US Department of Labor - Mine Safety and Health Administration
Dated controller and operator eras per mine: 169,687 timeline rows (111,488 for platform mines), 1970-2026 with pre-1970 starts recorded as unknown. Ships as the facility_control_history side table ONLY - graph edges are withdrawn pending the ownership-graph validity redesign
Source
Feed (what to expect)
One zip (~4.3 MB), pipe-delimited; edges at fetch, timeline side table via strata.analyses.msha_control.
Quirks
Reconciliation
Schema
Feeds (axes)
Record kinds
Identifier schemes
The US half of the parent-rollup spine, data-complete but graph-deferred: the dated timeline (sample: Kennecott Minerals under Rio Tinto Group, 1995-09-01 to 1997-03-23) is on disk and mine-keyed; turning it into traversable history requires role-scoped id namespaces, a cross-role entity bridge, and validity-aware traversal and dedupe - scoped separately.
