MINE DETAILS
Ruby Mine Trust
MSHA MINE ID0503208
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Ruby Mine Trust38.02278, -107.67139Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-13. MSHA quarterly production and employment reports.
Coal production
—reported short tons
Hours worked
—reported employee hours
Tons per hour
—production ÷ 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 | — | — | — | — | No report |
| 2025 Q2 | — | — | — | — | No report |
| 2025 Q3 | — | — | — | — | No report |
| 2025 Q4 | — | — | — | — | No report |
| 2026 Q1 | — | — | — | — | No report |
| 2026 Q2 | — | — | — | — | No report |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
00 significant & substantial (S&S)
Accident records
00 records classified as fatality
Proposed penalties · USD
—0 of 0 violations with amounts
On-site inspection hours
—0 inspections · 0 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 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2025-Q2 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2025-Q3 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2025-Q4 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q1 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q2 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q3 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
| Section | Violations | S&S |
|---|
No violation records in this period.
Safety activity
No matching records in this period.
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.
—
Mickey W Tinercontrols42 MWT Mining Company LLCoperatesRuby Mine Trust
msha-controller-operator-history · controller/operator co-tenure derived on mine 0503208—
Barbara Clark et alcontrolsUnderground Specialty Company LLCoperatesRuby Mine Trust
msha-controller-operator-history · controller/operator co-tenure derived on mine 0503208—
Jack Clark et alcontrolsUnderground Specialty Company LLCoperatesRuby Mine Trust
msha-controller-operator-history · controller/operator co-tenure derived on mine 0503208—
David L WalkercontrolsWalker Ruby Mining Company, Inc.operatesRuby Mine Trust
msha-controller-operator-history · controller/operator co-tenure derived on mine 0503208—
Keith Emmett et alcontrolsMount Sneffels Mining Company LLCoperatesRuby Mine Trust
msha-controller-operator-history · controller/operator co-tenure derived on mine 0503208—
Wiley McCall et alcontrolsMount Sneffels Mining Company LLCoperatesRuby Mine Trust
msha-controller-operator-history · controller/operator co-tenure derived on mine 0503208—
David L WalkercontrolsWalker Mining & Milling IncoperatesRuby Mine Trust
msha-controller-operator-history · controller/operator co-tenure derived on mine 0503208—
Talbot Edward FcontrolsWalker Mining & Milling IncoperatesRuby Mine Trust
msha-controller-operator-history · controller/operator co-tenure derived on mine 0503208—
David L WalkercontrolsWalker Mining & Milling IncoperatesRuby Mine Trust
msha-controller-operator-history · controller/operator co-tenure derived on mine 0503208Other 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 / SAFETYneutral
Accidents and injuries
0 historical accident/injury rows; 0 coded fatalities and 0 lost days across the published record.
ACCIDENT + INJURY RECORD0 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEneutral
Violations and penalties
50 violation rows across the full record; 15 carry an S&S flag and $11,221 appears in current assessed amounts.
ENFORCEMENT ACTIVITY0 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHcontext
Occupational health samples
7 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 EXPOSURE7 samples
personal-health-samples04 / PRODUCTIONcontext
Quarterly production and employment
2K employee hours and 7 summed average employees across reported subunits in the latest published quarter.
2015-Q40 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
26 contested-violation rows, 23 civil-penalty docket/decision rows, and 0 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE49 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 CONTEXT0 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
23 inspection events and 390 published inspection hours across the historical record.
OVERSIGHT COVERAGE0 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 |
|---|---|---|---|---|---|
| No silica records match these filters. Missing samples do not establish safe conditions. | |||||
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 50.30Preparation and submission of MSHA Form 7000-2—Quarterly Employment and Coal Production Report.3 recent rows ↗30 CFR 57.18002Examination of working places.1 recent row ↗30 CFR 57.12020Protection of persons at switchgear.1 recent row ↗30 CFR 57.11058Check-in, check-out system.2 recent rows ↗30 CFR 41.11Notification by operator.1 recent row ↗30 CFR 49.2Availability of mine rescue teams.1 recent row ↗30 CFR 57.20020Unattended mine openings.1 recent row ↗30 CFR 57.14207Parking procedures for unattended equipment.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
883795850.30(a)Order
883793650.30(a)Citation
893236650.30(a)Citation
893232657.18002(a)Citation
876356057.12020Citation
876355957.11058Citation
893219141.11(a)Citation
893219049.2(h)Citation
Coal dust, noise and other contaminants. Silica records above ↑
Respirable dust, <.1mgLaborer, Bullgang
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgLaborer, Bullgang
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Unlisted Particulate, respirable, <1% QtzMiner, Drift
C/E: 00.00Concentration: 0000.15 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgSupervisor, Co. Official
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgHammer Mill Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgHammer Mill Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
11 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors—No published rowsabsent / not applicable
Addresses of Recordidentity · logistics1Sep 10, 2019—Sep 10, 2019mine-keyed
Assessed Violationscompliance · legal47Aug 11, 2009—Mar 7, 2017mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal23Mar 14, 2018—Mar 14, 2018mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal—No published rowsabsent / not applicable
Contested Violationscompliance · legal26Dec 7, 2015—May 11, 2017mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety—No published rowsabsent / not applicable
Contractor Employment and Production — Yearlycontractors · production · safety—No published rowsabsent / not applicable
Controller and Operator Historyidentity · compliance9Mar 9, 1978—Mar 2, 2016mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance26Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance8Not published—Not publishedmine-keyed
Inspectionssafety · compliance23Aug 10, 2009—Aug 14, 2019mine-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 · safety7Sep 2, 2009—Jul 27, 2016mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal50Aug 11, 2009—Mar 21, 2017mine-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.