MINE DETAILS
Three Forks Mill
MSHA MINE ID2400162
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Three Forks Mill45.87889, -111.55528Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-13. MSHA quarterly production and employment reports.
Coal production
0reported short tons
Hours worked
238,871reported employee hours
Tons per hour
0.00production ÷ hours worked
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
| Quarter | Coal (short tons) | Hours worked | Tons / hour | Avg. employees | Coverage |
|---|---|---|---|---|---|
| 2025 Q1 | 0 | 41,251 | 0.00 | 81 | 1/1 mines reporting |
| 2025 Q2 | 0 | 39,244 | 0.00 | 78 | 1/1 mines reporting |
| 2025 Q3 | 0 | 39,542 | 0.00 | 78 | 1/1 mines reporting |
| 2025 Q4 | 0 | 38,179 | 0.00 | 78 | 1/1 mines reporting |
| 2026 Q1 | 0 | 40,434 | 0.00 | 76 | 1/1 mines reporting |
| 2026 Q2 | 0 | 40,221 | 0.00 | 76 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
143 significant & substantial (S&S)
Accident records
60 records classified as fatality
Proposed penalties · USD
2,927.0014 of 14 violations with amounts
On-site inspection hours
67.507 inspections · 7 with hours
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
| Quarter | Violations | S&S | Proposed USD | Accident records | Fatality records | Inspections | On-site hours |
|---|---|---|---|---|---|---|---|
| 2025-Q1 | 3 | 1 | 511.00 | 1 | 0 | 1 | 12.3 |
| 2025-Q2 | 0 | 0 | — | 1 | 0 | 0 | — |
| 2025-Q3 | 4 | 0 | 604.00 | 4 | 0 | 1 | 16.0 |
| 2025-Q4 | 4 | 2 | 1,359.00 | 0 | 0 | 2 | 15.8 |
| 2026-Q1 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q2 | 3 | 0 | 453.00 | 0 | 0 | 2 | 15.8 |
| 2026-Q3 | 0 | 0 | — | 0 | 0 | 1 | 7.8 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
Spot Inspection · 7.8 on-site hours
Spot Inspection · 1.5 on-site hours
56.15001 · $151.00 proposed
56.12035 · $151.00 proposed
56.14201(b) · $151.00 proposed
Regular Safety and Health Inspection · 14.3 on-site hours
Compliance Follow-up Inspection · 1.3 on-site hours
56.20003(a) · S&S · $592.00 proposed
56.17001 · $151.00 proposed
56.11003 · S&S · $465.00 proposed
Regular Safety and Health Inspection · 14.5 on-site hours
56.9315 · $151.00 proposed
OTHER · INJURIES DUE TO NATURAL CAUSES
Accident narrative
Employee suffered a stroke while on shift
STEPPING OR KNEELING ON OBJECT · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
Employee was working in the milling room while concrete wall was being removed. Employee stepped on a wedge and rolled ankle. Employee informed company on 10/1/2025
DISORDERS (REPEATED TRAUMA) · OCCUPATNAL ILLNESS NOT DEG 1-6
Accident narrative
Miner had recorded a Standard Threshold Shift
DISORDERS (REPEATED TRAUMA) · OCCUPATNAL ILLNESS NOT DEG 1-6
Accident narrative
Miner had recorded a Standard Threshold Shift
56.12016 · $151.00 proposed
56.12028 · $151.00 proposed
56.12028 · $151.00 proposed
Regular Safety and Health Inspection · 16.0 on-site hours
56.17001 · $151.00 proposed
MACHINERY · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
A rejected bag hung up at the top of the rejects chute in Robo 2. The operator used a ladder to reach into the reject chute to free the bag but when EE reached for the bag the cutting wheel started. The operators right thumb contacted the cutting wheel resulting in a cut.
SLIP OR FALL OF PERSON · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
While going down the steps in Robo 3 the operator's boot caught the grating causing operator to miss the last 2 steps. Employee fell to the ground and feels pain on both inside and outside of knees. Employee referred to a specialist on 2/17
56.20011 · S&S · $209.00 proposed
56.14115(b) · $151.00 proposed
Safety sources and definitions
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-13.
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.
OWNERSHIP
Operator and controller history
Current ownership comes from MSHA Mines. Historical start and end dates come from MSHA Controller and Operator History.
—
Magris Performance Materials InccontrolsMagris Talc USA Inc.operatesThree Forks Mill
msha-controller-operator-history · controller/operator co-tenure derived on mine 2400162—
Imerys S AcontrolsImerys Talc IncorporatedoperatesThree Forks Mill
msha-controller-operator-history · controller/operator co-tenure derived on mine 2400162—
Rio Tinto GroupcontrolsImerys Talc IncorporatedoperatesThree Forks Mill
msha-controller-operator-history · controller/operator co-tenure derived on mine 2400162—
Cyprus Amax Minerals CompanycontrolsCyprus Industrial Minerals CompanyoperatesThree Forks Mill
msha-controller-operator-history · controller/operator co-tenure derived on mine 2400162—
Cyprus Mines CorpcontrolsCyprus Industrial Minerals CompanyoperatesThree Forks Mill
msha-controller-operator-history · controller/operator co-tenure derived on mine 2400162Other historical summaries · source-specific periods
RECORD SUMMARY
Production, safety and enforcement
These summaries use the periods stated on each card, independently of the reporting period above.
01 / SAFETYwatch
Accidents and injuries
68 historical accident/injury rows; 0 coded fatalities and 1,223 lost days across the published record.
ACCIDENT + INJURY RECORD22 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
301 violation rows across the full record; 28 carry an S&S flag and $63,536 appears in current assessed amounts.
ENFORCEMENT ACTIVITY50 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHcontext
Occupational health samples
53 personal. 0 personal-sample rows have a published C/E ratio above 1; 0 noise rows have an action-level or PEL dose above 100%. These are separate measures, not a silica exceedance count. Silica results and sample status are shown separately.
OCCUPATIONAL EXPOSURE53 samples
personal-health-samples04 / PRODUCTIONcontext
Quarterly production and employment
40K employee hours and 76 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
4 contested-violation rows, 4 civil-penalty docket/decision rows, and 8 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE16 linked rows
conferencescontested-violationscivil-penalty-dockets-decisions06 / CONTRACTORScontext
Contractors
Contractors are linked through this mine’s violation or accident records. Their production and hours cover all their operations, so they are not included in this mine’s totals.
ENTITY-LEVEL CONTEXT9 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
74 inspection events and 2K published inspection hours across the historical record.
OVERSIGHT COVERAGE17 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 1 silica records across the mine’s published history.
Personal silica samples · concentration / limit
Quarterly mean · published C/E ratio
— No eligible measurements. * Quarter in progress. Means describe the available samples, not average exposure across the mine.
Quartz % is the sample’s quartz content; µg/m³ is its reported concentration. Personal C/E is the ratio to the limit published with that sample. Personal and area concentration units and void status are not specified in those source files.
| Date / sample | Dataset / analyte | Occupation / area | Measurement | Sample status | Published action |
|---|---|---|---|---|---|
| 000000202603913500 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Bagging Operator | 0× published limitConcentration: 0000.22 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F031153 |
Sources and interpretation
- Coal means use numeric concentrations from samples marked not voided, excluding control/invalid sample types and dates after the snapshot. Missing values remain null; reported zeroes remain zero.
- Quarterly means describe available samples, not mine-wide or worker-average exposure. Quarters with no eligible measurements remain empty; the current quarter is partial.
- Personal C/E is MSHA's published concentration-to-limit ratio. A value above 1 is not by itself a citation or a determination under the 2024 silica rule. Personal and area files do not publish a void-status field.
- Area records include bulk-dust analyses and are kept separate from personal exposure results. Their concentration units are not specified in the source dictionary.
- Missing samples do not establish safe conditions. Coal quartz percentage and concentration are separate measures. No compliance threshold is inferred for coal samples.
Coal quartz field definitions ↗Metal/nonmetal personal field definitions ↗Metal/nonmetal area field definitions ↗
EIA + TITLE 30
EIA production and cited regulations
EIA annual figures are reported separately from MSHA. Regulation links use the current eCFR snapshot.
Not present in the 2024 EIA coal workbook.
This can mean the operation is non-coal, inactive for the annual period, or outside the EIA-7A reporting population.
30 CFR 56.15001First-aid materials.1 recent row ↗30 CFR 56.12035Weatherproof lamp sockets.1 recent row ↗30 CFR 56.14201Conveyor start-up warnings.1 recent row ↗30 CFR 56.20003Housekeeping.1 recent row ↗30 CFR 56.17001Illumination of surface working areas.2 recent rows ↗30 CFR 56.11003Construction and maintenance of ladders.1 recent row ↗30 CFR 56.9315Dust control.1 recent row ↗30 CFR 56.12016Work on electrically-powered equipment.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
876110156.15001Citation
876110056.12035Citation
876109956.14201(b)Citation
505036456.20003(a)S&S
505036356.17001Citation
505036256.11003S&S
505036156.9315Citation
505032656.12016Citation
Coal dust, noise and other contaminants. Silica records above ↑
Nuisance dust, respirable, <1% QtzBagging Operator
C/E: 00.24Concentration: 0002.41 · limit: 0010.00Source unit unspecified
Nuisance dust, respirable, <1% QtzWarehouse Man
C/E: 00.05Concentration: 0000.50 · limit: 0010.00Source unit unspecified
Respirable dust, <.1mgFront-end Loader Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzMechanic
C/E: 00.00Concentration: 0000.61 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzDump Operator
C/E: 00.00Concentration: 0000.21 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzBagging Operator
C/E: 00.00Concentration: 0001.21 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzBagging Operator
C/E: 00.00Concentration: 0000.95 · limit: 0000.00Source unit unspecified
Fibers, >5umFront-end Loader Operator
C/E: 00.00Concentration: 0000.01 · limit: 0000.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
15 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors68Mar 6, 2000—Sep 29, 2025mine-keyed
Addresses of Recordidentity · logistics1May 15, 1974—May 15, 1974mine-keyed
Assessed Violationscompliance · legal301Jun 21, 2000—May 28, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal4Apr 21, 2010—Apr 4, 2011mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal8Jul 31, 2008—Dec 18, 2024mine-keyed
Contested Violationscompliance · legal4Jan 14, 2009—Jul 16, 2009mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety1,113Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety223Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance5Jan 1, 1950—Feb 17, 2021mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance212Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance54Not published—Not publishedmine-keyed
Inspectionssafety · compliance74Jun 21, 2000—Sep 18, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety—No published rowsabsent / not applicable
Metal and Nonmetal Personal Health Sampleshealth · safety53Jan 23, 2003—Sep 18, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal301Jun 21, 2000—May 28, 2026mine-keyed
107(a) Orders Issuedsafety · compliance—No published rowsabsent / not applicable
NOTES
Limitations
- Contractor production is entity-level and is never represented as mine-attributable.
- Missing rows can mean no event, publication delay, identity mismatch, or inapplicability.