{"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":"1518155","name":"Ohio Valley Gravel & Sand"},"operator":{"type":"operator","id":"0084705","name":"Four Rivers Contracting Inc"},"controller":{"type":"controller","id":"0044403","name":"Rex  Smith"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-18T09:31:49.615908+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L16432","name":"H & G Construction Company Inc"},"object":{"type":"mine","id":"1518155","name":"Ohio Valley Gravel & Sand"},"validFrom":"1999-03-01","validTo":"2007-09-26","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1518155|L16432|1999-03-01|2007-09-26"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M12571","name":"Pat A  Holsapple  et al"},"object":{"type":"mine","id":"1518155","name":"Ohio Valley Gravel & Sand"},"validFrom":"1999-03-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1518155|M12571|1999-03-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M12571","name":"Pat A  Holsapple  et al"},"object":{"type":"operator","id":"L16432","name":"H & G Construction Company Inc"},"validFrom":"1999-03-01","validTo":"2007-09-26","current":false,"derived":true,"evidenceMineId":"1518155","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1518155|L16432|1999-03-01|M12571|1999-03-01|154095"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0084705","name":"Four Rivers Contracting Inc"},"object":{"type":"mine","id":"1518155","name":"Ohio Valley Gravel & Sand"},"validFrom":"2007-09-27","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1518155|0084705|2007-09-27|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0044403","name":"Rex  Smith"},"object":{"type":"mine","id":"1518155","name":"Ohio Valley Gravel & Sand"},"validFrom":"2007-09-27","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1518155|0044403|2007-09-27|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0044403","name":"Rex  Smith"},"object":{"type":"operator","id":"0084705","name":"Four Rivers Contracting Inc"},"validFrom":"2007-09-27","validTo":null,"current":true,"derived":true,"evidenceMineId":"1518155","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1518155|0084705|2007-09-27|0044403|2007-09-27|5041"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1518155","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"}}