ALL STATUSES / OPERATOR PORTFOLIO

Mathy Constr. Co. DBA Northland Constrs. of Duluth

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

MSHA OPERATOR IDL16472

MINE PORTFOLIO

98 of 98 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
Wash Plant2103460 · Intermittent6/8 quarters reportedSt Louis, MNSurface · MSHA: Construction Sand and Gravel01,559208.5
Argo2103719 · Abandoned6/8 quarters reportedSt Louis, MNSurface · MSHA: Construction Sand and Gravel06001.0
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—
PLANT #454703109 · AbandonedWinona, MNSurface · MSHA: Construction Sand and Gravel——00—
PLANT #464703152 · AbandonedLa Crosse, WISurface · MSHA: Construction Sand and Gravel——00—
Plant #484703133 · AbandonedLa Crosse, WISurface · MSHA: Construction Sand and Gravel——00—
PLANT #494703149 · AbandonedLa Crosse, WISurface · MSHA: Dimension Limestone——00—
PLANT #524703197 · AbandonedLa Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC——00—
Plant #544703195 · AbandonedGrant, WISurface · MSHA: Crushed, Broken Limestone NEC——00—
PLANT #564703193 · AbandonedLa Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC——00—
Plant #624703232 · AbandonedGrant, WISurface · MSHA: Crushed, Broken Limestone NEC——00—
Plant #632103241 · AbandonedLa Crosse, WISurface · MSHA: Construction Sand and Gravel——00—
Plant #652103290 · AbandonedLa Crosse, WISurface · MSHA: Construction Sand and Gravel——00—
Plant #684703321 · AbandonedOlmsted, MNSurface · MSHA: Crushed, Broken Basalt——00—
Plant #692103334 · AbandonedOlmsted, MNSurface · MSHA: Construction Sand and Gravel——00—
Plant #704703343 · AbandonedPortage, WISurface · MSHA: Construction Sand and Gravel——00—
Plant 754703504 · AbandonedEau Claire, WISurface · MSHA: Construction Sand and Gravel——00—
Plant 852103753 · AbandonedWinona, MNSurface · MSHA: Crushed, Broken Limestone NEC——00—
PLANT 924703681 · Temporarily Idled6/8 quarters reportedJackson, WISurface · MSHA: Sand, Industrial NEC05,469002.8

LOCATION

Portfolio map

74 of 98 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

55

4 significant & substantial (S&S)

  1. 2025 Q17
  2. 2025 Q210
  3. 2025 Q316
  4. 2025 Q41
  5. 2026 Q11
  6. 2026 Q27
  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

10,083.00

55 of 55 violations with amounts

  1. 2025 Q11,057
  2. 2025 Q22,001
  3. 2025 Q32,907
  4. 2025 Q4151
  5. 2026 Q1151
  6. 2026 Q21,057
  7. 2026 Q32,759
  8. 2026 Q4 *—

On-site inspection hours

834.75

201 inspections · 201 with hours

  1. 2025 Q1140.25
  2. 2025 Q265.25
  3. 2025 Q3150.50
  4. 2025 Q4111.75
  5. 2026 Q194.25
  6. 2026 Q299.50
  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-Q21012,001.00401765.3
2025-Q31612,907.003053150.5
2025-Q410151.005028111.8
2026-Q110151.00002194.3
2026-Q2701,057.00701799.5
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. inspectionF00A464
    K400 · 2104045

    Regular Safety and Health Inspection · 1.8 on-site hours

  2. inspectionF03C851
    Plant #74 · 4703465

    Regular Safety and Health Inspection · 3.3 on-site hours

  3. inspectionF016F80
    Plant #18 · 4703406

    Regular Safety and Health Inspection · 1.8 on-site hours

  4. inspectionF016F7E
    Plant #26 · 4702928

    Regular Safety and Health Inspection · 19.0 on-site hours

  5. inspectionF02FF3E
    Plant #59 · 4703215

    103 (g) Written Notification Hazard Complaint Inspectio · 5.8 on-site hours

  6. inspectionF0471D6
    Plant 76 · 4703505

    Regular Safety and Health Inspection · 2.5 on-site hours

  7. inspectionF0471D5
    Plant #36 · 2103143

    Regular Safety and Health Inspection · 4.3 on-site hours

  8. violation5111800
    Plant 78 · 4703595

    56.20003(a) · $151.00 proposed

  9. accident220261890005
    Plant #26 · 4702928

    HANDLING OF MATERIALS · DAYS RESTRICTED ACTIVITY ONLY

    Accident narrative

    While changing a roller frame on screen, employee was leaning over frame to lift roller, straining shoulder

  10. inspectionF03C84B
    Plant 78 · 4703595

    Regular Safety and Health Inspection · 11.8 on-site hours

  11. inspectionF0471C7
    Plant 82 · 4703639

    Regular Safety and Health Inspection · 2.8 on-site hours

  12. violation5114169
    Plant #66 · 4703274

    56.14116(a) · $151.00 proposed

  13. inspectionF00A45E
    Wash Plant · 2103460

    Regular Safety and Health Inspection · 6.3 on-site hours

  14. inspectionF02FF30
    Plant #66 · 4703274

    Regular Safety and Health Inspection · 12.8 on-site hours

  15. violation6490662
    Wash Plant · 2103460

    46.9(a) · $151.00 proposed

  16. violation6490661
    Wash Plant · 2103460

    46.3(b)(4) · $151.00 proposed

  17. accident220261520004
    PLANT #31 · 4703213

    HANDTOOLS (NONPOWERED) · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    While performing maintenance a wrench slipped, hitting employee in face/tooth.

  18. accident220261520001
    Plant #70 · 4703308

    HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    Foreign Body in left eye while working under feeder

  19. inspectionF03C412
    Plant #61 · 4703235

    Regular Safety and Health Inspection · 5.3 on-site hours

  20. violation5111830
    Plant #61 · 4703235

    56.12004 · $151.00 proposed

  21. inspectionF03C411
    Plant #28 · 4703084

    Regular Safety and Health Inspection · 6.0 on-site hours

  22. inspectionF03C40F
    Plant #59 · 4703215

    Regular Safety and Health Inspection · 6.3 on-site hours

  23. accident220261340024
    Plant #90 · 4703040

    HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY

    Accident narrative

    While walking towards the jaw feeder, the employee grabbed the frame to brace self and cut EE's finger on a sharp edge

  24. inspectionF03C40E
    Plant #40 · 4703038

    Regular Safety and Health Inspection · 3.5 on-site hours

  25. inspectionF029D4C
    Plant #44 · 4701730

    Regular Safety and Health Inspection · 8.5 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

1 linked controller.

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