{"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":"2501231","name":"West Center Sand"},"operator":{"type":"operator","id":"L16197","name":"Martin Marietta Materials, Inc."},"controller":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"mine","id":"2501231","name":"West Center Sand"},"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":"2501231|M00174|1950-01-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00146","name":"Don  Rogert"},"object":{"type":"mine","id":"2501231","name":"West Center Sand"},"validFrom":"1993-08-13","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2501231|M00146|1993-08-13|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L13299","name":"Mallard Sand & Gravel Co."},"object":{"type":"mine","id":"2501231","name":"West Center Sand"},"validFrom":"2007-03-22","validTo":"2008-12-03","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2501231|L13299|2007-03-22|2008-12-03"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00146","name":"Don  Rogert"},"object":{"type":"operator","id":"L13299","name":"Mallard Sand & Gravel Co."},"validFrom":"2007-03-22","validTo":"2008-12-03","current":false,"derived":true,"evidenceMineId":"2501231","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2501231|L13299|2007-03-22|M00146|1993-08-13|105090"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M06183","name":"CRH PLC"},"object":{"type":"mine","id":"2501231","name":"West Center Sand"},"validFrom":"2008-01-03","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2501231|M06183|2008-01-03|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0085824","name":"Mallard Sand and Gravel"},"object":{"type":"mine","id":"2501231","name":"West Center Sand"},"validFrom":"2008-12-04","validTo":"2018-06-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2501231|0085824|2008-12-04|2018-06-22"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M06183","name":"CRH PLC"},"object":{"type":"operator","id":"0085824","name":"Mallard Sand and Gravel"},"validFrom":"2008-12-04","validTo":"2018-06-22","current":false,"derived":true,"evidenceMineId":"2501231","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2501231|0085824|2008-12-04|M06183|2008-01-03|137505"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L16197","name":"Martin Marietta Materials, Inc."},"object":{"type":"mine","id":"2501231","name":"West Center Sand"},"validFrom":"2018-06-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2501231|L16197|2018-06-23|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"L16197","name":"Martin Marietta Materials, Inc."},"validFrom":"2018-06-23","validTo":null,"current":true,"derived":true,"evidenceMineId":"2501231","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2501231|L16197|2018-06-23|M00174|1950-01-01|106089"}}],"coverage":{"historyRecords":3,"edgeCount":9,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"2501231","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"}}