{"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":"4103001","name":"TERRELL PLANT"},"operator":{"type":"operator","id":"L18213","name":"Meridian Aggregates Company Lp"},"controller":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M02859","name":"William  Boorhem  et al"},"object":{"type":"mine","id":"4103001","name":"TERRELL PLANT"},"validFrom":"1979-11-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4103001|M02859|1979-11-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L03564","name":"Boorhem-Fields Inc"},"object":{"type":"mine","id":"4103001","name":"TERRELL PLANT"},"validFrom":"1980-04-01","validTo":"1993-03-14","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4103001|L03564|1980-04-01|1993-03-14"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M02859","name":"William  Boorhem  et al"},"object":{"type":"operator","id":"L03564","name":"Boorhem-Fields Inc"},"validFrom":"1980-04-01","validTo":"1993-03-14","current":false,"derived":true,"evidenceMineId":"4103001","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4103001|L03564|1980-04-01|M02859|1979-11-01|127192"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M09944","name":"Meridian Aggregates Company LP"},"object":{"type":"mine","id":"4103001","name":"TERRELL PLANT"},"validFrom":"1991-03-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4103001|M09944|1991-03-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L13605","name":"Meridian Aggregates Company"},"object":{"type":"mine","id":"4103001","name":"TERRELL PLANT"},"validFrom":"1993-03-15","validTo":"2001-04-02","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4103001|L13605|1993-03-15|2001-04-02"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M09944","name":"Meridian Aggregates Company LP"},"object":{"type":"operator","id":"L13605","name":"Meridian Aggregates Company"},"validFrom":"1993-03-15","validTo":"2001-04-02","current":false,"derived":true,"evidenceMineId":"4103001","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4103001|L13605|1993-03-15|M09944|1991-03-01|147966"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L18213","name":"Meridian Aggregates Company Lp"},"object":{"type":"mine","id":"4103001","name":"TERRELL PLANT"},"validFrom":"2001-04-03","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4103001|L18213|2001-04-03|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"mine","id":"4103001","name":"TERRELL PLANT"},"validFrom":"2001-04-03","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4103001|M00174|2001-04-03|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"L18213","name":"Meridian Aggregates Company Lp"},"validFrom":"2001-04-03","validTo":null,"current":true,"derived":true,"evidenceMineId":"4103001","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4103001|L18213|2001-04-03|M00174|2001-04-03|106403"}}],"coverage":{"historyRecords":3,"edgeCount":9,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4103001","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"}}