{"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":"1516859","name":"Campbell #1"},"operator":{"type":"operator","id":"P12350","name":"Ruby Coal Company"},"controller":{"type":"controller","id":"C09141","name":"Wendell  Elza"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C09141","name":"Wendell  Elza"},"object":{"type":"mine","id":"1516859","name":"Campbell #1"},"validFrom":"1981-04-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516859|C09141|1981-04-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P20880","name":"D & H Coal Of Laurel County Inc"},"object":{"type":"mine","id":"1516859","name":"Campbell #1"},"validFrom":"1990-04-01","validTo":"1992-11-23","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516859|P20880|1990-04-01|1992-11-23"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C03622","name":"Darrell  Davis"},"object":{"type":"mine","id":"1516859","name":"Campbell #1"},"validFrom":"1990-04-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516859|C03622|1990-04-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C03622","name":"Darrell  Davis"},"object":{"type":"operator","id":"P20880","name":"D & H Coal Of Laurel County Inc"},"validFrom":"1990-04-01","validTo":"1992-11-23","current":false,"derived":true,"evidenceMineId":"1516859","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516859|P20880|1990-04-01|C03622|1990-04-01|63386"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P12350","name":"Ruby Coal Company"},"object":{"type":"mine","id":"1516859","name":"Campbell #1"},"validFrom":"1992-11-24","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516859|P12350|1992-11-24|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C09141","name":"Wendell  Elza"},"object":{"type":"operator","id":"P12350","name":"Ruby Coal Company"},"validFrom":"1992-11-24","validTo":null,"current":true,"derived":true,"evidenceMineId":"1516859","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516859|P12350|1992-11-24|C09141|1981-04-01|78955"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1516859","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"}}