Quartz, ground mines in the US: 11 open mines
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
MSHA lists 11 open quartz, ground mines in the US, run by 10 operators and employing 148 people. Since January 1, 2022 its inspectors issued 177 citations and orders there with $66,171 in proposed penalties, and operators reported 20 injury or illness cases. The operators with the most open mines are The Quartz Corp USA; U.S. Silica Company, LLC; Malvern Minerals Company. Data from MSHA, November 6, 2026.
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- Open mines
- 11
- Operators
- 10
- Employees
- 148
- Active
- 7
- Temporarily Idled
- 2
- Intermittent
- 2
- Mines run by individuals, counted and not listed
- 1
- Citations and orders since January 1, 2022
- 177
- Significant and substantial
- 26 (14.7%)
- Closure orders
- 3
- High negligence or reckless
- 14
- Proposed penalties
- $66,171
- Amount paid so far
- $55,469
- Inspections
- 100
- Inspector hours on site
- 1,328
- Citations per inspection
- 1.77 (all mines 2.30)
- Accident reports
- 20
- Injury and illness cases
- 20
- Fatalities
- 0
- Latest MSHA record
- October 6, 2026
Operators with the most open mines
Ranked by open mines, then by citations. Sole proprietors and individuals are not listed.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| The Quartz Corp USA | 2 | 15 | 11 | $2,733 | 0 |
| U.S. Silica Company, LLC | 1 | 41 | 109 | $55,130 | 5 |
| Malvern Minerals Company | 1 | 19 | 22 | $3,222 | 4 |
| Covia Specialty Minerals, Inc. | 1 | 34 | 12 | $1,816 | 4 |
| York Building Products Co Inc | 1 | 10 | 7 | $906 | 1 |
| Smith Constructors Inc | 1 | 0 | 4 | $610 | 0 |
| TSJ Construction | 1 | 3 | 2 | $302 | 0 |
| Crossfire Aggregate Services, LLC | 1 | 3 | 0 | $0 | 0 |
| Sibelco North America, Inc | 1 | 15 | 0 | $0 | 0 |
Operators with the most citations
Citations and orders issued since January 1, 2022 at their open mines here.
| Operator | Open mines | Employees | Citations since 2022 | Proposed penalties | Injury cases |
|---|---|---|---|---|---|
| U.S. Silica Company, LLC | 1 | 41 | 109 | $55,130 | 5 |
| Malvern Minerals Company | 1 | 19 | 22 | $3,222 | 4 |
| Covia Specialty Minerals, Inc. | 1 | 34 | 12 | $1,816 | 4 |
| The Quartz Corp USA | 2 | 15 | 11 | $2,733 | 0 |
| York Building Products Co Inc | 1 | 10 | 7 | $906 | 1 |
| Smith Constructors Inc | 1 | 0 | 4 | $610 | 0 |
| TSJ Construction | 1 | 3 | 2 | $302 | 0 |
| Crossfire Aggregate Services, LLC | 1 | 3 | 0 | $0 | 0 |
| Sibelco North America, Inc | 1 | 15 | 0 | $0 | 0 |
Mines with the most citations
Open mines, ranked by citations and orders since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Pacific Plant | U.S. Silica Company, LLC | St Louis County, MO | Quartz, ground | 41 | 109 |
| Malvern Minerals Sandstone Quarry | Malvern Minerals Company | Garland County, AR | Quartz, ground | 19 | 22 |
| Elco Plant | Covia Specialty Minerals, Inc. | Alexander County, IL | Quartz, ground | 34 | 12 |
| Pine Mountain Mine | The Quartz Corp USA | Mitchell County, NC | Quartz, ground | 5 | 11 |
| Chesapeake Minerals | York Building Products Co Inc | Cecil County, MD | Quartz, ground | 10 | 7 |
| Rockvale | Smith Constructors Inc | Rutherford County, TN | Quartz, ground | 0 | 4 |
| TSJ Crusher #2 | TSJ Construction | Emery County, UT | Quartz, ground | 3 | 2 |
| Quartz / Feldspar Operation | Sibelco North America, Inc | Mitchell County, NC | Quartz, ground | 15 | 0 |
| Chalk Mountain Mine | The Quartz Corp USA | Mitchell County, NC | Quartz, ground | 10 | 0 |
| Track Jaw Crusher PS330 | Crossfire Aggregate Services, LLC | Archuleta County, CO | Quartz, ground | 3 | 0 |
States
| State | Open mines | Share |
|---|---|---|
| North Carolina | 3 | 27.3% |
| Arkansas | 1 | 9.1% |
| Colorado | 1 | 9.1% |
| Illinois | 1 | 9.1% |
| Maryland | 1 | 9.1% |
| Missouri | 1 | 9.1% |
| South Dakota | 1 | 9.1% |
| Tennessee | 1 | 9.1% |
| Utah | 1 | 9.1% |
Citations and injury cases by year
Calendar years since 2022; 2026 runs to the date of the MSHA files.
| Year | Citations and orders | Significant and substantial | Proposed penalties | Injury and illness cases |
|---|---|---|---|---|
| 2022 | 21 | 2 | $2,934 | 6 |
| 2023 | 90 | 15 | $45,298 | 4 |
| 2024 | 23 | 2 | $7,858 | 1 |
| 2025 | 20 | 3 | $5,508 | 2 |
| 2026 | 23 | 4 | $4,573 | 7 |
Standards cited most at quartz, ground mines
Sections of Title 30 of the Code of Federal Regulations named on the citations, with the part each belongs to.
| Standard | What the part covers | Citations |
|---|---|---|
| 30 CFR 56.14107 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.4201 | Surface metal and nonmetal mines | 8 |
| 30 CFR 56.14100 | Surface metal and nonmetal mines | 8 |
| 30 CFR 57.12028 | Underground metal and nonmetal mines | 8 |
| 30 CFR 56.20003 | Surface metal and nonmetal mines | 7 |
| 30 CFR 56.5001 | Surface metal and nonmetal mines | 7 |
| 30 CFR 57.20003 | Underground metal and nonmetal mines | 7 |
| 30 CFR 56.12032 | Surface metal and nonmetal mines | 6 |
| 30 CFR 56.14112 | Surface metal and nonmetal mines | 6 |
| 30 CFR 47.41 | Hazard communication | 6 |
| 30 CFR 56.12004 | Surface metal and nonmetal mines | 5 |
| 30 CFR 57.11001 | Underground metal and nonmetal mines | 5 |
| 30 CFR 56.12028 | Surface metal and nonmetal mines | 4 |
| 30 CFR 57.18002 | Underground metal and nonmetal mines | 4 |
| 30 CFR 56.11001 | Surface metal and nonmetal mines | 4 |
Injury and illness cases at quartz, ground mines
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 12 |
| No lost time, or an occupational illness | 8 |
What the accident reports at quartz, ground mines describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Handling of materials | 9 |
| Slip or fall of person | 3 |
| Handtools (nonpowered) | 3 |
| Machinery | 2 |
| Fall of roof or back | 1 |
| Disorders (physical agents) | 1 |
| Powered haulage | 1 |
Equipment named in accident reports at quartz, ground mines
| Equipment | Reports |
|---|---|
| Front-end loader | 3 |
| Hand tools (not powered) | 3 |
| Hand tools (powered) | 1 |
| Fan | 1 |
US government work, public domain. Counts come from the MSHA files published on November 6, 2026. An open mine is one MSHA lists as Active, Intermittent, New Mine, Temporarily Idled or NonProducing; 13,673 were open that day. Citations, penalties, inspections and accident reports run from January 1, 2022. A citation is an inspector's allegation and an operator can contest it; the penalty is the amount MSHA first proposed, before any contest or settlement. An operator is the legal entity MSHA assesses, and a parent company is its controller. Mines run by sole proprietors or by individuals are counted in every total and are not named. This page uses MSHA data and is not endorsed or certified by MSHA. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.