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United States. Office of Indian Affairs / Annual report of the Commissioner of Indian Affairs, for the year 1905, Part I

Report of mine inspector for Indian territory,   pp. 641-704 PDF (25.9 MB)

Page 700

SHOT NO. 2. 
This shot was in the face of a room 25 feet up from the entry. The hole was
"gripping" and was 6 feet deep with 2 feet 6 inches of coal on
the heel and 
5 feet 2 inches on the point of hole. The charge was 2 feet 1 inch of white
powder, well tamped with dirt dummies. We retired to a point on entry 70
feet from shot and experienced the same results as from shot No. 1. We 
examined the shot within one and one-half minutes after ignition and found
inconvenience from smoke. The execution of this shot was good, making good
coal and not shattering it to slack or throwing it forcibly from the face.
shot was somewhat overpowdered and I believe that 20 inches of powder would
have done the work as well. 'The heel was blown off the shot, but not scat-
tered over the room, as in all probability it would have been from black
But the coal that was blown out and the coal that was scattered was in fine
condition for the production of lump coal, the percentage of slack being
small. It was the opinion of all that this shot would have taken at least
feet of black powder. 
SHOT NO. 3. 
This shot was in the face of the entry and was a 7-foot hole drilled straight
into the face 18 inches from the upper rib and parallel to it. The cartridge
contained 2 feet 6 inches of white powder and was solidly tamped with 
dummies. We retired to a point 85 feet from shot and felt no amount of vibra-
tion from the air. The coal broke out in a V shape 4 feet wide in front and
4 feet from front of hole to point of V. The coal left standing was cracked
and could be readily worked off. Had the shot been tamped with black powder
it would have been, beyond doubt, one of the most dangerous shots that could
have been fired, and it is doubtful if enough powder could have been placed
the hole to have done the same execution. The coal that was blown out in
V shape was in nice large pieces, the percentage of slack being very low.
This was a remarkable test of the efficiency of this powder, and I am of
opinion that when this powder is better understood its efficiency, safety,
superiority over black powder in all regards can not be sufficiently appreciated.
United States Mine Inspector for the Indian Territorji. 
I am informed that this powder is composed of varying proportions 
of potassium chlorate (KC1O3) and granulated or white sugar, the 
same being brought to a jelly or candied condition, and the potassium 
chlorate then intimately mixed with it, the whole being rolled, when 
dry, to a powder of various sized granules at the will or pleasure of 
the party making it. I am advised that this powder costs two or 
three times as much as the ordinary black powder, but it is claimed 
that it will do two or three times as much work and with increased 
No one, however, has appeared who is willing to test this powder 
to a sufficient extent and manufacture it on a sufficient scale, and its
use has been energetically discouraged by the manufacturers of ex- 
plosives, notwithstanding the practicability of its use has been, to 
my mind, thoroughly demonstrated. 
Following will be found tables showing the details of causes of 
accidents and other matters usually so classified: 
Statement of all accidents occurring in mines during the year ended June
1905, by causes. 
Fall of roof-------------------18    Coal falling down shaft2---------------2
P it  car -...........            28  Coal  falling  dow n  tipple _-------------
Gas explosion-                    23  Wilburton explosion, cause unknown--
Hoisting rope -----------------------2 Explosion of powder,-----------------4
Fall of coal                      3 
Shot firing               -       17       Total---------------114 

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