Key Takeaway

Darlington Mine is a intermittent surface mine producing Stone, located in Arco, Custer County, ID. It has 47 violations on record (8 S&S) and $10K in proposed penalties. Operated by US Calcium LLC.

Darlington Mine

Intermittent Surface Stone

Operator: US Calcium LLC

Controller: Halycon LLC; Sharp Resources LLC; Patten Resources LLC

Location: Arco, Custer County, ID

Employees: 6

47
Violations
8
S&S Violations
0
Accidents
$10K
Penalties

Recent Violations

View all 47 →
Date Section S&S Negligence Penalty
01/12/2026 56.1000 Non-S&S ModNegligence $151
07/16/2025 50.30(a) Non-S&S ModNegligence $151
04/15/2025 56.14132(b)(1)(i) Non-S&S LowNegligence $151
04/15/2025 56.14107(a) Non-S&S ModNegligence $151
10/08/2024 56.14112(b) Non-S&S LowNegligence $147
02/07/2024 56.14112(b) Non-S&S LowNegligence $147
01/16/2024 50.30(a) Non-S&S HighNegligence $147
10/16/2023 50.30(a) Non-S&S HighNegligence $147
07/16/2023 50.30(a) Non-S&S HighNegligence $147
05/31/2023 47.41(a) Non-S&S ModNegligence $143
05/31/2023 47.41(a) Non-S&S ModNegligence $143
05/31/2023 56.12004 Non-S&S HighNegligence $143
04/16/2023 50.30(a) Non-S&S ModNegligence $143
03/08/2023 56.12004 Non-S&S ModNegligence $143
01/13/2022 56.12030 S&S ModNegligence $378
01/13/2022 56.12004 Non-S&S ModNegligence $133
12/09/2020 56.18002(b) Non-S&S ModNegligence $125
12/09/2020 56.12006 Non-S&S ModNegligence $125
12/09/2020 56.12032 Non-S&S ModNegligence $125
12/09/2020 56.14107(a) Non-S&S ModNegligence $125

Inspections

View all 36 →
Begin End Hours Inspectors
01/12/2026 01/12/2026 8.75 1
04/15/2025 04/16/2025 11.50 1
10/08/2024 10/08/2024 7.25 1
05/21/2024 05/21/2024 5.50 1
05/21/2024 05/21/2024 1.00 1
02/06/2024 02/09/2024 5.50 1
05/30/2023 06/01/2023 23.00 1
03/08/2023 03/08/2023 17.00 1
11/22/2022 11/23/2022 8.50 1
05/31/2022 06/01/2022 12.00 1

Mine Details

MSHA Mine ID1002277
Mine TypeSurface
StatusIntermittent
CommodityStone
SIC DescriptionCrushed, Broken Limestone NEC
Employees6
Days/Week5.0
Hours/Shift8.0
Coordinates43.7933330, -113.4536110
Nearest TownArco

Frequently Asked Questions

How many MSHA violations does Darlington Mine have?

Darlington Mine has 47 MSHA violations on record, of which 8 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $10K.

What type of mine is Darlington Mine?

Darlington Mine is a Surface mine producing Stone, located in Arco, Custer County, ID. It currently has 6 employees.

Has anyone been injured or killed at Darlington Mine?

According to MSHA records, Darlington Mine has 0 reported accident/injury records and 0 fatalities on file.

Who operates Darlington Mine?

Darlington Mine is operated by US Calcium LLC and controlled by Halycon LLC; Sharp Resources LLC; Patten Resources LLC. MSHA Mine ID: 1002277.