{"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":"4404481","name":"Dorchester #1"},"operator":{"type":"operator","id":"P23136","name":"Glamorgan Coal Company"},"controller":{"type":"controller","id":"C05954","name":"Amvest Corporation"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C05954","name":"Amvest Corporation"},"object":{"type":"mine","id":"4404481","name":"Dorchester #1"},"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":"4404481|C05954|1950-01-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C05954","name":"Amvest Corporation"},"object":{"type":"mine","id":"4404481","name":"Dorchester #1"},"validFrom":"1976-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4404481|C05954|1976-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P06122","name":"Dorchester Coal Company"},"object":{"type":"mine","id":"4404481","name":"Dorchester #1"},"validFrom":"1976-10-01","validTo":"1997-02-10","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4404481|P06122|1976-10-01|1997-02-10"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C05954","name":"Amvest Corporation"},"object":{"type":"operator","id":"P06122","name":"Dorchester Coal Company"},"validFrom":"1976-10-01","validTo":"1997-02-10","current":false,"derived":true,"evidenceMineId":"4404481","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4404481|P06122|1976-10-01|C05954|1950-01-01|70329"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C12010","name":"(William) Scott  Moore"},"object":{"type":"mine","id":"4404481","name":"Dorchester #1"},"validFrom":"1994-09-12","validTo":"1998-02-15","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4404481|C12010|1994-09-12|1998-02-15"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P23566","name":"Sunny Side Coal Inc"},"object":{"type":"mine","id":"4404481","name":"Dorchester #1"},"validFrom":"1997-02-11","validTo":"1998-02-15","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4404481|P23566|1997-02-11|1998-02-15"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C12010","name":"(William) Scott  Moore"},"object":{"type":"operator","id":"P23566","name":"Sunny Side Coal Inc"},"validFrom":"1997-02-11","validTo":"1998-02-15","current":false,"derived":true,"evidenceMineId":"4404481","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4404481|P23566|1997-02-11|C12010|1994-09-12|85900"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P23136","name":"Glamorgan Coal Company"},"object":{"type":"mine","id":"4404481","name":"Dorchester #1"},"validFrom":"1998-02-16","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4404481|P23136|1998-02-16|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C05954","name":"Amvest Corporation"},"object":{"type":"operator","id":"P23136","name":"Glamorgan Coal Company"},"validFrom":"1998-02-16","validTo":null,"current":true,"derived":true,"evidenceMineId":"4404481","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4404481|P23136|1998-02-16|C05954|1976-01-01|70335"}}],"coverage":{"historyRecords":3,"edgeCount":9,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4404481","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"}}