{"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":"2501177","name":"M&H Sand &Gravel LLC"},"operator":{"type":"operator","id":"0204873","name":"M&H Sand&Gravel LLC"},"controller":{"type":"controller","id":"0195460","name":"Lyndsey K Hasenkamp; Kandice Karen McCoy; Taron L Hasenkamp; Roger  McCo"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-18T09:31:49.615908+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L15759","name":"Gary Backhaus Gravel"},"object":{"type":"mine","id":"2501177","name":"M&H Sand &Gravel LLC"},"validFrom":"1998-04-01","validTo":"2021-06-15","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"2501177|L15759|1998-04-01|2021-06-15"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M12011","name":"Gary  Backhaus"},"object":{"type":"mine","id":"2501177","name":"M&H Sand &Gravel LLC"},"validFrom":"1998-04-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"2501177|M12011|1998-04-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M12011","name":"Gary  Backhaus"},"object":{"type":"operator","id":"L15759","name":"Gary Backhaus Gravel"},"validFrom":"1998-04-01","validTo":"2021-06-15","current":false,"derived":true,"evidenceMineId":"2501177","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"2501177|L15759|1998-04-01|M12011|1998-04-01|152964"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0177013","name":"Gary Backhaus Gravel LLC"},"object":{"type":"mine","id":"2501177","name":"M&H Sand &Gravel LLC"},"validFrom":"2021-06-16","validTo":"2025-07-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"2501177|0177013|2021-06-16|2025-07-22"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M12011","name":"Gary  Backhaus"},"object":{"type":"mine","id":"2501177","name":"M&H Sand &Gravel LLC"},"validFrom":"2021-06-16","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"2501177|M12011|2021-06-16|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M12011","name":"Gary  Backhaus"},"object":{"type":"operator","id":"0177013","name":"Gary Backhaus Gravel LLC"},"validFrom":"2021-06-16","validTo":"2025-07-22","current":false,"derived":true,"evidenceMineId":"2501177","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"2501177|0177013|2021-06-16|M12011|2021-06-16|152965"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0204873","name":"M&H Sand&Gravel LLC"},"object":{"type":"mine","id":"2501177","name":"M&H Sand &Gravel LLC"},"validFrom":"2025-07-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"2501177|0204873|2025-07-23|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0195460","name":"Taron L Hasenkamp et al"},"object":{"type":"mine","id":"2501177","name":"M&H Sand &Gravel LLC"},"validFrom":"2025-07-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"2501177|0195460|2025-07-23|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0195460","name":"Taron L Hasenkamp et al"},"object":{"type":"operator","id":"0204873","name":"M&H Sand&Gravel LLC"},"validFrom":"2025-07-23","validTo":null,"current":true,"derived":true,"evidenceMineId":"2501177","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"2501177|0204873|2025-07-23|0195460|2025-07-23|41773"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0195460","name":"Kandice Karen McCoy et al"},"object":{"type":"operator","id":"0204873","name":"M&H Sand&Gravel LLC"},"validFrom":"2025-07-23","validTo":null,"current":true,"derived":true,"evidenceMineId":"2501177","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"2501177|0204873|2025-07-23|0195460|2025-07-23|41774"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0195460","name":"Roger  McCoy et al"},"object":{"type":"operator","id":"0204873","name":"M&H Sand&Gravel LLC"},"validFrom":"2025-07-23","validTo":null,"current":true,"derived":true,"evidenceMineId":"2501177","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"2501177|0204873|2025-07-23|0195460|2025-07-23|41775"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0195460","name":"Lyndsey K Hasenkamp et al"},"object":{"type":"operator","id":"0204873","name":"M&H Sand&Gravel LLC"},"validFrom":"2025-07-23","validTo":null,"current":true,"derived":true,"evidenceMineId":"2501177","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"2501177|0204873|2025-07-23|0195460|2025-07-23|41776"}}],"coverage":{"historyRecords":6,"edgeCount":12,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"2501177","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"}}