{"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":"2026-10-17T05:35:58.500035+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":"2800510","name":"Port Elizabeth Plant"},"operator":{"type":"operator","id":"L14417","name":"U.S. Silica Company, LLC"},"controller":{"type":"controller","id":"M11007","name":"USS Holdings Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00282","name":"Energy & Minerals Inc"},"object":{"type":"mine","id":"2800510","name":"Port Elizabeth Plant"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|M00282|1950-01-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00538","name":"S C R-Sibelco Nv et al"},"object":{"type":"mine","id":"2800510","name":"Port Elizabeth Plant"},"validFrom":"1950-01-01","validTo":"2020-12-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|M00538|1950-01-01|2020-12-31"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L01148","name":"George F Pettinos Inc"},"object":{"type":"mine","id":"2800510","name":"Port Elizabeth Plant"},"validFrom":"1950-01-01","validTo":"1988-09-20","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|L01148|1950-01-01|1988-09-20"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00999","name":"Lewis  Pettinos"},"object":{"type":"mine","id":"2800510","name":"Port Elizabeth Plant"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|M00999|1950-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00999","name":"Lewis  Pettinos"},"object":{"type":"operator","id":"L01148","name":"George F Pettinos Inc"},"validFrom":"1950-01-01","validTo":"1988-09-20","current":false,"derived":true,"evidenceMineId":"2800510","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|L01148|1950-01-01|M00999|1950-01-01|116402"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L07726","name":"Morie Company Inc"},"object":{"type":"mine","id":"2800510","name":"Port Elizabeth Plant"},"validFrom":"1988-09-21","validTo":"1996-12-02","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|L07726|1988-09-21|1996-12-02"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00282","name":"Energy & Minerals Inc"},"object":{"type":"operator","id":"L07726","name":"Morie Company Inc"},"validFrom":"1988-09-21","validTo":"1996-12-02","current":false,"derived":true,"evidenceMineId":"2800510","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|L07726|1988-09-21|M00282|1950-01-01|108914"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M11007","name":"USS Holdings Inc"},"object":{"type":"mine","id":"2800510","name":"Port Elizabeth Plant"},"validFrom":"1996-03-09","validTo":"2003-07-18","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|M11007|1996-03-09|2003-07-18"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M11007","name":"USS Holdings Inc"},"object":{"type":"mine","id":"2800510","name":"Port Elizabeth Plant"},"validFrom":"1996-03-09","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|M11007|1996-03-09|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00645","name":"Unimin Corp"},"object":{"type":"mine","id":"2800510","name":"Port Elizabeth Plant"},"validFrom":"1996-12-03","validTo":"1999-04-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|L00645|1996-12-03|1999-04-30"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00538","name":"S C R-Sibelco Nv et al"},"object":{"type":"operator","id":"L00645","name":"Unimin Corp"},"validFrom":"1996-12-03","validTo":"1999-04-30","current":false,"derived":true,"evidenceMineId":"2800510","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|L00645|1996-12-03|M00538|1950-01-01|112909"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L16688","name":"Better Materials Corp"},"object":{"type":"mine","id":"2800510","name":"Port Elizabeth Plant"},"validFrom":"1999-05-01","validTo":"2005-05-02","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|L16688|1999-05-01|2005-05-02"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M11007","name":"USS Holdings Inc"},"object":{"type":"operator","id":"L16688","name":"Better Materials Corp"},"validFrom":"1999-05-01","validTo":"2003-07-18","current":false,"derived":true,"evidenceMineId":"2800510","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|L16688|1999-05-01|M11007|1996-03-09|150471"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00521","name":"Hanson PLC"},"object":{"type":"mine","id":"2800510","name":"Port Elizabeth Plant"},"validFrom":"2003-07-19","validTo":"2007-08-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|M00521|2003-07-19|2007-08-22"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00521","name":"Hanson PLC"},"object":{"type":"operator","id":"L16688","name":"Better Materials Corp"},"validFrom":"2003-07-19","validTo":"2005-05-02","current":false,"derived":true,"evidenceMineId":"2800510","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|L16688|1999-05-01|M00521|2003-07-19|112695"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L14417","name":"U.S. Silica Company, LLC"},"object":{"type":"mine","id":"2800510","name":"Port Elizabeth Plant"},"validFrom":"2005-05-03","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|L14417|2005-05-03|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M11007","name":"USS Holdings Inc"},"object":{"type":"operator","id":"L14417","name":"U.S. Silica Company, LLC"},"validFrom":"2005-05-03","validTo":null,"current":true,"derived":true,"evidenceMineId":"2800510","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|L14417|2005-05-03|M11007|1996-03-09|150515"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"object":{"type":"mine","id":"2800510","name":"Port Elizabeth Plant"},"validFrom":"2007-08-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|M00004|2007-08-23|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"object":{"type":"operator","id":"L16688","name":"Better Materials Corp"},"validFrom":"2007-08-23","validTo":"2005-05-02","current":false,"derived":true,"evidenceMineId":"2800510","intervalAnomaly":true,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|L16688|1999-05-01|M00004|2007-08-23|100820"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0159743","name":"Covia Holdings LLC"},"object":{"type":"mine","id":"2800510","name":"Port Elizabeth Plant"},"validFrom":"2021-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|0159743|2021-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0159743","name":"Covia Holdings LLC"},"object":{"type":"operator","id":"L00645","name":"Unimin Corp"},"validFrom":"2021-01-01","validTo":"1999-04-30","current":false,"derived":true,"evidenceMineId":"2800510","intervalAnomaly":true,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2800510|L00645|1996-12-03|0159743|2021-01-01|33248"}}],"coverage":{"historyRecords":8,"edgeCount":21,"intervalAnomalies":2,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"2800510","dataSource":"postgres","snapshotId":"2026-10-17T05:35:58.500035+00:00","completedAt":"2026-10-17T06:17:15.228Z","sourceCount":20,"totalRows":15450873,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}