{"data":{"schemaVersion":"realm.mine-profile.v1","generatedAt":"2026-10-13T11:26:59.401Z","identity":{"mine_id":"4801812","name":"2004 Cedar Rapids Impactor","status":"Temporarily Idled","status_date":"2025-02-04","mine_type":"Surface","coal_metal":"M","commodity":"Construction Sand and Gravel","state":"WY","county":"Campbell","nearest_town":"Gillette","operator_id":"L18624","operator_name":"Melgaard Construction","controller_id":"0151381","controller_name":"John E  Melgaard Jr","district":"C09","office":"Gillette WY Field Office","employees":4,"latitude":44.261667,"longitude":-105.495},"coverage":{"contributingSources":8,"registeredSources":20,"sourceRows":41},"relationships":{"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":"2026-10-13T11:19:05.459773+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":"4801812","name":"2004 Cedar Rapids Impactor"},"operator":{"type":"operator","id":"L18624","name":"Melgaard Construction"},"controller":{"type":"controller","id":"0151381","name":"John E  Melgaard Jr"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M14337","name":"John E  Melgaard Sr."},"object":{"type":"mine","id":"4801812","name":"2004 Cedar Rapids Impactor"},"validFrom":"2001-09-01","validTo":"2018-09-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4801812|M14337|2001-09-01|2018-09-30"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L18624","name":"Melgaard Construction"},"object":{"type":"mine","id":"4801812","name":"2004 Cedar Rapids Impactor"},"validFrom":"2018-05-29","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4801812|L18624|2018-05-29|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M14337","name":"John E  Melgaard Sr."},"object":{"type":"operator","id":"L18624","name":"Melgaard Construction"},"validFrom":"2018-05-29","validTo":"2018-09-30","current":false,"derived":true,"evidenceMineId":"4801812","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4801812|L18624|2018-05-29|M14337|2001-09-01|157955"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0151381","name":"John E  Melgaard Jr"},"object":{"type":"mine","id":"4801812","name":"2004 Cedar Rapids Impactor"},"validFrom":"2018-10-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4801812|0151381|2018-10-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0151381","name":"John E  Melgaard Jr"},"object":{"type":"operator","id":"L18624","name":"Melgaard Construction"},"validFrom":"2018-10-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"4801812","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4801812|L18624|2018-05-29|0151381|2018-10-01|31265"}}],"coverage":{"historyRecords":2,"edgeCount":5,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"sources":[{"id":"msha-addresses","name":"Addresses of Record","domains":["identity","logistics"],"products":["entity resolution","address history","facility geocoding"],"rowCount":1,"firstDate":"2025-02-04","lastDate":"2025-02-04","metrics":{},"periods":{},"recentRecords":[]},{"id":"msha-area-samples","name":"Metal and Nonmetal Area Samples","domains":["health","safety"],"products":["area contaminant trends","result-to-standard context","sampling recency"],"rowCount":1,"firstDate":"2022-04-22","lastDate":"2022-04-22","metrics":{"recentRows":1,"actionTaken":1,"concentrationTotal":0},"periods":{},"recentRecords":[]},{"id":"msha-controller-operator-history","name":"Controller and Operator History","domains":["identity","compliance"],"products":["historical ownership attribution","operator transitions","valid-time joins"],"rowCount":2,"firstDate":"2018-05-29","lastDate":"2018-05-29","metrics":{"recentRows":0,"currentOperatorTenures":2,"completedOperatorTenures":0},"periods":{},"recentRecords":[]},{"id":"msha-inspections","name":"Inspections","domains":["safety","compliance"],"products":["inspection mix","on-site hours","event context","citation rate denominator"],"rowCount":7,"firstDate":"2020-10-07","lastDate":"2026-04-21","metrics":{"inspectors":7,"recentRows":6,"onSiteHours":14.75,"inspectionHours":34.25,"inspectionSamples":0},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"63942","EVENT_NO":"F035A36","INSPECTION_BEGIN_DT":"04/21/2026","INSPECTION_END_DT":"04/21/2026","ACTIVITY_CODE":"E28","ACTIVITY":"Mine Idle Activity","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"8","SUM_TOTAL_ON_SITE_HOURS":".25","sourceDate":"2026-04-21"},{"SOURCE_ROW_NUMBER":"876575","EVENT_NO":"6469062","INSPECTION_BEGIN_DT":"05/22/2024","INSPECTION_END_DT":"05/22/2024","ACTIVITY_CODE":"E17","ACTIVITY":"Special Emphasis Programs","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"3","SUM_TOTAL_ON_SITE_HOURS":"1","sourceDate":"2024-05-22"},{"SOURCE_ROW_NUMBER":"938354","EVENT_NO":"6469013","INSPECTION_BEGIN_DT":"09/26/2023","INSPECTION_END_DT":"09/27/2023","ACTIVITY_CODE":"E28","ACTIVITY":"Mine Idle Activity","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"1","SUM_TOTAL_ON_SITE_HOURS":".5","sourceDate":"2023-09-26"},{"SOURCE_ROW_NUMBER":"881335","EVENT_NO":"6855881","INSPECTION_BEGIN_DT":"04/22/2022","INSPECTION_END_DT":"04/22/2022","ACTIVITY_CODE":"E04","ACTIVITY":"Verbal Hazard Complaint Inspections","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"7.75","SUM_TOTAL_ON_SITE_HOURS":"6","sourceDate":"2022-04-22"},{"SOURCE_ROW_NUMBER":"467040","EVENT_NO":"6855882","INSPECTION_BEGIN_DT":"04/22/2022","INSPECTION_END_DT":"04/22/2022","ACTIVITY_CODE":"E01","ACTIVITY":"Regular Safety and Health Inspection","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"6","SUM_TOTAL_ON_SITE_HOURS":"4","sourceDate":"2022-04-22"},{"SOURCE_ROW_NUMBER":"371107","EVENT_NO":"6853492","INSPECTION_BEGIN_DT":"04/05/2022","INSPECTION_END_DT":"04/06/2022","ACTIVITY_CODE":"E16","ACTIVITY":"Spot Inspection","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"8","SUM_TOTAL_ON_SITE_HOURS":"3","sourceDate":"2022-04-05"},{"SOURCE_ROW_NUMBER":"340405","EVENT_NO":"6786649","INSPECTION_BEGIN_DT":"10/07/2020","INSPECTION_END_DT":"10/07/2020","ACTIVITY_CODE":"E17","ACTIVITY":"Special Emphasis Programs","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":".5","SUM_TOTAL_ON_SITE_HOURS":"0","sourceDate":"2020-10-07"}]},{"id":"msha-mine-production-quarterly","name":"Mine Employment and Production — Quarterly","domains":["production","safety","compliance"],"products":["production trend","employee hours","rate denominators","seasonality"],"rowCount":24,"firstDate":null,"lastDate":null,"metrics":{},"periods":{"2026-Q2":{"hours":0,"employees":0,"production":0},"2026-Q1":{"hours":0,"employees":0,"production":0},"2025-Q4":{"hours":0,"employees":0,"production":0},"2025-Q3":{"hours":0,"employees":0,"production":0},"2025-Q2":{"hours":0,"employees":0,"production":0},"2025-Q1":{"hours":0,"employees":0,"production":0},"2024-Q4":{"hours":237,"employees":4,"production":0},"2024-Q3":{"hours":1059,"employees":3,"production":0},"2024-Q2":{"hours":3334,"employees":5,"production":0},"2024-Q1":{"hours":0,"employees":0,"production":0},"2023-Q4":{"hours":0,"employees":0,"production":0},"2023-Q2":{"hours":0,"employees":0,"production":0}},"recentRecords":[]},{"id":"msha-mine-production-yearly","name":"Mine Employment and Production — Yearly","domains":["production","safety","compliance"],"products":["annual trend","backfill","quarterly reconciliation"],"rowCount":3,"firstDate":null,"lastDate":null,"metrics":{},"periods":{"2022":{"hours":2974,"employees":5,"production":0},"2024":{"hours":4630,"employees":4,"production":0},"2026":{"hours":0,"employees":0,"production":0}},"recentRecords":[]},{"id":"msha-mines","name":"Mines","domains":["identity","production","logistics"],"products":["mine identity","status","commodity","location","operator and controller"],"rowCount":1,"firstDate":null,"lastDate":null,"metrics":{},"periods":{},"recentRecords":[]},{"id":"msha-personal-health-samples","name":"Metal and Nonmetal Personal Health Samples","domains":["health","safety"],"products":["personal exposure trend","occupation patterns","analyte coverage"],"rowCount":2,"firstDate":"2022-04-22","lastDate":"2022-04-22","metrics":{"recentRows":2,"actionTaken":2,"maxExposureRatio":0,"overExposureLimit":0,"exposureRatioTotal":0},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"260500","EVENT_NO":"6855881","SAMPLE_NO":"000000202201780600","SAMPLE_DATE":"04/22/2022","CONTAMINANT_DESC":"Quartz, respirable, >1% Qtz","CONCENTRATION":"0000.16","EXPOSURE_LIMIT":"0000.00","C_OVER_E":"00.00","JOB_CD_DESC":"Crusher Oper/Worker","ACTION_TAKEN_DESC":"NO ACTION","sourceDate":"2022-04-22"},{"SOURCE_ROW_NUMBER":"260499","EVENT_NO":"6855881","SAMPLE_NO":"000000202201780500","SAMPLE_DATE":"04/22/2022","CONTAMINANT_DESC":"Respirable dust, <.1mg","CONCENTRATION":"0000.00","EXPOSURE_LIMIT":"0000.00","C_OVER_E":"00.00","JOB_CD_DESC":"Front-end Loader Operator","ACTION_TAKEN_DESC":"NO ACTION","sourceDate":"2022-04-22"}]}],"safety":{"href":"/api/v1/mines/4801812/safety","description":"Full-period safety series, top CFR sections and paginated activity. Requires PostgreSQL."},"silica":{"href":"/api/v1/mines/4801812/silica","description":"Dedicated silica records, measurements, sample status and trends. Defaults to the snapshot year; use year=all for history."},"externalContext":{"eia":null,"title30":{"snapshot":{"chapterCount":6,"featuredSectionCount":100,"latestAmendedOn":"2026-08-14","latestIssueDate":"2026-08-14","partCount":206,"sectionCount":5954,"upToDateAsOf":"2026-08-19"},"regulations":[],"fullCorpus":"/data/title30-sections.json"}}},"meta":{"representation":"json","mineId":"4801812","dataSource":"postgres","snapshotId":"2026-10-13T11:19:05.459773+00:00","completedAt":"2026-10-13T11:26:59.401Z","sourceCount":20,"totalRows":17906804}}