LONGITUDINAL SECTION

PLAN

Drilling Method, No. 2: Five drills in heading, mounted onthree columns; the holes marked with a cross (X) were drilled with thedrills on the center column.
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
Heading190-22035-42134-1966½-85.4-6.03.9-5.05.328 to 32.20.7-26.5
Bench110-1305579-10642.-2.41.4-2.013.727.-33.19.2-27.4
Total1955.-65.39.9-53.9
Per cubic yard, whole tunnel section2.9-3.42.1-2.8
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, 6 sticks each

60 to 72
Total Sticks160 to 235
Total Pounds134 to 196

Sub‑bench:

8 holes, 4 to 6 sticks, each

32 to 48
Bench:8 holes, 6 to 8 sticks, each46 to 64
Taking up bottom, average15
Total Sticks95 to 127
Total Pounds79 to 109

[Fig. 3.]

CROSS-SECTION