Mining Incidents

Bonanza #12 Shaft: 12 reportable incidents Metal/Non-Metal

Controlled by Gordon S Ziegler Jr
Uintah County, UT  ·  Abandoned
MSHA Mine ID: 4201716

MSHA record for Bonanza #12 Shaft (mine ID 4201716). Fatalities, non-fatal incidents grouped by year, current operator and controller, and mine context.

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Fatalities
0
Total incidents
12
Years on record
1983–1989
Latest incident
Oct 1989
Ownership history
  1. Ziegler Chemical & Mineral Corp 1981 to present
Source: MSHA controller and operator history, updated weekly.

Bonanza #12 Shaft sits in Uintah County, Utah, where the Census mining category is 12.5% of county employment.

Local economic context
County figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.
Uintah County, Utah · Population 36,458
12.5%
Mining share of county employment
$69,861
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
No fatalities recorded at this mine.

Reportable incidents

12 on file

1989 · 1 incident

October 16, 1989 UT · Metal/Non-Metal continuous miner operator, coal mole operator SLIP OR FALL OF PERSON
Ziegler Chemical & Mineral Corp · Fall onto or against objects

WHILE MINING HIS FOOT SLIPPED ON THE FLOOR CAUSING HIM TO FALL INTO THE WALL INJURING HIS RIGHT SHOULDER.

1988 · 4 incidents

1987 · 1 incident

1985 · 3 incidents

1984 · 2 incidents

September 26, 1984 UT · Metal/Non-Metal hoistman, hoist operator OTHER
Ziegler Chemical & Mineral Corp · Bodily reaction, (Not Elsewhere Classified)

WHILE WALKING HIS LEFT KNEE POPPED OUT

July 26, 1984 UT · Metal/Non-Metal ledgeman/hand, quarry man MACHINERY
Ziegler Chemical & Mineral Corp · Struck by... (Not Elsewhere Classified)

WHILE MINING THE MOIL POINT OF THE CHIPPING HAMMER SLIPPED AND PENETRATED HIS LEFT HAND

1983 · 1 incident