{"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":"1519575","name":"No 1"},"operator":{"type":"operator","id":"0118189","name":"D & D Mining Inc"},"controller":{"type":"controller","id":"0100167","name":"David  Gayheart"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-18T09:31:49.615908+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C00286","name":"TECO Energy Inc"},"object":{"type":"mine","id":"1519575","name":"No 1"},"validFrom":"1991-12-02","validTo":"2015-09-20","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1519575|C00286|1991-12-02|2015-09-20"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P21756","name":"Premier Elkhorn Coal Co."},"object":{"type":"mine","id":"1519575","name":"No 1"},"validFrom":"2011-03-31","validTo":"2011-05-09","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1519575|P21756|2011-03-31|2011-05-09"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C00286","name":"TECO Energy Inc"},"object":{"type":"operator","id":"P21756","name":"Premier Elkhorn Coal Co."},"validFrom":"2011-03-31","validTo":"2011-05-09","current":false,"derived":true,"evidenceMineId":"1519575","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1519575|P21756|2011-03-31|C00286|1991-12-02|45884"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0118189","name":"D & D Mining Inc"},"object":{"type":"mine","id":"1519575","name":"No 1"},"validFrom":"2011-05-10","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1519575|0118189|2011-05-10|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0100167","name":"David  Gayheart"},"object":{"type":"mine","id":"1519575","name":"No 1"},"validFrom":"2011-05-10","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1519575|0100167|2011-05-10|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0100167","name":"David  Gayheart"},"object":{"type":"operator","id":"0118189","name":"D & D Mining Inc"},"validFrom":"2011-05-10","validTo":null,"current":true,"derived":true,"evidenceMineId":"1519575","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1519575|0118189|2011-05-10|0100167|2011-05-10|16698"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C11194","name":"James H  Booth et al"},"object":{"type":"mine","id":"1519575","name":"No 1"},"validFrom":"2015-09-21","validTo":"2019-06-15","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1519575|C11194|2015-09-21|2019-06-15"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C11194","name":"James H  Booth et al"},"object":{"type":"operator","id":"P21756","name":"Premier Elkhorn Coal Co."},"validFrom":"2015-09-21","validTo":"2011-05-09","current":false,"derived":true,"evidenceMineId":"1519575","intervalAnomaly":true,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1519575|P21756|2011-03-31|C11194|2015-09-21|84085"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0149203","name":"J Mark  Campbell"},"object":{"type":"mine","id":"1519575","name":"No 1"},"validFrom":"2019-06-16","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1519575|0149203|2019-06-16|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0149203","name":"J Mark  Campbell"},"object":{"type":"operator","id":"P21756","name":"Premier Elkhorn Coal Co."},"validFrom":"2019-06-16","validTo":"2011-05-09","current":false,"derived":true,"evidenceMineId":"1519575","intervalAnomaly":true,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"1519575|P21756|2011-03-31|0149203|2019-06-16|30632"}}],"coverage":{"historyRecords":4,"edgeCount":10,"intervalAnomalies":2,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1519575","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"}}