MINEBK01009

• County: Clear Creek
• Volume: 12
• Document: Inspectr
• Suffix: A

Big ~ ive - 4.
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• SIIRFACE PLART -Contin.
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Suitable proteotion against fire is provided by means of
thb City hydrants of Idaho SprinCe, Colo. Eleotrioity is used
'Yor lighting.
E% P L 0 3 I Y E S.
Gelatine, 40;0, powder, German Inaoloid fuse, bX Daps and
wooden tamping bare are used: Explosives in exoesa of one day's
supply are not stored underground.
The average amount of explosives kept in atorngo is 1,000.
This is stored in n framo, iron-oovored magazino situate Z00~
southeast of the entrnnoe to tho tunnel.
Ao dovioo Yor thawing powder is provided.
MI HI SG & MII(E METHODS .
The rain opening is tho Central Tunnel which is a oroes-
tunnel intended fbr drainage, transportation and for the devel-
epaent sf the veiae belonging to the Big Five Tunnel, Ore Rodua-
tion and Transportation Coripa~fy. The Central tunnel is 8' a 8'
in the olear and 8,800' lo~.'The first 300' of the tassel is
lluilt or stono and eement.'Boyond this point no tinborinr ie
Yequlred. Nor a diate.noe of 2;000' the tunnel ie double-traok-
ed, with side traoks every •700'. Ttie onlg work bo1nC oarrled
4n is the extenaiea oT the tunnel. Leyaer aaohine drills are
euployod ier this purpose but no hand drilling is done.
IIndereround tramming is Bono with a horse. Steel oars
with n oapaoity eY two toss oeah.are need on a traokago of 24"
guaCo and 20~ T rails. .
Only a eaall eaount oT venter has to be dealt with sad
this is disposed of by tho gravity egatea.
Ventilation is supplied by a Root euotion ins through
ea 8-inoh pips. Tho Sna is run by a 2b h.n. eleotrio aotsr.
This system of ventilation is sufYioioat ae no aoziouB ~ase•
aro sot with.
The sanitary oeaditioas aze good sad ell eld tiabere hsre
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