Key Takeaway

PIONEER JAW is a intermittent surface mine producing SandAndGravel, located in Janesville, Rock County, WI. It has 64 violations on record (10 S&S) and $6K in proposed penalties. Operated by Southern Wisconsin Aggregate Corporation.

PIONEER JAW

Intermittent Surface SandAndGravel

Operator: Southern Wisconsin Aggregate Corporation

Controller: Daniel L Silha

Location: Janesville, Rock County, WI

Employees: 2

64
Violations
10
S&S Violations
1
Accidents
$6K
Penalties

Recent Violations

View all 64 →
Date Section S&S Negligence Penalty
07/08/2025 56.12004 Non-S&S HighNegligence $245
07/08/2025 56.12030 Non-S&S HighNegligence $245
07/08/2025 56.4101 Non-S&S ModNegligence $151
07/08/2025 56.4200(b)(2) Non-S&S ModNegligence $151
04/12/2023 56.12004 Non-S&S ModNegligence $143
04/12/2023 56.12004 Non-S&S ModNegligence $143
05/11/2022 56.12004 Non-S&S ModNegligence $133
11/18/2020 56.14107(a) Non-S&S ModNegligence $123
11/18/2020 56.11012 Non-S&S ModNegligence $123
11/18/2020 56.12004 Non-S&S LowNegligence $123
11/18/2020 56.12032 Non-S&S LowNegligence $123
11/18/2020 56.14100(b) Non-S&S ModNegligence $123
06/07/2017 56.14132(a) Non-S&S ModNegligence $116
06/06/2017 56.14107(a) Non-S&S ModNegligence $116
06/06/2017 56.14100(c) S&S ModNegligence $116
06/06/2017 56.14100(a) S&S ModNegligence $116
06/06/2017 56.12004 Non-S&S ModNegligence $116
07/13/2016 56.12004 Non-S&S ModNegligence $114
07/13/2016 56.4201(a)(2) Non-S&S HighNegligence $114
09/15/2015 56.14112(a)(1) S&S ModNegligence $100

Accidents & Injuries

View all 1 →
Date Classification Injury Days Lost
07/09/2008 HANDLING OF MATERIALS NO DYS AWY FRM WRK,NO RSTR ACT None

Inspections

View all 37 →
Begin End Hours Inspectors
07/07/2025 07/08/2025 9.25 1
08/06/2024 08/06/2024 2.00 1
04/12/2023 04/17/2023 7.00 1
05/11/2022 05/12/2022 8.00 1
11/18/2020 11/20/2020 18.25 1
09/21/2020 09/21/2020 3.75 1
08/25/2020 08/25/2020 1.75 1
07/30/2019 07/30/2019 1.00 1
07/17/2018 07/17/2018 2.00 1
07/05/2017 07/05/2017 4.25 1

Mine Details

MSHA Mine ID4703187
Mine TypeSurface
StatusIntermittent
CommoditySandAndGravel
SIC DescriptionConstruction Sand and Gravel
Employees2
Days/Week5.0
Hours/Shift8.0
Coordinates42.7222220, -88.9930560
Nearest TownJanesville

Related Mines

JANESVILLE PIT AND MILL
Janesville, Rock County, WI
170 violations Active
Portable Unit #1
Janesville, Rock County, WI
136 violations Active
NORDBERG
Janesville, Rock County, WI
118 violations Intermittent
Portable Unit #2
Janesville, Rock County, WI
89 violations Active
Prairie Sand & Gravel
Beloit, Rock County, WI
74 violations Active
Corporate Contractors Inc., Quarry...
Beloit, Rock County, WI
66 violations Intermittent
Portable Plant #3
Janesville, Rock County, WI
59 violations Abandoned
Cronin
Janesville, Rock County, WI
59 violations Intermittent

Frequently Asked Questions

How many MSHA violations does PIONEER JAW have?

PIONEER JAW has 64 MSHA violations on record, of which 10 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $6K.

What type of mine is PIONEER JAW?

PIONEER JAW is a Surface mine producing SandAndGravel, located in Janesville, Rock County, WI. It currently has 2 employees.

Has anyone been injured or killed at PIONEER JAW?

According to MSHA records, PIONEER JAW has 1 reported accident/injury records and 0 fatalities on file.

Who operates PIONEER JAW?

PIONEER JAW is operated by Southern Wisconsin Aggregate Corporation and controlled by Daniel L Silha. MSHA Mine ID: 4703187.