ACTIVE / OPERATOR PORTFOLIO

Mathy Constr. Co. DBA Northland Constrs. of Duluth

Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.

MSHA OPERATOR IDL16472

MINE PORTFOLIO

24 of 24 mines and facilities

2025-01-01 – 2026-10-18. Active records; production reporting is not required.

Material, method and type filters apply to this table. The portfolio’s status applies to the entire page. GEM fields describe their own release, not the selected MSHA year.

Mine	Location / type	Hours worked	Violations	Accident records	On-site inspection hours
Plant #284703084 · Active6/8 quarters reported	La Crosse, WISurface · MSHA: Construction Sand and Gravel	18,192	1	1	22.0
Plant #304702873 · Active6/8 quarters reported	La Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC	14,676	3	0	32.0
Plant #324702405 · Active6/8 quarters reported	Monroe, WISurface · MSHA: Crushed, Broken Limestone NEC	23,658	4	0	25.0
Plant #382100777 · Active6/8 quarters reported	La Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC	19,363	2	1	11.3
Plant #392103088 · Active6/8 quarters reported	La Crosse, WISurface · MSHA: Construction Sand and Gravel	20,756	0	1	13.5
Plant #404703038 · Active6/8 quarters reported	La Crosse, WISurface · MSHA: Construction Sand and Gravel	4,934	0	0	8.0
Plant #424701724 · Active6/8 quarters reported	Sauk, WISurface · MSHA: Crushed, Broken Limestone NEC	20,283	1	0	19.0
Plant #444701730 · Active6/8 quarters reported	Sauk, WISurface · MSHA: Crushed, Broken Limestone NEC	19,610	0	1	13.8
Plant #454702874 · Active6/8 quarters reported	Sauk, WISurface · MSHA: Crushed, Broken Limestone NEC	18,259	0	1	18.8
Plant #484700201 · Active6/8 quarters reported	Sauk, WISurface · MSHA: Crushed, Broken Limestone NEC	17,954	0	0	13.8
Plant #534703196 · Active6/8 quarters reported	La Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC	27,504	0	0	17.3
Plant #614703235 · Active6/8 quarters reported	La Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC	21,134	3	0	14.8
Plant #642103264 · Active6/8 quarters reported	Wabasha, MNSurface · MSHA: Crushed, Broken Limestone NEC	19,931	4	0	17.3
Plant #664703274 · Active6/8 quarters reported	La Crosse, WISurface · MSHA: Crushed, Broken Limestone NEC	20,644	6	0	39.8
Plant 764703505 · Active6/8 quarters reported	La Crosse, WISurface · MSHA: Construction Sand and Gravel	6,298	0	0	8.3
Plant 804703609 · Active6/8 quarters reported	Dunn, WISurface · MSHA: Sand, Common	25,382	1	0	25.5
Plant #814703467 · Active6/8 quarters reported	St Croix, WISurface · MSHA: Construction Sand and Gravel	16,961	0	0	16.5
Plant 824703639 · Active6/8 quarters reported	La Crosse, WISurface · MSHA: Construction Sand and Gravel	22,732	1	0	16.0
PLANT 834703640 · Active6/8 quarters reported	La Crosse, WISurface · MSHA: Construction Sand and Gravel	20,250	0	0	11.3
Plant 844703641 · Active6/8 quarters reported	La Crosse, WISurface · MSHA: Construction Sand and Gravel	20,901	0	0	14.3
Plant #854703786 · Active6/8 quarters reported	Sauk, WISurface · MSHA: Crushed, Broken Limestone NEC	24,043	0	0	14.3
Plant #864703452 · Active6/8 quarters reported	Sauk, WISurface · MSHA: Crushed, Broken Limestone NEC	11,546	0	0	8.5
Plant 874703663 · Active6/8 quarters reported	La Crosse, WISurface · MSHA: Construction Sand and Gravel	23,724	0	0	17.8
Plant #914703679 · Active6/8 quarters reported	Jackson, WISurface · MSHA: Construction Sand and Gravel	15,882	1	2	12.3

Production and hours sum available quarterly reports. — means unavailable; zero safety records means none in the selected imported period. Ownership reflects the current MSHA record.

LOCATION

Portfolio map

24 of 24 mines with usable MSHA coordinates. Select a marker to open a mine.

Mine coordinates

Plant #2843.89639, -91.22500Open map ↗
Plant #3043.89639, -91.22500Open map ↗
Plant #3243.89639, -91.22500Open map ↗
Plant #3843.89639, -91.22500Open map ↗
Plant #3943.89639, -91.22500Open map ↗
Plant #4043.89639, -91.22500Open map ↗
Plant #4243.27972, -90.04417Open map ↗
Plant #4443.27972, -90.04417Open map ↗
Plant #4543.27972, -90.04417Open map ↗
Plant #4843.27972, -90.04417Open map ↗
Plant #5343.89639, -91.22500Open map ↗
Plant #6143.89639, -91.22500Open map ↗
Plant #6443.91028, -89.63722Open map ↗
Plant #6643.89639, -91.22500Open map ↗
Plant 7643.89639, -91.22500Open map ↗
Plant 8044.42722, -91.53833Open map ↗
Plant #8144.77556, -91.55139Open map ↗
Plant 8243.89806, -91.22389Open map ↗
PLANT 8343.74861, -92.14778Open map ↗
Plant 8445.38833, -92.32278Open map ↗
Plant #8543.88528, -90.69056Open map ↗
Plant #8643.27972, -90.04417Open map ↗
Plant 8743.93306, -91.17583Open map ↗
Plant #9144.90750, -92.07056Open map ↗

Quarterly trends

2025 Q1 – 2026 Q4

JSON CSV

Database snapshot · 2026-10-18. All 24 mines listed under this operator were checked; 24 have reports in the available quarters. Totals use current ownership.

Coal production

reported short tons

2025 Q10
2025 Q20
2025 Q30
2025 Q40
2026 Q10
2026 Q20
2026 Q3—No usable value reported
2026 Q4 *—No usable value reported

Hours worked

454,617

reported employee hours

2025 Q153,610
2025 Q290,127
2025 Q392,511
2025 Q472,895
2026 Q155,414
2026 Q290,060
2026 Q3—No usable value reported
2026 Q4 *—No usable value reported

Tons per hour

0.00

production ÷ hours worked

2025 Q10.00
2025 Q20.00
2025 Q30.00
2025 Q40.00
2026 Q10.00
2026 Q20.00
2026 Q3—No usable value reported
2026 Q4 *—No usable value reported

Missing values appear as —. Totals use available reports. Tons per hour requires production and hours for the same quarters and a nonzero hours total. * Striped bars mark partial mine coverage or an incomplete quarter. See the table for coverage.

Quarterly data and reporting coverage

Quarterly production, employment and reporting coverage for River City Stone Division Of Mathy Construction Co
Quarter	Coal (short tons)	Hours worked	Tons / hour	Avg. employees	Coverage
2025 Q1	0	53,610	0.00	74	24/24 mines reporting
2025 Q2	0	90,127	0.00	121	24/24 mines reporting
2025 Q3	0	92,511	0.00	123	24/24 mines reporting
2025 Q4	0	72,895	0.00	96	24/24 mines reporting
2026 Q1	0	55,414	0.00	74	24/24 mines reporting
2026 Q2	0	90,060	0.00	121	24/24 mines reporting
2026 Q3	—	—	—	—	No report
2026 Q4	—	—	—	—	No report

Safety and enforcement

2025-01-01 – 2026-10-18

Violations

2 significant & substantial (S&S)

2025 Q16
2025 Q27
2025 Q310
2025 Q41
2026 Q11
2026 Q22
2026 Q30
2026 Q4 *0

Accident records

0 records classified as fatality

2025 Q10
2025 Q21
2025 Q32
2025 Q42
2026 Q10
2026 Q22
2026 Q30
2026 Q4 *0

Proposed penalties · USD

5,059.00

27 of 27 violations with amounts

2025 Q1906
2025 Q21,548
2025 Q32,001
2025 Q4151
2026 Q1151
2026 Q2302
2026 Q3—
2026 Q4 *—

On-site inspection hours

410.50

88 inspections · 88 with hours

2025 Q1108.50
2025 Q215.00
2025 Q353.00
2025 Q455.75
2026 Q169.25
2026 Q252.75
2026 Q356.25
2026 Q4 *0.00

Counts are published records, including contractor records. * The quarter was incomplete at the snapshot date; recent counts may rise as reports arrive. — means no reported amount or hours. Portfolio totals use current membership.

Quarterly safety data

Quarter	Violations	S&S	Proposed USD	Accident records	Inspections	On-site hours
2025-Q1	6	0	906.00	0	17	108.5
2025-Q2	7	1	1,548.00	1	3	15.0
2025-Q3	10	1	2,001.00	2	17	53.0
2025-Q4	1	0	151.00	2	15	55.8
2026-Q1	1	0	151.00	0	15	69.3
2026-Q2	2	0	302.00	2	10	52.8
2026-Q3	0	0	—	0	10	56.3
2026-Q4 *	0	0	—	0	1	0.0

Most cited CFR sections

All violations issued in the selected period. Counts combine subsections.

Section	Violations	S&S
30 CFR 56.12004Electrical conductors.	4	1
30 CFR 56.14107Moving machine parts.	4	0
30 CFR 56.14132Horns and backup alarms.	3	0
30 CFR 56.12018Identification of power switches.	2	0
30 CFR 56.14101Brakes.	2	0
30 CFR 56.14209Safety procedures for towing.	2	0
30 CFR 56.4402Safety can use.	2	0
30 CFR 46.9Records of training.	1	0
30 CFR 56.12008Insulation and fittings for power wires and cables.	1	0
30 CFR 56.14100Safety defects; examination, correction and records.	1	0

Safety activity

inspection2025-07-23F02BC32
Plant #38 · 2100777
Regular Safety and Health Inspection · 4.8 on-site hours
inspection2025-07-23F02C850
Plant #30 · 4702873
Regular Safety and Health Inspection · 4.0 on-site hours
inspection2025-07-23F02BC31
Plant #53 · 4703196
Regular Safety and Health Inspection · 5.0 on-site hours
violation2025-07-235100049
Plant #30 · 4702873
56.12004 · S&S · $642.00 proposed
violation2025-07-235100048
Plant #30 · 4702873
56.14107(a) · $151.00 proposed
inspection2025-07-22F02BC30
Plant 87 · 4703663
Regular Safety and Health Inspection · 1.8 on-site hours
inspection2025-07-21F01F835
Plant #81 · 4703467
Regular Safety and Health Inspection · 2.5 on-site hours
inspection2025-07-14F006988
Plant #30 · 4702873
Spot Inspection · 0.5 on-site hours
inspection2025-07-10F006986
Plant #28 · 4703084
Regular Safety and Health Inspection · 2.8 on-site hours
inspection2025-07-10F00A454
Plant #81 · 4703467
Special Emphasis Programs · 0.8 on-site hours
violation2025-07-108736175
Plant #28 · 4703084
56.12018 · $151.00 proposed
inspection2025-07-09F006985
Plant 82 · 4703639
Regular Safety and Health Inspection · 2.3 on-site hours
inspection2025-07-07F006982
Plant #86 · 4703452
Regular Safety and Health Inspection · 2.3 on-site hours
inspection2025-05-28F016D30
Plant 84 · 4703641
Regular Safety and Health Inspection · 3.0 on-site hours
accident2025-04-10220251070001
Plant #44 · 4701730
SLIP OR FALL OF PERSON · DYS AWY FRM WRK & RESTRCTD ACT
Accident narrative
Operator fell down a flight of steps and broke left arm.
inspection2025-04-02F0176F5
PLANT 83 · 4703640
Spot Inspection · 4.0 on-site hours
inspection2025-04-01F011EAF
Plant #61 · 4703235
Regular Safety and Health Inspection · 8.0 on-site hours
violation2025-04-019699161
Plant #61 · 4703235
56.4200(b)(2) · $151.00 proposed
violation2025-04-019699160
Plant #61 · 4703235
56.14209(b) · $151.00 proposed
violation2025-04-019699526
Plant #66 · 4703274
46.9(a) · $151.00 proposed
violation2025-04-019699525
Plant #66 · 4703274
56.4402 · $151.00 proposed
violation2025-04-019699524
Plant #66 · 4703274
56.14209(b) · $151.00 proposed
violation2025-04-019699523
Plant #66 · 4703274
56.14107(a) · $151.00 proposed
violation2025-04-019699522
Plant #66 · 4703274
56.14112(b) · S&S · $642.00 proposed
inspection2025-03-31F0176F3
Plant #66 · 4703274
Regular Safety and Health Inspection · 16.8 on-site hours

Safety sources and definitions

MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-18.

Counts describe published rows, including contractor records; accident records are not distinct incidents or numbers of people injured.

Zero means no matching records in the imported sources, not proof of no events. Historical coverage differs by source; absence before a source begins reporting is not a zero incident rate. Invalid or absent dates and records after the snapshot are excluded.

S&S means SIG_SUB=Y. Fatality records use DEGREE_INJURY_CD=01. Proposed penalties are not final assessed or paid amounts; missing dollar values are omitted.

Inspection hours are SUM_TOTAL_ON_SITE_HOURS attributed to the inspection start date, without supervisor/trainee hours. Missing hours are omitted; a started inspection may still be open.

Portfolio totals use current mine membership, including events before the current owner or operator's tenure.

CFR headings link to the current Title 30 index; they are not historical legal determinations.

SELECTED PORTFOLIO

1 linked controller.

Relationships reflect the selected mine status and current MSHA controller/operator fields.