Know your data sources.

Utah SITLA — ~3.4M acres of trust lands; strongest state-trust portfolio per acre after TX. - searchOilGasLeases ⭐ ~851 active O&G mineral leases (10 production_status) - searchInactiveLeases ~5.5K historical / expired O&G leases - searchSurfaceOwnership ⭐ ~16K. owner=Fed/Private/State/Tribal; agency=BLM/SITLA/USFS - getLeaseDetail single-lease lookup by leasegis (ML22161.0) upstream quirks: TWO origins — /mapping/rest (UtahSITLA) for Contracts; /server/rest (plpcoadmin_agol) for Ownership. Active O&G is **layer 1 NOT 0** of Contracts_Oil_Gas. class has trailing spaces ('ML '). Active dates are epoch ms; inactive dates are MM/DD/YYYY strings. Active layer has NO county — bbox/near only.