{"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":"4800018","name":"Granite Canyon Quarry"},"operator":{"type":"operator","id":"L16197","name":"Martin Marietta Materials"},"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":"4800018","name":"Granite Canyon Quarry"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|M00174|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00297","name":"Morrison-Knudsen Company Inc"},"object":{"type":"mine","id":"4800018","name":"Granite Canyon Quarry"},"validFrom":"1950-01-01","validTo":"1987-11-29","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|L00297|1950-01-01|1987-11-29"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00241","name":"Morrison Knudsen Corp (Old)"},"object":{"type":"mine","id":"4800018","name":"Granite Canyon Quarry"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|M00241|1950-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00241","name":"Morrison Knudsen Corp (Old)"},"object":{"type":"operator","id":"L00297","name":"Morrison-Knudsen Company Inc"},"validFrom":"1950-01-01","validTo":"1987-11-29","current":false,"derived":true,"evidenceMineId":"4800018","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|L00297|1950-01-01|M00241|1950-01-01|108051"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00467","name":"Burlington Resources Inc"},"object":{"type":"mine","id":"4800018","name":"Granite Canyon Quarry"},"validFrom":"1981-11-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|M00467|1981-11-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L08379","name":"Meridian Aggregates Company"},"object":{"type":"mine","id":"4800018","name":"Granite Canyon Quarry"},"validFrom":"1987-11-30","validTo":"1991-02-28","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|L08379|1987-11-30|1991-02-28"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00467","name":"Burlington Resources Inc"},"object":{"type":"operator","id":"L08379","name":"Meridian Aggregates Company"},"validFrom":"1987-11-30","validTo":"1991-02-28","current":false,"derived":true,"evidenceMineId":"4800018","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|L08379|1987-11-30|M00467|1981-11-01|111572"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L12278","name":"Meridian Aggregates Company"},"object":{"type":"mine","id":"4800018","name":"Granite Canyon Quarry"},"validFrom":"1991-03-01","validTo":"2001-04-09","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|L12278|1991-03-01|2001-04-09"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M09430","name":"Kiewit Mining Group Inc & Mac Acquisitions L P"},"object":{"type":"mine","id":"4800018","name":"Granite Canyon Quarry"},"validFrom":"1991-03-01","validTo":"2001-04-09","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|M09430|1991-03-01|2001-04-09"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M09430","name":"Kiewit Mining Group Inc & Mac Acquisitions L P"},"object":{"type":"operator","id":"L12278","name":"Meridian Aggregates Company"},"validFrom":"1991-03-01","validTo":"2001-04-09","current":false,"derived":true,"evidenceMineId":"4800018","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|L12278|1991-03-01|M09430|1991-03-01|146369"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L18353","name":"Meridian Granite Company"},"object":{"type":"mine","id":"4800018","name":"Granite Canyon Quarry"},"validFrom":"2001-04-10","validTo":"2017-09-10","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|L18353|2001-04-10|2017-09-10"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"mine","id":"4800018","name":"Granite Canyon Quarry"},"validFrom":"2001-04-10","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|M00174|2001-04-10|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"L18353","name":"Meridian Granite Company"},"validFrom":"2001-04-10","validTo":"2017-09-10","current":false,"derived":true,"evidenceMineId":"4800018","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|L18353|2001-04-10|M00174|2001-04-10|106410"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L16197","name":"Martin Marietta Materials"},"object":{"type":"mine","id":"4800018","name":"Granite Canyon Quarry"},"validFrom":"2017-09-11","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|L16197|2017-09-11|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"L16197","name":"Martin Marietta Materials"},"validFrom":"2017-09-11","validTo":null,"current":true,"derived":true,"evidenceMineId":"4800018","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4800018|L16197|2017-09-11|M00174|1950-01-01|106336"}}],"coverage":{"historyRecords":5,"edgeCount":15,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4800018","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"}}