Establishment profile
MARIPOSA - YOSEMITE SLATE QUARRY
5027 AGUA FRIA RD, MARIPOSA, CA, 95338
212311 — Dimension Stone Mining and Quarrying
Summary
MARIPOSA - YOSEMITE SLATE QUARRY has accumulated 1 OSHA violation across 5 inspections over 12 years of recorded history.
The establishment sits in the 31st percentile for violations within its industry-state peer group of 1,680 employers. Inspection frequency runs at the 70th percentile. The most recent enforcement activity was recorded 1 months ago.
Federal records were found in 2 of 15 sources. Sources without matching records returned empty for this establishment.
Agency coverage
MARIPOSA - YOSEMITE SLATE QUARRY appears in OSHA workplace safety and MSHA mine safety records only. No matching records were found in WHD wage enforcement, EPA environmental compliance, NLRB labor relations, OFLC visa and labor certification (historical), FMCSA motor carrier registration, SAM.gov federal debarment, CMS nursing home enforcement, UVA Corporate Prosecution Registry, CPSC product recalls, or NHTSA vehicle recalls.
OSHA workplace safety
20% of inspections at this establishment produced violations,
Most-cited OSHA standards
Top OSHA standards cited at this employer, ranked by citation count. Standards (CFR sections) cluster citations into safety themes -- machine guarding, lockout-tagout, hazard communication, fall protection, process safety, etc. A concentration on one or two sections reveals a pattern that individual citations don’t. 1 distinct standard shown · 1 citation in this view.
| CFR section | Citations | Inspections | Total penalty | First cited | Last cited |
|---|---|---|---|---|---|
| 3203 A | 1 | 1 | — | Nov 2013 | Nov 2013 |
Source: OSHA inspection citations (violation_detail). CFR section codes can be looked up at osha.gov/laws-regs for the formal standard text. Per-inspection detail and the specific violation descriptions are available by expanding individual inspections below.
Peer comparison
Below average violations in NAICS 2123 within CA. Peer group: 1,680 employers. This establishment has 1 OSHA violation; peer median is 2.
Safety self-report (OSHA 300A)
No self-reported injury rates filed with OSHA's Injury Tracking Application for MARIPOSA - YOSEMITE SLATE QUARRY. Verify directly with OSHA Injury Tracking Application →
Industry benchmark
BLS rates reflect industry-wide averages. Self-reported figures come from OSHA’s Injury Tracking Application; absence of self-reported data does not necessarily indicate non-compliance — many establishments fall below the ITA reporting threshold.
Inspection breakdown
Complaint- and accident-triggered inspections are stronger risk signals than routine planned inspections.
OSHA severe injury reports
No severe injury reports (hospitalization, amputation, or loss of an eye) on file under 29 CFR 1904.39 for MARIPOSA - YOSEMITE SLATE QUARRY. Verify directly with Occupational Safety and Health Administration →
Activity timeline
Most recent federal enforcement activity recorded 1 months ago. Data on this page is refreshed weekly.
Wage & Hour Division (WHD)
No WHD wage, overtime, or child-labor enforcement cases on file for MARIPOSA - YOSEMITE SLATE QUARRY. Verify directly with Wage and Hour Division →
Mine safety (MSHA)
Company-level in CA — for MARIPOSA - YOSEMITE SLATE QUARRY, not this location alone
Mine Safety & Health Administration — citations issued at mining operations. MSHA records cases at the company/regional level (no worksite address), so these are matched by company name and state and may span other MARIPOSA - YOSEMITE SLATE QUARRY operations in the same state.
MSHA citations
Mine Safety and Health Administration citations. S&S (significant and substantial) marks violations that could reasonably contribute to a serious injury. Negligence rating is MSHA’s operator-culpability assessment (none, low, moderate, high, or reckless disregard). Proposed = assessed at issuance; Paid = post-settlement / appeal. 10 citations · 3S&S · $1,726 proposed / $1,396 paid.
| Citation | Mine | Date | Section | S&S | Negligence | Proposed | Paid |
|---|---|---|---|---|---|---|---|
| 8879835 | Yosemite Slate Quarry Mariposa, CA | Oct 2016 | — | Yes | ModNegligence | $300 | $231 |
| 8611482 | Yosemite Slate Quarry Mariposa, CA | May 2014 | — | Yes | HighNegligence | $263 | $263 |
| 8698636 | Yosemite Slate Quarry Mariposa, CA | Feb 2013 | — | Yes | LowNegligence | $243 | $100 |
| 9890035 | Yosemite Slate Quarry Mariposa, CA | Jun 2024 | — | No | LowNegligence | $147 | $147 |
| 9890034 | Yosemite Slate Quarry Mariposa, CA | Jun 2024 | — | No | LowNegligence | $147 | $147 |
| 9890033 | Yosemite Slate Quarry Mariposa, CA | Jun 2024 | — | No | LowNegligence | $147 | $147 |
| 9890032 | Yosemite Slate Quarry Mariposa, CA | Jun 2024 | — | No | LowNegligence | $147 | $147 |
| 9377291 | Yosemite Slate Quarry Mariposa, CA | Dec 2017 | — | No | ModNegligence | $118 | — |
| 8879605 | Yosemite Slate Quarry Mariposa, CA | Jun 2016 | — | No | ModNegligence | $114 | $114 |
| 8793349 | Yosemite Slate Quarry Mariposa, CA | Oct 2015 | — | No | ModNegligence | $100 | $100 |
Source: MSHA citation database. “Contractor” annotations indicate the cited party was on-site at the mine but not the mine’s operator -- responsibility attaches to the contractor LLC, not the mine’s owner. Section codes reference 30 CFR (the Mine Safety and Health regulations).
Labor relations (NLRB)
No NLRB unfair labor practice charges or union representation cases on file for MARIPOSA - YOSEMITE SLATE QUARRY. Verify directly with National Labor Relations Board →
Visa & labor certification (OFLC) — historical
No H-1B, H-2A, or H-2B labor condition applications on file (historical data only — DOL ended OFLC publication) for MARIPOSA - YOSEMITE SLATE QUARRY. Verify directly with Office of Foreign Labor Certification →
Environmental compliance (EPA)
No EPA inspections or formal enforcement actions on file for MARIPOSA - YOSEMITE SLATE QUARRY. Verify directly with Environmental Protection Agency →
Federal criminal prosecution record
No federal criminal prosecutions, plea agreements, or deferred-prosecution agreements on file for MARIPOSA - YOSEMITE SLATE QUARRY. Verify directly with UVA Corporate Prosecution Registry →
Inspection history
| Date | Trigger | Violations | Serious | Penalty | |
|---|---|---|---|---|---|
| 2026-04-29 | Planned | 0 | — | $0 | |
| 2025-11-07 | Planned | 0 | — | $0 | |
| 2025-04-29 | Planned | 0 | — | $0 | |
| 2015-04-28 | Planned | 0 | — | $0 | |
| 2013-11-05 | Planned | 1 | — | $0 |
Source: OSHA IMIS. Citation amounts reflect initially assessed penalties; final amounts after appeal may differ.
In the news
Other employers in this industry and state
Other employers in dimension stone mining and quarrying within CA, ordered by federal enforcement volume:
- GRANITE ROCK COMPANYAROMAS — 3 federal enforcement records
- ROCK STRUCTURES CONSTRUCTION COMPANYCORONA — 2 federal enforcement records
- SANFORD STONE QUARRY INCRED MOUNTAIN — 2 federal enforcement records
- NATIONAL QUARRIESSAN MARCOS — 2 federal enforcement records
- WYROC INCAPPLE VALLEY — 2 federal enforcement records
- MARIPOSA FLAGSTONE COMPANYMARIPOSA — 2 federal enforcement records
- CLEARLAKE LAVA, INC.CLEARLAKE OAKS — 2 federal enforcement records
- EAGLE ROCK, INC.JUNCTION CITY — 2 federal enforcement records
- ROCK STRUCTURES CONSTRUCTION COMPANYLAKE ELSINORE — 2 federal enforcement records
- CLEARLAKE LAVA, INC.LOWER LAKE — 2 federal enforcement records
Related searches
- Dimension Stone Mining and QuarryingAll employers in this industry
- Employers in CAState-wide enforcement data
- Dimension Stone Mining in CAIndustry × state cross-filter
About this data
This profile aggregates federal enforcement records on MARIPOSA - YOSEMITE SLATE QUARRY from every major federal compliance and enforcement source plus the UVA Corporate Prosecution Registry. OSHA workplace safety inspections, WHD wage cases, MSHA mine safety, EPA environmental enforcement, NLRB labor relations, OFLC visa/labor certification, FMCSA motor carrier registration, SAM.gov debarments, CMS nursing-home records, BLS industry safety benchmarks, OSHA ITA self-reported injury rates, SEC enforcement and financial disclosures, CPSC and NHTSA recalls.
Establishments are matched across agencies using normalized employer name, state, and ZIP code.
OSHA citations typically appear 3–8 months after the inspection, so very recent enforcement actions may not yet be reflected. Profiles may be incomplete if the establishment operates under multiple legal names or files under variations our entity-matching rules don’t yet cover. To report a missing record or correction, email corrections@fastdol.com.
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Contact sales →Frequently asked
- What is MARIPOSA - YOSEMITE SLATE QUARRY's OSHA violation history?
- MARIPOSA - YOSEMITE SLATE QUARRY has 5 OSHA inspections on record with 1 violation and $0 in total penalties.
- How does MARIPOSA - YOSEMITE SLATE QUARRY's safety record compare to its industry?
- MARIPOSA - YOSEMITE SLATE QUARRY operates in the dimension stone mining and quarrying industry. The industry average Total Recordable Incident Rate (TRIR) is 1.8.