{"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":"0401616","name":"Santa Margarita Aggregates"},"operator":{"type":"operator","id":"0064607","name":"Martin Marietta Northern California Aggregates,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":"M00002","name":"Koppers Company Inc"},"object":{"type":"mine","id":"0401616","name":"Santa Margarita Aggregates"},"validFrom":"1950-01-01","validTo":"1988-11-13","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0401616|M00002|1950-01-01|1988-11-13"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00521","name":"Hanson PLC"},"object":{"type":"mine","id":"0401616","name":"Santa Margarita Aggregates"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0401616|M00521|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00528","name":"Kaiser Sand & Gravel Company"},"object":{"type":"mine","id":"0401616","name":"Santa Margarita Aggregates"},"validFrom":"1978-01-01","validTo":"1988-11-13","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0401616|L00528|1978-01-01|1988-11-13"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00002","name":"Koppers Company Inc"},"object":{"type":"operator","id":"L00528","name":"Kaiser Sand & Gravel Company"},"validFrom":"1978-01-01","validTo":"1988-11-13","current":false,"derived":true,"evidenceMineId":"0401616","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0401616|L00528|1978-01-01|M00002|1950-01-01|100255"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L16203","name":"Hanson Aggregates West Inc"},"object":{"type":"mine","id":"0401616","name":"Santa Margarita Aggregates"},"validFrom":"1988-11-14","validTo":"2006-05-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0401616|L16203|1988-11-14|2006-05-31"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00521","name":"Hanson PLC"},"object":{"type":"operator","id":"L16203","name":"Hanson Aggregates West Inc"},"validFrom":"1988-11-14","validTo":"2006-05-31","current":false,"derived":true,"evidenceMineId":"0401616","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0401616|L16203|1988-11-14|M00521|1950-01-01|112052"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00521","name":"Hanson PLC"},"object":{"type":"mine","id":"0401616","name":"Santa Margarita Aggregates"},"validFrom":"2005-09-15","validTo":"2007-08-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0401616|M00521|2005-09-15|2007-08-22"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0064607","name":"Martin Marietta Northern California Aggregates,LLC"},"object":{"type":"mine","id":"0401616","name":"Santa Margarita Aggregates"},"validFrom":"2006-06-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0401616|0064607|2006-06-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00521","name":"Hanson PLC"},"object":{"type":"operator","id":"0064607","name":"Martin Marietta Northern California Aggregates,LLC"},"validFrom":"2006-06-01","validTo":"2007-08-22","current":false,"derived":true,"evidenceMineId":"0401616","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0401616|0064607|2006-06-01|M00521|2005-09-15|112724"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"object":{"type":"mine","id":"0401616","name":"Santa Margarita Aggregates"},"validFrom":"2007-08-23","validTo":"2021-09-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0401616|M00004|2007-08-23|2021-09-30"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"object":{"type":"operator","id":"0064607","name":"Martin Marietta Northern California Aggregates,LLC"},"validFrom":"2007-08-23","validTo":"2021-09-30","current":false,"derived":true,"evidenceMineId":"0401616","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0401616|0064607|2006-06-01|M00004|2007-08-23|100642"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"mine","id":"0401616","name":"Santa Margarita Aggregates"},"validFrom":"2021-10-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0401616|M00174|2021-10-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"0064607","name":"Martin Marietta Northern California Aggregates,LLC"},"validFrom":"2021-10-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"0401616","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0401616|0064607|2006-06-01|M00174|2021-10-01|106614"}}],"coverage":{"historyRecords":5,"edgeCount":13,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0401616","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"}}