{"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":"0405302","name":"MARTIN SAND AND GRAVEL"},"operator":{"type":"operator","id":"L12681","name":"KRC Aggregate Inc"},"controller":{"type":"controller","id":"M09717","name":"MDU Resources Group Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-18T09:31:49.615908+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M09717","name":"MDU Resources Group Inc"},"object":{"type":"mine","id":"0405302","name":"MARTIN SAND AND GRAVEL"},"validFrom":"1992-05-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0405302|M09717|1992-05-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L14972","name":"Martin Sand & Gravel"},"object":{"type":"mine","id":"0405302","name":"MARTIN SAND AND GRAVEL"},"validFrom":"1997-02-01","validTo":"2000-03-28","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0405302|L14972|1997-02-01|2000-03-28"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M11396","name":"Dennis  Glassburn"},"object":{"type":"mine","id":"0405302","name":"MARTIN SAND AND GRAVEL"},"validFrom":"1997-02-01","validTo":"2000-03-28","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0405302|M11396|1997-02-01|2000-03-28"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M11396","name":"Dennis  Glassburn"},"object":{"type":"operator","id":"L14972","name":"Martin Sand & Gravel"},"validFrom":"1997-02-01","validTo":"2000-03-28","current":false,"derived":true,"evidenceMineId":"0405302","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0405302|L14972|1997-02-01|M11396|1997-02-01|151363"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L12681","name":"KRC Aggregate Inc"},"object":{"type":"mine","id":"0405302","name":"MARTIN SAND AND GRAVEL"},"validFrom":"2000-03-29","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0405302|L12681|2000-03-29|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M09717","name":"MDU Resources Group Inc"},"object":{"type":"operator","id":"L12681","name":"KRC Aggregate Inc"},"validFrom":"2000-03-29","validTo":null,"current":true,"derived":true,"evidenceMineId":"0405302","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0405302|L12681|2000-03-29|M09717|1992-05-01|147058"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0405302","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"}}