{"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":"2401992","name":"Pipestone Quarry"},"operator":{"type":"operator","id":"0141213","name":"Pipestone Quarry, LLC"},"controller":{"type":"controller","id":"0120621","name":"Washington Companies"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00685","name":"Washington Group International Inc"},"object":{"type":"mine","id":"2401992","name":"Pipestone Quarry"},"validFrom":"1986-04-01","validTo":"2007-11-14","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2401992|M00685|1986-04-01|2007-11-14"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L17528","name":"URS Energy and Construction, Inc."},"object":{"type":"mine","id":"2401992","name":"Pipestone Quarry"},"validFrom":"1992-10-01","validTo":"2015-10-04","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2401992|L17528|1992-10-01|2015-10-04"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00685","name":"Washington Group International Inc"},"object":{"type":"operator","id":"L17528","name":"URS Energy and Construction, Inc."},"validFrom":"1992-10-01","validTo":"2007-11-14","current":false,"derived":true,"evidenceMineId":"2401992","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2401992|L17528|1992-10-01|M00685|1986-04-01|114115"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0081077","name":"URS Corporation"},"object":{"type":"mine","id":"2401992","name":"Pipestone Quarry"},"validFrom":"2007-11-15","validTo":"2014-12-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2401992|0081077|2007-11-15|2014-12-31"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0081077","name":"URS Corporation"},"object":{"type":"operator","id":"L17528","name":"URS Energy and Construction, Inc."},"validFrom":"2007-11-15","validTo":"2014-12-31","current":false,"derived":true,"evidenceMineId":"2401992","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2401992|L17528|1992-10-01|0081077|2007-11-15|12854"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0116721","name":"AECOM"},"object":{"type":"mine","id":"2401992","name":"Pipestone Quarry"},"validFrom":"2015-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2401992|0116721|2015-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0116721","name":"AECOM"},"object":{"type":"operator","id":"L17528","name":"URS Energy and Construction, Inc."},"validFrom":"2015-01-01","validTo":"2015-10-04","current":false,"derived":true,"evidenceMineId":"2401992","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2401992|L17528|1992-10-01|0116721|2015-01-01|22133"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0141213","name":"Pipestone Quarry, LLC"},"object":{"type":"mine","id":"2401992","name":"Pipestone Quarry"},"validFrom":"2015-10-05","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2401992|0141213|2015-10-05|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0120621","name":"Washington Companies"},"object":{"type":"mine","id":"2401992","name":"Pipestone Quarry"},"validFrom":"2015-10-05","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2401992|0120621|2015-10-05|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0120621","name":"Washington Companies"},"object":{"type":"operator","id":"0141213","name":"Pipestone Quarry, LLC"},"validFrom":"2015-10-05","validTo":null,"current":true,"derived":true,"evidenceMineId":"2401992","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2401992|0141213|2015-10-05|0120621|2015-10-05|23521"}}],"coverage":{"historyRecords":4,"edgeCount":10,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"2401992","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"}}