{"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":"4703457","name":"Powerscreen Plant"},"operator":{"type":"operator","id":"L33110","name":"Evenson Construction Company Inc."},"controller":{"type":"controller","id":"M33110","name":"Patrick  Strachan"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M31646","name":"Eric  Gilbert"},"object":{"type":"mine","id":"4703457","name":"Powerscreen Plant"},"validFrom":"1950-01-01","validTo":"2014-12-23","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703457|M31646|1950-01-01|2014-12-23"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M33110","name":"Patrick  Strachan"},"object":{"type":"mine","id":"4703457","name":"Powerscreen Plant"},"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":"4703457|M33110|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L31646","name":"Cedar Lake Sand & Gravel Co. Inc."},"object":{"type":"mine","id":"4703457","name":"Powerscreen Plant"},"validFrom":"2006-05-16","validTo":"2016-02-23","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703457|L31646|2006-05-16|2016-02-23"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M31646","name":"Eric  Gilbert"},"object":{"type":"operator","id":"L31646","name":"Cedar Lake Sand & Gravel Co. Inc."},"validFrom":"2006-05-16","validTo":"2014-12-23","current":false,"derived":true,"evidenceMineId":"4703457","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703457|L31646|2006-05-16|M31646|1950-01-01|159976"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0116921","name":"Patrick J  Strachan et al"},"object":{"type":"mine","id":"4703457","name":"Powerscreen Plant"},"validFrom":"2014-12-24","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703457|0116921|2014-12-24|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0116921","name":"Patrick J  Strachan et al"},"object":{"type":"operator","id":"L31646","name":"Cedar Lake Sand & Gravel Co. Inc."},"validFrom":"2014-12-24","validTo":"2016-02-23","current":false,"derived":true,"evidenceMineId":"4703457","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703457|L31646|2006-05-16|0116921|2014-12-24|22185"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0116921","name":"James  Gilbert et al"},"object":{"type":"operator","id":"L31646","name":"Cedar Lake Sand & Gravel Co. Inc."},"validFrom":"2014-12-24","validTo":"2016-02-23","current":false,"derived":true,"evidenceMineId":"4703457","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703457|L31646|2006-05-16|0116921|2014-12-24|22186"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L33110","name":"Evenson Construction Company Inc."},"object":{"type":"mine","id":"4703457","name":"Powerscreen Plant"},"validFrom":"2016-02-24","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703457|L33110|2016-02-24|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M33110","name":"Patrick  Strachan"},"object":{"type":"operator","id":"L33110","name":"Evenson Construction Company Inc."},"validFrom":"2016-02-24","validTo":null,"current":true,"derived":true,"evidenceMineId":"4703457","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703457|L33110|2016-02-24|M33110|1950-01-01|161663"}}],"coverage":{"historyRecords":4,"edgeCount":9,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4703457","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"}}