Data / Mines / Small Mine Development
Small Mine Development: 2 open mines, 23 MSHA citations
Updated November 6, 2026. Source: US Department of Labor, Mine Safety and Health Administration (MSHA), Open Government Data Sets.
Small Mine Development (MSHA operator ID L12820) operates 2 open mines with 20 employees in California, Nevada, mostly zinc. Since January 1, 2022 MSHA inspectors issued it 23 citations and orders with $5,506 in proposed penalties, and it reported 5 injury or illness cases. Data from MSHA, November 6, 2026.
The request: Watch Small Mine Development (MSHA operator ID L12820): each new citation, each accident report and each new mine. $10 of work on sign-up, no card.
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- MSHA operator ID
- L12820
- Open mines
- 2
- Employees at open mines
- 20
- States
- California, Nevada
- Citations and orders since January 1, 2022
- 23
- Significant and substantial
- 2 (8.7%)
- Closure orders
- 0
- High negligence or reckless
- 0
- Proposed penalties
- $5,506
- Amount paid so far
- $5,506
- Inspections
- 32
- Inspector hours on site
- 275
- Citations per inspection
- 0.72 (all mines 2.30)
- Accident reports
- 5
- Injury and illness cases
- 5
- Fatalities
- 0
- Latest MSHA record
- October 19, 2026
Open mines of Small Mine Development
Ranked by citations since January 1, 2022.
| Mine | Operator | County | Main commodity | Employees | Citations since 2022 |
|---|---|---|---|---|---|
| Blue Moon Underground Mine | Small Mine Development | Mariposa County, CA | Zinc | 5 | 5 |
| Rosebud | Small Mine Development | Pershing County, NV | Gold ore | 15 | 0 |
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 | 13 | 2 | $4,036 | 4 |
| 2023 | 5 | 0 | $715 | 1 |
| 2025 | 1 | 0 | $151 | 0 |
| 2026 | 4 | 0 | $604 | 0 |
Standards cited most at Small Mine Development
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 57.5060 | Underground metal and nonmetal mines | 3 |
| 30 CFR 57.14100 | Underground metal and nonmetal mines | 2 |
| 30 CFR 57.3360 | Underground metal and nonmetal mines | 2 |
| 30 CFR 57.4201 | Underground metal and nonmetal mines | 2 |
| 30 CFR 57.12013 | Underground metal and nonmetal mines | 2 |
| 30 CFR 57.6132 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.6201 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.13001 | Underground metal and nonmetal mines | 1 |
| 30 CFR 47.41 | Hazard communication | 1 |
| 30 CFR 49.3 | Mine rescue teams | 1 |
| 30 CFR 57.14207 | Underground metal and nonmetal mines | 1 |
| 30 CFR 48.9 | Training of miners | 1 |
| 30 CFR 57.3200 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.8525 | Underground metal and nonmetal mines | 1 |
| 30 CFR 57.12028 | Underground metal and nonmetal mines | 1 |
Injury and illness cases at Small Mine Development
Accident reports by degree of injury, as the operator reported them to MSHA.
| Degree | Cases |
|---|---|
| Days away from work or restricted activity | 2 |
| No lost time, or an occupational illness | 3 |
What the accident reports at Small Mine Development describe
Accident classification, as MSHA codes the circumstances that contributed most directly.
| Classification | Reports |
|---|---|
| Slip or fall of person | 3 |
| Powered haulage | 1 |
| Machinery | 1 |
Equipment named in accident reports at Small Mine Development
| Equipment | Reports |
|---|---|
| Forklift | 1 |
| Rock or roof bolting machine | 1 |
Commodities
| Main commodity | Open mines |
|---|---|
| Zinc | 1 |
| Gold ore | 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.