{"data":{"schemaVersion":"realm.mine-profile.v1","generatedAt":"2026-10-13T11:26:59.401Z","identity":{"mine_id":"2103871","name":"Crusher #43526","status":"Abandoned","status_date":"2019-02-20","mine_type":"Surface","coal_metal":"M","commodity":"Construction Sand and Gravel","state":"MN","county":"Beltrami","nearest_town":"Bemidji","operator_id":"0051129","operator_name":"Knife River Materials","controller_id":"0176802","controller_name":"Knife River Corporation","district":"M4","office":"Duluth District","employees":0,"latitude":null,"longitude":null},"coverage":{"contributingSources":8,"registeredSources":20,"sourceRows":44},"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":"2103871","name":"Crusher #43526"},"operator":{"type":"operator","id":"0051129","name":"Knife River Materials"},"controller":{"type":"controller","id":"0176802","name":"Knife River Corporation"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M09717","name":"MDU Resources Group Inc"},"object":{"type":"mine","id":"2103871","name":"Crusher #43526"},"validFrom":"2002-03-14","validTo":"2023-05-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2103871|M09717|2002-03-14|2023-05-31"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0051129","name":"Knife River Materials"},"object":{"type":"mine","id":"2103871","name":"Crusher #43526"},"validFrom":"2016-02-08","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2103871|0051129|2016-02-08|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M09717","name":"MDU Resources Group Inc"},"object":{"type":"operator","id":"0051129","name":"Knife River Materials"},"validFrom":"2016-02-08","validTo":"2023-05-31","current":false,"derived":true,"evidenceMineId":"2103871","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2103871|0051129|2016-02-08|M09717|2002-03-14|147274"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0176802","name":"Knife River Corporation"},"object":{"type":"mine","id":"2103871","name":"Crusher #43526"},"validFrom":"2023-06-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2103871|0176802|2023-06-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0176802","name":"Knife River Corporation"},"object":{"type":"operator","id":"0051129","name":"Knife River Materials"},"validFrom":"2023-06-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"2103871","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2103871|0051129|2016-02-08|0176802|2023-06-01|37771"}}],"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":"2019-02-20","lastDate":"2019-02-20","metrics":{},"periods":{},"recentRecords":[]},{"id":"msha-assessed-violations","name":"Assessed Violations","domains":["compliance","legal"],"products":["penalty lifecycle","paid and outstanding amounts","assessment aging"],"rowCount":2,"firstDate":"2016-08-16","lastDate":"2018-08-07","metrics":{"ss":0,"delinquent":1,"recentRows":0,"paidPenalty":232,"proposedPenalty":232,"currentAssessment":232},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"2458184","VIOLATION_NO":"9384433","ISSUE_DT":"08/07/2018","CFR_STANDARD_CD":"56.18002(b)","SIG_SUB_IND":"N","CITATION_TYPE_CD":"Citation","PROPOSED_PENALTY_AMT":"118.00","CURRENT_ASSESSMENT_AMT":"118.00","ASSESS_CASE_STATUS_CD":"Closed","sourceDate":"2018-08-07"},{"SOURCE_ROW_NUMBER":"2396490","VIOLATION_NO":"8946207","ISSUE_DT":"08/16/2016","CFR_STANDARD_CD":"56.12004","SIG_SUB_IND":"N","CITATION_TYPE_CD":"Citation","PROPOSED_PENALTY_AMT":"114.00","CURRENT_ASSESSMENT_AMT":"114.00","ASSESS_CASE_STATUS_CD":"Closed","sourceDate":"2016-08-16"}]},{"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":"2016-02-08","lastDate":"2016-02-08","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":3,"firstDate":"2016-08-16","lastDate":"2018-08-07","metrics":{"inspectors":3,"recentRows":0,"onSiteHours":9,"inspectionHours":15,"inspectionSamples":0},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"288197","EVENT_NO":"6747238","INSPECTION_BEGIN_DT":"08/07/2018","INSPECTION_END_DT":"08/08/2018","ACTIVITY_CODE":"E01","ACTIVITY":"Regular Safety and Health Inspection","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"6.25","SUM_TOTAL_ON_SITE_HOURS":"3.75","sourceDate":"2018-08-07"},{"SOURCE_ROW_NUMBER":"1113447","EVENT_NO":"6710752","INSPECTION_BEGIN_DT":"07/25/2017","INSPECTION_END_DT":"07/26/2017","ACTIVITY_CODE":"E01","ACTIVITY":"Regular Safety and Health Inspection","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"4.25","SUM_TOTAL_ON_SITE_HOURS":"3","sourceDate":"2017-07-25"},{"SOURCE_ROW_NUMBER":"657415","EVENT_NO":"6710273","INSPECTION_BEGIN_DT":"08/16/2016","INSPECTION_END_DT":"08/17/2016","ACTIVITY_CODE":"E01","ACTIVITY":"Regular Safety and Health Inspection","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"4.5","SUM_TOTAL_ON_SITE_HOURS":"2.25","sourceDate":"2016-08-16"}]},{"id":"msha-mine-production-quarterly","name":"Mine Employment and Production — Quarterly","domains":["production","safety","compliance"],"products":["production trend","employee hours","rate denominators","seasonality"],"rowCount":26,"firstDate":null,"lastDate":null,"metrics":{},"periods":{"2019-Q1":{"hours":2,"employees":1,"production":0},"2018-Q4":{"hours":955,"employees":4,"production":0},"2018-Q3":{"hours":2450,"employees":5,"production":0},"2018-Q2":{"hours":1250,"employees":4,"production":0},"2018-Q1":{"hours":2,"employees":1,"production":0},"2017-Q4":{"hours":216,"employees":3,"production":0},"2017-Q3":{"hours":2317,"employees":6,"production":0},"2017-Q2":{"hours":2556,"employees":6,"production":0},"2017-Q1":{"hours":54,"employees":5,"production":0},"2016-Q4":{"hours":933,"employees":5,"production":0},"2016-Q3":{"hours":1802,"employees":5,"production":0},"2016-Q2":{"hours":3379,"employees":6,"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":7,"firstDate":null,"lastDate":null,"metrics":{},"periods":{"2016":{"hours":6168,"employees":5,"production":0},"2017":{"hours":5143,"employees":5,"production":0},"2018":{"hours":4657,"employees":4,"production":0},"2019":{"hours":2,"employees":1,"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-violations","name":"Violations","domains":["compliance","safety","legal"],"products":["citation and order record","condition text","Title 30 linkage","abatement patterns"],"rowCount":2,"firstDate":"2016-08-16","lastDate":"2018-08-07","metrics":{"ss":0,"amountDue":232,"contested":0,"amountPaid":232,"recentRows":0,"section104d":0,"unterminated":0,"proposedPenalty":232},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"1386615","VIOLATION_NO":"9384433","VIOLATION_ISSUE_DT":"08/07/2018","SIG_SUB":"N","PART_SECTION":"56.18002(b)","CIT_ORD_SAFE":"Citation","LIKELIHOOD":"NoLikelihood","INJ_ILLNESS":"NoLostDays","NO_AFFECTED":"0","NEGLIGENCE":"NoNegligence","TERMINATION_DT":"08/07/2018","PROPOSED_PENALTY":"118","AMOUNT_DUE":"118","AMOUNT_PAID":"118","CONTESTED_IND":"N","sourceDate":"2018-08-07"},{"SOURCE_ROW_NUMBER":"1386616","VIOLATION_NO":"8946207","VIOLATION_ISSUE_DT":"08/16/2016","SIG_SUB":"N","PART_SECTION":"56.12004","CIT_ORD_SAFE":"Citation","LIKELIHOOD":"Unlikely","INJ_ILLNESS":"LostDays","NO_AFFECTED":"1","NEGLIGENCE":"ModNegligence","TERMINATION_DT":"08/16/2016","PROPOSED_PENALTY":"114","AMOUNT_DUE":"114","AMOUNT_PAID":"114","CONTESTED_IND":"N","sourceDate":"2016-08-16"}]}],"safety":{"href":"/api/v1/mines/2103871/safety","description":"Full-period safety series, top CFR sections and paginated activity. Requires PostgreSQL."},"silica":{"href":"/api/v1/mines/2103871/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":[{"chapter":"I","heading":"Examination of working places.","officialUrl":"https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-Q/section-56.18002","part":"56","subchapter":"K","subpart":"Q","id":"56.18002","citation":"30 CFR 56.18002","chapterHeading":"CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","subchapterHeading":"SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH","partHeading":"PART 56—SAFETY AND HEALTH STANDARDS—SURFACE METAL AND NONMETAL MINES","subpartHeading":"","text":null,"occurrenceCount":1},{"chapter":"I","heading":"Electrical conductors.","officialUrl":"https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12004","part":"56","subchapter":"K","subpart":"K","id":"56.12004","citation":"30 CFR 56.12004","chapterHeading":"CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","subchapterHeading":"SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH","partHeading":"PART 56—SAFETY AND HEALTH STANDARDS—SURFACE METAL AND NONMETAL MINES","subpartHeading":"","text":null,"occurrenceCount":1}],"fullCorpus":"/data/title30-sections.json"}}},"meta":{"representation":"json","mineId":"2103871","dataSource":"postgres","snapshotId":"2026-10-13T11:19:05.459773+00:00","completedAt":"2026-10-13T11:26:59.401Z","sourceCount":20,"totalRows":17906804}}