{"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":"4503750","name":"Hamilton"},"operator":{"type":"operator","id":"0122990","name":"Skagit Aggregates LLC"},"controller":{"type":"controller","id":"0104433","name":"Michael T  Crawford; Jerome W  Fisher"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"0104433","name":"Jerome W  Fisher et al"},"object":{"type":"mine","id":"4503750","name":"Hamilton"},"validFrom":"2012-04-30","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4503750|0104433|2012-04-30|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M07897","name":"Taiheiyo Cement Corp"},"object":{"type":"mine","id":"4503750","name":"Hamilton"},"validFrom":"2015-07-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4503750|M07897|2015-07-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0139773","name":"CPC Materials Inc."},"object":{"type":"mine","id":"4503750","name":"Hamilton"},"validFrom":"2016-08-19","validTo":"2025-06-15","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4503750|0139773|2016-08-19|2025-06-15"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M07897","name":"Taiheiyo Cement Corp"},"object":{"type":"operator","id":"0139773","name":"CPC Materials Inc."},"validFrom":"2016-08-19","validTo":"2025-06-15","current":false,"derived":true,"evidenceMineId":"4503750","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4503750|0139773|2016-08-19|M07897|2015-07-01|142277"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0122990","name":"Skagit Aggregates LLC"},"object":{"type":"mine","id":"4503750","name":"Hamilton"},"validFrom":"2025-06-16","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4503750|0122990|2025-06-16|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0104433","name":"Jerome W  Fisher et al"},"object":{"type":"operator","id":"0122990","name":"Skagit Aggregates LLC"},"validFrom":"2025-06-16","validTo":null,"current":true,"derived":true,"evidenceMineId":"4503750","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4503750|0122990|2025-06-16|0104433|2012-04-30|18237"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0104433","name":"Michael T  Crawford et al"},"object":{"type":"operator","id":"0122990","name":"Skagit Aggregates LLC"},"validFrom":"2025-06-16","validTo":null,"current":true,"derived":true,"evidenceMineId":"4503750","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4503750|0122990|2025-06-16|0104433|2012-04-30|18238"}}],"coverage":{"historyRecords":3,"edgeCount":7,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4503750","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"}}