ALL STATUSES / OPERATOR PORTFOLIO

Mutual Materials Company

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

MSHA OPERATOR IDL00311

MINE PORTFOLIO

11 of 11 mines and facilities

2025-01-01 – 2026-10-17. All statuses records; production reporting is not required.

MineLocation / typeCoal · short tonsHours workedViolationsAccident recordsOn-site inspection hours
Mica Mine and Plant4500247 · IntermittentSpokane, WASurface · MSHA: Common Clays NEC——2015.3
Clay City Mine4501372 · AbandonedPierce, WASurface · MSHA: Clay, Ceramic, Refractory Mnls.——00—
Elk Pit4500256 · AbandonedKing, WASurface · MSHA: Fire Clay——00—
Gresham Clay Mine3500233 · AbandonedMultnomah, ORSurface · MSHA: Common Clays NEC——00—
Hill Three Clay Mine4501375 · AbandonedPierce, WASurface · MSHA: Common Clays NEC——00—
Kapowsin Clay Mine4501374 · AbandonedPierce, WASurface · MSHA: Common Clays NEC——00—
Newcastle Brick Plant Mill4502191 · AbandonedKing, WAFacility · MSHA: Common Clays NEC——00—
Portable Mine Operation4500919 · AbandonedSpokane, WASurface · MSHA: Common Clays NEC——00—
Section 31 Mine4501052 · AbandonedKing, WASurface · MSHA: Common Clays NEC——00—
Shaw Clay Mine4501373 · AbandonedPierce, WASurface · MSHA: Common Clays NEC——00—
Tensed Mine1000542 · AbandonedBenewah, IDSurface · MSHA: Fire Clay——00—

LOCATION

Portfolio map

6 of 11 mines with usable MSHA coordinates. Select a marker to open a mine.

Mine coordinates

2025-01-01 – 2026-10-17Applies to production, safety and portfolio metrics. Silica samples have separate filters.

Violations

2

0 significant & substantial (S&S)

  1. 2025 Q10
  2. 2025 Q22
  3. 2025 Q30
  4. 2025 Q40
  5. 2026 Q10
  6. 2026 Q20
  7. 2026 Q30
  8. 2026 Q4 *0

Accident records

0

0 records classified as fatality

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

Proposed penalties · USD

302.00

2 of 2 violations with amounts

  1. 2025 Q1—
  2. 2025 Q2302
  3. 2025 Q3—
  4. 2025 Q4—
  5. 2026 Q1—
  6. 2026 Q2—
  7. 2026 Q3—
  8. 2026 Q4 *—

On-site inspection hours

15.25

2 inspections · 2 with hours

  1. 2025 Q1—
  2. 2025 Q29.00
  3. 2025 Q3—
  4. 2025 Q4—
  5. 2026 Q1—
  6. 2026 Q2—
  7. 2026 Q36.25
  8. 2026 Q4 *—
Quarterly safety data
QuarterViolationsS&SProposed USDAccident recordsFatality recordsInspectionsOn-site hours
2025-Q100—000—
2025-Q220302.000019.0
2025-Q300—000—
2025-Q400—000—
2026-Q100—000—
2026-Q200—000—
2026-Q300—0016.3
2026-Q4 *00—000—

Most cited CFR sections

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

Safety activity

  1. inspectionF045069
    Mica Mine and Plant · 4500247

    Regular Safety and Health Inspection · 6.3 on-site hours

  2. violation5101005
    Mica Mine and Plant · 4500247

    46.7 · $151.00 proposed

  3. violation5101004
    Mica Mine and Plant · 4500247

    50.30(a) · $151.00 proposed

  4. inspectionF021EEC
    Mica Mine and Plant · 4500247

    Regular Safety and Health Inspection · 9.0 on-site hours

Safety sources and definitions

MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-17.

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.