{"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":"1516716","name":"Limestone Mine"},"operator":{"type":"operator","id":"P24575","name":"Powell Mountain Coal Co., Inc."},"controller":{"type":"controller","id":"C16016","name":"Progress Energy Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C03792","name":"Jerry W  Maggard"},"object":{"type":"mine","id":"1516716","name":"Limestone Mine"},"validFrom":"1986-05-13","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516716|C03792|1986-05-13|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P17721","name":"Shirl Coal Inc"},"object":{"type":"mine","id":"1516716","name":"Limestone Mine"},"validFrom":"1989-09-01","validTo":"1991-11-19","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516716|P17721|1989-09-01|1991-11-19"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C03792","name":"Jerry W  Maggard"},"object":{"type":"operator","id":"P17721","name":"Shirl Coal Inc"},"validFrom":"1989-09-01","validTo":"1991-11-19","current":false,"derived":true,"evidenceMineId":"1516716","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516716|P17721|1989-09-01|C03792|1986-05-13|63885"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C12463","name":"Roger  Coleman"},"object":{"type":"mine","id":"1516716","name":"Limestone Mine"},"validFrom":"1990-02-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516716|C12463|1990-02-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P21799","name":"Kentucky Darby Coal Company"},"object":{"type":"mine","id":"1516716","name":"Limestone Mine"},"validFrom":"1991-11-20","validTo":"1993-12-07","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516716|P21799|1991-11-20|1993-12-07"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C05954","name":"Amvest Corporation"},"object":{"type":"mine","id":"1516716","name":"Limestone Mine"},"validFrom":"1991-11-20","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516716|C05954|1991-11-20|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C05954","name":"Amvest Corporation"},"object":{"type":"operator","id":"P21799","name":"Kentucky Darby Coal Company"},"validFrom":"1991-11-20","validTo":"1993-12-07","current":false,"derived":true,"evidenceMineId":"1516716","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516716|P21799|1991-11-20|C05954|1991-11-20|70382"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P20761","name":"Magic Mining Inc"},"object":{"type":"mine","id":"1516716","name":"Limestone Mine"},"validFrom":"1993-12-08","validTo":"2003-06-11","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516716|P20761|1993-12-08|2003-06-11"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C12463","name":"Roger  Coleman"},"object":{"type":"operator","id":"P20761","name":"Magic Mining Inc"},"validFrom":"1993-12-08","validTo":"2003-06-11","current":false,"derived":true,"evidenceMineId":"1516716","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516716|P20761|1993-12-08|C12463|1990-02-01|86948"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C16016","name":"Progress Energy Inc"},"object":{"type":"mine","id":"1516716","name":"Limestone Mine"},"validFrom":"2000-11-30","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516716|C16016|2000-11-30|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P24575","name":"Powell Mountain Coal Co., Inc."},"object":{"type":"mine","id":"1516716","name":"Limestone Mine"},"validFrom":"2003-06-12","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516716|P24575|2003-06-12|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C16016","name":"Progress Energy Inc"},"object":{"type":"operator","id":"P24575","name":"Powell Mountain Coal Co., Inc."},"validFrom":"2003-06-12","validTo":null,"current":true,"derived":true,"evidenceMineId":"1516716","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1516716|P24575|2003-06-12|C16016|2000-11-30|98017"}}],"coverage":{"historyRecords":4,"edgeCount":12,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1516716","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"}}