{"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":"1515396","name":"No 1 Surface"},"operator":{"type":"operator","id":"P21081","name":"Crown Royal Mining Inc"},"controller":{"type":"controller","id":"C11343","name":"Rex  Fought"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"P17229","name":"Elkhorn Construction Company Inc"},"object":{"type":"mine","id":"1515396","name":"No 1 Surface"},"validFrom":"1985-10-01","validTo":"1988-04-04","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515396|P17229|1985-10-01|1988-04-04"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C00881","name":"Epling Walter Ben & Michael R"},"object":{"type":"mine","id":"1515396","name":"No 1 Surface"},"validFrom":"1985-10-01","validTo":"1992-02-10","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515396|C00881|1985-10-01|1992-02-10"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C00881","name":"Epling Walter Ben & Michael R"},"object":{"type":"operator","id":"P17229","name":"Elkhorn Construction Company Inc"},"validFrom":"1985-10-01","validTo":"1988-04-04","current":false,"derived":true,"evidenceMineId":"1515396","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515396|P17229|1985-10-01|C00881|1985-10-01|50829"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P19419","name":"Liberty Coal Company Inc"},"object":{"type":"mine","id":"1515396","name":"No 1 Surface"},"validFrom":"1988-04-05","validTo":"1989-05-24","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515396|P19419|1988-04-05|1989-05-24"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C11959","name":"J D McDonald et al"},"object":{"type":"mine","id":"1515396","name":"No 1 Surface"},"validFrom":"1988-04-05","validTo":"1989-05-24","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515396|C11959|1988-04-05|1989-05-24"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C11959","name":"J D McDonald et al"},"object":{"type":"operator","id":"P19419","name":"Liberty Coal Company Inc"},"validFrom":"1988-04-05","validTo":"1989-05-24","current":false,"derived":true,"evidenceMineId":"1515396","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515396|P19419|1988-04-05|C11959|1988-04-05|85797"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P20267","name":"Crown Royal Mining Inc"},"object":{"type":"mine","id":"1515396","name":"No 1 Surface"},"validFrom":"1989-05-25","validTo":"1990-08-07","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515396|P20267|1989-05-25|1990-08-07"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C13821","name":"Cruey Edgar"},"object":{"type":"mine","id":"1515396","name":"No 1 Surface"},"validFrom":"1989-05-25","validTo":"1990-08-07","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515396|C13821|1989-05-25|1990-08-07"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C13821","name":"Cruey Edgar"},"object":{"type":"operator","id":"P20267","name":"Crown Royal Mining Inc"},"validFrom":"1989-05-25","validTo":"1990-08-07","current":false,"derived":true,"evidenceMineId":"1515396","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515396|P20267|1989-05-25|C13821|1989-05-25|91244"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P21081","name":"Crown Royal Mining Inc"},"object":{"type":"mine","id":"1515396","name":"No 1 Surface"},"validFrom":"1990-08-08","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515396|P21081|1990-08-08|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C11343","name":"Rex  Fought"},"object":{"type":"mine","id":"1515396","name":"No 1 Surface"},"validFrom":"1990-08-08","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515396|C11343|1990-08-08|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C11343","name":"Rex  Fought"},"object":{"type":"operator","id":"P21081","name":"Crown Royal Mining Inc"},"validFrom":"1990-08-08","validTo":null,"current":true,"derived":true,"evidenceMineId":"1515396","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515396|P21081|1990-08-08|C11343|1990-08-08|84388"}}],"coverage":{"historyRecords":4,"edgeCount":12,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1515396","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"}}