{"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":"1515286","name":"No 1"},"operator":{"type":"operator","id":"P18112","name":"Thunderbird Mining Inc"},"controller":{"type":"controller","id":"C12652","name":"Hamilton Gary D"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"P16857","name":"Tuscoal Coal Company Inc"},"object":{"type":"mine","id":"1515286","name":"No 1"},"validFrom":"1985-07-01","validTo":"1986-02-23","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515286|P16857|1985-07-01|1986-02-23"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C10312","name":"Tussey Frank"},"object":{"type":"mine","id":"1515286","name":"No 1"},"validFrom":"1985-07-01","validTo":"1988-03-09","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515286|C10312|1985-07-01|1988-03-09"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C10312","name":"Tussey Frank"},"object":{"type":"operator","id":"P16857","name":"Tuscoal Coal Company Inc"},"validFrom":"1985-07-01","validTo":"1986-02-23","current":false,"derived":true,"evidenceMineId":"1515286","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515286|P16857|1985-07-01|C10312|1985-07-01|81739"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P17918","name":"L & B Mining"},"object":{"type":"mine","id":"1515286","name":"No 1"},"validFrom":"1986-02-24","validTo":"1986-09-16","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515286|P17918|1986-02-24|1986-09-16"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C12547","name":"Mitchell Lowell"},"object":{"type":"mine","id":"1515286","name":"No 1"},"validFrom":"1986-02-24","validTo":"1986-09-16","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515286|C12547|1986-02-24|1986-09-16"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C12547","name":"Mitchell Lowell"},"object":{"type":"operator","id":"P17918","name":"L & B Mining"},"validFrom":"1986-02-24","validTo":"1986-09-16","current":false,"derived":true,"evidenceMineId":"1515286","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515286|P17918|1986-02-24|C12547|1986-02-24|87345"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P18112","name":"Thunderbird Mining Inc"},"object":{"type":"mine","id":"1515286","name":"No 1"},"validFrom":"1986-09-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515286|P18112|1986-09-17|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C12652","name":"Hamilton Gary D"},"object":{"type":"mine","id":"1515286","name":"No 1"},"validFrom":"1986-09-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515286|C12652|1986-09-17|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C12652","name":"Hamilton Gary D"},"object":{"type":"operator","id":"P18112","name":"Thunderbird Mining Inc"},"validFrom":"1986-09-17","validTo":null,"current":true,"derived":true,"evidenceMineId":"1515286","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515286|P18112|1986-09-17|C12652|1986-09-17|87592"}}],"coverage":{"historyRecords":3,"edgeCount":9,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1515286","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"}}