Uses and advantages of short period delay blasting systems in mining and quarrying

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Falk, Irving C., “Uses and benefits of short duration put off blasting systems in mining and quarrying”
(1951). Masters Theses. 2989.
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‘QSES AlID ADVANTAGES OF SHORT PERIOD DELAY BLASTING
SYSTEMS IN MINING AND QJARRYING
By_
IRVING C. FALK
A
‘l’EESIS
Submitted to the :school o:f the
·scHOOL OF MIMES M”D r~ETALLURGY OF ‘llIE UNIVERSITY OF ~’.::ISSOUF.I
in partial :ful.Fillment o:f the paintings required :for the
Degree o:f
!!ASTER OF SCIENCE, MINING ENGI~RING
Rolla, 1’~1 ssouri
1951
ACINOWLEDGErvIBNTS
The author desires to aclmowledge the assist and recommendation
given via the starr or the Mining Engineering Department
or the Missouri Schoo1 or Mines and Metallurgy; particularly to Dr. J. D. Forrester, Mr. W. J. Latvala, Mr. R. F.
Bruzewski and Mr. R. I. Matthaei.
He might also want to specific bis appreciation ror the
resource and advice given, in the layout and production or the
quick 1nterva1 timing transfer, by means of Mr. O. G. Skitek or the
Electrica1 Engineering Department or Missouri School or
Mines and Metallurgy.
Eleven
TABLE OF CONTENTS
Aclmowledgements •• • • • • • • • • • • • • • • • • •
List of illustrations • • • • • • • • • • • • • • • •
List of p1ates •
List or tables •
Introduction • •
• • • • • • • • • • • • • • • • • • •
• • • • • • • • • • • • • • • • • • •
• • • • • • • • • • • • • • • • • • •
Review or literature • • • ••••• • • • • • • • • •
111
Page
eleven
iv
V
vi
1
three
Early history- or blasting ••••••••••••• three
The development of blasting caps • • • • • • • • • 5
Short duration put off firing by mechanical method ••• 12
Advantages and uses of behind schedule movement blasting
in surface mining, quarrying and cl v11 engineering 14
Uses and blessings of’ short period delay blasting
structures in underground mining • • • • • • • • • • 27
Field paintings • • • • • • • • • • • • • • • • • • • • • 43
The experimental quarry •••••••••••••• 43
Equipment • • • • • • • • • • • • • • • • • • • • • 44
Blaating components ••••••••••••••••• 48
Survey of blasting practices • • • • • • • •••• fifty three
The index ••• • • • • • • • • • • • • • • • • • • fifty six
Test method~· •• • • • • • • • • • • • • • • • • 60
Round info and effects. • • • • • • • • • • • • 63
Cone lusi ons • • • • • • • • • • • •••••••••• 68
Summacy • • • • • • • • • • • • • • • • • • • • • •• seventy four
Bibliography ••••••••••••••••••••• seventy five
Vita ••• • • • • • • • • • • • • • • • • • • • • • • seventy eight
Figure
1
2
three
four
five
6
7
eight
nine
10
eleven
12
thirteen
14
15
LIST OF ILLUSTRATIONS
Cross-section or a postpone electric powered blasting cap ••
Comparative facts or on the spot and
not on time motion blasts ••••••••• •••••
One row, in series, quick period delay blasting device •••••••••••••••••
System utilized in Ohio quarries ror more than one
row blasting •••••••••••••••••••
High and occasional holes, coal stripping, blasting machine •••••••••••••••••
A blasting gadget applicable in maximum quarries •••
Delay arrangement ror a via reduce •••••••
Nonnal millisecond postpone round in potash mining ••
Millisecond delay arrangement used in a
limestone stope •••••••••••••••••
Delay round utilized in using tunnels in a
limestone mine ••••••••• , •••••••
A normal stope at the Greenwood Mine ••••••
A millisecond put off spherical used at a western
steel mine ••••••••••••••••
A spherical the usage of 30 holes where 38 holes had
• • •
been used •••••••••••••••• • • • •
Delay association in a long-hollow blasting
stope at the M:enominee Range • . • • • • • • • • • •
Order or riring and pattern or holes ror
test rounds •••••••••••••• • • • • •
iv
Page
eleven
17
19
21
. 23
25
26
29
30
32
34
36
37
39
sixty two
Pl.Ate
I
II
III
IV
V
VI
VII
VIII
LIST OF PLATES
McCormack-Deering “I-911 Tractor, with f’ront
end l.Oader ••••••••••••••••••
Caterpillar “D-411 Bulldozer. • • • • • • • • •
A view or the grizzly •••••••••••••
A view or the grizzly displaying slide £or
oversize rock ••••••••••••• • • • •
The dumping music •••••••••••••••
Panel or the blasting timer ••••••••••
Industrial survey of’ blasting results
(questionnaire) •••••••••••••••
Relationship or erriciency to put off interval
or the take a look at rounds ••••••••••••••
V
Page
45
forty five
forty six
47
47
fifty two
55
73
Table
I
LIST OF TABLES
De1ay interva1s or blasting caps or .Dir£erent producers ••••••
II Firing time at 2.Five amperes of Western
vi
Page
• • • • • • nine
Seismo Caps •••••••••••••••••• 48
1
INTRODUCTION
One of the maximum recent traits in b1asting practice is that of applying the principle of brief duration de1ay
electric powered blasting. In this kind of electric blasting, as an alternative
or having al1 holes hearth at one time, every hollow or organization of
holes is a shot in itselr. To offer a short duration delay,
of some thousar.Dths of a 2d, between every hole or organization
of holes, either millisecond (break up-2d) put off electric powered
blasting caps or a appropriate not on time movement blasting switch can also
be used.
Short duration postpone electric blasting systems were at first advanced for use through quarries in or close to city regions
so one can reduce vibration and concussion. However, it
early have become obvious that many other blessings would accrue
with using such systems of blasting.
The benefit of split-second put off electric blasting
caps for quarrying and open-pit or strip mines, as claimed
(1)
by using the manufacturers, may be summarized as fo11ows: . (1) better b~eakage (fra~nentation);
(2) managed backbreak;
(3) helps regulate throw;
(4) cuts down complaints approximately noise and vibration;
(five) cuts fee on explosives and drilling.

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