{"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":"3800613","name":"Myrtle Beach Quarry"},"operator":{"type":"operator","id":"L06023","name":"Southern Aggregates Company"},"controller":{"type":"controller","id":"M08942","name":"CSR Ltd"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M08942","name":"CSR Ltd"},"object":{"type":"mine","id":"3800613","name":"Myrtle Beach Quarry"},"validFrom":"1982-10-27","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3800613|M08942|1982-10-27|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L09177","name":"G & W Construction & Mining Inc"},"object":{"type":"mine","id":"3800613","name":"Myrtle Beach Quarry"},"validFrom":"1986-05-01","validTo":"1987-01-20","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3800613|L09177|1986-05-01|1987-01-20"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M07231","name":"Gore Roy & Terry Wright"},"object":{"type":"mine","id":"3800613","name":"Myrtle Beach Quarry"},"validFrom":"1986-05-01","validTo":"1987-01-20","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3800613|M07231|1986-05-01|1987-01-20"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M07231","name":"Gore Roy & Terry Wright"},"object":{"type":"operator","id":"L09177","name":"G & W Construction & Mining Inc"},"validFrom":"1986-05-01","validTo":"1987-01-20","current":false,"derived":true,"evidenceMineId":"3800613","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3800613|L09177|1986-05-01|M07231|1986-05-01|140386"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L09178","name":"Atlantic Coast Materials Inc"},"object":{"type":"mine","id":"3800613","name":"Myrtle Beach Quarry"},"validFrom":"1987-01-21","validTo":"1989-04-13","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3800613|L09178|1987-01-21|1989-04-13"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M07232","name":"Art  Cates et al"},"object":{"type":"mine","id":"3800613","name":"Myrtle Beach Quarry"},"validFrom":"1987-01-21","validTo":"1989-04-13","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3800613|M07232|1987-01-21|1989-04-13"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M07232","name":"Art  Cates et al"},"object":{"type":"operator","id":"L09178","name":"Atlantic Coast Materials Inc"},"validFrom":"1987-01-21","validTo":"1989-04-13","current":false,"derived":true,"evidenceMineId":"3800613","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3800613|L09178|1987-01-21|M07232|1987-01-21|140391"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L06023","name":"Southern Aggregates Company"},"object":{"type":"mine","id":"3800613","name":"Myrtle Beach Quarry"},"validFrom":"1989-04-14","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3800613|L06023|1989-04-14|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M08942","name":"CSR Ltd"},"object":{"type":"operator","id":"L06023","name":"Southern Aggregates Company"},"validFrom":"1989-04-14","validTo":null,"current":true,"derived":true,"evidenceMineId":"3800613","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3800613|L06023|1989-04-14|M08942|1982-10-27|144498"}}],"coverage":{"historyRecords":3,"edgeCount":9,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"3800613","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"}}