MINEBK01143

• County: Boulder
• Volume: 16
• Document: Inspectr
• Suffix: A

Boulder County - 4.
E%PI,OSIVES.
Independent Giant powder - 40~i, Garman fuse, 6-% oape and
wooden tamping bare are employed. Explosives in exoesa of one
day's supply are not stored underground.
The average amount of explosives kept in atorpge is 2,000.
This is stored in a~Prsae, iron-oovered magazine aitttate 2b0~
west of the portal of the tunnel and used for the storage of
powder only. 611 other supplies are stored in the compressor
room. .
Bo devioe Yor thawing powder ie provided ea, the kind of
powder employed dose not harden exoept in extremelS* oold weather.
pgIIIING & 14I IIE ZI' ETHODS .
The main.opaning is a Dross-cut tunnel 3.200' in length,
~ 6'a7' in the olear and with a uniform grade of lei. The first
50' 03 the tunnel ie timbered with poata.and oape. 6t a diatanoe
of 3,148' from the portal the Boulder County vein is interaeo-
tad and a drift run west on the vein 1,400' and seat 60U'. 6t
the breast o±' the seat drift a shaft oonneots with the aurfaoe
and ie 800' in depth. 6e soon as this shaft Dan be placed in
~: good condition and nowly equipped it will Yurniah an additional
i
eait Tor the employee. On the. west side of the tunnel is s shaft
1,200' distant and 30U' 1n depth. It does not oonneot with the
tunnel and hen been. abandoned.
6otive work is oanfined to the atopee on both aides of
li the tunnel in the east-a~td west drifts and also oloaning out the
II west drift its entire length.
6t a diatanoe of 60' from the portal of the tunnel an up-
raise is made to the aurfaoe and is used Yor an additional salt.
The upraise ie equipped with safe and aooeaeible ladders and ie
~ kept in good repair. iteoommendationa were given to provide a
i good and suffioient door to prevent admission of noxious gases
in ease of eooident,by fire and pleoe the same at a diatanoe of
`~ ~ ~0
~/ __
from and inAide the portal oY the tunnel, the doors to be