{"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":"3301181","name":"Huron Operations"},"operator":{"type":"operator","id":"L14947","name":"Carmeuse Lime Inc"},"controller":{"type":"controller","id":"M10266","name":"Carmeuse Holding SA"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M01135","name":"Margaret J  Heckman  et al"},"object":{"type":"mine","id":"3301181","name":"Huron Operations"},"validFrom":"1950-01-01","validTo":"2022-09-06","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3301181|M01135|1950-01-01|2022-09-06"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L09179","name":"Huron Lime Company"},"object":{"type":"mine","id":"3301181","name":"Huron Operations"},"validFrom":"1950-01-01","validTo":"1986-08-18","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3301181|L09179|1950-01-01|1986-08-18"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M07233","name":"National Steel Corp"},"object":{"type":"mine","id":"3301181","name":"Huron Operations"},"validFrom":"1950-01-01","validTo":"1986-08-18","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3301181|M07233|1950-01-01|1986-08-18"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M07233","name":"National Steel Corp"},"object":{"type":"operator","id":"L09179","name":"Huron Lime Company"},"validFrom":"1950-01-01","validTo":"1986-08-18","current":false,"derived":true,"evidenceMineId":"3301181","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3301181|L09179|1950-01-01|M07233|1950-01-01|140392"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L09180","name":"Huron Lime, Inc."},"object":{"type":"mine","id":"3301181","name":"Huron Operations"},"validFrom":"1986-08-19","validTo":"2014-01-01","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3301181|L09180|1986-08-19|2014-01-01"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M08176","name":"Jerome  Osborne et al"},"object":{"type":"mine","id":"3301181","name":"Huron Operations"},"validFrom":"1986-08-19","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3301181|M08176|1986-08-19|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M08176","name":"Jerome  Osborne et al"},"object":{"type":"operator","id":"L09180","name":"Huron Lime, Inc."},"validFrom":"1986-08-19","validTo":"2014-01-01","current":false,"derived":true,"evidenceMineId":"3301181","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3301181|L09180|1986-08-19|M08176|1986-08-19|142851"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M10266","name":"Carmeuse Holding SA"},"object":{"type":"mine","id":"3301181","name":"Huron Operations"},"validFrom":"1997-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3301181|M10266|1997-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L01289","name":"Mississippi Lime Company"},"object":{"type":"mine","id":"3301181","name":"Huron Operations"},"validFrom":"2014-01-02","validTo":"2018-04-11","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3301181|L01289|2014-01-02|2018-04-11"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M01135","name":"Margaret J  Heckman  et al"},"object":{"type":"operator","id":"L01289","name":"Mississippi Lime Company"},"validFrom":"2014-01-02","validTo":"2018-04-11","current":false,"derived":true,"evidenceMineId":"3301181","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3301181|L01289|2014-01-02|M01135|1950-01-01|116972"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L14947","name":"Carmeuse Lime Inc"},"object":{"type":"mine","id":"3301181","name":"Huron Operations"},"validFrom":"2018-04-12","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3301181|L14947|2018-04-12|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M10266","name":"Carmeuse Holding SA"},"object":{"type":"operator","id":"L14947","name":"Carmeuse Lime Inc"},"validFrom":"2018-04-12","validTo":null,"current":true,"derived":true,"evidenceMineId":"3301181","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3301181|L14947|2018-04-12|M10266|1997-01-01|148762"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0172040","name":"HBM Holdings Company"},"object":{"type":"mine","id":"3301181","name":"Huron Operations"},"validFrom":"2022-09-07","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3301181|0172040|2022-09-07|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0172040","name":"HBM Holdings Company"},"object":{"type":"operator","id":"L01289","name":"Mississippi Lime Company"},"validFrom":"2022-09-07","validTo":"2018-04-11","current":false,"derived":true,"evidenceMineId":"3301181","intervalAnomaly":true,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3301181|L01289|2014-01-02|0172040|2022-09-07|36594"}}],"coverage":{"historyRecords":5,"edgeCount":14,"intervalAnomalies":1,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"3301181","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"}}