ALL STATUSES / CONTROLLER PORTFOLIO

Mathy Construction Company

Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.

MSHA CONTROLLER IDM00893

MINE PORTFOLIO

120 of 120 mines and facilities

2025-01-01 – 2026-10-18. All statuses records; production reporting is not required.

MineLocation / typeCoal · short tonsHours workedViolationsAccident recordsOn-site inspection hours
Grayhawk HP 4002103843 · Intermittent6/8 quarters reportedSt Louis, MNSurface · MSHA: Construction Sand and Gravel03,621209.5
K4002104045 · Intermittent6/8 quarters reportedSt Louis, MNSurface · MSHA: Sand, Common0187002.3
K5002103893 · Intermittent6/8 quarters reportedSt Louis, MNSurface · MSHA: Construction Sand and Gravel04,7344012.0
Plant #124702904 · Intermittent6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC06,7620010.0
Plant #134703241 · Intermittent6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC07,1440012.0
Plant #144703402 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel07,501008.3
Plant #174703405 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel05,039007.3
Plant #184703406 · Intermittent6/8 quarters reportedMarathon, WISurface · MSHA: Construction Sand and Gravel03,5440010.5
Plant #201302134 · Intermittent6/8 quarters reportedDubuque, IASurface · MSHA: Crushed, Broken Limestone NEC03,738206.5
Plant 214703395 · Intermittent6/8 quarters reportedClark, WISurface · MSHA: Crushed, Broken Limestone NEC07,9322012.5
Plant #244703039 · Intermittent6/8 quarters reportedSauk, WISurface · MSHA: Construction Sand and Gravel01,438017.3
Plant #264702928 · Intermittent6/8 quarters reportedMarathon, WISurface · MSHA: Construction Sand and Gravel040,9720229.5
Plant #284703084 · Active6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel018,1921122.0
Plant #294703059 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC017,619008.5
Plant #304702873 · Active6/8 quarters reportedLa Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC014,6763032.0
PLANT #314703213 · Intermittent6/8 quarters reportedWabasha, MNSurface · MSHA: Construction Sand and Gravel022,979119.5
Plant #324702405 · Active6/8 quarters reportedMonroe, WISurface · MSHA: Crushed, Broken Limestone NEC023,6584025.0
Plant #334703160 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel027,1930316.8
Plant #344702646 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel03,5941110.3
Plant #352103087 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel07,198009.8
Plant #362103143 · Intermittent6/8 quarters reportedWinona, MNSurface · MSHA: Construction Sand and Gravel06,464016.3
Plant #372103152 · Intermittent6/8 quarters reportedOlmsted, MNSurface · MSHA: Crushed, Broken Limestone NEC05,566208.3
Plant #382100777 · Active6/8 quarters reportedLa Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC019,3632111.3
Plant #392103088 · Active6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel020,7560113.5
Plant #404703038 · Active6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel04,934008.0
Plant #414701834 · Intermittent6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC0426003.8
Plant #424701724 · Active6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC020,2831019.0
Plant #434700091 · Intermittent6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC020,1830011.0
Plant #444701730 · Active6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC019,6100113.8
Plant #454702874 · Active6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC018,2590118.8
Plant #464703326 · Intermittent6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC013,813107.0
Plant #474703095 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC04,871004.0
Plant #484700201 · Active6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC017,9540013.8
Plant #504703042 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel03,7570011.3
Plant #514703198 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC0428209.3
Plant 524700903 · Intermittent2/8 quarters reportedClark, WISurface · MSHA: Crushed, Broken Limestone NEC02001.5
Plant #534703196 · Active6/8 quarters reportedLa Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC027,5040017.3
Plant #554703194 · Intermittent6/8 quarters reportedJackson, MNSurface · MSHA: Construction Sand and Gravel04,3392010.0
Plant #574703212 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel06,0282012.5
Plant #594703215 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC06,9790022.3
Plant #614703235 · Active6/8 quarters reportedLa Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC021,1343014.8
Plant #642103264 · Active6/8 quarters reportedWabasha, MNSurface · MSHA: Crushed, Broken Limestone NEC019,9314017.3
Plant #664703274 · Active6/8 quarters reportedLa Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC020,6446039.8
Plant #674703304 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel08,7810010.3
Plant #694703307 · Intermittent6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC00000.8
Plant #704703308 · Intermittent6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC014,225018.8
PLANT #714703449 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel04983010.5
Plant #724703283 · Intermittent6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC02,586001.3
Plant #734703466 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel015,6881110.0
Plant #744703465 · Intermittent6/8 quarters reportedBayfield, WISurface · MSHA: Construction Sand and Gravel07,877019.5
Plant #754703305 · Intermittent6/8 quarters reportedRichland, WISurface · MSHA: Construction Sand and Gravel03,925007.0
Plant 764703505 · Active6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel06,298008.3
Plant 774703527 · Intermittent6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel03,891005.0
Plant 784703595 · Intermittent6/8 quarters reportedEau Claire, WISurface · MSHA: Construction Sand and Gravel013,2061011.8
Plant #794703610 · Intermittent6/8 quarters reportedMonroe, WISurface · MSHA: Construction Sand and Gravel05,194008.8
Plant 804703609 · Active6/8 quarters reportedDunn, WISurface · MSHA: Sand, Common025,3821025.5
Plant #814703467 · Active6/8 quarters reportedSt Croix, WISurface · MSHA: Construction Sand and Gravel016,9610016.5
Plant 824703639 · Active6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel022,7321016.0
PLANT 834703640 · Active6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel020,2500011.3
Plant 844703641 · Active6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel020,9010014.3
Plant #854703786 · Active6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC024,0430014.3
Plant #864703452 · Active6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC011,546008.5
Plant 874703663 · Active6/8 quarters reportedLa Crosse, WISurface · MSHA: Construction Sand and Gravel023,7240017.8
Plant #884703080 · Intermittent6/8 quarters reportedDunn, WISurface · MSHA: Construction Sand and Gravel04,0870010.3
Plant #894703086 · Intermittent6/8 quarters reportedClark, WISurface · MSHA: Construction Sand and Gravel02,773005.3
Plant #904703040 · Intermittent6/8 quarters reportedClark, WISurface · MSHA: Construction Sand and Gravel028,137028.5
Plant #914703679 · Active6/8 quarters reportedJackson, WISurface · MSHA: Construction Sand and Gravel015,8821212.3
Plant 934703723 · Intermittent6/8 quarters reportedMonroe, WISurface · MSHA: Sand, Industrial NEC01,910003.3
Plant #944702915 · Intermittent6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC02,3860010.8
Plant #994703726 · Intermittent6/8 quarters reportedSauk, WISurface · MSHA: Crushed, Broken Limestone NEC02,499001.3
Portable Crusher #13503758 · Active6/8 quarters reportedDeschutes, ORSurface · MSHA: Crushed, Broken Stone NEC026,7593031.8
Portable Crusher 33503861 · Intermittent6/8 quarters reportedDeschutes, ORSurface · MSHA: Crushed, Broken Basalt01,166409.0
Wash Plant2103460 · Intermittent6/8 quarters reportedSt Louis, MNSurface · MSHA: Construction Sand and Gravel01,559208.5
ALLIS CHALMER III2100595 · AbandonedOlmsted, MNSurface · MSHA: Construction Sand and Gravel——00—
Argo2103719 · Abandoned6/8 quarters reportedSt Louis, MNSurface · MSHA: Construction Sand and Gravel06001.0
Barron County Saffer Pit4702770 · AbandonedBarron, WISurface · MSHA: Construction Sand and Gravel——00—
Biesanz Sand And Gravel Pit2100468 · AbandonedWinona, MNSurface · MSHA: Construction Sand and Gravel——00—
CEDAR RAPIDS I4702650 · AbandonedJuneau, WISurface · MSHA: Construction Sand and Gravel——00—
Fillmore County Quarries2102978 · AbandonedGoodhue, MNSurface · MSHA: Crushed, Broken Limestone NEC——00—
FINLEY SCREEN II4703134 · AbandonedLa Crosse, WISurface · MSHA: Construction Sand and Gravel——00—
Gibbs Sand And Gravel Pit4702577 · AbandonedTrempealeau, WISurface · MSHA: Construction Sand and Gravel——00—
HAMMOND WASH PLANT2100050 · AbandonedWabasha, MNSurface · MSHA: Crushed, Broken Limestone NEC——00—
HEWITT ROBBIN I4703023 · AbandonedLa Crosse, WISurface · MSHA: Construction Sand and Gravel——00—
Houston County Quarries2102820 · AbandonedHouston, MNSurface · MSHA: Crushed, Broken Limestone NEC——00—
Kendhammer Quarry & Mill4701109 · AbandonedLa Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC——00—
Kreidermacher Quarry2102684 · AbandonedWinona, MNSurface · MSHA: Crushed, Broken Limestone NEC——00—
Miller Stripping Operation (Portable)4702945 · AbandonedJuneau, WISurface · MSHA: Crushed, Broken Limestone NEC——00—
Moyer Quarry And Mill2102672 · AbandonedWabasha, MNSurface · MSHA: Crushed, Broken Limestone NEC——00—
Pep Single Vibe I4703043 · AbandonedMonroe, WISurface · MSHA: Construction Sand and Gravel——00—
Pickwick Quarry2102946 · AbandonedWinona, MNSurface · MSHA: Crushed, Broken Limestone NEC——00—
Plant #154703403 · AbandonedLa Crosse, WISurface · MSHA: Construction Sand and Gravel——00—
Plant #194703407 · AbandonedEau Claire, WISurface · MSHA: Construction Sand and Gravel——00—
PLANT #214701100 · AbandonedJuneau, WISurface · MSHA: Crushed, Broken Limestone NEC——00—
Plant 224703781 · Temporarily Idled2/8 quarters reportedClark, WISurface · MSHA: Crushed, Broken Limestone NEC0200—
PLANT #234700983 · AbandonedAdams, WISurface · MSHA: Construction Sand and Gravel——00—
PLANT #254701102 · AbandonedLa Crosse, WISurface · MSHA: Construction Sand and Gravel——00—
Plant #274702651 · AbandonedLa Crosse, WISurface · MSHA: Construction Sand and Gravel——00—
PLANT #314702649 · AbandonedJuneau, WISurface · MSHA: Construction Sand and Gravel——00—
PLANT #414703125 · AbandonedMonroe, WISurface · MSHA: Crushed, Broken Limestone NEC——00—
Plant #424703041 · AbandonedDubuque, IASurface · MSHA: Construction Sand and Gravel——00—

LOCATION

Portfolio map

77 of 120 mines with usable MSHA coordinates. Select a marker to open a mine.

Mine coordinates

2025-01-01 – 2026-10-18Applies to production, safety and portfolio metrics. Silica samples have separate filters.

Violations

62

5 significant & substantial (S&S)

  1. 2025 Q17
  2. 2025 Q211
  3. 2025 Q316
  4. 2025 Q45
  5. 2026 Q12
  6. 2026 Q28
  7. 2026 Q313
  8. 2026 Q4 *0

Accident records

21

0 records classified as fatality

  1. 2025 Q11
  2. 2025 Q24
  3. 2025 Q33
  4. 2025 Q45
  5. 2026 Q10
  6. 2026 Q27
  7. 2026 Q31
  8. 2026 Q4 *0

Proposed penalties · USD

11,154.00

62 of 62 violations with amounts

  1. 2025 Q11,057
  2. 2025 Q22,152
  3. 2025 Q32,907
  4. 2025 Q4769
  5. 2026 Q1302
  6. 2026 Q21,208
  7. 2026 Q32,759
  8. 2026 Q4 *—

On-site inspection hours

875.50

207 inspections · 207 with hours

  1. 2025 Q1140.25
  2. 2025 Q270.50
  3. 2025 Q3159.50
  4. 2025 Q4120.75
  5. 2026 Q1102.50
  6. 2026 Q2108.75
  7. 2026 Q3173.25
  8. 2026 Q4 *0.00
Quarterly safety data
QuarterViolationsS&SProposed USDAccident recordsFatality recordsInspectionsOn-site hours
2025-Q1701,057.001023140.3
2025-Q21112,152.00401870.5
2025-Q31612,907.003055159.5
2025-Q451769.005029120.8
2026-Q120302.000022102.5
2026-Q2801,208.007018108.8
2026-Q31322,759.001039173.3
2026-Q4 *00—0030.0

Most cited CFR sections

All violations issued in the selected period. Counts combine subsections.

Safety activity

  1. inspectionF034A64
    Plant #35 · 2103087

    Regular Safety and Health Inspection · 5.8 on-site hours

  2. inspectionF034A65
    Plant #32 · 4702405

    Regular Safety and Health Inspection · 10.3 on-site hours

  3. accident220253290022
    Plant #38 · 2100777

    HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY

    Accident narrative

    While lowering a light on a electrical box, the light came down and hit their jaw, fracturing a molar tooth.

  4. inspectionF034A63
    Plant #55 · 4703194

    Regular Safety and Health Inspection · 3.0 on-site hours

  5. inspectionF034A61
    Plant #34 · 4702646

    Regular Safety and Health Inspection · 5.5 on-site hours

  6. inspectionF034A62
    PLANT 83 · 4703640

    Regular Safety and Health Inspection · 4.0 on-site hours

  7. inspectionF011CA9
    Plant #64 · 2103264

    Regular Safety and Health Inspection · 2.0 on-site hours

  8. inspectionF011CA8
    Plant #24 · 4703039

    Regular Safety and Health Inspection · 3.0 on-site hours

  9. inspectionF011CA7
    Plant #43 · 4700091

    Regular Safety and Health Inspection · 5.5 on-site hours

  10. inspectionF011CA6
    Plant #42 · 4701724

    Regular Safety and Health Inspection · 7.0 on-site hours

  11. accident220253170592
    Plant #73 · 4703466

    HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY

    Accident narrative

    Employee was adding a fellow employee who had fallen to their feet and injured their head/neck and lower back.

  12. inspectionF034A5E
    Plant #29 · 4703059

    Regular Safety and Health Inspection · 8.5 on-site hours

  13. inspectionF011CA3
    Plant #45 · 4702874

    Regular Safety and Health Inspection · 4.8 on-site hours

  14. inspectionF011CA5
    Plant #17 · 4703405

    Regular Safety and Health Inspection · 5.0 on-site hours

  15. inspectionF011CA4
    Plant #85 · 4703786

    Regular Safety and Health Inspection · 6.3 on-site hours

  16. inspectionF034A59
    Wash Plant · 2103460

    Spot Inspection · 1.0 on-site hours

  17. inspectionF011CA2
    Plant #44 · 4701730

    Regular Safety and Health Inspection · 1.5 on-site hours

  18. inspectionF011CA1
    Plant #86 · 4703452

    Regular Safety and Health Inspection · 1.5 on-site hours

  19. inspectionF011C9E
    Plant #39 · 2103088

    Regular Safety and Health Inspection · 2.0 on-site hours

  20. inspectionF011C9F
    Plant #28 · 4703084

    Regular Safety and Health Inspection · 1.8 on-site hours

  21. inspectionF011CA0
    Plant 87 · 4703663

    Regular Safety and Health Inspection · 1.3 on-site hours

  22. accident220253170281
    Plant #45 · 4702874

    HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY

    Accident narrative

    Piece of metal got into employees' eye sometime during shift, unknown how it happened.

  23. inspection6906625
    Plant #50 · 4703042

    Regular Safety and Health Inspection · 1.3 on-site hours

  24. inspection6906624
    Plant #61 · 4703235

    Regular Safety and Health Inspection · 1.5 on-site hours

  25. inspection6906623
    Plant #79 · 4703610

    Regular Safety and Health Inspection · 2.0 on-site hours

Safety sources and definitions

MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-18.

Counts describe published rows, including contractor records; accident records are not distinct incidents or numbers of people injured.

Zero means no matching records in the imported sources, not proof of no events. Historical coverage differs by source; absence before a source begins reporting is not a zero incident rate. Invalid or absent dates and records after the snapshot are excluded.

S&S means SIG_SUB=Y. Fatality records use DEGREE_INJURY_CD=01. Proposed penalties are not final assessed or paid amounts; missing dollar values are omitted.

Inspection hours are SUM_TOTAL_ON_SITE_HOURS attributed to the inspection start date, without supervisor/trainee hours. Missing hours are omitted; a started inspection may still be open.

Portfolio totals use current mine membership, including events before the current owner or operator's tenure.

CFR headings link to the current Title 30 index; they are not historical legal determinations.

SELECTED PORTFOLIO

4 linked operators.

Relationships reflect the selected mine status and current MSHA controller/operator fields.