{"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":"2026-10-18T09:31:49.615908+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":"0202791","name":"Rio Grande Material"},"operator":{"type":"operator","id":"0061663","name":"Damavand Trading LLC"},"controller":{"type":"controller","id":"0051489","name":"Julie A Chaffin"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-18T09:31:49.615908+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M30207","name":"Woodrow J  Whitehurst et al"},"object":{"type":"mine","id":"0202791","name":"Rio Grande Material"},"validFrom":"1983-09-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0202791|M30207|1983-09-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L30207","name":"Ajax Contracting Company Inc"},"object":{"type":"mine","id":"0202791","name":"Rio Grande Material"},"validFrom":"1998-10-01","validTo":"2005-04-25","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0202791|L30207|1998-10-01|2005-04-25"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M30207","name":"Woodrow J  Whitehurst et al"},"object":{"type":"operator","id":"L30207","name":"Ajax Contracting Company Inc"},"validFrom":"1998-10-01","validTo":"2005-04-25","current":false,"derived":true,"evidenceMineId":"0202791","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0202791|L30207|1998-10-01|M30207|1983-09-01|158321"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M30207","name":"Joseph F  Guinn et al"},"object":{"type":"operator","id":"L30207","name":"Ajax Contracting Company Inc"},"validFrom":"1998-10-01","validTo":"2005-04-25","current":false,"derived":true,"evidenceMineId":"0202791","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0202791|L30207|1998-10-01|M30207|1983-09-01|158322"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0061663","name":"Damavand Trading LLC"},"object":{"type":"mine","id":"0202791","name":"Rio Grande Material"},"validFrom":"2005-04-26","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0202791|0061663|2005-04-26|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0051489","name":"Julie A Chaffin et al"},"object":{"type":"mine","id":"0202791","name":"Rio Grande Material"},"validFrom":"2005-04-26","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0202791|0051489|2005-04-26|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0051489","name":"Julie A Chaffin et al"},"object":{"type":"operator","id":"0061663","name":"Damavand Trading LLC"},"validFrom":"2005-04-26","validTo":null,"current":true,"derived":true,"evidenceMineId":"0202791","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0202791|0061663|2005-04-26|0051489|2005-04-26|6470"}}],"coverage":{"historyRecords":3,"edgeCount":7,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0202791","dataSource":"postgres","snapshotId":"2026-10-18T09:31:49.615908+00:00","completedAt":"2026-10-18T09:31:49.615Z","sourceCount":20,"totalRows":17915666,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}