{"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":"2026-10-17T05:35:58.500035+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":"1519615","name":"MCC ADDCAR HWM System 23"},"operator":{"type":"operator","id":"P00908","name":"Martin County Coal Corp"},"controller":{"type":"controller","id":"0127923","name":"Alpha Natural Resources Holdings, Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C02508","name":"Massey Energy Company"},"object":{"type":"mine","id":"1519615","name":"MCC ADDCAR HWM System 23"},"validFrom":"1975-05-28","validTo":"2011-05-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1519615|C02508|1975-05-28|2011-05-31"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0041211","name":"Alpha Natural Resources, Inc."},"object":{"type":"mine","id":"1519615","name":"MCC ADDCAR HWM System 23"},"validFrom":"2011-06-01","validTo":"2016-07-25","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1519615|0041211|2011-06-01|2016-07-25"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P00908","name":"Martin County Coal Corp"},"object":{"type":"mine","id":"1519615","name":"MCC ADDCAR HWM System 23"},"validFrom":"2011-08-10","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1519615|P00908|2011-08-10|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0041211","name":"Alpha Natural Resources, Inc."},"object":{"type":"operator","id":"P00908","name":"Martin County Coal Corp"},"validFrom":"2011-08-10","validTo":"2016-07-25","current":false,"derived":true,"evidenceMineId":"1519615","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1519615|P00908|2011-08-10|0041211|2011-06-01|1910"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C02508","name":"Massey Energy Company"},"object":{"type":"operator","id":"P00908","name":"Martin County Coal Corp"},"validFrom":"2011-08-10","validTo":"2011-05-31","current":false,"derived":true,"evidenceMineId":"1519615","intervalAnomaly":true,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1519615|P00908|2011-08-10|C02508|1975-05-28|59064"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0127923","name":"Alpha Natural Resources Holdings, Inc"},"object":{"type":"mine","id":"1519615","name":"MCC ADDCAR HWM System 23"},"validFrom":"2016-07-26","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1519615|0127923|2016-07-26|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0127923","name":"Alpha Natural Resources Holdings, Inc"},"object":{"type":"operator","id":"P00908","name":"Martin County Coal Corp"},"validFrom":"2016-07-26","validTo":null,"current":true,"derived":true,"evidenceMineId":"1519615","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1519615|P00908|2011-08-10|0127923|2016-07-26|25457"}}],"coverage":{"historyRecords":3,"edgeCount":7,"intervalAnomalies":1,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1519615","dataSource":"postgres","snapshotId":"2026-10-17T05:35:58.500035+00:00","completedAt":"2026-10-17T06:17:15.228Z","sourceCount":20,"totalRows":15450873,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}