{"data":{"schemaVersion":"realm.temporal-relationships.v1","temporalSemantics":{"validTime":{"granularity":"date","bounds":"inclusive","nullStart":"start date not published in the upstream history row","nullEnd":"open-ended in the upstream history row; not independent proof of present control"},"transactionTime":{"observedAt":"2026-10-13T11:19:05.459773+00:00","meaning":"time the checksum-addressed MDRS artifacts were observed by the PostgreSQL ingestion"},"derivation":{"controllerControlsOperator":"intersection of controller and operator valid-time intervals evidenced through this mine","currentIdentity":"current controller and operator are asserted only by the MDRS Mines snapshot"}},"current":{"mine":{"type":"mine","id":"4202179","name":"Bluffdale Pit"},"operator":{"type":"operator","id":"L01838","name":"Kilgore Contracting"},"controller":{"type":"controller","id":"M02046","name":"Summit Materials LLC"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M01655","name":"Harold  Elam"},"object":{"type":"mine","id":"4202179","name":"Bluffdale Pit"},"validFrom":"1950-01-01","validTo":"2011-03-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4202179|M01655|1950-01-01|2011-03-31"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L15364","name":"Asphalt Materials"},"object":{"type":"mine","id":"4202179","name":"Bluffdale Pit"},"validFrom":"1997-06-01","validTo":"2023-02-02","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4202179|L15364|1997-06-01|2023-02-02"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M11722","name":"Harvey  Hansen"},"object":{"type":"mine","id":"4202179","name":"Bluffdale Pit"},"validFrom":"1997-06-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4202179|M11722|1997-06-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M11722","name":"Harvey  Hansen"},"object":{"type":"operator","id":"L15364","name":"Asphalt Materials"},"validFrom":"1997-06-01","validTo":"2023-02-02","current":false,"derived":true,"evidenceMineId":"4202179","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4202179|L15364|1997-06-01|M11722|1997-06-01|152118"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M02046","name":"Summit Materials LLC"},"object":{"type":"mine","id":"4202179","name":"Bluffdale Pit"},"validFrom":"2011-04-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4202179|M02046|2011-04-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L01838","name":"Kilgore Contracting"},"object":{"type":"mine","id":"4202179","name":"Bluffdale Pit"},"validFrom":"2023-02-03","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4202179|L01838|2023-02-03|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M01655","name":"Harold  Elam"},"object":{"type":"operator","id":"L01838","name":"Kilgore Contracting"},"validFrom":"2023-02-03","validTo":"2011-03-31","current":false,"derived":true,"evidenceMineId":"4202179","intervalAnomaly":true,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4202179|L01838|2023-02-03|M01655|1950-01-01|120102"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M02046","name":"Summit Materials LLC"},"object":{"type":"operator","id":"L01838","name":"Kilgore Contracting"},"validFrom":"2023-02-03","validTo":null,"current":true,"derived":true,"evidenceMineId":"4202179","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4202179|L01838|2023-02-03|M02046|2011-04-01|122898"}}],"coverage":{"historyRecords":3,"edgeCount":8,"intervalAnomalies":1,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4202179","dataSource":"postgres","snapshotId":"2026-10-13T11:19:05.459773+00:00","completedAt":"2026-10-13T11:26:59.401Z","sourceCount":20,"totalRows":17906804,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}