{"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":"1800776","name":"Walker Mine"},"operator":{"type":"operator","id":"0094965","name":"Heritage Coal & Natural Resources, LLC"},"controller":{"type":"controller","id":"0182320","name":"KTRV LLC"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"0078864","name":"Walker Brothers Mining, Inc."},"object":{"type":"mine","id":"1800776","name":"Walker Mine"},"validFrom":"2007-03-07","validTo":"2019-02-10","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0078864|2007-03-07|2019-02-10"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0066291","name":"George K  Walker"},"object":{"type":"mine","id":"1800776","name":"Walker Mine"},"validFrom":"2007-03-07","validTo":"2013-08-29","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0066291|2007-03-07|2013-08-29"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0066291","name":"George K  Walker"},"object":{"type":"operator","id":"0078864","name":"Walker Brothers Mining, Inc."},"validFrom":"2007-03-07","validTo":"2013-08-29","current":false,"derived":true,"evidenceMineId":"1800776","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0078864|2007-03-07|0066291|2007-03-07|9189"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0040547","name":"Jody L  Ritchie"},"object":{"type":"mine","id":"1800776","name":"Walker Mine"},"validFrom":"2007-11-30","validTo":"2022-03-15","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0040547|2007-11-30|2022-03-15"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0079953","name":"Angela  Svonavec"},"object":{"type":"mine","id":"1800776","name":"Walker Mine"},"validFrom":"2008-09-03","validTo":"2024-02-04","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0079953|2008-09-03|2024-02-04"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0110683","name":"Samuel  Walker"},"object":{"type":"mine","id":"1800776","name":"Walker Mine"},"validFrom":"2013-08-30","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0110683|2013-08-30|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0110683","name":"Samuel  Walker"},"object":{"type":"operator","id":"0078864","name":"Walker Brothers Mining, Inc."},"validFrom":"2013-08-30","validTo":"2019-02-10","current":false,"derived":true,"evidenceMineId":"1800776","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0078864|2007-03-07|0110683|2013-08-30|20285"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0085026","name":"Beechwood Coal, LLC"},"object":{"type":"mine","id":"1800776","name":"Walker Mine"},"validFrom":"2019-02-11","validTo":"2021-07-13","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0085026|2019-02-11|2021-07-13"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0040547","name":"Jody L  Ritchie"},"object":{"type":"operator","id":"0085026","name":"Beechwood Coal, LLC"},"validFrom":"2019-02-11","validTo":"2021-07-13","current":false,"derived":true,"evidenceMineId":"1800776","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0085026|2019-02-11|0040547|2007-11-30|199"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0094965","name":"Heritage Coal & Natural Resources, LLC"},"object":{"type":"mine","id":"1800776","name":"Walker Mine"},"validFrom":"2021-07-14","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0094965|2021-07-14|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0079953","name":"Angela  Svonavec"},"object":{"type":"operator","id":"0094965","name":"Heritage Coal & Natural Resources, LLC"},"validFrom":"2021-07-14","validTo":"2024-02-04","current":false,"derived":true,"evidenceMineId":"1800776","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0094965|2021-07-14|0079953|2008-09-03|12559"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0167620","name":"Jody L Ritchie et al"},"object":{"type":"mine","id":"1800776","name":"Walker Mine"},"validFrom":"2022-03-16","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0167620|2022-03-16|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0167620","name":"Jody L Ritchie et al"},"object":{"type":"operator","id":"0085026","name":"Beechwood Coal, LLC"},"validFrom":"2022-03-16","validTo":"2021-07-13","current":false,"derived":true,"evidenceMineId":"1800776","intervalAnomaly":true,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0085026|2019-02-11|0167620|2022-03-16|35319"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0167620","name":"Faith  Ritchie et al"},"object":{"type":"operator","id":"0085026","name":"Beechwood Coal, LLC"},"validFrom":"2022-03-16","validTo":"2021-07-13","current":false,"derived":true,"evidenceMineId":"1800776","intervalAnomaly":true,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0085026|2019-02-11|0167620|2022-03-16|35320"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0182320","name":"KTRV LLC"},"object":{"type":"mine","id":"1800776","name":"Walker Mine"},"validFrom":"2024-02-05","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0182320|2024-02-05|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0182320","name":"KTRV LLC"},"object":{"type":"operator","id":"0094965","name":"Heritage Coal & Natural Resources, LLC"},"validFrom":"2024-02-05","validTo":null,"current":true,"derived":true,"evidenceMineId":"1800776","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1800776|0094965|2021-07-14|0182320|2024-02-05|38917"}}],"coverage":{"historyRecords":7,"edgeCount":16,"intervalAnomalies":2,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1800776","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"}}