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. inspectionF02BC3A
    Plant 76 · 4703505

    Regular Safety and Health Inspection · 1.0 on-site hours

  2. inspectionF02C854
    Plant #40 · 4703038

    Regular Safety and Health Inspection · 1.0 on-site hours

  3. inspectionF02C856
    Plant #89 · 4703086

    Regular Safety and Health Inspection · 1.0 on-site hours

  4. inspectionF02C853
    Plant #33 · 4703160

    Regular Safety and Health Inspection · 3.0 on-site hours

  5. inspectionF029649
    Plant #55 · 4703194

    Regular Safety and Health Inspection · 4.0 on-site hours

  6. violation9998860
    Plant #38 · 2100777

    56.14100(a) · $151.00 proposed

  7. violation9998859
    Plant #38 · 2100777

    56.14101(a)(3) · $151.00 proposed

  8. violation5113611
    Plant #55 · 4703194

    56.12004 · $151.00 proposed

  9. violation5113610
    Plant #55 · 4703194

    56.9301 · $151.00 proposed

  10. inspectionF02BC32
    Plant #38 · 2100777

    Regular Safety and Health Inspection · 4.8 on-site hours

  11. inspectionF029646
    Plant #36 · 2103143

    Regular Safety and Health Inspection · 2.0 on-site hours

  12. inspectionF02C850
    Plant #30 · 4702873

    Regular Safety and Health Inspection · 4.0 on-site hours

  13. inspectionF029648
    Plant #88 · 4703080

    Regular Safety and Health Inspection · 4.0 on-site hours

  14. inspectionF02BC31
    Plant #53 · 4703196

    Regular Safety and Health Inspection · 5.0 on-site hours

  15. violation5100049
    Plant #30 · 4702873

    56.12004 · S&S · $642.00 proposed

  16. violation5100048
    Plant #30 · 4702873

    56.14107(a) · $151.00 proposed

  17. violation7838391
    Plant #73 · 4703466

    56.20003(a) · $151.00 proposed

  18. inspectionF02BC30
    Plant 87 · 4703663

    Regular Safety and Health Inspection · 1.8 on-site hours

  19. inspectionF01F834
    Plant #70 · 4703308

    Regular Safety and Health Inspection · 2.8 on-site hours

  20. inspectionF01F838
    Plant #73 · 4703466

    Regular Safety and Health Inspection · 5.0 on-site hours

  21. inspectionF01F835
    Plant #81 · 4703467

    Regular Safety and Health Inspection · 2.5 on-site hours

  22. inspectionF02233B
    Plant #20 · 1302134

    Regular Safety and Health Inspection · 3.0 on-site hours

  23. inspectionF00698D
    PLANT 92 · 4703681

    Regular Safety and Health Inspection · 2.8 on-site hours

  24. violation9695969
    Plant #20 · 1302134

    56.12004 · $151.00 proposed

  25. inspectionF01F830
    Argo · 2103719

    Mine Idle Activity · 1.0 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

1 linked controller.

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