{"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":"2026-10-17T05:35:58.500035+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":"1512905","name":"LAUREL QUARRY"},"operator":{"type":"operator","id":"L16286","name":"HEIDELBERG MATERIALS MIDWEST AGG, INC."},"controller":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L10633","name":"Elmo Greer & Sons Inc"},"object":{"type":"mine","id":"1512905","name":"LAUREL QUARRY"},"validFrom":"1981-06-01","validTo":"1997-02-02","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1512905|L10633|1981-06-01|1997-02-02"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M08257","name":"Rex  Greer"},"object":{"type":"mine","id":"1512905","name":"LAUREL QUARRY"},"validFrom":"1981-06-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1512905|M08257|1981-06-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M08257","name":"Rex  Greer"},"object":{"type":"operator","id":"L10633","name":"Elmo Greer & Sons Inc"},"validFrom":"1981-06-01","validTo":"1997-02-02","current":false,"derived":true,"evidenceMineId":"1512905","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1512905|L10633|1981-06-01|M08257|1981-06-01|143025"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00521","name":"Hanson PLC"},"object":{"type":"mine","id":"1512905","name":"LAUREL QUARRY"},"validFrom":"1988-11-14","validTo":"2007-08-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1512905|M00521|1988-11-14|2007-08-22"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L16286","name":"Heidelberg Materials Midwest Agg, Inc."},"object":{"type":"mine","id":"1512905","name":"LAUREL QUARRY"},"validFrom":"1997-02-03","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1512905|L16286|1997-02-03|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00521","name":"Hanson PLC"},"object":{"type":"operator","id":"L16286","name":"Heidelberg Materials Midwest Agg, Inc."},"validFrom":"1997-02-03","validTo":"2007-08-22","current":false,"derived":true,"evidenceMineId":"1512905","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1512905|L16286|1997-02-03|M00521|1988-11-14|112225"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"object":{"type":"mine","id":"1512905","name":"LAUREL QUARRY"},"validFrom":"2007-08-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1512905|M00004|2007-08-23|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"object":{"type":"operator","id":"L16286","name":"Heidelberg Materials Midwest Agg, Inc."},"validFrom":"2007-08-23","validTo":null,"current":true,"derived":true,"evidenceMineId":"1512905","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1512905|L16286|1997-02-03|M00004|2007-08-23|100810"}}],"coverage":{"historyRecords":3,"edgeCount":8,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1512905","dataSource":"postgres","snapshotId":"2026-10-17T05:35:58.500035+00:00","completedAt":"2026-10-17T06:17:15.228Z","sourceCount":20,"totalRows":15450873,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}