{"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":"0202588","name":"Portable Plant- Safford"},"operator":{"type":"operator","id":"0066904","name":"Tri County Materials, Inc"},"controller":{"type":"controller","id":"0192101","name":"George  Vlassis; Peter  Vlassis; Steven  Vlassis"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00718","name":"Andrew J  Gilbert III"},"object":{"type":"mine","id":"0202588","name":"Portable Plant- Safford"},"validFrom":"1983-02-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|M00718|1983-02-17|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L06153","name":"W A Morris Sand & Gravel Company Inc"},"object":{"type":"mine","id":"0202588","name":"Portable Plant- Safford"},"validFrom":"1993-03-01","validTo":"2005-09-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|L06153|1993-03-01|2005-09-30"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00718","name":"Andrew J  Gilbert III"},"object":{"type":"operator","id":"L06153","name":"W A Morris Sand & Gravel Company Inc"},"validFrom":"1993-03-01","validTo":"2005-09-30","current":false,"derived":true,"evidenceMineId":"0202588","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|L06153|1993-03-01|M00718|1983-02-17|114360"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0066904","name":"Tri County Materials, Inc"},"object":{"type":"mine","id":"0202588","name":"Portable Plant- Safford"},"validFrom":"2005-10-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|0066904|2005-10-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00718","name":"Andrew J  Gilbert III"},"object":{"type":"mine","id":"0202588","name":"Portable Plant- Safford"},"validFrom":"2005-12-15","validTo":"2015-09-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|M00718|2005-12-15|2015-09-30"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00718","name":"Andrew J  Gilbert III"},"object":{"type":"operator","id":"0066904","name":"Tri County Materials, Inc"},"validFrom":"2005-12-15","validTo":"2015-09-30","current":false,"derived":true,"evidenceMineId":"0202588","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|0066904|2005-10-01|M00718|2005-12-15|114362"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0122621","name":"Shirley L  Gilbert et al"},"object":{"type":"mine","id":"0202588","name":"Portable Plant- Safford"},"validFrom":"2015-10-01","validTo":"2018-06-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|0122621|2015-10-01|2018-06-30"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0122621","name":"Shirley L  Gilbert et al"},"object":{"type":"operator","id":"0066904","name":"Tri County Materials, Inc"},"validFrom":"2015-10-01","validTo":"2018-06-30","current":false,"derived":true,"evidenceMineId":"0202588","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|0066904|2005-10-01|0122621|2015-10-01|23839"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0122621","name":"Susan  Vlassis et al"},"object":{"type":"operator","id":"0066904","name":"Tri County Materials, Inc"},"validFrom":"2015-10-01","validTo":"2018-06-30","current":false,"derived":true,"evidenceMineId":"0202588","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|0066904|2005-10-01|0122621|2015-10-01|23840"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0162503","name":"Susan  Vlassis"},"object":{"type":"mine","id":"0202588","name":"Portable Plant- Safford"},"validFrom":"2018-07-01","validTo":"2024-08-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|0162503|2018-07-01|2024-08-31"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0162503","name":"Susan  Vlassis"},"object":{"type":"operator","id":"0066904","name":"Tri County Materials, Inc"},"validFrom":"2018-07-01","validTo":"2024-08-31","current":false,"derived":true,"evidenceMineId":"0202588","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|0066904|2005-10-01|0162503|2018-07-01|34081"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0192101","name":"Steven  Vlassis et al"},"object":{"type":"mine","id":"0202588","name":"Portable Plant- Safford"},"validFrom":"2024-09-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|0192101|2024-09-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0192101","name":"Steven  Vlassis et al"},"object":{"type":"operator","id":"0066904","name":"Tri County Materials, Inc"},"validFrom":"2024-09-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"0202588","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|0066904|2005-10-01|0192101|2024-09-01|40909"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0192101","name":"George  Vlassis et al"},"object":{"type":"operator","id":"0066904","name":"Tri County Materials, Inc"},"validFrom":"2024-09-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"0202588","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|0066904|2005-10-01|0192101|2024-09-01|40910"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0192101","name":"Peter  Vlassis et al"},"object":{"type":"operator","id":"0066904","name":"Tri County Materials, Inc"},"validFrom":"2024-09-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"0202588","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0202588|0066904|2005-10-01|0192101|2024-09-01|40911"}}],"coverage":{"historyRecords":8,"edgeCount":15,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0202588","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"}}