{"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":"3304338","name":"Guernsey Strip"},"operator":{"type":"operator","id":"P16978","name":"Oxford Mining"},"controller":{"type":"controller","id":"C01550","name":"Westmoreland Coal Company"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C00707","name":"Holmes Limestone"},"object":{"type":"mine","id":"3304338","name":"Guernsey Strip"},"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":"3304338|C00707|1950-01-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C04381","name":"Charles C  Ungurean"},"object":{"type":"mine","id":"3304338","name":"Guernsey Strip"},"validFrom":"1950-01-01","validTo":"2014-12-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3304338|C04381|1950-01-01|2014-12-31"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P00830","name":"Holmes Limestone Co."},"object":{"type":"mine","id":"3304338","name":"Guernsey Strip"},"validFrom":"1994-08-01","validTo":"2003-01-29","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3304338|P00830|1994-08-01|2003-01-29"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C00707","name":"Holmes Limestone"},"object":{"type":"operator","id":"P00830","name":"Holmes Limestone Co."},"validFrom":"1994-08-01","validTo":"2003-01-29","current":false,"derived":true,"evidenceMineId":"3304338","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3304338|P00830|1994-08-01|C00707|1950-01-01|49520"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P16978","name":"Oxford Mining"},"object":{"type":"mine","id":"3304338","name":"Guernsey Strip"},"validFrom":"2003-01-30","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3304338|P16978|2003-01-30|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C04381","name":"Charles C  Ungurean"},"object":{"type":"operator","id":"P16978","name":"Oxford Mining"},"validFrom":"2003-01-30","validTo":"2014-12-31","current":false,"derived":true,"evidenceMineId":"3304338","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3304338|P16978|2003-01-30|C04381|1950-01-01|65793"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C01550","name":"Westmoreland Coal Company"},"object":{"type":"mine","id":"3304338","name":"Guernsey Strip"},"validFrom":"2015-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3304338|C01550|2015-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C01550","name":"Westmoreland Coal Company"},"object":{"type":"operator","id":"P16978","name":"Oxford Mining"},"validFrom":"2015-01-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"3304338","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3304338|P16978|2003-01-30|C01550|2015-01-01|54905"}}],"coverage":{"historyRecords":3,"edgeCount":8,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"3304338","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"}}