - searchMineralLeases ⭐ 5.5K leases (5097 O&G / 231 Metallic / 53 Nonmetallic / 66 Gas Storage / 61 Surface Use) - searchManagedLands ⭐ 135.9K parcels by division (Forest Resources / Parks & Rec / Wildlife) - searchDnrParcels 132.7K DNR-tracked parcels - searchConservationEasements ⭐ 1.3K development-rights easements - searchLeaseNominations 25 pending §0: research DEQ/Mineral_Lease/MapServer dead — live data via Hub discovery. Leases have empty geometry. Status A/E codes; LeaseType has trailing whitespace.

Montana Board of Oil and Gas Conservation (BOGC) — wells (~42K), directional well paths (~4.1K), and DNRC Mineral Mgmt Bureau active state O&G leases (~1.2K). - searchWells ⭐ 41,960 wells with operator, status (P&A Approved, Producing, Shut In), type (Oil, Gas, CBM, Injection) - searchActiveLeases ⭐ 1,186 state O&G leases with County UPPERCASE, customer, primary-term flag - searchWellPaths ⭐ 4,113 directional well paths with formation - getWellByApi, getServiceInfo §0 spec drift: MBMG (state geological survey) Hub returns 403 — DROPPED. BOG_Wells layer has NO County column — county filter on wells must use bbox or PLSS Township/Range. APIWellNumber stored 14-digit unpacked. CRS varies (4269/32100); outSR=4326 works.

North Dakota Department of Trust Lands. AGOL Feature Services from owner jstegmiller@nd.gov_NDDTL; no auth. - searchOilGasLeases (~33K mineral tracts; 8.9K active) ⭐ filter county, lessee, eligible (default Leased) - getExpiringLeases ⭐ acquisition signal — leases expiring within windowDays - searchSurfaceLeases (~4.9K grazing/ag), getLeaseDetail, getServiceInfo upstream quirks: NDDTL does NOT publish OG-leases as a separate layer; they live inside the unified TrustLandsMineralsVW (filter lease LIKE '%OG-%'). exp/effective stored as MM/DD/YYYY string with " " for null. Counties Title-Case (different from ND DMR's UPPERCASE). landtrustdash.nd.gov is offline — AGOL views are the working public surface.

New Mexico State Land Office state-trust mineral leases. Permian parallel to TX GLO. No auth. - searchOilGasLeases (~5.9K) ⭐ active O&G leases — Permian Basin - getExpiringLeases ⭐ acquisition-signal feed across O&G/mineral/commercial/ag - searchMineralLeases (~746) — Salt Water Disposal, Caliche, Potash, Coal - searchAgriculturalLeases (~3.8K), getLeaseDetail, getServiceInfo upstream quirks: NMSLO publishes only ACTIVE leases (single STATUS value). NO COUNTY column on any layer — use bbox/near. Held-by-production leases have term-end at year-9999 epoch (surfaced as null daysUntilExpiry).

Oklahoma Commissioners of the Land Office state-trust real estate + mineral leases. SCOOP/STACK parallel. No auth. - searchLeases ⭐ category=real-estate (default, ~2.9K) | mineral (~4.5K, activeOnly default true) - getExpiringLeases ⭐ defaults to curated Expiring Real Estate Leases layer (~580) - getLeaseDetail, searchWellInventory (OCC mirror, ~576K), getServiceInfo upstream quirks: BeginDate/EndDate are ISO YYYY-MM-DD strings (server-side date filters work). CountyName UPPERCASE upstream. Mineral layer mixes ACTIVE + EXPIRED — use activeOnly=true (default). LeaseType values on Real Estate: Agricultural / Short-term Commercial / Long-term Commercial.

Texas General Land Office state lands. No auth. O&G: searchActiveLeases (~7.3K) ⭐ royalties+primary-term dates, getExpiringLeases ⭐ acquisition feed, searchInactiveLeases (~12K), getLeaseDetail, searchLeaseUnits, searchPSFLands (~21.9K), searchEasements, searchOffshoreStructures, getNominatedTracts. Coastal/land: searchUplandLeases, searchSubmergedTracts (~11K), searchBeachAccess, searchCoastalLeases (~9.2K), searchStateAgencyLands, searchNavigationDistricts, searchPriorityHabitatAreas, searchEsiShoreline (~48K lines), searchInSituBurnExclusion + boundary getters (Coastal Zone, 3-league/3-mile lines, Dispersant Zone, lease polygons). getServiceInfo for schemas. Quirks: MM/DD/YYYY string dates; most non-lease layers have no COUNTY column; ESI/boundary layers return line geometry.