MINE DETAILS
Isabella Pearl Mine
MSHA MINE ID2602812
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Isabella Pearl Mine38.58722, -118.17528Open 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
141,636reported 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 | 24,689 | 0.00 | 65 | 1/1 mines reporting |
| 2025 Q2 | 0 | 26,528 | 0.00 | 65 | 1/1 mines reporting |
| 2025 Q3 | 0 | 22,696 | 0.00 | 65 | 1/1 mines reporting |
| 2025 Q4 | 0 | 8,879 | 0.00 | 65 | 1/1 mines reporting |
| 2026 Q1 | 0 | 29,722 | 0.00 | 70 | 1/1 mines reporting |
| 2026 Q2 | 0 | 29,122 | 0.00 | 71 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
140 significant & substantial (S&S)
Accident records
30 records classified as fatality
Proposed penalties · USD
2,140.0014 of 14 violations with amounts
On-site inspection hours
56.254 inspections · 4 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 | 2 | 0 | 302.00 | 1 | 0 | 1 | 7.8 |
| 2025-Q3 | 0 | 0 | — | 2 | 0 | 1 | 6.0 |
| 2025-Q4 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q1 | 5 | 0 | 781.00 | 0 | 0 | 1 | 19.8 |
| 2026-Q2 | 7 | 0 | 1,057.00 | 0 | 0 | 1 | 22.8 |
| 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.
Safety activity
56.23003(b) · $151.00 proposed
56.4201(b) · $151.00 proposed
56.6132(a)(4) · $151.00 proposed
48.23(c)(3) · $151.00 proposed
56.4104(a) · $151.00 proposed
56.4104(b) · $151.00 proposed
56.14207 · $151.00 proposed
Regular Safety and Health Inspection · 22.8 on-site hours
56.14100(b) · $151.00 proposed
56.12032 · $151.00 proposed
56.14112(b) · $151.00 proposed
56.9300(a) · $177.00 proposed
50.30(a) · $151.00 proposed
Regular Safety and Health Inspection · 19.8 on-site hours
MACHINERY · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
While positioning a drill shock sub to attach it to the drill head of a ZT44 drill, employee sustained a crushing injury to three of their left hand fingers. This was caused when the drill steel wrench closed on the employees fingers.
OTHER · INJURIES DUE TO NATURAL CAUSES
Accident narrative
Haul Truck Operator mounted "Volvo R100 #17106 Truck. Appears to have had some sort of medical episode and was found deceased in cab of HT. Operator had not started equipment of Pre-Operational Check. Pending Autopsy of HT Operator.
Non-Chargeable Accident Investigation · 6.0 on-site hours
SLIP OR FALL OF PERSON · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
Employee was pressure washing the underside of the cone crusher. EE was utilizing a 5' ladder, the ladder shifted as EE was descending the ladder causing EE to lose EE's balance falling backwards off the ladder landing on EE's back. EE's left leg became entangled between the rungs of the ladder. Employee had a back contusion.
41.11(d) · $151.00 proposed
56.14112(b) · $151.00 proposed
Regular Safety and Health Inspection · 7.8 on-site hours
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.
—
Gold Resource CorporationcontrolsWalker Lane Minerals CorpoperatesIsabella Pearl Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 2602812Other 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
17 historical accident/injury rows; 0 coded fatalities and 41 lost days across the published record.
ACCIDENT + INJURY RECORD11 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
71 violation rows across the full record; 6 carry an S&S flag and $12,280 appears in current assessed amounts.
ENFORCEMENT ACTIVITY42 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHcontext
Occupational health samples
7 personal; 7 area. 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 EXPOSURE14 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
29K employee hours and 71 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
3 contested-violation rows, 3 civil-penalty docket/decision rows, and 2 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE8 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 CONTEXT8 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
27 inspection events and 719 published inspection hours across the historical record.
OVERSIGHT COVERAGE21 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 2 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 |
|---|---|---|---|---|---|
| 000000202601812300 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Crusher Oper/Worker | 0.24× published limitConcentration: 0000.23 · limit: 0000.96Source unit unspecified | Not reported | NO ACTIONInspection F025513 |
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 56.23003Requirements for written safety program.1 recent row ↗30 CFR 56.4201Inspection.1 recent row ↗30 CFR 56.6132Magazine requirements.1 recent row ↗30 CFR 48.23Training plans; time of submission; where filed; information required; time for approval; method for disapproval; commencement of training; approval of instructors.1 recent row ↗30 CFR 56.4104Combustible waste.2 recent rows ↗30 CFR 56.14207Parking procedures for unattended equipment.1 recent row ↗30 CFR 56.14100Safety defects; examination, correction and records.1 recent row ↗30 CFR 56.12032Inspection and cover plates.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
510374756.23003(b)Citation
510374656.4201(b)Citation
510374556.6132(a)(4)Citation
510374448.23(c)(3)Citation
510374356.4104(a)Citation
510374256.4104(b)Citation
510374156.14207Citation
510349556.14100(b)Citation
Coal dust, noise and other contaminants. Silica records above ↑
Respirable dust, <.1mgFront-end Loader Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Lead, inorganic dustLab Technician
C/E: 00.03Concentration: 0004.00 · limit: 0150.00Source unit unspecified
Respirable dust, <.1mgCrusher Oper/Worker
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgTruck Driver
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgFront-end Loader Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors17Apr 19, 2019—Sep 26, 2025mine-keyed
Addresses of Recordidentity · logistics1Oct 31, 2019—Oct 31, 2019mine-keyed
Assessed Violationscompliance · legal71Aug 8, 2018—Apr 30, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal3Sep 6, 2019—Jul 28, 2023mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal2Sep 11, 2018—Apr 8, 2024mine-keyed
Contested Violationscompliance · legal3Mar 15, 2019—Mar 21, 2023mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety712Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety168Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance1May 29, 2018—May 29, 2018mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance96Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance27Not published—Not publishedmine-keyed
Inspectionssafety · compliance27Aug 7, 2018—Apr 27, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety7Jul 26, 2023—Jul 26, 2023mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety7Aug 9, 2018—Apr 30, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal71Aug 8, 2018—Apr 30, 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.