Mining Incidents
Search Operators Mines Alerts Research Controllers Fatalgrams About
Countries
Peru Chile
English Español
← Back to search

Twin Bridges: 31 MSHA citations Metal/Non-Metal

Bed Rock Products Inc · Surface
Sea Ranch, Sonoma County, CA  ·  Abandoned
MSHA Mine ID: 0402786

Twin Bridges has $3K in proposed MSHA penalties and $255 outstanding across 0 contested dockets, plus health sampling and the full incident record.

Watch this mine

Email me when a new MSHA incident is filed at Twin Bridges.

Fatalities
0
Total incidents
0
Years on record
—
Latest incident
—
Compliance record
MSHA citations since 2000
31
citations
8
significant & substantial
$3,409
proposed penalties
$3,154
paid to date
93% of proposed penalties paid to date, a $255 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
19
inspections on record
190
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: 190 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Twin Bridges has $3K in proposed MSHA penalties and $255 outstanding across 0 contested dockets.

Penalty disposition
ⓘ Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.
$3K
proposed penalties
$3K
current assessed
$3K
paid to date
$255
outstanding
31 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2008-07-10.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Violation severity profile
ⓘ Shares are computed over citations that carry the MSHA gravity and negligence coding; a small share of records are uncoded.
25.8%
significant & substantial
25.8%
high negligence or reckless
25.8%
reasonably likely or greater
38.7%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 0.0% low, 74.2% moderate, 25.8% high, 0.0% reckless.
Source: MSHA violations gravity and negligence coding, 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: 2005-09-01, 21 years ago
0%
of limit-tested samples over the exposure limit
4
samples
2
limit-tested
Most sampled contaminants
  • Quartz, respirable, >1% Qtz2
  • Respirable dust, <.1mg2
Show the individual readings (4)
Date Contaminant Concentration Limit Conc / limit Occupation
2005-09-01 Respirable dust, <.1mg 0 Truck Driver
2005-09-01 Quartz, respirable, >1% Qtz 0.36 1.02 0.35 Crusher Oper/Worker
2005-09-01 Respirable dust, <.1mg 0 Front-end Loader Operator
2005-09-01 Quartz, respirable, >1% Qtz 0.14 1.15 0.12 Belt Cleaner
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. Gualala Ready Mix 1950 to 1978
  2. Gualala Aggregates Inc 1978 to 2003
  3. Bed Rock Products Inc 2003 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2010 5
2009 4
2008 4
2007 5
2006 5
2005 5
2004 3
2001 1
2000 3
Source: MSHA quarterly employment and production, updated weekly.

Twin Bridges sits in Sonoma County, California, where the Census mining category is 0.0% 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.
Sonoma County, California · Population 485,642
0.0%
Mining share of county employment
$102,840
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
2010 Q4 138 0 0 0.0
2010 Q3 208 0 0 0.0
2010 Q1 62 0 0 0.0
2009 Q4 174 0 0 0.0
2009 Q3 172 0 0 0.0
2009 Q2 130 0 0 0.0
2009 Q1 142 0 0 0.0
2008 Q4 100 0 0 0.0
Show 26 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2008 Q3 246 5 1 20325.2
2008 Q2 186 0 0 0.0
2008 Q1 130 0 0 0.0
2007 Q4 353 0 0 0.0
2007 Q3 560 4 3 7142.9
2007 Q2 318 0 0 0.0
2007 Q1 258 0 0 0.0
2006 Q4 623 0 0 0.0
2006 Q3 893 0 0 0.0
2006 Q2 72 3 1 41666.7
2006 Q1 168 0 0 0.0
2005 Q4 1,071 0 0 0.0
2005 Q3 849 2 0 2355.7
2005 Q2 213 1 0 4694.8
2005 Q1 170 0 0 0.0
2004 Q4 636 0 0 0.0
2004 Q3 348 0 0 0.0
2004 Q2 0 2 0
2004 Q1 0 0 0
2001 Q3 438 3 1 6849.3
2001 Q2 321 0 0 0.0
2001 Q1 44 0 0 0.0
2000 Q4 575 0 0 0.0
2000 Q3 272 10 2 36764.7
2000 Q2 732 0 0 0.0
2000 Q1 370 0 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.