MINEBK00847

• County: Lake
• Volume: 14
• Document: Inspectr
• Suffix: A

41:3
(2}
fo metal tamping bare allowed,wooden'tamping bare provided-No
powder man employed-Explosives are stored in magazine 300 feet
'Tom worKinga-Average amount ofpowder kept in storage:-1500 lba
3haraoter of magazine:-Steel plate-T,Sine hea devise for warming
~o~a-der-Stem.No oile,eandles or Combustible mstter stored with
powder.
li ining.
The main opening to the mine is the Yak tunnel which has been
driven in a north east direotion fcur and one half miles from
its portal in California gulah,there ie also three and one half
miles of lateral tunr:el driven in different direotions to oon-
nect with the mines along its course.
The tunnel 1a connected with different shafts ae follows:-1'lhite
Cap-Louisville-Imes-North 1!oyer-South llike-Resurrection-Dolly B
rortune,and Ibex No. 4.
Hoisting.
Hoisting is done from an interior shaft known ea the Cord winze
which is 575 feet below the tunnel level-Method employed -Elec-
tricity-1Yeight of load hoisted:-4000 1ba.Distance hoisted 575 ;
feet-Cable 3~4 Roebling ateel,in use 16 montha,faatened to oage
by clamps and thimble-Gaga equipped with bonnet, and safety i,
clutohes,xhioh are examined weekly-Cagzr is employed-Fell line
of 3/g steel rope-Llining Bureau code of signals vsed,whlch artl
(posted at engine,aiid levelo,alao notice prohibiting Perecns ;'
(from riding on loaded cage, and stating number to ride-O+Iirlee of
Oregon pine 4 X 4 inches-Guard rails Provided at stations and
mill holes-Shaft is not being sunk.
Lone methods,
Method of ore extraction by stoping and drifting-l.laohine drills
are emplcYed of Waugh,Sulliven,ingersoll,and Leyner patterns.
Single and double hand drilling also used.
Timboring:-80.uere setts and criba,also drift r+etta.Ordinary
mine ohutes used in mine-Tramming done b y eleotrio motors, with
Truax aide dumping oars on 30 ib.to the yard rail.
Drainage,
Amount of enter dealt with in gnls.per minute:-1500.-System by
tunnel-Ventilation-Narurai draft,++ufficient-No noxious gases.
Exits.
Shafts are divided into tiro and three oompartmenta with ladders __
e+r-