LAS VEGAS, NV — 2025-03-18 00:00:00

OSHA Inspection: MAMMOTH UNDERGROUND LLC

Referral inspection · Safety discipline

At a glance

On 2025-03-18 00:00:00, OSHA opened a referral safety inspection of MAMMOTH UNDERGROUND LLC in 9545 ARVILLE ST, LAS VEGAS, NV 89139 (NAICS 237110). OSHA activity number 348115114.

What this inspection record means

OSHA opens inspections for many reasons — routine scheduling under a national or local emphasis program, an employee complaint or referral, or a follow-up after a reported injury. Opening or conducting an inspection is not itself an allegation or a finding that this employer broke any rule; any findings appear as the citations listed below, and citations can be contested, reduced, or withdrawn.

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Where did this inspection happen?

Establishment: MAMMOTH UNDERGROUND LLC
Site address: 9545 ARVILLE ST
City: LAS VEGAS
State: NV
ZIP: 89139
Mailing: 421 WEST BONANZA ROAD, LAS VEGAS, NV 89106

What kind of inspection was it?

Inspection type: Referral (C)
Scope: Partial (B)
Discipline: Safety
Advance notice: No
Union status: B

When did the case open and close?

Opened: 2025-03-18 00:00:00
Closing conference: 2025-04-24 00:00:00
Case closed: 2025-07-25 00:00:00
Last modified: 2026-07-21 00:00:00
Data loaded: 2026-07-22 00:20:17

Establishment context

NAICS code: 237110
Employees: 5
Ownership type: A

Citations

1 citation on file for this inspection.

1926.652 A01

Serious Gravity 5 1 instance 1 exposed

Issued: Jun 17, 2025
Penalty: Initial $10,641 · Current $5,321 Reduced

Recent events (2)

2025-07-25 00:00:00 — I (S) $5320.5
2025-06-17 00:00:00 — Z (S) $10641

More inspections at Mammoth Underground LLC

Mar 31, 2026 LAS VEGAS, NV Dec 3, 2024 LAS VEGAS, NV Nov 4, 2024 LAS VEGAS, NV Oct 2, 2023 LAS VEGAS, NV Jun 22, 2018 NORTH LAS VEGAS, NV

View Mammoth Underground LLC's full OSHA safety record →

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Source

This record is reproduced from the U.S. Department of Labor Open Data API (OSHA inspection dataset). The original IMIS detail view is available at OSHA's Establishment Search for activity number 348115114.

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