{"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":"1518671","name":"Town Creek Mine"},"operator":{"type":"operator","id":"0073363","name":"Vulcan Highwall Mining, LLC"},"controller":{"type":"controller","id":"0061409","name":"Ford F  Graham; Kevin C  Davis"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"0051514","name":"Nexgen Highwall Mining Services, LLC"},"object":{"type":"mine","id":"1518671","name":"Town Creek Mine"},"validFrom":"2003-09-17","validTo":"2006-05-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1518671|0051514|2003-09-17|2006-05-31"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0042091","name":"Charles S  McNeil"},"object":{"type":"mine","id":"1518671","name":"Town Creek Mine"},"validFrom":"2003-09-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1518671|0042091|2003-09-17|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0042091","name":"Charles S  McNeil"},"object":{"type":"operator","id":"0051514","name":"Nexgen Highwall Mining Services, LLC"},"validFrom":"2003-09-17","validTo":"2006-05-31","current":false,"derived":true,"evidenceMineId":"1518671","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1518671|0051514|2003-09-17|0042091|2003-09-17|3662"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0073363","name":"Vulcan Highwall Mining, LLC"},"object":{"type":"mine","id":"1518671","name":"Town Creek Mine"},"validFrom":"2006-06-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1518671|0073363|2006-06-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0061409","name":"Kevin C  Davis et al"},"object":{"type":"mine","id":"1518671","name":"Town Creek Mine"},"validFrom":"2006-06-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1518671|0061409|2006-06-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0061409","name":"Kevin C  Davis et al"},"object":{"type":"operator","id":"0073363","name":"Vulcan Highwall Mining, LLC"},"validFrom":"2006-06-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"1518671","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1518671|0073363|2006-06-01|0061409|2006-06-01|8214"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0061409","name":"Ford F  Graham et al"},"object":{"type":"operator","id":"0073363","name":"Vulcan Highwall Mining, LLC"},"validFrom":"2006-06-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"1518671","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1518671|0073363|2006-06-01|0061409|2006-06-01|8215"}}],"coverage":{"historyRecords":3,"edgeCount":7,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1518671","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"}}