{"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":"0801397","name":"Buck Hammock Mining, LLC"},"operator":{"type":"operator","id":"0130233","name":"Buck Hammock Mine"},"controller":{"type":"controller","id":"0110781","name":"G Reed  Kempfer; William C  Kempfer"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"0127893","name":"J L Craggs LLC"},"object":{"type":"mine","id":"0801397","name":"Buck Hammock Mining, LLC"},"validFrom":"2013-01-14","validTo":"2013-10-09","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0801397|0127893|2013-01-14|2013-10-09"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0108741","name":"James L  Craggs"},"object":{"type":"mine","id":"0801397","name":"Buck Hammock Mining, LLC"},"validFrom":"2013-01-14","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0801397|0108741|2013-01-14|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0108741","name":"James L  Craggs"},"object":{"type":"operator","id":"0127893","name":"J L Craggs LLC"},"validFrom":"2013-01-14","validTo":"2013-10-09","current":false,"derived":true,"evidenceMineId":"0801397","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0801397|0127893|2013-01-14|0108741|2013-01-14|19589"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0130233","name":"Buck Hammock Mining Company LLC"},"object":{"type":"mine","id":"0801397","name":"Buck Hammock Mining, LLC"},"validFrom":"2013-10-10","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0801397|0130233|2013-10-10|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0110781","name":"G Reed  Kempfer et al"},"object":{"type":"mine","id":"0801397","name":"Buck Hammock Mining, LLC"},"validFrom":"2013-10-10","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0801397|0110781|2013-10-10|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0110781","name":"G Reed  Kempfer et al"},"object":{"type":"operator","id":"0130233","name":"Buck Hammock Mining Company LLC"},"validFrom":"2013-10-10","validTo":null,"current":true,"derived":true,"evidenceMineId":"0801397","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0801397|0130233|2013-10-10|0110781|2013-10-10|20328"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0110781","name":"William C  Kempfer et al"},"object":{"type":"operator","id":"0130233","name":"Buck Hammock Mining Company LLC"},"validFrom":"2013-10-10","validTo":null,"current":true,"derived":true,"evidenceMineId":"0801397","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0801397|0130233|2013-10-10|0110781|2013-10-10|20329"}}],"coverage":{"historyRecords":3,"edgeCount":7,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0801397","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"}}