MINEBK00804

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

J.
'3 Banoy - b.
s,
,y .
,p.
~` HI~BZ g8 da Si g& IdETHODS.- Conlin.
l$4j :to raoe,- to portal, ~kb8'; Gray Copper, west drift, 100'
~'. to mnok Sall, - to' portal 4b3' ;~ Gill'ard, east drift, 60b+~ to
• taoe, -'to portal, 1,04b~; b70+ oS upraise in thi8`dritt;
Gillard, Ho. E,atarta b0U' Prom Dross-out, rtmning X30' to .;
=soe.
' • Mork- ie oonPined to •~f~•.~~-d.~ ~
~I ~ the main Lunael and .to oleaning'-apV. ell - drifts, besides ` '
thoroughly timbering tho ahaYt on t2iA Giilard vein.
;~
Tha beat~ChanOO vain la interaeoted by the Dross-tunnel
166' Prom the portal of the tnn'nel; the Gray Copper. 4b3~;
'~ Gillard, 1,04b~. ,
i
• The shaft on the Gillard'veia ie b00' deep>aad.~.te~oo~eo-
ted with the drill from the main tunnel on this vein at a
point•60E' Srom't~, tunnel. Tha shaft is+diridad into two Dom-
' partmenta, one need for a Dnoket-way and the other for a lad- .
~~ der-way. The ladder-way is properly equipped with ease and
aooeaeibla ladders and does not contain eAY air or steam pipes.
]!o hoisting la done through this shaft ana it is kept in rb-
peir,and egniPped,2or tho purpose o2 prodding an additional
ezit and for ventilation. the Dollar or the ahai't is of entii-
oient height to prevent persona Prom tripping•a,a~ falling ~~
The method of ore eztraotion will be by moean oY•driit-
~~~and over-head eloping. 8lncle hand drilling eat maohino
drillu trill ba employed.
the method oY timbering Se by poste and cape and etn22a
oovered with lagging. pine and ap='noe axe need, prepared by
hand. in good oondition, aa:: are auSYioieat to scours safety.
Undergronn,l traaming ie dono Dy hand. steel oars or the
irnaz mate are need on a traoYage oS 18" gnaga and lEE t mile.
Yery little water is encountered nau the
e7~Qa' of drainr.
ago Se by gratify. the Grade of thv tunnel beiing one-halt oZ
one par Dent. per 1L0~,
the vontilntion is good and aatnral. 'o noriona gauss
'are mvt with. -
,
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