{"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":"2902201","name":"San Juan Deep"},"operator":{"type":"operator","id":"P15965","name":"San Juan Coal Company"},"controller":{"type":"controller","id":"0146581","name":"Westmoreland Mining Holdings LLC"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C11406","name":"BHP Billiton"},"object":{"type":"mine","id":"2902201","name":"San Juan Deep"},"validFrom":"1984-04-02","validTo":"2016-01-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2902201|C11406|1984-04-02|2016-01-31"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P15965","name":"San Juan Coal Company"},"object":{"type":"mine","id":"2902201","name":"San Juan Deep"},"validFrom":"2000-04-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2902201|P15965|2000-04-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C11406","name":"BHP Billiton"},"object":{"type":"operator","id":"P15965","name":"San Juan Coal Company"},"validFrom":"2000-04-01","validTo":"2016-01-31","current":false,"derived":true,"evidenceMineId":"2902201","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2902201|P15965|2000-04-01|C11406|1984-04-02|84505"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C01550","name":"Westmoreland Coal Company"},"object":{"type":"mine","id":"2902201","name":"San Juan Deep"},"validFrom":"2016-02-01","validTo":"2019-03-14","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2902201|C01550|2016-02-01|2019-03-14"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C01550","name":"Westmoreland Coal Company"},"object":{"type":"operator","id":"P15965","name":"San Juan Coal Company"},"validFrom":"2016-02-01","validTo":"2019-03-14","current":false,"derived":true,"evidenceMineId":"2902201","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2902201|P15965|2000-04-01|C01550|2016-02-01|54936"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0146581","name":"Westmoreland Mining Holdings LLC"},"object":{"type":"mine","id":"2902201","name":"San Juan Deep"},"validFrom":"2019-03-15","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2902201|0146581|2019-03-15|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0146581","name":"Westmoreland Mining Holdings LLC"},"object":{"type":"operator","id":"P15965","name":"San Juan Coal Company"},"validFrom":"2019-03-15","validTo":null,"current":true,"derived":true,"evidenceMineId":"2902201","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2902201|P15965|2000-04-01|0146581|2019-03-15|30009"}}],"coverage":{"historyRecords":3,"edgeCount":7,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"2902201","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"}}