MINE DETAILS
Discovery Day Mine
MSHA MINE ID0405222
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Discovery Day Mine41.20500, -123.31194Open 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.
—
Trinity Alps Resources Inc.controlsGold Run Enterprises LLCoperatesDiscovery Day Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0405222—
Merendon Mining (Nevada) InccontrolsMerendon Mining (California) IncoperatesDiscovery Day Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0405222—
Patrick A Fagen et alcontrolsDiscovery Day LLCoperatesDiscovery Day Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0405222—
Mark E Gavard et alcontrolsG W Z Management Company IncoperatesDiscovery Day Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0405222—
Thomas Nicholas et alcontrolsG W Z Management Company IncoperatesDiscovery Day Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0405222—
Dorow ArtcontrolsSky Scientific Mining & Processing IncoperatesDiscovery Day Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0405222—
Mark E Gavard et alcontrolsG W Z Management Company IncoperatesDiscovery Day Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0405222—
Thomas Nicholas et alcontrolsG W Z Management Company IncoperatesDiscovery Day Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0405222Other 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
5 historical accident/injury rows; 1 coded fatalities and 273 lost days across the published record.
ACCIDENT + INJURY RECORD0 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEneutral
Violations and penalties
319 violation rows across the full record; 115 carry an S&S flag and $114,527 appears in current assessed amounts.
ENFORCEMENT ACTIVITY0 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHcontext
Occupational health samples
13 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 EXPOSURE13 samples
personal-health-samples04 / PRODUCTIONcontext
Quarterly production and employment
120 employee hours and 1 summed average employees across reported subunits in the latest published quarter.
2013-Q40 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
254 contested-violation rows, 254 civil-penalty docket/decision rows, and 40 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE548 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
36 inspection events and 2K 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. 8 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 57.12028Testing grounding systems.1 recent row ↗30 CFR 57.4201Inspection.2 recent rows ↗30 CFR 57.12006Distribution boxes.1 recent row ↗30 CFR 57.20003Housekeeping.2 recent rows ↗30 CFR 57.11002Handrails and toeboards.1 recent row ↗30 CFR 57.11001Safe access.2 recent rows ↗30 CFR 57.18002Examination of working places.2 recent rows ↗30 CFR 57.14100Safety defects; examination, correction and records.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
860425157.12028Citation
860425057.4201(a)(2)Citation
860424957.4201(a)(2)Citation
860424857.12006Citation
860442957.20003(a)Citation
860442857.11002Citation
859952257.11001Order
859950457.18002(b)Citation
Coal dust, noise and other contaminants. Silica records above ↑
Respirable dust, <.1mgCleanup Man
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgMucking Mach. Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgMechanic
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgDrill Oper., Jackleg/Stoper
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
SOURCE COVERAGE
Reporting dates and coverage
13 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors5Mar 4, 2005—May 28, 2010mine-keyed
Addresses of Recordidentity · logistics1Jan 1, 2014—Jan 1, 2014mine-keyed
Assessed Violationscompliance · legal277Jul 27, 2004—May 22, 2012mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal254Dec 5, 2005—Sep 30, 2013mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal40Mar 24, 2010—Sep 28, 2010mine-keyed
Contested Violationscompliance · legal254Jul 27, 2004—Nov 30, 2011mine-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 · compliance8Sep 1, 1993—Dec 8, 2009mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance116Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance23Not published—Not publishedmine-keyed
Inspectionssafety · compliance36Jul 27, 2004—Oct 15, 2012mine-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 · safety13Sep 22, 2004—Jul 18, 2007mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal319Jul 27, 2004—May 22, 2012mine-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.