{"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":"1400126","name":"Augusta Quarry"},"operator":{"type":"operator","id":"0117666","name":"Cornejo & Sons LLC"},"controller":{"type":"controller","id":"M02046","name":"Summit Materials LLC"},"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":"1400126","name":"Augusta 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":"1400126|M00174|1950-01-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00626","name":"David S  Walker"},"object":{"type":"mine","id":"1400126","name":"Augusta 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":"1400126|M00626|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L01147","name":"George M Myers Inc"},"object":{"type":"mine","id":"1400126","name":"Augusta Quarry"},"validFrom":"1950-01-01","validTo":"1998-11-17","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1400126|L01147|1950-01-01|1998-11-17"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00998","name":"George Marc  Myers"},"object":{"type":"mine","id":"1400126","name":"Augusta 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":"1400126|M00998|1950-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00998","name":"George Marc  Myers"},"object":{"type":"operator","id":"L01147","name":"George M Myers Inc"},"validFrom":"1950-01-01","validTo":"1998-11-17","current":false,"derived":true,"evidenceMineId":"1400126","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1400126|L01147|1950-01-01|M00998|1950-01-01|116362"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00763","name":"Walker Stone Company Inc"},"object":{"type":"mine","id":"1400126","name":"Augusta Quarry"},"validFrom":"1998-11-18","validTo":"2001-08-02","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1400126|L00763|1998-11-18|2001-08-02"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00626","name":"David S  Walker"},"object":{"type":"operator","id":"L00763","name":"Walker Stone Company Inc"},"validFrom":"1998-11-18","validTo":"2001-08-02","current":false,"derived":true,"evidenceMineId":"1400126","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1400126|L00763|1998-11-18|M00626|1950-01-01|113556"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00208","name":"Martin Marietta Aggregates"},"object":{"type":"mine","id":"1400126","name":"Augusta Quarry"},"validFrom":"2001-08-03","validTo":"2005-05-23","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1400126|L00208|2001-08-03|2005-05-23"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"L00208","name":"Martin Marietta Aggregates"},"validFrom":"2001-08-03","validTo":"2005-05-23","current":false,"derived":true,"evidenceMineId":"1400126","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1400126|L00208|2001-08-03|M00174|1950-01-01|105882"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L16197","name":"Martin Marietta Materials, Inc."},"object":{"type":"mine","id":"1400126","name":"Augusta Quarry"},"validFrom":"2005-05-24","validTo":"2020-07-02","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1400126|L16197|2005-05-24|2020-07-02"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"L16197","name":"Martin Marietta Materials, Inc."},"validFrom":"2005-05-24","validTo":"2020-07-02","current":false,"derived":true,"evidenceMineId":"1400126","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1400126|L16197|2005-05-24|M00174|1950-01-01|105883"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M02046","name":"Summit Materials LLC"},"object":{"type":"mine","id":"1400126","name":"Augusta Quarry"},"validFrom":"2011-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1400126|M02046|2011-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0117666","name":"Cornejo & Sons LLC"},"object":{"type":"mine","id":"1400126","name":"Augusta Quarry"},"validFrom":"2020-07-03","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1400126|0117666|2020-07-03|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M02046","name":"Summit Materials LLC"},"object":{"type":"operator","id":"0117666","name":"Cornejo & Sons LLC"},"validFrom":"2020-07-03","validTo":null,"current":true,"derived":true,"evidenceMineId":"1400126","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1400126|0117666|2020-07-03|M02046|2011-01-01|122828"}}],"coverage":{"historyRecords":5,"edgeCount":14,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1400126","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"}}