MINEBK00804

• County: Boulder
• Volume: 12
• Document: Inspectr
• Suffix: A

Alton - 6.
s•
MINI HG & MZIIE METHOD 8-Contin.
eta but no order #1t to this eiYeot is posted at e2~y point'.
Bnokets are loaded by hand. Ho skids are required ae the shaft
ie vertical. Level stations aro not provided with passage-way
around the working shaft. Ho guard rails have been planed at
stations. Pillars of ground have been left on eaoh aide of
the shaft and the shaft is unusually safe as it has been sunk
in solid ground.
The tunnel ie 1700' in length, timbered with posts and
oapa and lagged oa top and sides for a dietanoe of 160'. At
a dietanoe of 47b' from the portal the Pineahade vein is in-
teraeoted. Drifts have been run on this vein both waya.~The
east drift 1a 200' end the west drift is 47b' long. At a
dietanoe oY ti12' from the portal of tunnel the Tungsten •eia
~.
is oroeaed. One drift has been run oa this vela ea9t 40'.
At 806' the Maa~oth vein le oroeaed. IIo work has boon done
on this vein. At 912' from tho portal the Little Jimmie voia
is oroeaed whore drifts have been run 460' east and 47b' west.
This vein oairiee a high grade silver ore. Ho wor& is belag
dono in tho tunaoj et tho prosent time.
The tunnel le providod with autfioient doors and at~.a
reasonable dietanoo from the ontranoe to prevent admleaion
of nozloua tnmsa~if file should odour. The doors oan be oper-
aced from without.
At a point 96' from the portal an upraise, oonneoting
with the anrfaoe 60' above, has been made. This Se kept in
good ooadition, properly equipped with safe and seonse ladder
and ie easily eaoeaeible. - - - - ,
T.~e method oz ors e;trsotipa is overhand atoping gad
drifting by means of Chioggo,Ynenmgtio and fiardeog maohine
~ drills. Both single and double,head drilling ie also need.
Th0 method,of timboring is poets and oapa sad stalls
oovared with legging. 4lmbero era prepared by hand iron epraoe

and pine, are Sn good ooaditloa end are enfflolent to eeonrs
safety.