{"data":{"schemaVersion":"realm.mine-profile.v1","generatedAt":"2026-10-13T11:26:59.401Z","identity":{"mine_id":"4703042","name":"Plant #50","status":"Intermittent","status_date":"1994-10-03","mine_type":"Surface","coal_metal":"M","commodity":"Construction Sand and Gravel","state":"WI","county":"La Crosse","nearest_town":"Onalaska","operator_id":"L16472","operator_name":"Milestone Materials Division Mathy Construction","controller_id":"M00893","controller_name":"Mathy Construction Company","district":"M4","office":"Duluth MN Field Office","employees":3,"latitude":43.896389,"longitude":-91.225},"coverage":{"contributingSources":9,"registeredSources":20,"sourceRows":265},"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":"4703042","name":"Plant #50"},"operator":{"type":"operator","id":"L16472","name":"Milestone Materials Division Mathy Construction"},"controller":{"type":"controller","id":"M00893","name":"Mathy Construction Company"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00893","name":"Mathy Construction Company"},"object":{"type":"mine","id":"4703042","name":"Plant #50"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703042|M00893|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L16472","name":"Milestone Materials Division Mathy Construction"},"object":{"type":"mine","id":"4703042","name":"Plant #50"},"validFrom":"1994-10-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703042|L16472|1994-10-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00893","name":"Mathy Construction Company"},"object":{"type":"operator","id":"L16472","name":"Milestone Materials Division Mathy Construction"},"validFrom":"1994-10-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"4703042","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703042|L16472|1994-10-01|M00893|1950-01-01|115726"}}],"coverage":{"historyRecords":1,"edgeCount":3,"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":"1994-10-03","lastDate":"1994-10-03","metrics":{},"periods":{},"recentRecords":[]},{"id":"msha-assessed-violations","name":"Assessed Violations","domains":["compliance","legal"],"products":["penalty lifecycle","paid and outstanding amounts","assessment aging"],"rowCount":1,"firstDate":"2010-07-21","lastDate":"2010-07-21","metrics":{"ss":0,"delinquent":1,"recentRows":0,"paidPenalty":100,"proposedPenalty":100,"currentAssessment":100},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"2078177","VIOLATION_NO":"6556150","ISSUE_DT":"07/21/2010","CFR_STANDARD_CD":"56.9300(b)","SIG_SUB_IND":"N","CITATION_TYPE_CD":"Citation","PROPOSED_PENALTY_AMT":"100.00","CURRENT_ASSESSMENT_AMT":"100.00","ASSESS_CASE_STATUS_CD":"Closed","sourceDate":"2010-07-21"}]},{"id":"msha-controller-operator-history","name":"Controller and Operator History","domains":["identity","compliance"],"products":["historical ownership attribution","operator transitions","valid-time joins"],"rowCount":1,"firstDate":"1994-10-01","lastDate":"1994-10-01","metrics":{"recentRows":0,"currentOperatorTenures":1,"completedOperatorTenures":0},"periods":{},"recentRecords":[]},{"id":"msha-inspections","name":"Inspections","domains":["safety","compliance"],"products":["inspection mix","on-site hours","event context","citation rate denominator"],"rowCount":35,"firstDate":"2000-11-07","lastDate":"2025-10-06","metrics":{"inspectors":35,"recentRows":8,"onSiteHours":97.25,"inspectionHours":241.75,"inspectionSamples":0},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"423283","EVENT_NO":"6906625","INSPECTION_BEGIN_DT":"10/06/2025","INSPECTION_END_DT":"10/06/2025","ACTIVITY_CODE":"E01","ACTIVITY":"Regular Safety and Health Inspection","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"4.25","SUM_TOTAL_ON_SITE_HOURS":"1.25","sourceDate":"2025-10-06"},{"SOURCE_ROW_NUMBER":"302674","EVENT_NO":"F034A4D","INSPECTION_BEGIN_DT":"09/17/2025","INSPECTION_END_DT":"09/17/2025","ACTIVITY_CODE":"E16","ACTIVITY":"Spot Inspection","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"10.5","SUM_TOTAL_ON_SITE_HOURS":"5","sourceDate":"2025-09-17"},{"SOURCE_ROW_NUMBER":"354973","EVENT_NO":"F016D2D","INSPECTION_BEGIN_DT":"05/21/2025","INSPECTION_END_DT":"05/21/2025","ACTIVITY_CODE":"E01","ACTIVITY":"Regular Safety and Health Inspection","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"6.5","SUM_TOTAL_ON_SITE_HOURS":"5","sourceDate":"2025-05-21"},{"SOURCE_ROW_NUMBER":"564465","EVENT_NO":"6952179","INSPECTION_BEGIN_DT":"02/13/2024","INSPECTION_END_DT":"02/13/2024","ACTIVITY_CODE":"E28","ACTIVITY":"Mine Idle Activity","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"1.25","SUM_TOTAL_ON_SITE_HOURS":".75","sourceDate":"2024-02-13"},{"SOURCE_ROW_NUMBER":"986900","EVENT_NO":"6906948","INSPECTION_BEGIN_DT":"08/23/2023","INSPECTION_END_DT":"08/23/2023","ACTIVITY_CODE":"E01","ACTIVITY":"Regular Safety and Health Inspection","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"8.75","SUM_TOTAL_ON_SITE_HOURS":"1.25","sourceDate":"2023-08-23"},{"SOURCE_ROW_NUMBER":"779301","EVENT_NO":"6906937","INSPECTION_BEGIN_DT":"08/14/2023","INSPECTION_END_DT":"08/14/2023","ACTIVITY_CODE":"E28","ACTIVITY":"Mine Idle Activity","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"3.5","SUM_TOTAL_ON_SITE_HOURS":"1","sourceDate":"2023-08-14"},{"SOURCE_ROW_NUMBER":"868894","EVENT_NO":"6901680","INSPECTION_BEGIN_DT":"09/07/2022","INSPECTION_END_DT":"09/07/2022","ACTIVITY_CODE":"E01","ACTIVITY":"Regular Safety and Health Inspection","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"12.5","SUM_TOTAL_ON_SITE_HOURS":"5","sourceDate":"2022-09-07"},{"SOURCE_ROW_NUMBER":"288196","EVENT_NO":"6837517","INSPECTION_BEGIN_DT":"06/14/2021","INSPECTION_END_DT":"06/15/2021","ACTIVITY_CODE":"E01","ACTIVITY":"Regular Safety and Health Inspection","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"8.5","SUM_TOTAL_ON_SITE_HOURS":"7","sourceDate":"2021-06-14"},{"SOURCE_ROW_NUMBER":"158621","EVENT_NO":"6835000","INSPECTION_BEGIN_DT":"07/16/2020","INSPECTION_END_DT":"07/16/2020","ACTIVITY_CODE":"E01","ACTIVITY":"Regular Safety and Health Inspection","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"5.25","SUM_TOTAL_ON_SITE_HOURS":"1","sourceDate":"2020-07-16"},{"SOURCE_ROW_NUMBER":"752963","EVENT_NO":"6837239","INSPECTION_BEGIN_DT":"09/18/2019","INSPECTION_END_DT":"09/18/2019","ACTIVITY_CODE":"E16","ACTIVITY":"Spot Inspection","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"1","SUM_TOTAL_ON_SITE_HOURS":".25","sourceDate":"2019-09-18"},{"SOURCE_ROW_NUMBER":"824759","EVENT_NO":"6837219","INSPECTION_BEGIN_DT":"08/21/2019","INSPECTION_END_DT":"08/21/2019","ACTIVITY_CODE":"E28","ACTIVITY":"Mine Idle Activity","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"2","SUM_TOTAL_ON_SITE_HOURS":".5","sourceDate":"2019-08-21"},{"SOURCE_ROW_NUMBER":"632733","EVENT_NO":"6750234","INSPECTION_BEGIN_DT":"08/08/2018","INSPECTION_END_DT":"08/08/2018","ACTIVITY_CODE":"E28","ACTIVITY":"Mine Idle Activity","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"3.5","SUM_TOTAL_ON_SITE_HOURS":".5","sourceDate":"2018-08-08"}]},{"id":"msha-mine-production-quarterly","name":"Mine Employment and Production — Quarterly","domains":["production","safety","compliance"],"products":["production trend","employee hours","rate denominators","seasonality"],"rowCount":176,"firstDate":null,"lastDate":null,"metrics":{},"periods":{"2026-Q2":{"hours":999,"employees":1,"production":0},"2026-Q1":{"hours":1,"employees":1,"production":0},"2025-Q4":{"hours":344,"employees":1,"production":0},"2025-Q3":{"hours":1265,"employees":2,"production":0},"2025-Q2":{"hours":1147,"employees":2,"production":0},"2025-Q1":{"hours":1,"employees":1,"production":0},"2024-Q4":{"hours":1,"employees":1,"production":0},"2024-Q3":{"hours":1,"employees":1,"production":0},"2024-Q2":{"hours":1,"employees":1,"production":0},"2024-Q1":{"hours":1,"employees":1,"production":0},"2023-Q4":{"hours":1,"employees":1,"production":0},"2023-Q3":{"hours":1100,"employees":1,"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":44,"firstDate":null,"lastDate":null,"metrics":{},"periods":{"2017":{"hours":682,"employees":2,"production":0},"2018":{"hours":311,"employees":2,"production":0},"2019":{"hours":560,"employees":2,"production":0},"2020":{"hours":1229,"employees":1,"production":0},"2021":{"hours":1226,"employees":1,"production":0},"2022":{"hours":1688,"employees":1,"production":0},"2023":{"hours":1103,"employees":2,"production":0},"2024":{"hours":4,"employees":1,"production":0},"2025":{"hours":2757,"employees":3,"production":0},"2026":{"hours":1000,"employees":2,"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":5,"firstDate":"2000-11-08","lastDate":"2025-09-17","metrics":{"recentRows":2,"actionTaken":5,"maxExposureRatio":0,"overExposureLimit":0,"exposureRatioTotal":0},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"294687","EVENT_NO":"F034A4D","SAMPLE_NO":"000000202504054700","SAMPLE_DATE":"09/17/2025","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":"2025-09-17"},{"SOURCE_ROW_NUMBER":"254896","EVENT_NO":"6837517","SAMPLE_NO":"000000202102519600","SAMPLE_DATE":"06/15/2021","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":"2021-06-15"},{"SOURCE_ROW_NUMBER":"145779","EVENT_NO":"6519532","SAMPLE_NO":"000000201009249100","SAMPLE_DATE":"09/29/2010","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":"2010-09-29"},{"SOURCE_ROW_NUMBER":"39716","EVENT_NO":"0977756","SAMPLE_NO":"000000200404112600","SAMPLE_DATE":"05/05/2004","CONTAMINANT_DESC":"Unlisted Particulate, respirable, <1% Qtz","CONCENTRATION":"0000.26","EXPOSURE_LIMIT":"0000.00","C_OVER_E":"00.00","JOB_CD_DESC":"Washer Operator","ACTION_TAKEN_DESC":"NO ACTION","sourceDate":"2004-05-05"},{"SOURCE_ROW_NUMBER":"200948","EVENT_NO":"0812844","SAMPLE_NO":"800000200000269100","SAMPLE_DATE":"11/08/2000","CONTAMINANT_DESC":"Unlisted Particulate, respirable, <1% Qtz","CONCENTRATION":"0000.34","EXPOSURE_LIMIT":"0000.00","C_OVER_E":"00.00","JOB_CD_DESC":"Supervisor, Co. Official","ACTION_TAKEN_DESC":"NO ACTION","sourceDate":"2000-11-08"}]},{"id":"msha-violations","name":"Violations","domains":["compliance","safety","legal"],"products":["citation and order record","condition text","Title 30 linkage","abatement patterns"],"rowCount":1,"firstDate":"2010-07-21","lastDate":"2010-07-21","metrics":{"ss":0,"amountDue":100,"contested":0,"amountPaid":100,"recentRows":0,"section104d":0,"unterminated":0,"proposedPenalty":100},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"3017983","VIOLATION_NO":"6556150","VIOLATION_ISSUE_DT":"07/21/2010","SIG_SUB":"N","PART_SECTION":"56.9300(b)","CIT_ORD_SAFE":"Citation","LIKELIHOOD":"Unlikely","INJ_ILLNESS":"LostDays","NO_AFFECTED":"1","NEGLIGENCE":"ModNegligence","TERMINATION_DT":"07/21/2010","PROPOSED_PENALTY":"100","AMOUNT_DUE":"100","AMOUNT_PAID":"100","CONTESTED_IND":"N","sourceDate":"2010-07-21"}]}],"safety":{"href":"/api/v1/mines/4703042/safety","description":"Full-period safety series, top CFR sections and paginated activity. Requires PostgreSQL."},"silica":{"href":"/api/v1/mines/4703042/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":"Berms or guardrails.","officialUrl":"https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-H/section-56.9300","part":"56","subchapter":"K","subpart":"H","id":"56.9300","citation":"30 CFR 56.9300","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":"4703042","dataSource":"postgres","snapshotId":"2026-10-13T11:19:05.459773+00:00","completedAt":"2026-10-13T11:26:59.401Z","sourceCount":20,"totalRows":17906804}}