{"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":"0201892","name":"CHANDLER READY MIX-MINE #1"},"operator":{"type":"operator","id":"L14046","name":"Chandler Ready Mix Inc"},"controller":{"type":"controller","id":"M09149","name":"Cemex S A"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L03527","name":"Aztec Materials Inc"},"object":{"type":"mine","id":"0201892","name":"CHANDLER READY MIX-MINE #1"},"validFrom":"1978-03-09","validTo":"1995-02-28","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0201892|L03527|1978-03-09|1995-02-28"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M02828","name":"Ronald  Perkins"},"object":{"type":"mine","id":"0201892","name":"CHANDLER READY MIX-MINE #1"},"validFrom":"1978-03-09","validTo":"1998-03-15","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0201892|M02828|1978-03-09|1998-03-15"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M02828","name":"Ronald  Perkins"},"object":{"type":"operator","id":"L03527","name":"Aztec Materials Inc"},"validFrom":"1978-03-09","validTo":"1995-02-28","current":false,"derived":true,"evidenceMineId":"0201892","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0201892|L03527|1978-03-09|M02828|1978-03-09|127106"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L14046","name":"Chandler Ready Mix Inc"},"object":{"type":"mine","id":"0201892","name":"CHANDLER READY MIX-MINE #1"},"validFrom":"1995-03-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0201892|L14046|1995-03-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00649","name":"RMC Group PLC"},"object":{"type":"mine","id":"0201892","name":"CHANDLER READY MIX-MINE #1"},"validFrom":"1995-03-01","validTo":"2005-08-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0201892|M00649|1995-03-01|2005-08-30"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00649","name":"RMC Group PLC"},"object":{"type":"operator","id":"L14046","name":"Chandler Ready Mix Inc"},"validFrom":"1995-03-01","validTo":"2005-08-30","current":false,"derived":true,"evidenceMineId":"0201892","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0201892|L14046|1995-03-01|M00649|1995-03-01|113750"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M09149","name":"Cemex S A"},"object":{"type":"mine","id":"0201892","name":"CHANDLER READY MIX-MINE #1"},"validFrom":"2005-08-31","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0201892|M09149|2005-08-31|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M09149","name":"Cemex S A"},"object":{"type":"operator","id":"L14046","name":"Chandler Ready Mix Inc"},"validFrom":"2005-08-31","validTo":null,"current":true,"derived":true,"evidenceMineId":"0201892","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"0201892|L14046|1995-03-01|M09149|2005-08-31|145430"}}],"coverage":{"historyRecords":3,"edgeCount":8,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0201892","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"}}