ACTIVE / CONTROLLER PORTFOLIO
Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.
MINE PORTFOLIO
2025-01-01 – 2026-10-17. Active records; production reporting is not required.
Material, method and type filters apply to this table. The portfolio’s status applies to the entire page. GEM fields describe their own release, not the selected MSHA year.
| Mine | Location / type | Coal · short tons | Hours worked | Violations | Accident records | On-site inspection hours |
|---|---|---|---|---|---|---|
| Sierra Silica Resources0405879 · Active | Butte, CASurface · MSHA: Sand, Industrial NEC | — | — | 19 | 0 | 55.8 |
Production and hours sum available quarterly reports. — means unavailable; zero safety records means none in the selected imported period. Ownership reflects the current MSHA record.
LOCATION
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-17. All 1 mines listed under this controller were checked; 0 have reports in the available quarters. Totals use current ownership.
reported short tons
reported employee hours
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.
| 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 |
2025-01-01 – 2026-10-17
3 significant & substantial (S&S)
0 records classified as fatality
19 of 19 violations with amounts
4 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.
| Quarter | Violations | S&S | Proposed USD | Accident records | Fatality records | Inspections | On-site hours |
|---|---|---|---|---|---|---|---|
| 2025-Q1 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2025-Q2 | 5 | 0 | 755.00 | 0 | 0 | 1 | 13.0 |
| 2025-Q3 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2025-Q4 | 3 | 0 | 453.00 | 0 | 0 | 2 | 14.0 |
| 2026-Q1 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q2 | 11 | 3 | 2,164.00 | 0 | 0 | 1 | 28.8 |
| 2026-Q3 | 0 | 0 | — | 0 | 0 | 0 | — |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
All violations issued in the selected period. Counts combine subsections.
56.12004 · $151.00 proposed
56.14107(a) · $151.00 proposed
56.14107(a) · S&S · $226.00 proposed
56.11001 · $151.00 proposed
56.14107(a) · S&S · $226.00 proposed
56.14107(a) · $151.00 proposed
56.14112(b) · $151.00 proposed
56.12030 · $151.00 proposed
56.20003(a) · $151.00 proposed
56.12004 · $151.00 proposed
56.18002 · S&S · $504.00 proposed
Regular Safety and Health Inspection · 28.8 on-site hours
Compliance Follow-up Inspection · 1.0 on-site hours
56.17001 · $151.00 proposed
56.14107(a) · $151.00 proposed
Regular Safety and Health Inspection · 13.0 on-site hours
56.14107(a) · $151.00 proposed
56.23002(a) · $151.00 proposed
56.20003(a) · $151.00 proposed
Regular Safety and Health Inspection · 13.0 on-site hours
56.11004 · $151.00 proposed
56.4203 · $151.00 proposed
56.14207 · $151.00 proposed
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-17.
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.
SELECTED PORTFOLIO
Relationships reflect the selected mine status and current MSHA controller/operator fields.