{"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":"4602265","name":"Rockcamp Impoundments 1 & 2"},"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":"P01294","name":"Peerless Eagle Coal Company"},"object":{"type":"mine","id":"4602265","name":"Rockcamp Impoundments 1 & 2"},"validFrom":"1950-01-01","validTo":"1975-08-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4602265|P01294|1950-01-01|1975-08-31"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C02369","name":"Terry  Seelinger et al"},"object":{"type":"mine","id":"4602265","name":"Rockcamp Impoundments 1 & 2"},"validFrom":"1950-01-01","validTo":"1975-08-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4602265|C02369|1950-01-01|1975-08-31"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C02369","name":"Terry  Seelinger et al"},"object":{"type":"operator","id":"P01294","name":"Peerless Eagle Coal Company"},"validFrom":"1950-01-01","validTo":"1975-08-31","current":false,"derived":true,"evidenceMineId":"4602265","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4602265|P01294|1950-01-01|C02369|1950-01-01|58235"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P06978","name":"Peerless Eagle Coal Company, LLC"},"object":{"type":"mine","id":"4602265","name":"Rockcamp Impoundments 1 & 2"},"validFrom":"1975-09-01","validTo":"2017-10-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4602265|P06978|1975-09-01|2017-10-22"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C02508","name":"Massey Energy Company"},"object":{"type":"mine","id":"4602265","name":"Rockcamp Impoundments 1 & 2"},"validFrom":"1975-09-01","validTo":"2011-05-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4602265|C02508|1975-09-01|2011-05-31"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C02508","name":"Massey Energy Company"},"object":{"type":"operator","id":"P06978","name":"Peerless Eagle Coal Company, LLC"},"validFrom":"1975-09-01","validTo":"2011-05-31","current":false,"derived":true,"evidenceMineId":"4602265","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4602265|P06978|1975-09-01|C02508|1975-09-01|59051"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0041211","name":"Alpha Natural Resources, Inc."},"object":{"type":"mine","id":"4602265","name":"Rockcamp Impoundments 1 & 2"},"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":"4602265|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":"P06978","name":"Peerless Eagle Coal Company, LLC"},"validFrom":"2011-06-01","validTo":"2016-07-25","current":false,"derived":true,"evidenceMineId":"4602265","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4602265|P06978|1975-09-01|0041211|2011-06-01|1948"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0127923","name":"Alpha Natural Resources Holdings, Inc"},"object":{"type":"mine","id":"4602265","name":"Rockcamp Impoundments 1 & 2"},"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":"4602265|0127923|2016-07-26|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0127923","name":"Alpha Natural Resources Holdings, Inc"},"object":{"type":"operator","id":"P06978","name":"Peerless Eagle Coal Company, LLC"},"validFrom":"2016-07-26","validTo":"2017-10-22","current":false,"derived":true,"evidenceMineId":"4602265","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4602265|P06978|1975-09-01|0127923|2016-07-26|25492"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0154153","name":"Lexington Coal Company, LLC"},"object":{"type":"mine","id":"4602265","name":"Rockcamp Impoundments 1 & 2"},"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":"4602265|0154153|2017-10-23|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0137221","name":"Lexington Coal Holdings, Inc"},"object":{"type":"mine","id":"4602265","name":"Rockcamp Impoundments 1 & 2"},"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":"4602265|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":"4602265","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4602265|0154153|2017-10-23|0137221|2017-10-23|27673"}}],"coverage":{"historyRecords":5,"edgeCount":13,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4602265","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"}}