Chapter GQ

COAL QUALITY AND GEOCHEMISTRY, GREATER

GREEN RIVER BASIN, WYOMING

By G.D. Stricker and M.S. Ellis

in U.S. Geological Survey Professional Paper 1625-A
GQ-ii

Contents

Coal Quality and Geochemistry, Greater Green River Basin, Wyoming..........GQ-1

References Cited ................................................................................................GQ-5

Figures

GQ-1. Index map showing the Greater Green River Basin, Wyoming.

GQ-2. Index map showing coal quality data distribution in the Deadman coal

zone, Jim Bridger area of the Point of Rocks-Black Butte coalfield.

GQ-3. Index map showing coal quality data distribution in the Deadman coal

zone, Black Butte area of the Point of Rocks-Black Butte coalfield.

GQ-4. Ash yield in the Jim Bridger area of the Point of Rocks-Black Butte

coalfield.

GQ-5. Ash yield in the Black Butte area of the Point of Rocks-Black Butte

coalfield.

GQ-6. Total sulfur content in the Jim Bridger area of the Point of Rocks-Black

Butte coalfield.

GQ-7. Total sulfur content in the Black Butte area of the Point of Rocks-Black

Butte coalfield.

GQ-8. Moist, mineral-matter-free Btu/lb in the Jim Bridger area of the Point of

Rocks-Black Butte coalfield.

GQ-9. Moist, mineral-matter-free Btu/lb in the Black Butte area of the Point of

Rocks-Black Butte coalfield.
GQ-iii

Figures-continued

GQ-10. Pounds of sulfur dioxide per million Btu (lbSO2 ) in the Jim Bridger area

of the Black Butte area, Point of Rocks-Black Butte coalfield.

GQ-11. Pounds of sulfur dioxide per million Btu (lbSO2 ) in the Black Butte area

of the Point of Rocks-Black Butte coalfield.

GQ-12. Antimony concentration in the Jim Bridger area of the Point of RocksBlack Butte coalfield.

GQ-13. Arsenic concentration in the Jim Bridger area of the Point of Rocks-Black

Butte coalfield.

GQ-14. Beryllium concentration in the Jim Bridger area of the Point of RocksBlack Butte coalfield.

GQ-15. Cadmium concentration in the Jim Bridger area of the Point of RocksBlack Butte coalfield.

GQ-16. Chromium concentration in the Jim Bridger area of the Point of RocksBlack Butte coalfield.

GQ-17. Cobalt concentration in the Jim Bridger area of the Point of Rocks-Black

Butte coalfield.

GQ-18. Lead concentration in the Jim Bridger area of the Point of Rocks-Black

Butte coalfield.

GQ-19. Manganese concentration in the Jim Bridger area of the Point of RocksBlack Butte coalfield.

GQ-20. Mercury concentration in the Jim Bridger area of the Point of RocksBlack Butte coalfield.

GQ-21. Nickel concentration in the Jim Bridger area of the Point of Rocks-Black

Butte coalfield.
GQ-iv

Figures-continued

GQ-22. Selenium concentration in the Jim Bridger area of the Point of RocksBlack Butte coalfield.

GQ-23. Uranium concentration in the Jim Bridger area of the Point of RocksBlack Butte coalfield.

GQ-24. Antimony concentration in the Black Butte area of the Point of RocksBlack Butte coalfield.

GQ-25. Arsenic concentration in the Black Butte area of the Point of Rocks-Black

Butte coalfield.

GQ-26. Beryllium concentration in the Black Butte area of the Point of RocksBlack Butte coalfield.

GQ-27. Cadmium concentration in the Black Butte area of the Point of RocksBlack Butte coalfield.

GQ-28. Chromium concentration in the Black Butte area of the Point of RocksBlack Butte coalfield.

GQ-29. Cobalt concentration in the Black Butte area of the Point of Rocks-Black

Butte coalfield.

GQ-30. Lead concentration in the Black Butte area of the Point of Rocks-Black

Butte coalfield.

GQ-31. Manganese concentration in the Black Butte area of the Point of RocksBlack Butte coalfield.

GQ-32. Mercury concentration in the Black Butte area of the Point of RocksBlack Butte coalfield.
GQ-v

Figures-continued

GQ-33. Nickel concentration in the Black Butte area of the Point of Rocks-Black

Butte coalfield.

GQ-34. Selenium concentration in the Black Butte area of the Point of RocksBlack Butte coalfield.

GQ-35. Uranium concentration in the Black Butte area of the Point of RocksBlack Butte coalfield.

Tables

GQ-1. Summary data for Deadman coal zone in the Point of Rocks-Black Butte

coalfield, Greater Green River Basin, Wyoming

GQ-2. Summary data for Deadman coal zone in the Jim Bridger area of the Point

of Rocks-Black Butte coalfield

GQ-3. Summary data for Deadman coal zone in the Black Butte area of the Point

of Rocks-Black Butte coalfield
GQ-1

COAL QUALITY AND GEOCHEMISTRY, GREATER GREEN

RIVER BASIN, WYOMING

Actively mined coal in the Greater Green River Basin, Wyoming (fig. GQ-1) is

considered to be a “clean coal.” The coal is a low-contaminant subbituminous coal

resource. The Greater Green River Basin has one coalfield, the Point of RocksBlack Butte, consisting of two study areas: (1) The Jim Bridger area, located in the

north half of the coalfield, and (2) The Point of Rocks-Black Butte area, located in the

south half of the coalfield. There is one assessment unit in the Greater Green River

Basin, the Deadman coal zone, which is composed of coal beds 1 through 5 and

A through C. For the location and description of coalfield and coal zone, 

see Chapter GF-Framework Geology of Fort Union Coal in the Eastern Rock

Springs Uplift, Greater Green River Basin. This coal zone has the following

arithmetic mean values (on an as-received basis) for coal that is not presently being

mined or under lease to be mined in the future: moisture–19.95 percent, ash

yield–11.18 percent, total sulfur–0.56 percent, calorific value–9,000 Btu/lb,

pounds of SO2 per million Btu–1.27, and moist, mineral-matter-free

Btu–10,270. Arithmetic mean concentration (in parts per million and on wholecoal and remnant-moisture basis) of elements of environmental concern for the

Deadman coal zone are: antimony–0.97, arsenic–21, beryllium–0.69,

cadmium–0.28, chromium–13, cobalt–2.8, lead–5.5, manganese–23,

mercury–0.20, nickel–9.7, selenium–2.8, and uranium–5.1. Coal from the

Greater Green River Basin is developed from 2 mines and utilized for electric

power generation. Table GQ-1 is a summary of coal quality in the Point of Rocks-
GQ-2

Black Butte coalfield, while tables GQ-2 and GQ-3 summarize the coal quality of

the Jim Bridger and Black Butte areas separately.

Summary data for the 18 variables mentioned in the previous paragraph were

calculated for the Deadman coal zone. However, much of the coal quality data in

this basin are proprietary. This data, along with public data, is used in the

summary tables but is not shown on location maps or on other illustrations. A

common problem in statistical summaries of trace-element data arises when

element values are below the limits of detection. This results in a censored

distribution. To compute unbiased estimates of censored data for the elements in

this table, we adopted the protocol of reducing all “less than” values by 50 percent

to generate a real value for these data. Summary statistics of range (minimum,

with an “L” indicating “less than”, and maximum values) and arithmetic means

were generated using the modified data. Moisture values are reported on an asreceived basis (American Society for Testing and Materials, 1994b, designation

D3180-89). Because no equilibrium moisture values are available for this report,

apparent ranks can not reliably be determined.

Between 1974 and 1994, the U.S. Geological Survey analyzed samples of coal for

major-, minor-, and trace-element contents. Prior to performing the analyses, most

of the coal samples were dried at room temperature and humidity for as much as 80

hours. Some samples, however, may have only been dried enough to allow

grinding (to less than 100 mesh). Moisture content in the samples is unknown,

although moisture contents were probably similar to that which would remain after

air-dry loss determination (American Society for Testing and Materials, 1994c,

D3302-91). Since the actual moisture content of the samples analyzed between

1974 and 1994 is unknown and can not be determined, the major-, minor-, and
GQ-3

trace-element contents is reported on a remnant moisture basis. Also, the

elemental analysis of the samples cannot be converted to any other moisture basis.

In addition, these analyses can only provide an approximation of load factors (such

as, pounds of mercury per trillion Btu).

The following graphical displays, figures GQ-2 through GQ-35, show public

data locations and values for the variables listed in tables GQ-2 and GQ-3, except

for calorific value and moisture, for the Deadman assessment unit in the Jim

Bridger and Point of Rocks-Black Butte areas. The locations of public data points

used in this summary are shown on figures GQ-2 and GQ-3. When more than one

analysis was available per location, the analytical values were weight averaged on

coal sample thickness. For ash yield (figs. GQ-4 and GQ-5) and total sulfur

content (figs. GQ-6 and GQ-7), the values are color coded to low, medium, and

high, following guidelines established in U.S. Geological Survey Circular 891

(Wood and others, 1983). For moist, mineral-matter-free Btu, which is used in

conjunction with other factors to determine apparent rank (figs. GQ-8 and GQ-9),

we utilized the apparent rank designations established by American Society for

Testing and Materials, (1994a), designation D388-92a. For pounds of sulfur

dioxide per million Btu (lbSO2) (figs. GQ-10 and GQ-11), values are color coded

according to the U.S. Environmental Protection Agency’s Phase I, Phase II, and

non-compliant limits for sulfur emission from coal-fired power plants (U.S.

Environmental Protection Agency, 1996).

No guidelines have been established for the elements of environmental concern

(also referred to as “hazardous air pollutants” or “HAPs”). Analytical values for

these elements (figs. GQ-12 through GQ-35) are color coded based on the

following parameters: (1) each element of environmental concern was ranked from
GQ-4

the lowest to highest value for all data in the Northern Rocky Mountains and Great

Plains region and (2) quartiles were established for each element such that low

represents those values that are less than the .25 quartile (also known as the lower

quartile or the 25th percentile), medium represents those values that are within the

.25 to .75 quartiles (two quartiles representing 50 percent of the values or between

the 25th to 75th percentile), and high represents those values that are in the upper

.25 quartile (or greater than the 75th percentile).
GQ-5

REFERENCES CITED

American Society for Testing and Materials, 1994a, Annual book of ASTM

Standards, Section 5, Petroleum products, lubricants and fossil fuels, vol.

05.05 Gaseous fuels; coal and coke; section D388-92a; Standard

Classification of Coal by Rank: American Society for Testing and Materials,

Philadelphia, Pennsylvania, p. 168-171.

 1994b, Annual book of ASTM Standards, Section 5, Petroleum products,

lubricants and fossil fuels, vol. 05.05 Gaseous fuels; coal and coke; section

D3180-89; Standard Practice for Calculating Coal and Coke Analysis from

As-Determined to Different Bases: American Society for Testing and

Materials, Philadelphia, Pennsylvania, p. 318-320.

 1994c, Annual book of ASTM Standards, Section 5, Petroleum products,

lubricants and fossil fuels, vol. 05.05 Gaseous fuels; coal and coke; section

D3302-91; Standard Test Method for Total Moisture in Coal: American

Society for Testing and Materials, Philadelphia, Pennsylvania, p. 330-336.

Bragg, L.J., Oman, J.K., Tewalt, S.J., Oman, C.L., Rega, N.H., Washington, P.M.,

and Finkleman, R.B, 1994, U.S. Geological Survey Coal Quality (Coalqual)

Database: Version 1.3: U.S. Geological Survey Open-File Report 94-205,

CD-ROM.

U.S. Environmental Protection Agency, 1996, Standards of Performance for New

Stationary Sources, 40CFR, Part 60.43, Standards for Sulfur Dioxide:

Environmental Protection Agency, 27 p.
GQ-6

Wood, G.H., Jr., Kehn, T.M., Carter, M.D., and Culbertson, W.C., 1983, Coal

resource classification system of the U.S. Geological Survey: U.S.

Geological Survey Circular 891, 65 p.

N

Data point location

Jim Bridger

Area

Study 

Limit

Idaho

Utah

Wyoming

Colorado

Greater Green River Basin (Part)

0 3 6 Miles

Figure GQ-2. Index map showing coal quality data distribution in the Deadman 

coal zone, Jim Bridger area of the Point of Rocks-Black Butte coalfield, Greater 

Green River Basin, Wyoming.
N

Black Butte

Area 

Study

Limit

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-3. Index map showing coal quality data distribution in the Deadman 

coal zone, Black Butte area of the Point of Rocks-Black Butte coalfield, 

Greater Green River Basin, Wyoming.

Greater Green River Basin (Part)

Data point location
Greater Green River Basin (Part)

N

Low

Medium 

High

( < 8 % )

( 8 - 15 % )

( > 15 % )

Jim Bridger

Area 

Study 

Limit

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-4. Ash yield in the Jim Bridger area of the Point of Rocks-Black 

Butte coalfield, Greater Green River Basin, Wyoming.
N

Black Butte

Area

Study 

Limit

Greater Green River Basin (Part)

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-5. Ash yield in the Black Butte area of the Point of Rocks-Black Butte

coalfield, Greater Green River Basin, Wyoming.

Low

Medium 

High

( < 8 % )

( 8 - 15 % )

( > 15 % )
N

Low

Medium 

High

( < 1 % )

( 1 - 3 % )

( > 3 % )

Jim Bridger

Area

Study

Limit

Idaho

Utah

Wyoming

Colorado

Greater Green River Basin (Part)

0 3 6 Miles

Figure GQ-6. Total sulfur content in the Jim Bridger area of the Point of 

Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Low

Medium 

High

( < 1 % )

( 1 - 3 % )

( > 3 % )

N

Black Butte

Area

Study 

Limit

Greater Green River Basin (Part)

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-7. Total sulfur content in the Black Butte area of the Point of Rocks-Black 

Butte coalfield, Greater Green River Basin, Wyoming.
N

Greater Green River Basin (Part)

Lignite	 	

Subbituminous 

Bituminous

( < 8,300 )

( 8,300 - 10,500 )

( > 10,500 )

Utah

Wyoming

Colorado

Idaho

Jim Bridger

Area

Study 

Limit

0 3 6 Miles

Figure GQ-8. Moist, mineral-matter-free Btu/lb in the Jim Bridger area of the 

Point of Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Lignite

Subbituminous 

Bituminous

( < 8,300 )

( 8,300 - 10,500 )

( > 10,500 )

N

Black Butte

Area

Study

Limit

Greater Green River Basin (Part)

Utah

Wyoming

Colorado

Idaho

0 3 6 Miles

Figure GQ-9. Moist, mineral-matter-free Btu/lb in the Black Butte area of the 

Point of Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
N

Low

Medium 

High

( < 1.2 lbs)

( 1.2 - 2.4 lbs)

( > 2.4 lbs)

Jim Bridger

Area

Study

Limit

Idaho

Utah

Wyoming

Colorado

Greater Green River Basin (Part)

0 3 6 Miles

Figure GQ-10. Pounds of sulfur dioxide per million Btu in the Jim Bridger area 

of the Point of Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Low

Medium 

High

( < 1.2 lbs)

( 1.2 - 2.4 lbs)

( > 2.4 lbs)

N

Black Butte

Area

Study 

Limit

Greater Green River Basin (Part)

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-11. Pounds of sulfur dioxide per million Btu in the Black Butte area of the 

Point of Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Greater Green River Basin (Part)

N

Low

Medium 

High

( < 0.2 ppm )

( 0.2 - 0.5 ppm )

( > 0.5 ppm )

Jim Bridger

Area

Study

Limit

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-12. Antimony concentration in the Jim Bridger area of the 

Point of Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
N

Low

Medium 

High

( < 1.4 ppm )

( 1.4 - 6.1 ppm )

( > 6.1 ppm )

JIm Bridger

Area

Study 

Limit

Idaho

Utah

Wyoming

Colorado

Greater Green River Basin (Part)

0 3 6 Miles

Figure GQ-13. Arsenic concentration in the Jim Bridger area of the Point of 

Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
N

Low

Medium 

High

( < 0.23 ppm )

( 0.23 - 0.73 ppm )

( > 0.73 ppm )

Jim Bridger

Area 

Study 

Limit

Greater Green River Basin (Part)

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-14. Beryllium concentration in the Jim Bridger area of the 

Point of RocksóBlack Butte coalfield, Greater Green River Basin, Wyoming.
N

Low

Medium 

High

( < 0.052 ppm )

( 0.052 - 0.13 ppm )

( > 0.13 ppm )

Jim Bridger

Area

Study 

Limit

Idaho

Utah

Wyoming

Colorado

Greater Green River Basin (Part)

0 3 6 Miles

Figure GQ-15. Cadmium concentration in the Jim Bridger area of the 

Point of Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
N

Low

Medium 

High

( < 3.0 ppm )

( 3.0 - 8.2 ppm )

( > 8.2 ppm )

Jim Bridger

Area 

Study 

Limit

Idaho

Utah

Wyoming

Colorado

Greater Green River Basin (Part)

0 3 6 Miles

Figure GQ-16. Chromium concentration in the Jim Bridger area of the 

Point of Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Greater Green River Basin (Part)

N

Low

Medium 

High

( < 0.87 ppm )

( 0.87 - 1.9 ppm )

( > 1.9 ppm )

Jim Bridger

Area 

Study

Limit

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-17. Cobalt concentration in the Jim Bridger area of the 

Point of Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
N

Low

Medium 

High

( < 1.8 ppm )

( 1.8 - 4.2 ppm )

( > 4.2 ppm )

Jim Bridger

Area

Study 

Limit

Greater Green River Basin (Part)

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-18. Lead concentration in the Jim Bridger area of the 

Point of Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
N

Low

Medium 

High

( < 12 ppm )

( 12 - 49 ppm )

( > 49 ppm )

Jim Bridger

Area 

Study 

Limit

Greater Green River Basin (Part)

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-19. Manganese concentration in the Jim Bridger area of the

Point of Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
N

Low

Medium 

High

( < 0.06 ppm )

( 0.06 - 0.13 ppm )

( > 0.13 ppm )

Jim Bridger

Area

Study 

Limit

Idaho

Utah

Wyoming

Colorado

Greater Green River Basin (Part)

0 3 6 Miles

Figure GQ-20. Mercury concentration in the Jim Bridger area of the 

Point of Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
N

Low

Medium 

High

( < 1.9 ppm )

( 1.9 - 5.2 ppm )

( > 5.2 ppm )

Jim Bridger

Area

Study

Limit

Greater Green River Basin (Part)

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-21. Nickel concentration in the Jim Bridger area of the 

Point of Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
N

Low

Medium 

High

( < 0.5 ppm )

( 0.5 - 1.1 ppm )

( > 1.1 ppm )

Jim Bridger

Area

Study

Limit

Idaho

Utah

Wyoming

Colorado

Greater Green River Basin (Part)

0 3 6 Miles

Figure GQ-22. Selenium concentration in the Jim Bridger area of the 

Point of Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Greater Green River Basin (Part)

N

Low

Medium 

High

( < 0.61 ppm )

( 0.61 - 1.6 ppm )

( > 1.6 ppm )

Jim Bridger

Area

Study

Limit

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-23. Uranium concentration in the Jim Bridger area of the 

Point of Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Low

Medium 

High

( < 0.2 ppm )

( 0.2 - 0.5 ppm )

( > 0.5 ppm )

N

Black Butte

Area

Study

Limit

Figure GQ-24. Antimony concentration in the Black Butte area of the Point of 

Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.

Utah

Wyoming

Colorado

Idaho

Greater Green River Basin (Part)

0 3 6 Miles
Low

Medium 

High

( < 1.4 ppm )

( 1.4 - 6.1 ppm )

( > 6.1 ppm )

N

Black Butte

Area

Study

Limit

Greater Green River Basin (Part)

Figure GQ-25. Arsenic concentration in the Black Butte area of the Point of 

Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles
Low

Medium 

High

( < 0.23 ppm )

( 0.23 - 0.73 ppm )

( > 0.73 ppm )

N

Black Butte

Area

Study 

Limit

'

Idaho

Utah

Wyoming

Colorado

Greater Green River Basin (Part)

0 3 6 Miles

Figure GQ-26. Beryllium concentration in the Black Butte area of the Point of 

Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Low

Medium 

High

( < 0.052 ppm )

( 0.052 - 0.13 ppm )

( > 0.13 ppm )

N

Black Butte

Area

Study

Limit

Greater Green River Basin (Part)

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-27. Cadmium concentration in the Black Butte area of the Point of 

Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Low

Medium 

High

( < 3.0 ppm )

( 3.0 - 8.2 ppm )

( > 8.2 ppm )

N

Black Butte

Area

Study 

Limit

Greater Green River Basin (Part)

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-28. Chromium concentration in the Black Butte area of the Point of 

Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Low

Medium 

High

( < 0.87 ppm )

( 0.87 - 1.9 ppm )

( > 1.9 ppm )

N

Black Butte

Area

Study

Limit

Greater Green River Basin (Part)

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-29. Cobalt concentration in the Black Butte area of the Point of 

Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Greater Green River Basin (Part)

Low

Medium 

High

( < 1.8 ppm )

( 1.8 - 4.2 ppm )

( > 4.2 ppm )

N

Black Butte

Area

Study

Limit

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-30. Lead concentration in the Black Butte area of the Point of 

Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Low

Medium 

High

( < 12 ppm )

( 12 - 49 ppm )

( > 49 ppm )

N

Black Butte

Area

Study 

Limit

Greater Green River Basin (Part)

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-31. Manganese concentration in the Black Butte area of the Point of 

Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Low

Medium 

High

( < 0.06 ppm )

( 0.06 - 0.13 ppm )

( > 0.13 ppm )

N

Black Butte

Area 

Study

Limit

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-32. Mercury concentration in the Black Butte area of the Point of 

Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.

Greater Green River Basin (Part)
Low

Medium 

High

( < 1.9 ppm )

( 1.9 - 5.2 ppm )

( > 5.2 ppm )

N

Black Butte

Area

Study

Limit

Greater Green River Basin (Part)

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-33. Nickel concentration in the Black Butte area of the Point of 

Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Low

Medium 

High

( < 0.5 ppm )

( 0.5 - 1.1 ppm )

( > 1.1 ppm )

N

Black Butte

Area

Study 

Limit

Greater Green River Basin (Part)

Idaho

Utah

Wyoming

Colorado

0 3 6 Miles

Figure GQ-34. Selenium concentration in the Black Butte area of the Point of 

Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Low

Medium 

High

( < 0.61 ppm )

( 0.61 - 1.6 ppm )

( > 1.6 ppm )

N

Black Butte

Area

Study

Limit

Idaho

Utah

Wyoming

Colorado

Greater Green River Basin (Part)

0 3 6 Miles

Figure GQ-35. Uranium concentration in the Black Butte area of the Point of 

Rocks-Black Butte coalfield, Greater Green River Basin, Wyoming.
Table GQ-1. Summary data for Deadman coal zone in the Point of Rocks-Black

Butte coalfield, Greater Green River Basin, Wyoming. Calculated from the

unpublished U.S. Geological Survey coal quality database (USCHEM), February,

1992; Bragg and others (1994); and proprietary source(s)

Variable Number Range Mean

of samples Minimum Maximum

Moisture 11,101 3.8 36.35 19.95

Ash 11,090 4.11 49.91 11.18

Total sulfur 11,082 0.13 2.43 0.56

Calorific value 21,090 2,400 10,510 9,000

lb SO2

3

1,082 0.31 5.71 1.27

MMMFBtu 41,082 5,200 12,000 10,270

Antimony 526 0.20 6.4 0.97

Arsenic 526 0.25L 130 21

Beryllium 5 21 0.12 2.0 0.69

Cadmium 526 0.02L 1.2 0.28

Chromium 526 2.9 55 13

Cobalt 526 0.57 12 2.8

Lead 526 0.5L 20 5.5

Manganese 526 7.0 68 23

Mercury 526 0.03 0.69 0.20

Nickel 526 1.1 39 9.7

Selenium 526 0.30 9.0 2.8

Uranium 526 0.34 75 5.1

1

 Values are in percent and on an as-received basis.

2

 Value is in British thermal units (Btu).

3

 Value is in pounds per million Btu and on an as-received basis.

4

 Value is in British thermal units on a moist, mineral-matter-free basis.

5

 Values are in parts per million (ppm) on a whole-coal and as-received basis; “L”

 denotes less than value shown.
Table GQ-2. Summary data for Deadman coal zone in the Jim Bridger area in the

Black Butte/ Point-of-Rocks coalfield, Greater Green River Basin, Wyoming.

Calculated from the unpublished U.S. Geological Survey coal quality database

(USCHEM), February, 1992; Bragg and others (1994); and proprietary source(s)

Variable Number Range Mean

of samples Minimum Maximum

Moisture 1693 11.59 32.15 19.92

Ash 1682 4.90 49.91 12.96

Total sulfur 1682 0.13 2.43 0.65

Calorific value 2682 2,400 10,510 8,740

lb SO2

3

682 0.58 5.71 1.51

MMMFBtu 4682 5,200 12,000 10,190

Antimony 514 0.20 0.90 0.43

Arsenic 514 0.25L 15 2.6

Beryllium 5 9 0.12 0.34 0.24

Cadmium 514 0.02L 0.27 0.06

Chromium 514 2.9 9.4 5.5

Cobalt 514 0.57 1.9 1.2

Lead 514 0.50L 5.6 3.3

Manganese 514 11 68 25

Mercury 514 0.03 0.69 0.15

Nickel 514 1.1 4.6 2.2

Selenium 514 0.30 3.5 1.9

Uranium 514 0.34 2.3 1.1

1

 Value is in percent and on an as-received basis.

2

 Value is in British thermal units (Btu).

3

 Value is in pounds per million Btu and on an as-received basis.

4

 Value is in British thermal units on a moist, mineral-matter-free basis.

5

 Value is in parts per million (ppm) on a whole-coal and as-received basis; “L”

 denotes less than value shown.
Table GQ-3. Summary data for Deadman coal zone in the Black Butte area of the

Point of Rocks-Black Butte coalfield , Greater Green River Basin, Wyoming.

Calculated from the unpublished U.S. Geological Survey coal quality database

(USCHEM), February, 1992; Bragg and others (1994); and proprietary source(s)

Variable Number Range Mean

of samples Minimum Maximum

Moisture 1408 3.8 36.35 20.01

Ash 1408 4.11 26.03 8.22

Total sulfur 1400 0.13 2.43 0.56

Calorific value 2408 5,220 10,450 9,440

lb SO2

3

400 0.31 5.13 0.88

MMMFBtu 4400 5,900 11,400 10,420

Antimony 512 0.30 6.4 1.6

Arsenic 512 1.0 130 44

Beryllium 5 12 0.33 2.0 1.0

Cadmium 512 0.06 1.2 0.55

Chromium 512 8.1 55 22

Cobalt 512 1.1 12 4.8

Lead 512 3.6 20 8.0

Manganese 512 7.0 44 21

Mercury 512 0.05 0.58 0.27

Nickel 512 3.3 39 18

Selenium 512 0.60 9.0 3.7

Uranium 512 0.74 75 9.8

1

 Value is in percent and on an as-received basis.

2

 Value is in British thermal units (Btu).

3

 Value is in pounds per million Btu and on an as-received basis.

4

 Value is in British thermal units on a moist, mineral-matter-free basis.

5

 Value is in parts per million (ppm) on a whole-coal and as-received basis.