LONGITUDINAL SECTION

PLAN

Drilling Method No. 3: Heading same as second method, butlarger lift taken off bench, and lift holes drilled in bottom bench inorder to get down to grade in floor. Bench kept closer toheading.
Per RoundPer Cubic YardPer linear Foot of Tunnel
Total Depth DrilledNo. of Cubic YardsPounds of DynamiteAdv.Linear Feet DrilledPounds of DynamiteCu. Yd.Linear Feet DrilledPounds of Dynamite
Heading190 to 22035 to 42134 to 1966½ to 85.4 to 6.03.9 to 5.05.328 to 3220.7 to 26.5
Bench145 ” 19090 to 110118 ” 1676½ ” 81.6 ” 1.91.3 ” 1.813.722 ” 3617.8 ” 24.7
Total1950 ” 5838.5 ” 51.2
Per cubic yard, whole tunnel section2.6 ” 3.12.0 ” 2.6
Blasting Notes: Number of Sticks
Heading:

First Round: 2 to 3 relieving holes sprung, with 4 to 5 stickseach

8 to 15

8 cut holes, 7 sticks each (sometimes shot twice)

56 to 112

First side round, 6 holes, 6 sticks each

36

Widening and dry holes, 10 to 12 holes, 6 stickseach

60 to 72
Total Sticks160 to 235
Total Pounds134 to 196

Sub‑bench:

4 widening holes, 4 to 5 sticks each, 2 rounds

32 to 40

6 down holes, 5 to 7 sticks each, 2 rounds

60 to 84
Bench:

4 down holes, 5 to 7 sticks each

20 to 28

6 to 8 lift holes, 5 to 6 sticks each

30 to 48
Total Sticks142 to 200
Total Pounds118 to 167

[Fig. 4.]

CROSS-SECTION

LONGITUDINAL SECTION