{"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":"4001852","name":"Piedmont No 1"},"operator":{"type":"operator","id":"P03262","name":"Piedmont Mining Company Inc"},"controller":{"type":"controller","id":"C01082","name":"Chambers James F"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"P03262","name":"Piedmont Mining Company Inc"},"object":{"type":"mine","id":"4001852","name":"Piedmont No 1"},"validFrom":"1975-12-29","validTo":"1977-05-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4001852|P03262|1975-12-29|1977-05-31"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C01082","name":"Chambers James F"},"object":{"type":"mine","id":"4001852","name":"Piedmont No 1"},"validFrom":"1975-12-29","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4001852|C01082|1975-12-29|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C01082","name":"Chambers James F"},"object":{"type":"operator","id":"P03262","name":"Piedmont Mining Company Inc"},"validFrom":"1975-12-29","validTo":"1977-05-31","current":false,"derived":true,"evidenceMineId":"4001852","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4001852|P03262|1975-12-29|C01082|1975-12-29|52161"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P06602","name":"Nunley & Layne Coal Company"},"object":{"type":"mine","id":"4001852","name":"Piedmont No 1"},"validFrom":"1977-06-01","validTo":"1978-04-09","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4001852|P06602|1977-06-01|1978-04-09"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C04729","name":"Nunley James E & L Layne"},"object":{"type":"mine","id":"4001852","name":"Piedmont No 1"},"validFrom":"1977-06-01","validTo":"1978-04-09","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4001852|C04729|1977-06-01|1978-04-09"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C04729","name":"Nunley James E & L Layne"},"object":{"type":"operator","id":"P06602","name":"Nunley & Layne Coal Company"},"validFrom":"1977-06-01","validTo":"1978-04-09","current":false,"derived":true,"evidenceMineId":"4001852","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4001852|P06602|1977-06-01|C04729|1977-06-01|66588"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P03262","name":"Piedmont Mining Company Inc"},"object":{"type":"mine","id":"4001852","name":"Piedmont No 1"},"validFrom":"1978-04-10","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4001852|P03262|1978-04-10|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C01082","name":"Chambers James F"},"object":{"type":"operator","id":"P03262","name":"Piedmont Mining Company Inc"},"validFrom":"1978-04-10","validTo":null,"current":true,"derived":true,"evidenceMineId":"4001852","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4001852|P03262|1978-04-10|C01082|1975-12-29|52162"}}],"coverage":{"historyRecords":3,"edgeCount":8,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4001852","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"}}