{"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":"0102660","name":"North Huntsville Quarry & Mill"},"operator":{"type":"operator","id":"0200133","name":"Martin Marietta Southeast Agg Operations, LLC"},"controller":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M02269","name":"Thomas S  Hoover"},"object":{"type":"mine","id":"0102660","name":"North Huntsville Quarry & Mill"},"validFrom":"1950-01-01","validTo":"2018-02-08","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0102660|M02269|1950-01-01|2018-02-08"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L02727","name":"Blue Water Industries"},"object":{"type":"mine","id":"0102660","name":"North Huntsville Quarry & Mill"},"validFrom":"1985-12-01","validTo":"2025-02-09","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0102660|L02727|1985-12-01|2025-02-09"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M02269","name":"Thomas S  Hoover"},"object":{"type":"operator","id":"L02727","name":"Blue Water Industries"},"validFrom":"1985-12-01","validTo":"2018-02-08","current":false,"derived":true,"evidenceMineId":"0102660","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0102660|L02727|1985-12-01|M02269|1950-01-01|124632"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0138921","name":"Blue Water Industries Holdings LLC"},"object":{"type":"mine","id":"0102660","name":"North Huntsville Quarry & Mill"},"validFrom":"2018-02-09","validTo":"2024-04-04","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0102660|0138921|2018-02-09|2024-04-04"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0138921","name":"Blue Water Industries Holdings LLC"},"object":{"type":"operator","id":"L02727","name":"Blue Water Industries"},"validFrom":"2018-02-09","validTo":"2024-04-04","current":false,"derived":true,"evidenceMineId":"0102660","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0102660|L02727|1985-12-01|0138921|2018-02-09|28130"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"mine","id":"0102660","name":"North Huntsville Quarry & Mill"},"validFrom":"2024-04-05","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0102660|M00174|2024-04-05|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"L02727","name":"Blue Water Industries"},"validFrom":"2024-04-05","validTo":"2025-02-09","current":false,"derived":true,"evidenceMineId":"0102660","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0102660|L02727|1985-12-01|M00174|2024-04-05|106681"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"mine","id":"0102660","name":"North Huntsville Quarry & Mill"},"validFrom":"2024-12-12","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0102660|M00174|2024-12-12|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0200133","name":"Martin Marietta Southeast Agg Operations, LLC"},"object":{"type":"mine","id":"0102660","name":"North Huntsville Quarry & Mill"},"validFrom":"2025-02-10","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0102660|0200133|2025-02-10|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"0200133","name":"Martin Marietta Southeast Agg Operations, LLC"},"validFrom":"2025-02-10","validTo":null,"current":true,"derived":true,"evidenceMineId":"0102660","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0102660|0200133|2025-02-10|M00174|2024-12-12|106716"}}],"coverage":{"historyRecords":4,"edgeCount":10,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0102660","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"}}