{"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":"2026-10-18T09:31:49.615908+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":"4003395","name":"Calhoun Quarry"},"operator":{"type":"operator","id":"0113025","name":"Bluegrass Materials Company, LLC"},"controller":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-18T09:31:49.615908+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"0095673","name":"Panadero Aggregates Holdings, LLC"},"object":{"type":"mine","id":"4003395","name":"Calhoun Quarry"},"validFrom":"2010-08-26","validTo":"2018-04-26","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"4003395|0095673|2010-08-26|2018-04-26"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0118047","name":"East Tennessee Materials"},"object":{"type":"mine","id":"4003395","name":"Calhoun Quarry"},"validFrom":"2011-04-27","validTo":"2012-07-20","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"4003395|0118047|2011-04-27|2012-07-20"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0099963","name":"Scott  Alexander"},"object":{"type":"mine","id":"4003395","name":"Calhoun Quarry"},"validFrom":"2011-04-27","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"4003395|0099963|2011-04-27|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0099963","name":"Scott  Alexander"},"object":{"type":"operator","id":"0118047","name":"East Tennessee Materials"},"validFrom":"2011-04-27","validTo":"2012-07-20","current":false,"derived":true,"evidenceMineId":"4003395","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"4003395|0118047|2011-04-27|0099963|2011-04-27|16626"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0113025","name":"Bluegrass Materials Company, LLC"},"object":{"type":"mine","id":"4003395","name":"Calhoun Quarry"},"validFrom":"2012-07-21","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"4003395|0113025|2012-07-21|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0095673","name":"Panadero Aggregates Holdings, LLC"},"object":{"type":"operator","id":"0113025","name":"Bluegrass Materials Company, LLC"},"validFrom":"2012-07-21","validTo":"2018-04-26","current":false,"derived":true,"evidenceMineId":"4003395","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"4003395|0113025|2012-07-21|0095673|2010-08-26|15781"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"mine","id":"4003395","name":"Calhoun Quarry"},"validFrom":"2018-04-27","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"4003395|M00174|2018-04-27|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00174","name":"Martin Marietta Materials Inc"},"object":{"type":"operator","id":"0113025","name":"Bluegrass Materials Company, LLC"},"validFrom":"2018-04-27","validTo":null,"current":true,"derived":true,"evidenceMineId":"4003395","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"4003395|0113025|2012-07-21|M00174|2018-04-27|106568"}}],"coverage":{"historyRecords":3,"edgeCount":8,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4003395","dataSource":"postgres","snapshotId":"2026-10-18T09:31:49.615908+00:00","completedAt":"2026-10-18T09:31:49.615Z","sourceCount":20,"totalRows":17915666,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}