MINE DETAILS
Soledad Mountain Project
MSHA MINE ID0405319
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Soledad Mountain Project35.00889, -118.18083Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-18. MSHA quarterly production and employment reports.
Coal production
0reported short tons
Hours worked
903,512reported 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 | 158,233 | 0.00 | 305 | 1/1 mines reporting |
| 2025 Q2 | 0 | 137,044 | 0.00 | 294 | 1/1 mines reporting |
| 2025 Q3 | 0 | 158,031 | 0.00 | 283 | 1/1 mines reporting |
| 2025 Q4 | 0 | 153,940 | 0.00 | 290 | 1/1 mines reporting |
| 2026 Q1 | 0 | 153,888 | 0.00 | 295 | 1/1 mines reporting |
| 2026 Q2 | 0 | 142,376 | 0.00 | 317 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-18
Violations
288 significant & substantial (S&S)
Accident records
110 records classified as fatality
Proposed penalties · USD
16,688.0027 of 28 violations with amounts
On-site inspection hours
199.0013 inspections · 13 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 | — | 2 | 0 | 0 | — |
| 2025-Q2 | 8 | 1 | 2,288.00 | 2 | 0 | 3 | 63.5 |
| 2025-Q3 | 0 | 0 | — | 2 | 0 | 0 | — |
| 2025-Q4 | 0 | 0 | — | 1 | 0 | 0 | — |
| 2026-Q1 | 7 | 2 | 4,633.00 | 0 | 0 | 1 | 47.0 |
| 2026-Q2 | 1 | 0 | 151.00 | 3 | 0 | 3 | 17.0 |
| 2026-Q3 | 11 | 4 | 9,616.00 | 1 | 0 | 5 | 71.5 |
| 2026-Q4 * | 1 | 1 | — | 0 | 0 | 1 | 0.0 |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
OTHER · INJURIES DUE TO NATURAL CAUSES
Accident narrative
Employee experienced a seizure while making observations on the computer in the AA Lab room of the Merrill Crowe Facility. Another employee accompanying them noticed immediately and caught them bringing them safely to the floor where they laid EE on their side. EE just returned to work from medical leave from the same condition in November of 2025.
56.18002(b) · $151.00 proposed
56.14100(b) · $245.00 proposed
56.14100(b) · $245.00 proposed
56.9300(b) · S&S · $2,312.00 proposed
56.4603(a) · $209.00 proposed
56.14101(a)(2) · $151.00 proposed
56.14107(a) · S&S · $1,320.00 proposed
Regular Safety and Health Inspection · 47.0 on-site hours
OTHER · INJURIES DUE TO NATURAL CAUSES
Accident narrative
Employee accompanied another employee and a lead employee to go over some program reset training on the refinery retort. While programing the retort with the lead and other employee observing, EE paused, looked straight in the air, began whispering something, slowly stepped in circular motion and fell face forward going into a seizure.
OTHER · INJURIES DUE TO NATURAL CAUSES
Accident narrative
Employee had just finished lunch and begun EE's normal job duties. While working from EE's desk EE experienced severe lower abdominal pain. EE notified EE's supervisor who then notified the General Manager. The General Manager placed a call to request an ambulance. EE was then transported to the ER.
POWERED HAULAGE · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
While operating a loader, the operators bucket got hung up on a buried rock in the muck face. When the rock gave way, the loader jarred the operator causing a neck strain/sprain.
103 (g) Written Notification Hazard Complaint Inspectio · 12.3 on-site hours
SLIP OR FALL OF PERSON · DAYS AWAY FROM WORK ONLY
Accident narrative
While collecting process solution samples from the leach pad an employee was descending down the ditch where samples are taken. While walking down the ladder used to travel up/down the ditch a step broke allowing the employee to fall backwards on the side. On 6-4-2025 it was determined they suffered a fractured L1 vertebra. The employee's first day missed from work was 6-6-2025.
Verbal Hazard Complaint Inspections · 5.0 on-site hours
56.20003(a) · $151.00 proposed
47.41(a) · $151.00 proposed
56.11001 · S&S · $465.00 proposed
56.14132(a) · $697.00 proposed
56.4201(a)(1) · $151.00 proposed
56.16001 · $209.00 proposed
56.12008 · $151.00 proposed
56.14100(a) · $313.00 proposed
Regular Safety and Health Inspection · 46.3 on-site hours
HANDTOOLS (NONPOWERED) · DAYS AWAY FROM WORK ONLY
Accident narrative
Employee was un-coupling a trailer mounted pressure washer from a pick-up truck hitch. The trailer tongue jack failed resulting in the tongue falling to the ground and striking the employee in the dorsal region of the right foot. This resulted in fracture to the right foot.
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.
OWNERSHIP
Operator and controller history
Current ownership comes from MSHA Mines. Historical start and end dates come from MSHA Controller and Operator History.
—
Soledad Holdings InccontrolsGolden Queen Mining CompanyoperatesSoledad Mountain Project
msha-controller-operator-history · controller/operator co-tenure derived on mine 0405319—
Gauss LLC et alcontrolsGolden Queen Mining CompanyoperatesSoledad Mountain Project
msha-controller-operator-history · controller/operator co-tenure derived on mine 0405319—
Golden Queen Mining Company Ltd et alcontrolsGolden Queen Mining CompanyoperatesSoledad Mountain Project
msha-controller-operator-history · controller/operator co-tenure derived on mine 0405319—
Golden Queen Mining Company LtdcontrolsGolden Queen Mining Company IncoperatesSoledad Mountain Project
msha-controller-operator-history · controller/operator co-tenure derived on mine 0405319Other 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
60 historical accident/injury rows; 0 coded fatalities and 3,550 lost days across the published record.
ACCIDENT + INJURY RECORD29 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
294 violation rows across the full record; 113 carry an S&S flag and $254,642 appears in current assessed amounts.
ENFORCEMENT ACTIVITY154 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
116 personal. 4 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 EXPOSURE116 samples
personal-health-samples04 / PRODUCTIONcontext
Quarterly production and employment
142K employee hours and 317 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
1 contested-violation rows, 2 civil-penalty docket/decision rows, and 21 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE24 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 CONTEXT20 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
88 inspection events and 3K published inspection hours across the historical record.
OVERSIGHT COVERAGE39 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 18, 2026. 19 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 |
|---|---|---|---|---|---|
| 000000202602499000 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Truck Driver | 0.15× published limitConcentration: 0000.14 · limit: 0000.93Source unit unspecified | Not reported | NO ACTIONInspection F016496 |
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 56.3200Correction of hazardous conditions.2 recent rows ↗30 CFR 56.14100Safety defects; examination, correction and records.3 recent rows ↗30 CFR 56.11001Safe access.1 recent row ↗30 CFR 56.14130Roll-over protective structures (ROPS) and seat belts.1 recent row ↗30 CFR 48.31Hazard training.1 recent row ↗30 CFR 56.11003Construction and maintenance of ladders.1 recent row ↗30 CFR 56.20003Housekeeping.1 recent row ↗30 CFR 56.14105Procedures during repairs or maintenance.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
989057156.3200S&S
516531056.14100(b)Citation
516530956.11001S&S
516530856.14130(e)Citation
516530756.14100(b)Citation
516688156.3200S&S
516688056.14100(b)S&S
516530648.31(a)Order
Coal dust, noise and other contaminants. Silica records above ↑
Respirable dust, <.1mgBulldozer Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgBulldozer 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, <.1mgMechanic
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
15 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors60Jun 4, 2014—Aug 7, 2026mine-keyed
Addresses of Recordidentity · logistics1Jan 4, 2016—Jan 4, 2016mine-keyed
Assessed Violationscompliance · legal289Sep 1, 2015—Aug 6, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal2Dec 8, 2000—Jun 10, 2020mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal21Apr 6, 2016—Jun 16, 2026mine-keyed
Contested Violationscompliance · legal1Dec 10, 2019—Dec 10, 2019mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety2,962Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety591Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance4Jul 1, 1997—Dec 15, 2014mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance137Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance38Not published—Not publishedmine-keyed
Inspectionssafety · compliance88Feb 11, 2014—Oct 5, 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 · safety116Mar 9, 2016—Jun 16, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal294Sep 1, 2015—Oct 6, 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.