MINEBK00134

• County: Clear Creek
• Volume: 15
• Document: Inspectr
• Suffix: B

14'7
Joaephiae Tun.-4.
_. .... - ,. ~E:%: P L U: STY E: S - Contin. _
situete,.7,b' north oP.the:porta7, o.f•the tunnel. The magazine is
used.'fox the:storage:o3•powder only all other auppliea being
,kept. in he ~ ore, house.., _ . _. .,..
The.'devioe.for thawing:_pawder ie.a:tin.tank heated::by means
oY hot water. _ -
._ P;:MI~NIIIG ~ MIIJE METHOD S .
Three .tunnels; parallel and one .cibove '.tYi'e. other on the
same vein, have':bean driven. The main 'opening is°Tunnel Bo, l
whioh is 1,400' is length. It is timbered with poets and Daps
for a.distanos.;of..7b:.from.the..portal.:The tunnel ie driven on
the vein its entire length exoept for"a Yew feat at the portal.
-Stoping..has•been done to a heightoY 110'•and within 200' of
the breast of tha.tunnel~ An:upraiee of llb' has been made at a
dietanoe of 740'•from the portal to oonneot with Tunnel No. 2.
The upraise is kept in good repair, properly equipped with safe,
eeoura sad aooeasible ladders and is used for ventilation and an
additional.axit. ,; ,:: .. ,
Tunnel Ao. 2 is 300' ,long and Tunnel No. 3 is 60' long.
Do etoping has bean done in theae.two tunnels and~no work is
dons in elthar and at this time. The entraneo.to Tunnel No. 3
is 76' west of Tunnel No. 1 and intereaot's the latter tunnel
160' from the portal of No. l Iio. 3 Sa now used for an entrance
to the main tunnel and No. 1 is abaudonod.
Antiva work oonaiate of extending Tunnel No. l and etoping
near tho breast of this tunnel.
An additional exit,ie provided through a oroea-tunnel
that has bean driHen.Whiph'intereeate the main tunnei.at a dia-
tanoe of 600' from. the portal of the latter..Tho exit:ls kept in
good repair and ie eaoily aooesaible. ~.
The method of ore oxtraotion le overhand etoping and
~, . .
drifting by means of aingle han8 dr1111ng. Ho maohina drillo
,, ,
era employed.