TABLE 35 —Mechanical loading underground in bituminous coal and lignite
mines in the United States in 1940 by States
Total production at mines using mechanical
loading devices (net tons)
[Includes all soft-coal mines that produced any part of their tonnage with
the aid of mechanical loading devices In 19401

a e
Number of mines
  Using- -  both sing Using loadingon mg con- ma- Total


hi ~ veyors chines C fl~ only 2 and
Ofl ~ con- veyors
Number of machines




Production mechanically loaded






h


1 ~ 1 e


~ I


ma
c iflCS
Scrap-
ers
Conveyors
equipped
with
duckbills
and other
self-load-
ing de-
vices
Pit-car
loaders
an oa e con-
~
ors
Loaded by
machines
I
ban n~ y ~ 2 ey
Total
Mines us-
ing loading
machines
only i
Mines using conveyors only 2

Mines us
ing both
loading
machines
and con
veyors
16
2
23
49

42


5
2

2
20

6

10
12
4
89
10
Alabania.          
Arkansas
Colorado
Illinois            
Indiana
Iowa
Kentucky         
Maryland         
Michigan
Montana (bituminous coal)        
New Mexico       North Dakota (lignite)
Ohio
Oklahoma-         
Pennsylvania.
Tennessee         
Utah
Virginia
Washington        
West Virginia      
Wyoming          
U ndistributed:
East of Mississippi River
SVest of Mississippi River          
17
29
22
5
8
3
26





13
11
50
14
6
4
7
93
3
9

4
11
4

9


2
1


3

18
3

2

46
12
42
31
49
65
31
4
7~
2
36
12
132
18
16
18
11
228
25
25

20
519
130

101


48
8

3
109

296
2
31
33

363
31
46
12







13


2
2
25



7
7
9

113

6

91




2


1
49

46
6
16
5
8
98
206
38

1
209
27

48


6




236



91
41
236
80
95
26
15
11
119
22





55
28
567
51
41
53
75
734
49
1,603,194
(4)
1,868,794
28, 156,030
7,176,040
(4)
5,494, 346
(4)
(4)
(4)
7,750,819
(4)
18,031,402
93,601
2,519,675
1,996,634
62,000
30,878,128
4,799,234
2,148,938
Total
4,146,343 4, 136,397 12,699,879 ~,
    (4)    945,881 ~,
806,032 517,548 3,785,756 ~-' 
378,424 7,739,406 30,578,507 112
118,045 837,248 7, 430,945
 (4) 322, 102 ~1 7,560,746 3,031,280 19,984, 414 t!l
(4) (4) ;~~-
(4) (4)
 (4) 1,519,661
 (4) (4)
(4)
 920,610   605,071 12,154,220
 (4)  429 544 eo
 15,793,581 6,912,560 56,992, 129 ~
 1, 758, 163      (4) 2,460,835
 588,789  3,214,285
 (4)      (4) 5,831,090
 767, 610  1,089,046
 23,507,697 16,016,364 75,055,494
 150,505 2,776,369 5,444,419
 fl,840,897 1 667,268
 p1,051,473 ~
(1, 536,685 J L 775,657
3,401,717
(4)
683,932
1,364,457
230,880
(4)
1,656,208
(4)
(4)
(4)
(4)
493,023
(4)
9,203,654
622,215
353,285
1, 111, 788
733,494
13, 100,403
571,885
388,831
1,375,645
5,004,911
945,052
2,552,726
29,520,487
7,41)6,920
132,947
7, 150,554
(4)
(4)
1, 511, 123
(4)
(4)
8,243,842
422,692
27,235,056
715,816
2,872,960
3, 108,422
795,494
43,978,531
5,371, 119
388,831

512,769
4,417, 139
(4)
2,462,176
22,460,677
6,475,652
(4)
9,392,388



(4)
(4)


(4)
10,628,539
(4)
34,285,988
(4)
2,625,496
4,317,934
321,436
35,531,433
2,517, 545



2,446,886