BITUMINOUS COAL AND LIGNITE
865

TABLE 42.—Method of mining at bituminous coal mines in the United States
served
by cleaning plants, 1938_401
[Does not include any estimate for mines that may ship to consumer-operated
plants]
*
.
.
Method of mining in use
Total production from mines that move coal to cleaning plants (net fr~n~)2


,~ 1
crease, over Net tons


1938
1939
1940


Mined from strip pits                  
Mechanically loaded underground        
Hand-loaded underground              

Total                         
15,213,564
37, 195,439
35,828,538
17,960,049
53,495,851
61,805,096
20,029,770
66,148,465
75,493,332
2,069,721
12,652,614
13,688,236
11.5
23.7
22.1

108,237,541
133,260,996
161,671,567
28,410,571
213
' Excludes Alaska.
2 Based upon shipping weights and includes somemarketable coal that did not
pass through cleaning plants.

TABLE 43.—Result of operations at bituminous coal cleaning plants in
the United
States in 1939, by States, in net tons 1
.
~
State
~
Tptal raw

tocleaning
plants'
Coal ob-
~

process.
.
Refuse re~fn~'

process'
~
*

*

r~J
a co
Total
~
' ~~F
cleaning plants4
Alabama                        
Colorado                           
Illinois                            
Ipdiana :Kansas                          ~entucky .Missouri             
           Ohio                            Pennsylvania6                
     Tennessee                        Virginia                          Washington
                     West Virginia7                   
Other States S                    

Total at mines only'             
Consumer plants'°                   

Grand total                  
11,318,668
(6)
16, 408,336
4,405,407
14400,011.
2,275,575
1,315, 185
3,323,255
(5)
 352,918
1,399,522
1,549,408
20,766,527
- 17, 161,041
9,938,993
(5)
14,108,576
3,589, ha
1,138,039
2,116,523
1,054,664
2,800,280
(6)
 320,206
1,272, 296
1,366,754
18,812,410
16,058,171
1,379,675
(6)
2,299,760
 816,234
261,972
 159,052
 260, 521
 522,975
(5)
 n2,712
 127,226
 182,654
1,954, 117
1,102,870
12.2
9.2
14.0
18.5
18.7
7.0
19.8
15.7
6. 5
9.3
9.1
11.8
9.4
 ~---
10,911, 118
(5)
28,194.800
6,910, 114
1,328,866
4,384,939
1,904,759
3,231,827
(5)
1,098,871
4,514,378
1,548,729
42,445,104
26,787,491

81,675,853
7,140,590

88,816,443
72,576,085
6,800,587

79,376,672
9,099,768
 340,003

9,439,771
11.1

4.8

10.6
133,260,996


-—   
' Excludes Alaska.
 ' Exact figures on raw coalor refuse could not be furnished by many operators;
in such instances, estimates were made from all available information at
hand.
 S In Alabama (for example) for every 100 tons of raw coal cleaned in 1939,
an average of 12.2 tons of refuse was discarded and 87.8 tons of clean marketable
coal was obtained.
 4Based upon shipping weights; includes some marketable coal that did not
pass through cleaning plants.
 ' Included under "Other States."
 ' Includes some coal mined In Pennsylvania and cleaned In Ohio.
 ' Includes some coal mined In West Virginia and cleaned in Ohio.
 ' Includes Arkansas, Colorado, Maryland, Michigan, Montana, New Mexico,
Pennsylvania, Texas, and Utah.
 ' Includes all mechanical cleaning other than washerlea operated by consumer
steel companies.
 ' S Includes central washerles in Colorado and Pennsylvania operated by
consumer steel companies.