{"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":"0404114","name":"Calspar Mine"},"operator":{"type":"operator","id":"L08493","name":"Calspar Division-Steelhead Resources Inc"},"controller":{"type":"controller","id":"M06742","name":"Steelhead Resources Ltd"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L05646","name":"Descher Corp"},"object":{"type":"mine","id":"0404114","name":"Calspar Mine"},"validFrom":"1950-01-01","validTo":"1981-08-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0404114|L05646|1950-01-01|1981-08-30"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M04559","name":"Descher Raymond J"},"object":{"type":"mine","id":"0404114","name":"Calspar Mine"},"validFrom":"1950-01-01","validTo":"1981-08-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0404114|M04559|1950-01-01|1981-08-30"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M04559","name":"Descher Raymond J"},"object":{"type":"operator","id":"L05646","name":"Descher Corp"},"validFrom":"1950-01-01","validTo":"1981-08-30","current":false,"derived":true,"evidenceMineId":"0404114","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0404114|L05646|1950-01-01|M04559|1950-01-01|132237"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L05647","name":"Calspar Inc"},"object":{"type":"mine","id":"0404114","name":"Calspar Mine"},"validFrom":"1981-08-31","validTo":"1986-02-10","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0404114|L05647|1981-08-31|1986-02-10"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M03726","name":"Industrial Mineral Products Inc"},"object":{"type":"mine","id":"0404114","name":"Calspar Mine"},"validFrom":"1981-08-31","validTo":"1986-02-10","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0404114|M03726|1981-08-31|1986-02-10"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M03726","name":"Industrial Mineral Products Inc"},"object":{"type":"operator","id":"L05647","name":"Calspar Inc"},"validFrom":"1981-08-31","validTo":"1986-02-10","current":false,"derived":true,"evidenceMineId":"0404114","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0404114|L05647|1981-08-31|M03726|1981-08-31|129905"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L08493","name":"Calspar Division-Steelhead Resources Inc"},"object":{"type":"mine","id":"0404114","name":"Calspar Mine"},"validFrom":"1986-02-11","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0404114|L08493|1986-02-11|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M06742","name":"Steelhead Resources Ltd"},"object":{"type":"mine","id":"0404114","name":"Calspar Mine"},"validFrom":"1986-02-11","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0404114|M06742|1986-02-11|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M06742","name":"Steelhead Resources Ltd"},"object":{"type":"operator","id":"L08493","name":"Calspar Division-Steelhead Resources Inc"},"validFrom":"1986-02-11","validTo":null,"current":true,"derived":true,"evidenceMineId":"0404114","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0404114|L08493|1986-02-11|M06742|1986-02-11|139250"}}],"coverage":{"historyRecords":3,"edgeCount":9,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0404114","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"}}