{"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":"4503692","name":"Portable #2"},"operator":{"type":"operator","id":"0152314","name":"Cadman Materials Inc."},"controller":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M09149","name":"Cemex S A"},"object":{"type":"mine","id":"4503692","name":"Portable #2"},"validFrom":"2008-08-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4503692|M09149|2008-08-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0103149","name":"CEMEX Construction Materials Pacific, LLC"},"object":{"type":"mine","id":"4503692","name":"Portable #2"},"validFrom":"2011-08-16","validTo":"2017-06-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4503692|0103149|2011-08-16|2017-06-30"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M09149","name":"Cemex S A"},"object":{"type":"operator","id":"0103149","name":"CEMEX Construction Materials Pacific, LLC"},"validFrom":"2011-08-16","validTo":"2017-06-30","current":false,"derived":true,"evidenceMineId":"4503692","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4503692|0103149|2011-08-16|M09149|2008-08-01|145653"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"object":{"type":"mine","id":"4503692","name":"Portable #2"},"validFrom":"2017-06-30","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4503692|M00004|2017-06-30|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0152314","name":"Cadman Materials Inc."},"object":{"type":"mine","id":"4503692","name":"Portable #2"},"validFrom":"2017-07-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4503692|0152314|2017-07-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"object":{"type":"operator","id":"0152314","name":"Cadman Materials Inc."},"validFrom":"2017-07-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"4503692","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4503692|0152314|2017-07-01|M00004|2017-06-30|101050"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4503692","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"}}