{"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":"3003534","name":"Middleton"},"operator":{"type":"operator","id":"0134397","name":"Vermont Multicolor Slate Quarries Inc"},"controller":{"type":"controller","id":"0129643","name":"John (Roddy)  Rice"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M01073","name":"Yvonne M  Pratt et al"},"object":{"type":"mine","id":"3003534","name":"Middleton"},"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":"3003534|M01073|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L01227","name":"Ritchie Bros. Slate Co., Inc."},"object":{"type":"mine","id":"3003534","name":"Middleton"},"validFrom":"2006-04-12","validTo":"2009-10-02","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3003534|L01227|2006-04-12|2009-10-02"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M01073","name":"Yvonne M  Pratt et al"},"object":{"type":"operator","id":"L01227","name":"Ritchie Bros. Slate Co., Inc."},"validFrom":"2006-04-12","validTo":"2009-10-02","current":false,"derived":true,"evidenceMineId":"3003534","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3003534|L01227|2006-04-12|M01073|1950-01-01|116673"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0106325","name":"Mohawk Red International Slate Co Inc"},"object":{"type":"mine","id":"3003534","name":"Middleton"},"validFrom":"2009-10-03","validTo":"2014-09-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3003534|0106325|2009-10-03|2014-09-30"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0090053","name":"William J  Enny"},"object":{"type":"mine","id":"3003534","name":"Middleton"},"validFrom":"2009-10-03","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3003534|0090053|2009-10-03|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0090053","name":"William J  Enny"},"object":{"type":"operator","id":"0106325","name":"Mohawk Red International Slate Co Inc"},"validFrom":"2009-10-03","validTo":"2014-09-30","current":false,"derived":true,"evidenceMineId":"3003534","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3003534|0106325|2009-10-03|0090053|2009-10-03|14472"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0090053","name":"William J  Enny"},"object":{"type":"mine","id":"3003534","name":"Middleton"},"validFrom":"2014-07-23","validTo":"2016-09-28","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3003534|0090053|2014-07-23|2016-09-28"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0134397","name":"Vermont Multicolor Slate Quarries Inc"},"object":{"type":"mine","id":"3003534","name":"Middleton"},"validFrom":"2014-10-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3003534|0134397|2014-10-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0090053","name":"William J  Enny"},"object":{"type":"operator","id":"0134397","name":"Vermont Multicolor Slate Quarries Inc"},"validFrom":"2014-10-01","validTo":"2016-09-28","current":false,"derived":true,"evidenceMineId":"3003534","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3003534|0134397|2014-10-01|0090053|2014-07-23|14475"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0129643","name":"John (Roddy)  Rice"},"object":{"type":"mine","id":"3003534","name":"Middleton"},"validFrom":"2016-09-29","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3003534|0129643|2016-09-29|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0129643","name":"John (Roddy)  Rice"},"object":{"type":"operator","id":"0134397","name":"Vermont Multicolor Slate Quarries Inc"},"validFrom":"2016-09-29","validTo":null,"current":true,"derived":true,"evidenceMineId":"3003534","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3003534|0134397|2014-10-01|0129643|2016-09-29|26007"}}],"coverage":{"historyRecords":4,"edgeCount":11,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"3003534","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"}}