Key Takeaway

Glass Mountain Pumice is a active surface mine producing Nonmetal, located in Glass Mountain, Modoc County, CA. It has 196 violations on record (60 S&S) and $63K in proposed penalties. Operated by Monarch Mountain Minerals & Aggregates, LLC.

Glass Mountain Pumice

Active Surface Nonmetal

Operator: Monarch Mountain Minerals & Aggregates, LLC

Controller: Quikrete Holdings Inc.

Location: Glass Mountain, Modoc County, CA

Employees: 7

196
Violations
60
S&S Violations
6
Accidents
$63K
Penalties

Recent Violations

View all 196 →
Date Section S&S Negligence Penalty
10/11/2023 56.12030 Non-S&S ModNegligence $143
06/06/2023 Non-S&S $0
06/06/2023 56.15005 S&S ModNegligence $1,385
06/06/2023 56.11001 S&S ModNegligence $621
07/13/2022 56.4130(a)(2) Non-S&S ModNegligence $133
07/12/2022 56.14107(a) Non-S&S ModNegligence $133
07/12/2022 56.14107(a) Non-S&S ModNegligence $133
11/05/2019 56.14100(b) Non-S&S ModNegligence $121
11/05/2019 56.12004 Non-S&S ModNegligence $121
08/21/2019 56.14107(a) Non-S&S ModNegligence $121
08/21/2019 56.14207 Non-S&S ModNegligence $121
11/14/2018 56.14101(a)(2) Non-S&S ModNegligence $118
11/14/2018 56.14107(a) Non-S&S ModNegligence $118
06/20/2018 56.14201(b) S&S ModNegligence $208
06/20/2018 56.14132(a) Non-S&S LowNegligence $118
06/20/2018 56.4201(a)(2) Non-S&S LowNegligence $118
01/09/2018 56.14207 Non-S&S ModNegligence $118
11/15/2016 56.12028 Non-S&S ModNegligence $114
06/08/2016 56.16006 Non-S&S ModNegligence $114
06/08/2016 56.14207 Non-S&S ModNegligence $114

Accidents & Injuries

View all 6 →
Date Classification Injury Days Lost
12/15/2016 STEPPING OR KNEELING ON OBJECT DAYS AWAY FROM WORK ONLY 2d lost
09/10/2013 SLIP OR FALL OF PERSON DAYS AWAY FROM WORK ONLY 4d lost
02/21/2013 HANDLING OF MATERIALS DAYS AWAY FROM WORK ONLY 8d lost
07/06/2012 SLIP OR FALL OF PERSON DYS AWY FRM WRK & RESTRCTD ACT 12d lost, 16d restricted
10/07/2011 OTHER DAYS RESTRICTED ACTIVITY ONLY 95d restricted
04/18/2000 EXPLODING VESSELS UNDER PRESSURE DAYS AWAY FROM WORK ONLY 45d lost

Inspections

View all 53 →
Begin End Hours Inspectors
02/23/2026 02/24/2026 13.50 1
06/16/2025 06/17/2025 13.25 1
03/04/2025 03/12/2025 23.50 1
05/15/2024 05/21/2024 11.00 1
10/10/2023 10/12/2023 20.00 1
06/05/2023 06/06/2023 19.00 1
10/31/2022 11/02/2022 24.75 1
07/11/2022 07/14/2022 37.50 1
03/21/2022 03/24/2022 27.00 1
04/05/2021 04/21/2021 16.75 1

Mine Details

MSHA Mine ID0404165
Mine TypeSurface
StatusActive
CommodityNonmetal
SIC DescriptionPumice
Employees7
Days/Week5.0
Hours/Shift10.0
Coordinates41.6444440, -121.3275000
Nearest TownGlass Mountain

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Frequently Asked Questions

How many MSHA violations does Glass Mountain Pumice have?

Glass Mountain Pumice has 196 MSHA violations on record, of which 60 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $63K.

What type of mine is Glass Mountain Pumice?

Glass Mountain Pumice is a Surface mine producing Nonmetal, located in Glass Mountain, Modoc County, CA. It currently has 7 employees.

Has anyone been injured or killed at Glass Mountain Pumice?

According to MSHA records, Glass Mountain Pumice has 6 reported accident/injury records and 0 fatalities on file.

Who operates Glass Mountain Pumice?

Glass Mountain Pumice is operated by Monarch Mountain Minerals & Aggregates, LLC and controlled by Quikrete Holdings Inc.. MSHA Mine ID: 0404165.