MINEBK00457

• County: Boulder
• Volume: 13
• Document: Inspectr
• Suffix: A

,American - 4.
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The main opening is a shaft 550' in dapth;.aribbed with
8" x 10" timbora,for a distance of 40' from ,tho aurfaoe and
with atolls and Nall,platea in the remaining part of the shaft.
The shaft is divided into two compartments; one, 3' x 3' and one,
3~' z 3' in size. The ladder-way oontains steam. air and water
pipes, is properly equippod with safe and aaoeeaible ladders
and has landings 20' to b0' apart.
Drifts are run as follows: b0-ft. level; east, ?.00' and
west. 1b0'. 100-f~. level; east, 200' and crest, 7b0'. 200-ft.
lovel; east, 2b0' and went. 3b0'. Op to this point the ohaft
is tull,of water and length oY the levels oannot be given.
Aotive work ie oarried on.in tho oast, 100-ft. drift
land in the two drifita of the 200-ft. level by.driiting and
atoping.
An additional exit is provided by, an air shaft that son-

;Hoots vrith tfia 100-ft. lovel at a diatanoo oP 300' wont of tho
main shaft. Tho oxit is oribbed with hewn timbore, kept in good
~aondition and proporly equippod vrith aaie and aooeaaible timbors.
The mothod amployod for hoisting 1a steam. The men aro
dowered and raisod with tho hoisting maahinor,/. A weight of
i1,000~ is holatpd at ono tlmo with n 7/©-inoh steel wire oable
!that has boon in use ono yoar and 1a in good oonditioa. d safety
!hook and ahaln with swivel, in use one yoar, is used and is 1n
good aoadition.
The Colorado Iron "forks Dodo of aigaale and pull belle
aro opployod.,The ball line is 1/4-in. trriat Trize in good oon-
dition. T2-.e node of signals and othor required aotioas aze post-
ad in their respootiva plaoea.
Timboriag, reatilatioa, eafitary oonditione. eto. are good
end auttioient.
Underground traraaing !A dono by hand pith steal oars oa a
traokage of 14" gunge and b! ? rails.
The troter la the shaft io handled with a buoket attd oaueos
no laooavoaieaoe.