{"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":"0600027","name":"Middletown Mine & Mill (Or) Feldspar"},"operator":{"type":"operator","id":"L00019","name":"Feldspar Corp"},"controller":{"type":"controller","id":"0099849","name":"Imerys S A; Norsk Mineral AS"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-18T09:31:49.615908+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00019","name":"Feldspar Corp"},"object":{"type":"mine","id":"0600027","name":"Middletown Mine & Mill (Or) Feldspar"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0600027|L00019|1950-01-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00060","name":"Zemex Corp"},"object":{"type":"mine","id":"0600027","name":"Middletown Mine & Mill (Or) Feldspar"},"validFrom":"1950-01-01","validTo":"2003-03-02","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0600027|M00060|1950-01-01|2003-03-02"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00060","name":"Zemex Corp"},"object":{"type":"operator","id":"L00019","name":"Feldspar Corp"},"validFrom":"1950-01-01","validTo":"2003-03-02","current":false,"derived":true,"evidenceMineId":"0600027","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0600027|L00019|1950-01-01|M00060|1950-01-01|103188"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0043075","name":"Cementos Pacasmayo SSA"},"object":{"type":"mine","id":"0600027","name":"Middletown Mine & Mill (Or) Feldspar"},"validFrom":"2003-03-03","validTo":"2007-09-04","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0600027|0043075|2003-03-03|2007-09-04"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0043075","name":"Cementos Pacasmayo SSA"},"object":{"type":"operator","id":"L00019","name":"Feldspar Corp"},"validFrom":"2003-03-03","validTo":"2007-09-04","current":false,"derived":true,"evidenceMineId":"0600027","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0600027|L00019|1950-01-01|0043075|2003-03-03|4464"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M11763","name":"Imerys S A"},"object":{"type":"mine","id":"0600027","name":"Middletown Mine & Mill (Or) Feldspar"},"validFrom":"2007-09-05","validTo":"2011-03-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0600027|M11763|2007-09-05|2011-03-31"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M11763","name":"Imerys S A"},"object":{"type":"operator","id":"L00019","name":"Feldspar Corp"},"validFrom":"2007-09-05","validTo":"2011-03-31","current":false,"derived":true,"evidenceMineId":"0600027","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0600027|L00019|1950-01-01|M11763|2007-09-05|152341"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0099849","name":"Imerys S A  et al"},"object":{"type":"mine","id":"0600027","name":"Middletown Mine & Mill (Or) Feldspar"},"validFrom":"2011-04-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0600027|0099849|2011-04-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0099849","name":"Imerys S A  et al"},"object":{"type":"operator","id":"L00019","name":"Feldspar Corp"},"validFrom":"2011-04-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"0600027","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0600027|L00019|1950-01-01|0099849|2011-04-01|16549"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0099849","name":"Norsk Mineral AS  et al"},"object":{"type":"operator","id":"L00019","name":"Feldspar Corp"},"validFrom":"2011-04-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"0600027","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"0600027|L00019|1950-01-01|0099849|2011-04-01|16550"}}],"coverage":{"historyRecords":5,"edgeCount":10,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0600027","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"}}