{"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":"2026-10-18T09:31:49.615908+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":"5001267","name":"Hecla Greens Creek Mine"},"operator":{"type":"operator","id":"L11319","name":"Hecla Greens Creek Mining Company"},"controller":{"type":"controller","id":"M00089","name":"Hecla Mining Company"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-18T09:31:49.615908+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L08793","name":"Greens Creek Mining Company"},"object":{"type":"mine","id":"5001267","name":"Hecla Greens Creek Mine"},"validFrom":"1978-03-09","validTo":"1988-02-29","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5001267|L08793|1978-03-09|1988-02-29"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M06954","name":"Amselco Minerals Inc-Exalas Resources Corp Et Al"},"object":{"type":"mine","id":"5001267","name":"Hecla Greens Creek Mine"},"validFrom":"1978-03-09","validTo":"1988-02-29","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5001267|M06954|1978-03-09|1988-02-29"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M06954","name":"Amselco Minerals Inc-Exalas Resources Corp Et Al"},"object":{"type":"operator","id":"L08793","name":"Greens Creek Mining Company"},"validFrom":"1978-03-09","validTo":"1988-02-29","current":false,"derived":true,"evidenceMineId":"5001267","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5001267|L08793|1978-03-09|M06954|1978-03-09|139716"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L10053","name":"Greens Creek Mining Company"},"object":{"type":"mine","id":"5001267","name":"Hecla Greens Creek Mine"},"validFrom":"1988-03-01","validTo":"1989-06-29","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5001267|L10053|1988-03-01|1989-06-29"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M01206","name":"British Petroleum Company PLC"},"object":{"type":"mine","id":"5001267","name":"Hecla Greens Creek Mine"},"validFrom":"1988-03-01","validTo":"1989-06-29","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5001267|M01206|1988-03-01|1989-06-29"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M01206","name":"British Petroleum Company PLC"},"object":{"type":"operator","id":"L10053","name":"Greens Creek Mining Company"},"validFrom":"1988-03-01","validTo":"1989-06-29","current":false,"derived":true,"evidenceMineId":"5001267","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5001267|L10053|1988-03-01|M01206|1988-03-01|117466"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L11319","name":"Hecla Greens Creek Mining Company"},"object":{"type":"mine","id":"5001267","name":"Hecla Greens Creek Mine"},"validFrom":"1989-06-30","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5001267|L11319|1989-06-30|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M01812","name":"Rio Tinto Group"},"object":{"type":"mine","id":"5001267","name":"Hecla Greens Creek Mine"},"validFrom":"1989-06-30","validTo":"2008-04-23","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5001267|M01812|1989-06-30|2008-04-23"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M01812","name":"Rio Tinto Group"},"object":{"type":"operator","id":"L11319","name":"Hecla Greens Creek Mining Company"},"validFrom":"1989-06-30","validTo":"2008-04-23","current":false,"derived":true,"evidenceMineId":"5001267","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5001267|L11319|1989-06-30|M01812|1989-06-30|121405"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00089","name":"Hecla Mining Company"},"object":{"type":"mine","id":"5001267","name":"Hecla Greens Creek Mine"},"validFrom":"2008-04-24","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5001267|M00089|2008-04-24|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00089","name":"Hecla Mining Company"},"object":{"type":"operator","id":"L11319","name":"Hecla Greens Creek Mining Company"},"validFrom":"2008-04-24","validTo":null,"current":true,"derived":true,"evidenceMineId":"5001267","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"5001267|L11319|1989-06-30|M00089|2008-04-24|104034"}}],"coverage":{"historyRecords":4,"edgeCount":11,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"5001267","dataSource":"postgres","snapshotId":"2026-10-18T09:31:49.615908+00:00","completedAt":"2026-10-18T09:31:49.615Z","sourceCount":20,"totalRows":17915666,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}