{"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":"4603430","name":"Lower Big Branch Impoundment"},"operator":{"type":"operator","id":"0154153","name":"Lexington Coal Company, LLC"},"controller":{"type":"controller","id":"0137221","name":"Lexington Coal Holdings, Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"P02313","name":"Armco Inc"},"object":{"type":"mine","id":"4603430","name":"Lower Big Branch Impoundment"},"validFrom":"1950-01-01","validTo":"1984-02-26","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|P02313|1950-01-01|1984-02-26"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C01978","name":"Armco Inc"},"object":{"type":"mine","id":"4603430","name":"Lower Big Branch Impoundment"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|C01978|1950-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C01978","name":"Armco Inc"},"object":{"type":"operator","id":"P02313","name":"Armco Inc"},"validFrom":"1950-01-01","validTo":"1984-02-26","current":false,"derived":true,"evidenceMineId":"4603430","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|P02313|1950-01-01|C01978|1950-01-01|56987"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C05313","name":"Hanson PLC"},"object":{"type":"mine","id":"4603430","name":"Lower Big Branch Impoundment"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|C05313|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P06396","name":"Peabody Coal Company"},"object":{"type":"mine","id":"4603430","name":"Lower Big Branch Impoundment"},"validFrom":"1984-02-27","validTo":"1994-10-14","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|P06396|1984-02-27|1994-10-14"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C05313","name":"Hanson PLC"},"object":{"type":"operator","id":"P06396","name":"Peabody Coal Company"},"validFrom":"1984-02-27","validTo":"1994-10-14","current":false,"derived":true,"evidenceMineId":"4603430","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|P06396|1984-02-27|C05313|1950-01-01|68283"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P22901","name":"Performance Coal Company, LLC"},"object":{"type":"mine","id":"4603430","name":"Lower Big Branch Impoundment"},"validFrom":"1994-10-15","validTo":"2017-10-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|P22901|1994-10-15|2017-10-22"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C02508","name":"Massey Energy Company"},"object":{"type":"mine","id":"4603430","name":"Lower Big Branch Impoundment"},"validFrom":"1994-10-15","validTo":"2011-05-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|C02508|1994-10-15|2011-05-31"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C02508","name":"Massey Energy Company"},"object":{"type":"operator","id":"P22901","name":"Performance Coal Company, LLC"},"validFrom":"1994-10-15","validTo":"2011-05-31","current":false,"derived":true,"evidenceMineId":"4603430","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|P22901|1994-10-15|C02508|1994-10-15|59387"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0041211","name":"Alpha Natural Resources, Inc."},"object":{"type":"mine","id":"4603430","name":"Lower Big Branch Impoundment"},"validFrom":"2011-06-01","validTo":"2016-07-25","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|0041211|2011-06-01|2016-07-25"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0041211","name":"Alpha Natural Resources, Inc."},"object":{"type":"operator","id":"P22901","name":"Performance Coal Company, LLC"},"validFrom":"2011-06-01","validTo":"2016-07-25","current":false,"derived":true,"evidenceMineId":"4603430","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|P22901|1994-10-15|0041211|2011-06-01|1964"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0127923","name":"Alpha Natural Resources Holdings, Inc"},"object":{"type":"mine","id":"4603430","name":"Lower Big Branch Impoundment"},"validFrom":"2016-07-26","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|0127923|2016-07-26|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0127923","name":"Alpha Natural Resources Holdings, Inc"},"object":{"type":"operator","id":"P22901","name":"Performance Coal Company, LLC"},"validFrom":"2016-07-26","validTo":"2017-10-22","current":false,"derived":true,"evidenceMineId":"4603430","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|P22901|1994-10-15|0127923|2016-07-26|25507"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0154153","name":"Lexington Coal Company, LLC"},"object":{"type":"mine","id":"4603430","name":"Lower Big Branch Impoundment"},"validFrom":"2017-10-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|0154153|2017-10-23|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0137221","name":"Lexington Coal Holdings, Inc"},"object":{"type":"mine","id":"4603430","name":"Lower Big Branch Impoundment"},"validFrom":"2017-10-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|0137221|2017-10-23|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0137221","name":"Lexington Coal Holdings, Inc"},"object":{"type":"operator","id":"0154153","name":"Lexington Coal Company, LLC"},"validFrom":"2017-10-23","validTo":null,"current":true,"derived":true,"evidenceMineId":"4603430","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4603430|0154153|2017-10-23|0137221|2017-10-23|27678"}}],"coverage":{"historyRecords":6,"edgeCount":16,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4603430","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"}}