{"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":"4104159","name":"Black Spur Quarry"},"operator":{"type":"operator","id":"0084984","name":"Martin Marietta Materials Southwest LLC"},"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":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"mine","id":"4104159","name":"Black Spur Quarry"},"validFrom":"1998-12-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4104159|M00174|1998-12-17|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L17505","name":"Smyth Mines Llp"},"object":{"type":"mine","id":"4104159","name":"Black Spur Quarry"},"validFrom":"2000-01-01","validTo":"2002-05-15","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4104159|L17505|2000-01-01|2002-05-15"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M13356","name":"Fisher Sand & Gravel Co et al"},"object":{"type":"mine","id":"4104159","name":"Black Spur Quarry"},"validFrom":"2000-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4104159|M13356|2000-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M13356","name":"Fisher Sand & Gravel Co et al"},"object":{"type":"operator","id":"L17505","name":"Smyth Mines Llp"},"validFrom":"2000-01-01","validTo":"2002-05-15","current":false,"derived":true,"evidenceMineId":"4104159","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4104159|L17505|2000-01-01|M13356|2000-01-01|156075"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M13356","name":"Smyth Mines Inc et al"},"object":{"type":"operator","id":"L17505","name":"Smyth Mines Llp"},"validFrom":"2000-01-01","validTo":"2002-05-15","current":false,"derived":true,"evidenceMineId":"4104159","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4104159|L17505|2000-01-01|M13356|2000-01-01|156076"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L16206","name":"Martin Marietta Materials Southwest, Ltd."},"object":{"type":"mine","id":"4104159","name":"Black Spur Quarry"},"validFrom":"2002-05-16","validTo":"2007-12-02","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4104159|L16206|2002-05-16|2007-12-02"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"L16206","name":"Martin Marietta Materials Southwest, Ltd."},"validFrom":"2002-05-16","validTo":"2007-12-02","current":false,"derived":true,"evidenceMineId":"4104159","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4104159|L16206|2002-05-16|M00174|1998-12-17|106375"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"mine","id":"4104159","name":"Black Spur Quarry"},"validFrom":"2007-11-26","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4104159|M00174|2007-11-26|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0084984","name":"Martin Marietta Materials Southwest LLC"},"object":{"type":"mine","id":"4104159","name":"Black Spur Quarry"},"validFrom":"2007-12-03","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4104159|0084984|2007-12-03|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"0084984","name":"Martin Marietta Materials Southwest LLC"},"validFrom":"2007-12-03","validTo":null,"current":true,"derived":true,"evidenceMineId":"4104159","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4104159|0084984|2007-12-03|M00174|2007-11-26|106446"}}],"coverage":{"historyRecords":4,"edgeCount":10,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4104159","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"}}