{"data":{"schemaVersion":"realm.mine-profile.v1","generatedAt":"2026-10-13T11:26:59.401Z","identity":{"mine_id":"4703125","name":"PLANT #41","status":"Abandoned","status_date":"2004-10-20","mine_type":"Surface","coal_metal":"M","commodity":"Crushed, Broken Limestone NEC","state":"WI","county":"Monroe","nearest_town":"Rochester, MN","operator_id":"L16472","operator_name":"Milestone Materials Division Mathy Construction","controller_id":"M00893","controller_name":"Mathy Construction Company","district":"M4","office":"Duluth District","employees":0,"latitude":null,"longitude":null},"coverage":{"contributingSources":10,"registeredSources":20,"sourceRows":58},"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":"4703125","name":"PLANT #41"},"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":"4703125","name":"PLANT #41"},"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":"4703125|M00893|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L16472","name":"Milestone Materials Div/Mathy Construction Co"},"object":{"type":"mine","id":"4703125","name":"PLANT #41"},"validFrom":"1997-10-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703125|L16472|1997-10-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00893","name":"Mathy Construction Company"},"object":{"type":"operator","id":"L16472","name":"Milestone Materials Div/Mathy Construction Co"},"validFrom":"1997-10-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"4703125","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4703125|L16472|1997-10-01|M00893|1950-01-01|115733"}}],"coverage":{"historyRecords":1,"edgeCount":3,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"sources":[{"id":"msha-accidents","name":"Accident, Injuries, and Illnesses","domains":["safety","contractors"],"products":["incident trends","severity rates","equipment patterns","peer denominators"],"rowCount":6,"firstDate":"2000-06-28","lastDate":"2002-05-08","metrics":{"daysLost":67,"injuries":6,"fatalities":0,"recentRows":0,"restrictedDays":11,"contractorRecords":0},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"115758","DOCUMENT_NO":"220021680053","ACCIDENT_DT":"05/08/2002","DEGREE_INJURY":"DAYS AWAY FROM WORK ONLY","CLASSIFICATION":"HANDLING OF MATERIALS","ACCIDENT_TYPE":"Struck by falling object","OCCUPATION":"Backhoe operator, Trackhoe operator, Crane operator","NO_INJURIES":"1","DAYS_LOST":"65","NARRATIVE":"EE AND A LOADER OPERATOR WERE REPLACING A GUARD ON THE PRIMARY THAT HAD BEEN REMOVED FOR MAINTENANCE. WEIGHING APPROX 150 LBS THE GUARD WAS BEING LIFTED BY A CHAIN ATTACHED TO A LOADER BUCKET. THE CHAIN HOOK WAS USED TO ATTACH THE GUARD. THEGUARD SLIPPED FROM THE HOOK, FELL TWO FT AND STRUCK EE'S FOOT.","sourceDate":"2002-05-08"},{"SOURCE_ROW_NUMBER":"206279","DOCUMENT_NO":"220013040018","ACCIDENT_DT":"08/10/2001","DEGREE_INJURY":"DAYS RESTRICTED ACTIVITY ONLY","CLASSIFICATION":"HANDLING OF MATERIALS","ACCIDENT_TYPE":"Over-exertion NEC","OCCUPATION":"Maintenance man, Mechanic,  Repair/Serviceman, Boilermaker, Fueler, Tire tech, Field service tech","NO_INJURIES":"1","NARRATIVE":"WHEN WORKING ON A PIECE OF EQUIPMENT EE'S KNEE POPPED WHEN HE STOOD UP.","sourceDate":"2001-08-10"},{"SOURCE_ROW_NUMBER":"180510","DOCUMENT_NO":"220013040021","ACCIDENT_DT":"08/01/2001","DEGREE_INJURY":"DAYS RESTRICTED ACTIVITY ONLY","CLASSIFICATION":"SLIP OR FALL OF PERSON","ACCIDENT_TYPE":"Over-exertion NEC","OCCUPATION":"Front-end loader, Scraper-loader operator, Pan operator, Payloader, Scraper rig operator","NO_INJURIES":"1","NARRATIVE":"EE'S FEET SLIPPED OFF LOADER FRAME WHILE CHANGING HYDRAULIC HOSE, CATCHING HIS LT ARM ON THE HYDRAULIC VALVE BRACKET CAUSING THE INJURY TO HIS ARM.","sourceDate":"2001-08-01"},{"SOURCE_ROW_NUMBER":"132957","DOCUMENT_NO":"220012010047","ACCIDENT_DT":"07/06/2001","DEGREE_INJURY":"DAYS RESTRICTED ACTIVITY ONLY","CLASSIFICATION":"MACHINERY","ACCIDENT_TYPE":"Struck by flying object","OCCUPATION":"Warehouseman, Bagger, Palletizer/Stacker, Store keeper, Packager, Fabricator, Cleaning plant operator","NO_INJURIES":"1","NARRATIVE":"EE WAS LOOKING DOWN IN BREAKER WHEN A ROCK FLEW OUT AND STRUCK HIS WRIST.","sourceDate":"2001-07-06"},{"SOURCE_ROW_NUMBER":"38570","DOCUMENT_NO":"220002930030","ACCIDENT_DT":"09/21/2000","DEGREE_INJURY":"DYS AWY FRM WRK & RESTRCTD ACT","CLASSIFICATION":"SLIP OR FALL OF PERSON","ACCIDENT_TYPE":"Over-exertion NEC","OCCUPATION":"Front-end loader, Scraper-loader operator, Pan operator, Payloader, Scraper rig operator","NO_INJURIES":"1","DAYS_LOST":"1","NARRATIVE":"EMPLOYEE WAS ON THE CATWALK OF THE SECONDARY. HEWENT TO STEP ON THE LOWER CATWALK AND HIS FOOT GAVE OUT AND ROLLED TO THE LEFT.","sourceDate":"2000-09-21"},{"SOURCE_ROW_NUMBER":"90078","DOCUMENT_NO":"220002020011","ACCIDENT_DT":"06/28/2000","DEGREE_INJURY":"DAYS AWAY FROM WORK ONLY","CLASSIFICATION":"HANDTOOLS (NONPOWERED)","ACCIDENT_TYPE":"Struck against stationary object","OCCUPATION":"Miner, NEC","NO_INJURIES":"1","DAYS_LOST":"1","NARRATIVE":"WHILE SHOVELING EE STRUCK HIS FINGER AGAINST A PIECE OF METAL AT THE ROLL PLANT.","sourceDate":"2000-06-28"}]},{"id":"msha-addresses","name":"Addresses of Record","domains":["identity","logistics"],"products":["entity resolution","address history","facility geocoding"],"rowCount":1,"firstDate":"2004-10-20","lastDate":"2004-10-20","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":"2002-09-17","lastDate":"2002-09-17","metrics":{"ss":0,"delinquent":2,"recentRows":0,"paidPenalty":110,"proposedPenalty":110,"currentAssessment":110},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"321791","VIOLATION_NO":"6136474","ISSUE_DT":"09/17/2002","CFR_STANDARD_CD":"56.14130(i)","SIG_SUB_IND":"N","CITATION_TYPE_CD":"Citation","PROPOSED_PENALTY_AMT":"55.00","CURRENT_ASSESSMENT_AMT":"55.00","ASSESS_CASE_STATUS_CD":"Closed","sourceDate":"2002-09-17"},{"SOURCE_ROW_NUMBER":"321790","VIOLATION_NO":"6136473","ISSUE_DT":"09/17/2002","CFR_STANDARD_CD":"56.20003(c)","SIG_SUB_IND":"N","CITATION_TYPE_CD":"Citation","PROPOSED_PENALTY_AMT":"55.00","CURRENT_ASSESSMENT_AMT":"55.00","ASSESS_CASE_STATUS_CD":"Closed","sourceDate":"2002-09-17"}]},{"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":"1997-10-01","lastDate":"1997-10-01","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":6,"firstDate":"2000-06-27","lastDate":"2004-02-19","metrics":{"inspectors":8,"recentRows":0,"onSiteHours":60,"inspectionHours":99,"inspectionSamples":0},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"518964","EVENT_NO":"0977729","INSPECTION_BEGIN_DT":"02/19/2004","INSPECTION_END_DT":"02/19/2004","ACTIVITY_CODE":"16","ACTIVITY":"PART 50 AUDIT","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"8","SUM_TOTAL_ON_SITE_HOURS":"4","sourceDate":"2004-02-19"},{"SOURCE_ROW_NUMBER":"151705","EVENT_NO":"0969249","INSPECTION_BEGIN_DT":"10/17/2002","INSPECTION_END_DT":"10/17/2002","ACTIVITY_CODE":"46","ACTIVITY":"SPECIAL ENFORCEMENT 4","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"2","SUM_TOTAL_ON_SITE_HOURS":"1","sourceDate":"2002-10-17"},{"SOURCE_ROW_NUMBER":"1128026","EVENT_NO":"0969228","INSPECTION_BEGIN_DT":"09/17/2002","INSPECTION_END_DT":"09/18/2002","ACTIVITY_CODE":"01","ACTIVITY":"REGULAR INSPECTION","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"13","SUM_TOTAL_ON_SITE_HOURS":"8","sourceDate":"2002-09-17"},{"SOURCE_ROW_NUMBER":"1078018","EVENT_NO":"0812996","INSPECTION_BEGIN_DT":"03/28/2001","INSPECTION_END_DT":"03/29/2001","ACTIVITY_CODE":"37","ACTIVITY":"MISCELLANEOUS INSPECTION/INVESTIGATION","NBR_INSPECTOR":"2","SUM_TOTAL_INSP_HOURS":"54","SUM_TOTAL_ON_SITE_HOURS":"38","sourceDate":"2001-03-28"},{"SOURCE_ROW_NUMBER":"701395","EVENT_NO":"0722537","INSPECTION_BEGIN_DT":"10/03/2000","INSPECTION_END_DT":"10/05/2000","ACTIVITY_CODE":"01","ACTIVITY":"REGULAR INSPECTION","NBR_INSPECTOR":"2","SUM_TOTAL_INSP_HOURS":"12","SUM_TOTAL_ON_SITE_HOURS":"4","sourceDate":"2000-10-03"},{"SOURCE_ROW_NUMBER":"343733","EVENT_NO":"0746354","INSPECTION_BEGIN_DT":"06/27/2000","INSPECTION_END_DT":"06/27/2000","ACTIVITY_CODE":"01","ACTIVITY":"REGULAR INSPECTION","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"10","SUM_TOTAL_ON_SITE_HOURS":"5","sourceDate":"2000-06-27"}]},{"id":"msha-mine-production-quarterly","name":"Mine Employment and Production — Quarterly","domains":["production","safety","compliance"],"products":["production trend","employee hours","rate denominators","seasonality"],"rowCount":28,"firstDate":null,"lastDate":null,"metrics":{},"periods":{"2004-Q2":{"hours":1,"employees":1,"production":0},"2004-Q1":{"hours":1,"employees":1,"production":0},"2003-Q4":{"hours":1,"employees":1,"production":0},"2003-Q3":{"hours":2046,"employees":3,"production":0},"2003-Q2":{"hours":0,"employees":0,"production":0},"2003-Q1":{"hours":0,"employees":0,"production":0},"2002-Q4":{"hours":7,"employees":1,"production":0},"2002-Q3":{"hours":1217,"employees":2,"production":0},"2002-Q2":{"hours":12,"employees":1,"production":0},"2002-Q1":{"hours":1,"employees":1,"production":0},"2001-Q4":{"hours":9067,"employees":12,"production":0},"2001-Q3":{"hours":6275,"employees":8,"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":8,"firstDate":null,"lastDate":null,"metrics":{},"periods":{"2000":{"hours":18054,"employees":9,"production":0},"2001":{"hours":27391,"employees":9,"production":0},"2002":{"hours":1237,"employees":2,"production":0},"2003":{"hours":2047,"employees":4,"production":0},"2004":{"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-personal-health-samples","name":"Metal and Nonmetal Personal Health Samples","domains":["health","safety"],"products":["personal exposure trend","occupation patterns","analyte coverage"],"rowCount":3,"firstDate":"2001-03-28","lastDate":"2001-03-28","metrics":{"recentRows":0,"actionTaken":3,"maxExposureRatio":0.56,"overExposureLimit":0,"exposureRatioTotal":0.81},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"5018","EVENT_NO":"0812996","SAMPLE_NO":"000000200101176600","SAMPLE_DATE":"03/28/2001","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":"2001-03-28"},{"SOURCE_ROW_NUMBER":"5017","EVENT_NO":"0812996","SAMPLE_NO":"000000200101176500","SAMPLE_DATE":"03/28/2001","CONTAMINANT_DESC":"Quartz, respirable, >1% Qtz","CONCENTRATION":"0000.40","EXPOSURE_LIMIT":"0001.59","C_OVER_E":"00.25","JOB_CD_DESC":"Front-end Loader Operator","ACTION_TAKEN_DESC":"NO ACTION","sourceDate":"2001-03-28"},{"SOURCE_ROW_NUMBER":"5016","EVENT_NO":"0812996","SAMPLE_NO":"000000200101176400","SAMPLE_DATE":"03/28/2001","CONTAMINANT_DESC":"Nuisance dust, total, <1% Qtz","CONCENTRATION":"0005.62","EXPOSURE_LIMIT":"0010.00","C_OVER_E":"00.56","JOB_CD_DESC":"Crusher Oper/Worker","ACTION_TAKEN_DESC":"NO ACTION","sourceDate":"2001-03-28"}]},{"id":"msha-violations","name":"Violations","domains":["compliance","safety","legal"],"products":["citation and order record","condition text","Title 30 linkage","abatement patterns"],"rowCount":2,"firstDate":"2002-09-17","lastDate":"2002-09-17","metrics":{"ss":0,"amountDue":110,"contested":0,"amountPaid":110,"recentRows":0,"section104d":0,"unterminated":0,"proposedPenalty":110},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"3020005","VIOLATION_NO":"6136474","VIOLATION_ISSUE_DT":"09/17/2002","SIG_SUB":"N","PART_SECTION":"56.14130(i)","CIT_ORD_SAFE":"Citation","LIKELIHOOD":"Unlikely","INJ_ILLNESS":"LostDays","NO_AFFECTED":"1","NEGLIGENCE":"ModNegligence","TERMINATION_DT":"09/18/2002","PROPOSED_PENALTY":"55","AMOUNT_DUE":"55","AMOUNT_PAID":"55","CONTESTED_IND":"N","sourceDate":"2002-09-17"},{"SOURCE_ROW_NUMBER":"3020004","VIOLATION_NO":"6136473","VIOLATION_ISSUE_DT":"09/17/2002","SIG_SUB":"N","PART_SECTION":"56.20003(c)","CIT_ORD_SAFE":"Citation","LIKELIHOOD":"Unlikely","INJ_ILLNESS":"LostDays","NO_AFFECTED":"1","NEGLIGENCE":"ModNegligence","TERMINATION_DT":"09/17/2002","PROPOSED_PENALTY":"55","AMOUNT_DUE":"55","AMOUNT_PAID":"55","CONTESTED_IND":"N","sourceDate":"2002-09-17"}]}],"safety":{"href":"/api/v1/mines/4703125/safety","description":"Full-period safety series, top CFR sections and paginated activity. Requires PostgreSQL."},"silica":{"href":"/api/v1/mines/4703125/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":"Roll-over protective structures (ROPS) and seat belts.","officialUrl":"https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14130","part":"56","subchapter":"K","subpart":"M","id":"56.14130","citation":"30 CFR 56.14130","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":"Housekeeping.","officialUrl":"https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-S/section-56.20003","part":"56","subchapter":"K","subpart":"S","id":"56.20003","citation":"30 CFR 56.20003","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":"4703125","dataSource":"postgres","snapshotId":"2026-10-13T11:19:05.459773+00:00","completedAt":"2026-10-13T11:26:59.401Z","sourceCount":20,"totalRows":17906804}}