EFFECTIVENESS OF METAL PROPS IN USSR COAL MINES

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00809A000700190197-2
• Release Decision: RIPPUB
• Original Classification: U
• Document Page Count: 4
• Document Creation Date: December 22, 2016
• Document Release Date: August 24, 2011
• Sequence Number: 197
• Publication Date: July 14, 1954
• Content Type: REPORT

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STAT
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EFFFCTIVEI~SB OF METAL PROPS IN USSR COAL MINES
Ueoi', No 1
Moscow, Jan 1954
G. A. Sosnov, Ya. M. Prudkin
The dip was etuttcau on ian in ustrial scale in 947,tafter athe SGK-2 e metal proplwast
designed.
The increase in the number of faces converted-to metal props in recent
years is characterized-by date, in the following table:
Ninen Number of Faces for Beginning of Year
1948 1
4
9
9 1950 1951 1952 L Oct 1 53 istry MinIst dofgCoal Industry 25 165 377 498 525
586
D
onbass 19 126 289 368 382 459
K
araganda 4 17 48 46 48 52
At
the end of the third quarter 1953, according to data in the above table
586 mines in the coal indu4t
,
ry had been converted to metal props, or about 25
percent of faces [in sli
htl
d
g
y
ipping seams] and, in the Donbass, 459 faces
about 35 percent of the t
t
l
, or
o
a
number of faces in slightly dipping seams.
Metal props were used most extensively at mine faces in the Donbass-(more
than 78 percent of all faces with metal props); the Karaganda basin accounted
for 10 percent and the Molotovugol', Chelvabinskugol', and Voetsibugol' com-
bines, 12 percent.
For a clarification of the effectiveness of the use of metal props at ex-
traction faces in the Donbass, 19 mines were selected, in these 80 percent of
all working faces had been converted to this type of propping, and of these,
all faces had been converted in ten mines. Data are given in the following
table:
Aveiage No of Faces
Daily No
out ut Percent of Faces
p With
Metal Progs in Use Supplied With
No of of Mine
Metal Total Units per Metal
Combines Mine
s tons Total Props (1,000) Face Props
Stalinugol' 11 900 43 36 27.7 770 83.7
Voroshilov-
gradugoi' 8 810 40 29 16.6 573 74.5 [sicJ
T
otal 19 86o 83 65 44.3 68o 79.5 [sic]
These mines used 44,300 metal props, or about 28 percent of the entire
number in use in the Donbas
c. Of the 65 faces converted to metal props
control was carried out b
roof
ti
,
y par
al backfilling with rubble strips at 43 fa
(66 percent) and b
c
i
y
av
ces
ng at 22 faces (34 percent).
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STAT
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r
STAT
in these mines. The consumptionrofstimbrought ber about a
drop timbers
3 per-
26.9 to 15.8 cubic meters per thousand tons of coal extracted, or 41. one
cent. At 18 minen, the consmnption of mine timbers decreased, and at
mine, it remained witl:out change.
Consumption of timbers per 1,000
tons extracted at the face
(cubic meters)
Cost of propping, roof control, and
timber delivery per ton of
With Wooden With Metal
Props Props Percent
-0.~) 15.8
58.7
ex
traction from face. -
(rubles) 9.40
7.7 82.0
Including
Material for props
Including
Delivery of mate,-t,i
1'>U 1.16 77.5
2.55 2.23 87.5
L
abor per 100 tons of daily
extraction (man/,hip,)
Including
Timber deliver
y
3.48 1.70 48.8
Th
e costs of materials for propping decreased from 4.25 to 3.62 rubles
ton of extraction or 15
er
erce
t
p
p
n
. The costs of materials decreased in 13 mines
and increased in six.
The costs of wages for delivery cf materials per ton of extraction dropped
from 1.1 to 0.69 ruble
or 37
,
percent. At the same time, the laboriousness of
this process per 100 tons of dail
y output decreased from 3.48 to 1.7 man/shifts
or became less than half its f
,
ormer figure. Out of 19 mines, wages for delivery
ofmaterials were decreased in 18.
The chief element determining the effectiveness of the use of metal props
at extraction faces is the decrease in the consumption of mine timbers. As al-
ready has been indicated, consumption of timbers at extraction faces decreased
from 26.9 to 15.8 cubic meters, or 11.1 cubic meters on the average per thou-
sand tons of extraction, for 19 mines. This was achieved under the following
conditions: Of 83 faces, 65 were converted to metal props, somewhat more than
75 percent, and these faces were 79.5 percent supplied with metal props. If all
the faces should be converted to metal props and completely equipped with them,
then the consumption of mine timbers per 1,000 tons of extraction would be de-
creased 16.7 cubic meters instead of 11.1 cubic meters; compared with the per-
iod of wooden props, the decrease would amount to more than 60 percent.
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Since the amount of the consumption of mine timbers varies for specific
mines, ranging from 15 to 45 cubic meters per 1,000 tons of extraction, esti-
mates on a decrease in their consumption are more correct if not based on ab-
solute data but rather on the percent of decrease in the consumption of tim-
bers as compared with the period of wooden propping. It is possible to see
the dependence of the consumption of mine timbers on the degree to which the
faces are equipped with metal props from the example of specific mines. The
saving of mine timbers in the Mine imeni XVII gaits "yezd was 30 percent,
where all the faces had metal props but were only 62.3 percent equipped with
them; in other mines, where all faces were also propped and almost completely
equipped with metal props, as, for example, Mine No 17-bis (94.5 percent),
Mine No 3-bis (95 percent), Mine No 27 (95.5 percent), and Mine No 6 Krasnaya
Zvezda (94.9 percent), the saving was 45-55 percent. 6n the other hand, in
mines poorly supplied with metal props, such as Mine No 1=bis (27.1 percent)
and Mine No 4-3-bis (59.8 percent), or in mines where not all faces were con-
vegted to metal props, the saving was only 5-15 percent.
The complete list of the 19 mines which were investigated in the procure-
ment of the above data is as follows: from the Stalinugol' Combine -- Mine
No 29 imeni Stalin, Novo Mushketovo, No 6 Krasnaya Zvezda, No 3 Butovka,
Novu Mospino, No 3-bis, No 17-bis, No 20-20-bis, imeni XVII Parts "yezd, No 15
Osnovnaya, No 27; from the Voroshilovgradugol' Combine -- Churilino-Zapadnaya,
No 1-bis, No 4-3_bis, No 3-5 Sokologorovka, No 5-5-bis, No 12-bis, No 4, and
No 9 imeni Lenin.
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