{"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":"4500757","name":"VANCOUVER ROCK PIT"},"operator":{"type":"operator","id":"L04689","name":"R & R Joint Venture"},"controller":{"type":"controller","id":"M03783","name":"Ronald M  Wamberg"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L03608","name":"Vancouver Rock Company"},"object":{"type":"mine","id":"4500757","name":"VANCOUVER ROCK PIT"},"validFrom":"1978-03-09","validTo":"1980-12-02","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4500757|L03608|1978-03-09|1980-12-02"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M02898","name":"Robert R  Mc Grew"},"object":{"type":"mine","id":"4500757","name":"VANCOUVER ROCK PIT"},"validFrom":"1978-03-09","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4500757|M02898|1978-03-09|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M02898","name":"Robert R  Mc Grew"},"object":{"type":"operator","id":"L03608","name":"Vancouver Rock Company"},"validFrom":"1978-03-09","validTo":"1980-12-02","current":false,"derived":true,"evidenceMineId":"4500757","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4500757|L03608|1978-03-09|M02898|1978-03-09|127290"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L04689","name":"R & R Joint Venture"},"object":{"type":"mine","id":"4500757","name":"VANCOUVER ROCK PIT"},"validFrom":"1980-12-03","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4500757|L04689|1980-12-03|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M03783","name":"Ronald M  Wamberg  et al"},"object":{"type":"mine","id":"4500757","name":"VANCOUVER ROCK PIT"},"validFrom":"1980-12-03","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4500757|M03783|1980-12-03|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M03783","name":"Ronald M  Wamberg  et al"},"object":{"type":"operator","id":"L04689","name":"R & R Joint Venture"},"validFrom":"1980-12-03","validTo":null,"current":true,"derived":true,"evidenceMineId":"4500757","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4500757|L04689|1980-12-03|M03783|1980-12-03|130061"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4500757","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"}}