Coal production
0reported short tons
ACTIVE / OPERATOR PORTFOLIO
Knife River - South Dakota
Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.
MSHA OPERATOR IDL15666
MINE PORTFOLIO
3 of 3 mines and facilities
2025-01-01 – 2026-10-13. 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 |
|---|---|---|---|---|---|---|
| Corson Sand Plant / Quarry3901478 · Active6/8 quarters reported | Minnehaha, SDSurface · MSHA: Quartz, Ground | 0 | 35,283 | 12 | 3 | 45.8 |
| Knife River Portable Plant SD-13900292 · Active6/8 quarters reported | Minnehaha, SDSurface · MSHA: Construction Sand and Gravel | 0 | 14,009 | 0 | 0 | 12.3 |
| Sioux Falls Quarry3900008 · Active6/8 quarters reported | Minnehaha, SDSurface · MSHA: Crushed, Broken Quartzite | 0 | 128,666 | 20 | 2 | 92.3 |
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
Portfolio map
3 of 3 mines with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Corson Sand Plant / Quarry43.62444, -96.57167Open map ↗
- Knife River Portable Plant SD-142.93806, -97.33194Open map ↗
- Sioux Falls Quarry43.55833, -96.76694Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-13. All 3 mines listed under this operator were checked; 3 have reports in the available quarters. Totals use current ownership.
Hours worked
177,958reported 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 | 26,160 | 0.00 | 73 | 3/3 mines reporting |
| 2025 Q2 | 0 | 36,273 | 0.00 | 78 | 3/3 mines reporting |
| 2025 Q3 | 0 | 33,702 | 0.00 | 78 | 3/3 mines reporting |
| 2025 Q4 | 0 | 25,538 | 0.00 | 81 | 3/3 mines reporting |
| 2026 Q1 | 0 | 20,965 | 0.00 | 71 | 3/3 mines reporting |
| 2026 Q2 | 0 | 35,320 | 0.00 | 81 | 3/3 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
323 significant & substantial (S&S)
Accident records
50 records classified as fatality
Proposed penalties · USD
5,383.0032 of 32 violations with amounts
On-site inspection hours
150.2511 inspections · 11 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 | 7 | 1 | 1,251.00 | 0 | 0 | 2 | 37.3 |
| 2025-Q3 | 0 | 0 | — | 2 | 0 | 1 | 3.8 |
| 2025-Q4 | 5 | 0 | 755.00 | 0 | 0 | 1 | 10.8 |
| 2026-Q1 | 1 | 0 | 151.00 | 1 | 0 | 2 | 19.5 |
| 2026-Q2 | 19 | 2 | 3,226.00 | 0 | 0 | 3 | 61.0 |
| 2026-Q3 | 0 | 0 | — | 2 | 0 | 2 | 18.0 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
- Sioux Falls Quarry · 3900008
Spot Inspection · 12.8 on-site hours
- Knife River Portable Plant SD-1 · 3900292
Regular Safety and Health Inspection · 5.3 on-site hours
- Corson Sand Plant / Quarry · 3901478
DISORDERS (PHYSICAL AGENTS) · OCCUPATNAL ILLNESS NOT DEG 1-6
Accident narrative
Employee setting concrete forms reported feeling ill after lunch. Supervisor suspected heat-related symptoms, placed employee in vehicle with cool air, provided water and electrolytes, and observed EE for the remainder of the shift. Symptoms returned that evening; employee went to the ER, was diagnosed with dehydration, and received treatment and observation.
- Corson Sand Plant / Quarry · 3901478
HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY
Accident narrative
Moving crane pad into position, individual strained their lower back.
- Sioux Falls Quarry · 3900008
56.4011 · $151.00 proposed
- Sioux Falls Quarry · 3900008
56.12018 · $151.00 proposed
- Sioux Falls Quarry · 3900008
56.12004 · $151.00 proposed
- Sioux Falls Quarry · 3900008
56.11012 · $151.00 proposed
- Sioux Falls Quarry · 3900008
56.14101(a)(2) · $151.00 proposed
- Sioux Falls Quarry · 3900008
56.12028 · $151.00 proposed
- Sioux Falls Quarry · 3900008
56.12018 · $177.00 proposed
- Sioux Falls Quarry · 3900008
56.12004 · $151.00 proposed
- Sioux Falls Quarry · 3900008
56.12019 · $151.00 proposed
- Sioux Falls Quarry · 3900008
56.14103(b) · $151.00 proposed
- Sioux Falls Quarry · 3900008
56.11017 · $151.00 proposed
- Sioux Falls Quarry · 3900008
56.20003(a) · S&S · $267.00 proposed
- Sioux Falls Quarry · 3900008
Regular Safety and Health Inspection · 39.5 on-site hours
- Corson Sand Plant / Quarry · 3901478
Compliance Follow-up Inspection · 2.0 on-site hours
- Corson Sand Plant / Quarry · 3901478
56.11012 · S&S · $366.00 proposed
- Corson Sand Plant / Quarry · 3901478
56.14132(a) · $151.00 proposed
- Corson Sand Plant / Quarry · 3901478
56.4201(a)(2) · $151.00 proposed
- Corson Sand Plant / Quarry · 3901478
56.14209(b) · $151.00 proposed
- Corson Sand Plant / Quarry · 3901478
Regular Safety and Health Inspection · 19.5 on-site hours
- Corson Sand Plant / Quarry · 3901478
56.4201(a)(2) · $151.00 proposed
- Corson Sand Plant / Quarry · 3901478
56.14100(c) · $151.00 proposed
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.
SELECTED PORTFOLIO
1 linked controller.
Relationships reflect the selected mine status and current MSHA controller/operator fields.