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Glass Mountain Pumice Metal/Non-Metal

Monarch Mountain Minerals & Aggregates, LLC · Surface

Controlled by Quikrete Holdings Inc.

Glass Mountain, Modoc County, CA · Active

MSHA Mine ID: 0404165

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Email me when a new MSHA incident is filed at Glass Mountain Pumice.

Fatalities: 0
Total incidents: 6
Years on record: 2000–2016
Latest incident: Dec 2016

Compliance record

MSHA citations since 2000

196

citations

significant & substantial

$63,319

proposed penalties

$57,929

paid to date

Source: MSHA violations data, updated weekly.

Quarterly safety rates

Citations per million employee-hours, as reported to MSHA

Quarter	Hours worked	Citations	S&S	Per 1M hrs
2025 Q4	2,542	0	0	0.0
2025 Q3	1,942	0	0	0.0
2025 Q2	2,594	0	0	0.0
2025 Q1	1,853	0	0	0.0
2024 Q4	452	0	0	0.0
2024 Q3	1,940	0	0	0.0
2024 Q2	2,312	0	0	0.0
2024 Q1	1,628	0	0	0.0

Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.

No fatalities recorded at this mine.

Reportable incidents

6 on file

2016 · 1 incident

December 15, 2016 CA · Metal/Non-Metal car trimmer, car loader, bin puller, truck loader STEPPING OR KNEELING ON OBJECT

Monarch Mountain Minerals & Aggregates, LLC · Struck against stationary object

The EE had just positioned the rail car in place for material loading. EE locked the brakes up on the rail car and stepped down on the ground to walk back to the rail car loading station, and stepped on the south rail of the rail road track. The rail was slick from the rain and EE's foot slid off the rail sideways causing EE to roll ankle over to the side.

2013 · 2 incidents

September 10, 2013 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON

Monarch Mountain Minerals & Aggregates, LLC · Fall from machine

Employee was releasing brakes on rail car while standing on the rail car plat form. He tripped as he turned around and fell. He injured his left shoulder.

February 21, 2013 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer HANDLING OF MATERIALS

Monarch Mountain Minerals & Aggregates, LLC · Over-exertion (Not Elsewhere Classified)

The employee climbed up the front of the shaker screen where there is no safe access and was cleaning excess material off of the screen chute. When he finished he was climbing down and snagged his glove on the frame of the concrete conveyor causing him to over extend his arm.

2012 · 1 incident

July 6, 2012 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON

Monarch Mountain Minerals & Aggregates, LLC · Fall to the walkway or working surface

I send 2 employees to clear a area of logs. I told them not to lift anything. Send 2 one to hook chain one to unhook chain Cat man was up then one of the employees lifted a branch.

2011 · 1 incident

October 7, 2011 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer OTHER

Glass Mountain Pumice 2004 LLC · Bodily reaction, (Not Elsewhere Classified)

The employee was pulling roots from the inpit feed hopper loading conveyor. He was laying on his stomach and when he stood up, he indicated he felt his knee buckle and felt a sharp pain in his right knee. X-rays of the knee were negative and employee was diagnosed with a sprained right knee, prescribed medication, and provided with some work restrictions.

2000 · 1 incident

April 18, 2000 CA · Metal/Non-Metal forklift operator EXPLODING VESSELS UNDER PRESSURE

Glass Mountain Pumice Inc · Struck by flying object

HE WAS CHANGING THE FRONT FORKLIFT TIRE. IT WAS A SPLIT WHEEL AND HE REMOVED THE WRONG HARDWARE AND THE RIM BLEW APART HITTING HIS LEFT LEG JUST ABOVE THE ANKLE.