{"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":"2200422","name":"NO. 1 PIT"},"operator":{"type":"operator","id":"L02231","name":"Hamilton Gravel Company"},"controller":{"type":"controller","id":"M01729","name":"Philip  Cockerham; John  Cockerham Jr"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L01462","name":"West Point Gravel Company"},"object":{"type":"mine","id":"2200422","name":"NO. 1 PIT"},"validFrom":"1950-01-01","validTo":"1978-08-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2200422|L01462|1950-01-01|1978-08-31"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M01307","name":"West Point Gravel Company"},"object":{"type":"mine","id":"2200422","name":"NO. 1 PIT"},"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":"2200422|M01307|1950-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M01307","name":"West Point Gravel Company"},"object":{"type":"operator","id":"L01462","name":"West Point Gravel Company"},"validFrom":"1950-01-01","validTo":"1978-08-31","current":false,"derived":true,"evidenceMineId":"2200422","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2200422|L01462|1950-01-01|M01307|1950-01-01|117855"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L02231","name":"Hamilton Gravel Company"},"object":{"type":"mine","id":"2200422","name":"NO. 1 PIT"},"validFrom":"1978-09-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2200422|L02231|1978-09-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M01729","name":"John  Cockerham Jr  et al"},"object":{"type":"mine","id":"2200422","name":"NO. 1 PIT"},"validFrom":"1978-09-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2200422|M01729|1978-09-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M01729","name":"John  Cockerham Jr  et al"},"object":{"type":"operator","id":"L02231","name":"Hamilton Gravel Company"},"validFrom":"1978-09-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"2200422","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2200422|L02231|1978-09-01|M01729|1978-09-01|120657"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M01729","name":"Philip  Cockerham  et al"},"object":{"type":"operator","id":"L02231","name":"Hamilton Gravel Company"},"validFrom":"1978-09-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"2200422","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2200422|L02231|1978-09-01|M01729|1978-09-01|120658"}}],"coverage":{"historyRecords":3,"edgeCount":7,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"2200422","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"}}