Categories of work
|
Obs
|
SMR
|
Obs
|
SMR
|
Obs
|
SMR
|
Obs
|
SMR
|
|
Pedersen
et al
. (1973)
|
Roasting-smelting
|
5
|
5000
|
4
|
1000
|
12
|
480
|
21
|
700
|
Electrolysis
|
6
|
3000
|
-
|
-
|
26
|
720
|
32
|
744
|
Other specified processes
|
1
|
1000
|
1
|
500
|
6
|
460
|
8
|
500
|
Administration, service and unspecified
|
2
|
2000
|
-
|
-
|
4
|
150
|
6
|
194
|
Total
|
14
|
2800
|
5
|
360
|
48
|
475
|
67
|
558
|
|
Magnus
et al
. (1982)
|
Roasting-smelting
|
8
|
4000
|
4
|
670
|
19
|
360
|
31
|
510
|
Electrolysis
|
8
|
2670
|
0
|
0
|
40
|
550
|
48
|
570
|
Other specified processes
|
2
|
2000
|
1
|
330
|
12
|
390
|
15
|
430
|
Administration, service and unspecified
|
3
|
1500
|
0
|
0
|
11
|
175
|
14
|
190
|
Total
|
21
|
2630
|
5
|
210
|
82
|
370
|
108
|
430
|