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Robison Acosta & Blanton Port. Rock Crus Metal/Non-Metal

Robison Acosta Blanton Portable Rock Crushing · Surface
Controlled by Robert Robison
Vernalis, Calaveras County, CA  ·  Abandoned
MSHA Mine ID: 0405231

MSHA record for Robison Acosta & Blanton Port. Rock Crus (mine ID 0405231). Fatalities, non-fatal incidents grouped by year, current operator and controller, and mine context.

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Fatalities
0
Total incidents
0
Years on record
—
Latest incident
—
Inspection activity
MSHA inspections since 2002
2
inspections on record
8
inspection hours
n/a
citations per 100 inspection hours
ⓘ This rate is recorded citations divided by MSHA inspection hours, per 100 hours. It reflects inspection effort, not mine size or production.
Rate withheld: 8 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Health sampling
ⓘ A sample is a point in time compliance measurement, not an individual exposure history. These figures describe MSHA sampling records and do not establish causation or personal dose.

Metal and nonmetal contaminants (personal samples)
ⓘ Many samples are screening measurements of substances with no applicable exposure limit; they are counted as samples but excluded from every over-limit figure. Over-limit shares use only limit-tested samples.

Last sampled: 2002-04-25, 24 years ago
100%
of limit-tested samples over the exposure limit
1
samples
1
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz11 over
Show the individual readings (1)
Date Contaminant Concentration Limit Conc / limit Occupation
2002-04-25 Quartz, respirable, >1% Qtz 0.31 0.31 1.00 Crusher Oper/Worker
Source: MSHA respirable dust, quartz, and noise sampling records, updated weekly. Metal/nonmetal contaminant figures come from MSHA's Personal Health Samples and Area Samples files (public record), updated weekly.
Ownership history
  1. Robison Acosta Blanton Portable Rock Crushing 1994 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2003 0
2002 3
2000 1
Source: MSHA quarterly employment and production, updated weekly.

Robison Acosta & Blanton Port. Rock Crus sits in Calaveras County, California, where the Census mining category is 0.3% of county employment.

Local economic context
ⓘ County figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.
Calaveras County, California · Population 45,995
0.3%
Mining share of county employment
$79,877
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
Quarterly safety rates
ⓘ Citations per million reported employee-hours. Rates begin in 2000, when MSHA's quarterly employment data starts; earlier incidents are counted but cannot be rate-adjusted. Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
Citations per million employee-hours, as reported to MSHA
Quarter Hours worked Citations S&S Per 1M hrs
2003 Q3 0 0 0
2003 Q2 0 0 0
2002 Q4 765 0 0 0.0
2000 Q4 0 0 0
2000 Q3 1,080 0 0 0.0
2000 Q2 0 0 0
2000 Q1 0 0 0

No reportable incidents on file.

MSHA has no recorded reportable accidents for this mine in the current dataset. New reports appear here within a week of being filed.