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U.S. MINING ENTITIES / OPERATOR / L00140

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Schildberg Construction Company Inc

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

MSHA OPERATOR IDL00140

MINE PORTFOLIO

39 of 39 mines and facilities

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

Material, method and type filters apply to this table. The portfolio’s status applies to the entire page. GEM fields describe their own release, not the selected MSHA year.

MineLocation / typeCoal · short tonsHours workedViolationsAccident recordsOn-site inspection hours
PLANT #11302090 · Active6/8 quarters reportedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC048,3593033.0
PLANT #21302091 · Active6/8 quarters reportedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC053,7582028.0
PLANT #31302092 · Active6/8 quarters reportedPottawattamie, IASurface · MSHA: Crushed, Broken Limestone NEC070,47410154.8
Plant #81302178 · Active6/8 quarters reportedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC038,4163045.8
Plant #91302216 · Active6/8 quarters reportedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC055,2809050.0
Stripping #11302411 · Intermittent4/8 quarters reportedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC016,121008.0
Stripping #31302196 · Active6/8 quarters reportedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC022,0915133.5
Stripping #41302244 · Active6/8 quarters reportedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC075,3622126.5
Stripping #51302245 · Active6/8 quarters reportedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC056,2100137.3
Stripping #81302487 · Active5/8 quarters reportedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC031,0242035.5
92 Quarry1300211 · AbandonedMadison, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
ATLANTIC MINE OF ATLANTIC, IA1302228 · AbandonedAdair, IAUnderground · MSHA: Crushed, Broken Limestone NEC——00—
Atlantic Quarry And Mill1300209 · AbandonedCass, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Atlantic Shop1302438 · AbandonedCass, IAFacility · MSHA: Crushed, Broken Limestone NEC——00—
Corning Quarry1300208 · AbandonedAdams, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Crescent Quarry1300212 · AbandonedPottawattamie, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Crisler Quarry1300860 · AbandonedPottawattamie, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Crusher #71302256 · AbandonedPottawattamie, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Howe Quarry1300204 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Jefferson Quarry And Mill1300205 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
K And S Quarry1300213 · AbandonedPottawattamie, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Lewis Quarry & Mill1301693 · AbandonedCass, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
LOGAN QUARRY1302195 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Menlo Quarry1300206 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Mt Etna Qy1300207 · AbandonedAdams, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
PLANT #41302093 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
PLANT #51302087 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
PLANT #61302088 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
PLANT #71302086 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Rip Rap #11302379 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Rip Rap #21302380 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Rip Rap #31302410 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Schildberg Shops1302206 · AbandonedAdair, IAFacility · MSHA: Crushed, Broken Limestone NEC——00—
Silver City Quarry1300214 · AbandonedPottawattamie, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Stripping1302094 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
STRIPPING #21302089 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Stripping #71302364 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Thayer Quarry1300215 · AbandonedUnion, IASurface · MSHA: Crushed, Broken Limestone NEC——00—
Wash Plant #11302416 · AbandonedAdair, IASurface · MSHA: Crushed, Broken Limestone NEC——00—

Production and hours sum available quarterly reports. — means unavailable; zero safety records means none in the selected imported period. Ownership reflects the current MSHA record.

LOCATION

Portfolio map

20 of 39 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.

2025 Q1 – 2026 Q4

JSONCSV

Database snapshot · 2026-10-18. All 39 mines listed under this operator were checked; 10 have reports in the available quarters. Totals use current ownership.

Coal production

0

reported short tons

  1. 2025 Q1 *0
  2. 2025 Q20
  3. 2025 Q30
  4. 2025 Q40
  5. 2026 Q1 *0
  6. 2026 Q20
  7. 2026 Q3—No usable value reported
  8. 2026 Q4 *—No usable value reported

Hours worked

467,095

reported employee hours

  1. 2025 Q1 *67,994
  2. 2025 Q290,290
  3. 2025 Q389,360
  4. 2025 Q469,470
  5. 2026 Q1 *68,995
  6. 2026 Q280,986
  7. 2026 Q3—No usable value reported
  8. 2026 Q4 *—No usable value reported

Tons per hour

0.00

production ÷ hours worked

  1. 2025 Q1 *0.00
  2. 2025 Q20.00
  3. 2025 Q30.00
  4. 2025 Q40.00
  5. 2026 Q1 *0.00
  6. 2026 Q20.00
  7. 2026 Q3—No usable value reported
  8. 2026 Q4 *—No usable value reported

Missing values appear as —. Totals use available reports. Tons per hour requires production and hours for the same quarters and a nonzero hours total. * Striped bars mark partial mine coverage or an incomplete quarter. See the table for coverage.

Quarterly data and reporting coverage
Quarterly production, employment and reporting coverage for Schildberg Construction Company Inc
QuarterCoal (short tons)Hours workedTons / hourAvg. employeesCoverage
2025 Q1067,9940.001349/10 mines reporting
2025 Q2090,2900.0014010/10 mines reporting
2025 Q3089,3600.0013610/10 mines reporting
2025 Q4069,4700.0013010/10 mines reporting
2026 Q1068,9950.001268/10 mines reporting
2026 Q2080,9860.0013910/10 mines reporting
2026 Q3————No report
2026 Q4————No report

Safety and enforcement

2025-01-01 – 2026-10-18

Violations

36

6 significant & substantial (S&S)

  1. 2025 Q12
  2. 2025 Q210
  3. 2025 Q31
  4. 2025 Q41
  5. 2026 Q18
  6. 2026 Q210
  7. 2026 Q34
  8. 2026 Q4 *0

Accident records

4

0 records classified as fatality

  1. 2025 Q10
  2. 2025 Q20
  3. 2025 Q33
  4. 2025 Q40
  5. 2026 Q11
  6. 2026 Q20
  7. 2026 Q30
  8. 2026 Q4 *0

Proposed penalties · USD

9,740.00

36 of 36 violations with amounts

  1. 2025 Q1302
  2. 2025 Q21,510
  3. 2025 Q3151
  4. 2025 Q4209
  5. 2026 Q11,675
  6. 2026 Q25,289
  7. 2026 Q3604
  8. 2026 Q4 *—

On-site inspection hours

352.25

41 inspections · 41 with hours

  1. 2025 Q178.75
  2. 2025 Q268.25
  3. 2025 Q328.25
  4. 2025 Q461.75
  5. 2026 Q139.25
  6. 2026 Q259.50
  7. 2026 Q316.50
  8. 2026 Q4 *—

Counts are published records, including contractor records. * The quarter was incomplete at the snapshot date; recent counts may rise as reports arrive. — means no reported amount or hours. Portfolio totals use current membership.

Quarterly safety data
QuarterViolationsS&SProposed USDAccident recordsFatality recordsInspectionsOn-site hours
2025-Q120302.0000778.8
2025-Q21001,510.00001068.3
2025-Q310151.0030328.3
2025-Q411209.0000761.8
2026-Q1821,675.0010439.3
2026-Q21035,289.0000859.5
2026-Q340604.0000216.5
2026-Q4 *00—000—

Most cited CFR sections

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

SectionViolationsS&S
30 CFR 56.14100Safety defects; examination, correction and records.60
30 CFR 56.12004Electrical conductors.41
30 CFR 56.14132Horns and backup alarms.30
30 CFR 47.44Temporary, portable containers.20
30 CFR 56.12032Inspection and cover plates.20
30 CFR 56.14101Brakes.20
30 CFR 56.14130Roll-over protective structures (ROPS) and seat belts.21
30 CFR 56.14131Seat belts for haulage trucks.20
30 CFR 56.4130Electric substations and liquid storage facilities.20
30 CFR 56.11002Handrails and toeboards.10

Safety activity

  1. accident220252130025
    Stripping #4 · 1302244

    POWERED HAULAGE · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    Dumping the truck when the load shifted to the back causing truck to roll over.

  2. inspectionF028E96
    Stripping #4 · 1302244

    Regular Safety and Health Inspection · 6.5 on-site hours

  3. inspectionF016E3B
    Stripping #1 · 1302411

    Regular Safety and Health Inspection · 3.0 on-site hours

  4. inspectionF016E3A
    PLANT #3 · 1302092

    Regular Safety and Health Inspection · 10.3 on-site hours

  5. violation9699939
    PLANT #3 · 1302092

    56.14132(a) · $151.00 proposed

  6. violation9699938
    PLANT #3 · 1302092

    56.14100(c) · $151.00 proposed

  7. violation9699937
    PLANT #3 · 1302092

    56.14100(c) · $151.00 proposed

  8. inspectionF02FADA
    Plant #8 · 1302178

    Regular Safety and Health Inspection · 10.5 on-site hours

  9. violation5114010
    Plant #8 · 1302178

    56.14107(a) · $151.00 proposed

  10. violation5114009
    Plant #8 · 1302178

    47.44(b) · $151.00 proposed

  11. violation5114008
    Plant #8 · 1302178

    56.14116(a) · $151.00 proposed

  12. inspectionF02FAD8
    Stripping #3 · 1302196

    Compliance Follow-up Inspection · 1.0 on-site hours

  13. inspectionF02FAD9
    Stripping #5 · 1302245

    Regular Safety and Health Inspection · 8.0 on-site hours

  14. inspectionF02FAD7
    Stripping #3 · 1302196

    Regular Safety and Health Inspection · 10.3 on-site hours

  15. violation5114007
    Stripping #3 · 1302196

    56.12008 · $151.00 proposed

  16. violation5114006
    Plant #9 · 1302216

    56.14101(a)(2) · $151.00 proposed

  17. violation5114005
    Plant #9 · 1302216

    56.14100(c) · $151.00 proposed

  18. inspectionF02FAD6
    Plant #9 · 1302216

    Regular Safety and Health Inspection · 12.8 on-site hours

  19. inspectionF016E29
    Stripping #8 · 1302487

    Regular Safety and Health Inspection · 4.5 on-site hours

  20. violation9699887
    PLANT #2 · 1302091

    56.14205 · $151.00 proposed

  21. inspectionF016E28
    PLANT #1 · 1302090

    Mine Idle Activity · 0.8 on-site hours

  22. inspectionF016E27
    PLANT #2 · 1302091

    Regular Safety and Health Inspection · 7.3 on-site hours

  23. inspectionF0116B4
    Stripping #4 · 1302244

    Regular Safety and Health Inspection · 3.5 on-site hours

  24. inspectionF0116B3
    Plant #8 · 1302178

    Regular Safety and Health Inspection · 14.3 on-site hours

  25. inspectionF0116B2
    Plant #9 · 1302216

    Regular Safety and Health Inspection · 11.0 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.

CONTROLLER / M00097Mark Schildberg39 selected mines →