{"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":"1600971","name":"Hatcher Pit"},"operator":{"type":"operator","id":"L05410","name":"Industrial Gravel Company Inc"},"controller":{"type":"controller","id":"M04370","name":"Bobby G  Johnson"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L05409","name":"Industrial Gravel Inc"},"object":{"type":"mine","id":"1600971","name":"Hatcher Pit"},"validFrom":"1979-12-01","validTo":"1981-07-26","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1600971|L05409|1979-12-01|1981-07-26"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M04369","name":"Pipes Randolph"},"object":{"type":"mine","id":"1600971","name":"Hatcher Pit"},"validFrom":"1979-12-01","validTo":"1981-07-26","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1600971|M04369|1979-12-01|1981-07-26"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M04369","name":"Pipes Randolph"},"object":{"type":"operator","id":"L05409","name":"Industrial Gravel Inc"},"validFrom":"1979-12-01","validTo":"1981-07-26","current":false,"derived":true,"evidenceMineId":"1600971","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1600971|L05409|1979-12-01|M04369|1979-12-01|131836"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L05410","name":"Industrial Gravel Company Inc"},"object":{"type":"mine","id":"1600971","name":"Hatcher Pit"},"validFrom":"1981-07-27","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1600971|L05410|1981-07-27|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M04370","name":"Bobby G  Johnson"},"object":{"type":"mine","id":"1600971","name":"Hatcher Pit"},"validFrom":"1981-07-27","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1600971|M04370|1981-07-27|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M04370","name":"Bobby G  Johnson"},"object":{"type":"operator","id":"L05410","name":"Industrial Gravel Company Inc"},"validFrom":"1981-07-27","validTo":null,"current":true,"derived":true,"evidenceMineId":"1600971","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1600971|L05410|1981-07-27|M04370|1981-07-27|131838"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1600971","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"}}