CRANE. | Economy of Mining Operations. 855 
WEAR OF RUBBER BELTING. 
No figures were obtained which could be relied upon for 
the wear of belting (rubber belting being that most com- 
monly used). This expense is approximated with the other 
expenses, which are practically indeterminable, due to the 
variable character of the material handled, the prevailing 
acid waters, etc., etc. 
To summarize, the cost.of replacing worn apparatus per 
day is as follows: 
IRON 
IWicarrOieCruSW era awSinie rics oc eine aloes eee oie es oletanaye $0 66 
Wiiearzoturollitcre lll Shpesres ses eee ee es ee pao eps Cabin cae 4 28 
WiearsolmelevatOrnbuUckecsrnn sei ee ret mnt in ele eer 2 00 
\WV/Gene OF KeRAAN GUIBRVOES cn acscdosaccaocdouavcoundooses 4 80 
WCET ROTI CMON el hr orci a einige wat al niet ewls: 18 
Wear of spiders and linings (brass or bronze).......... 1 00 
ANCONA bs eu oe Oa nS a I TO a a $12 92 
OTHER THAN IRON (BRASS AND STEEL). 
Wiearsolacrushermjpaws oii ch rina 5 Niceiaes ale aes aera cients $1 00 
Wieartofurolleshelllsae teense income oasis le cut aSe k ie 5 Al 
Wicarotespidersyandplining cies ere er is actin sta: 1 00 
\VGRIC OLE GIRSEIN GUTS. Sa ocsococdsobadeonusouegobw sole Ss OY 
Wieatofmelevatorbucketsh(rom)ics ioe neds ee. - 2 00 
WCALsO lem ODES e (GEOUN)iergsk cates seer eh cote cso aatiee Palen) s oes 18 
KO Gena aN ne Caton ai nine atiane Mkey tt we OC hamid ooh ue acs ed $14 96 
The average cost of the wear per day on the different kinds 
of metal in the above-named apparatus is then $15.94, and as 
most mills use a combination of iron, steel, and brass, the 
above is a fair average. 
Adding to the expense of the principal wearing parts, as 
given above, fifteen per cent. of itself for the other items of 
wear not enumerated, the amount of wear is $16.03, which 
gives the expense of maintenance per day. To this must be 
added the running expenses, as labor, coal, water, lubricants, 
lights, etc., which are itemized as follows: 
COalAtGwOncOMs aa be power nents aiken Cire Mee heh he $4 00 
Labor: 2 engineers, first, $2.50; second, $1.25 per day... 3 75 
4 feeders, two at $2; two at $1.75 per day ........... 7 50 
A jig men, two at $3.50; two at $1.75 per day........ 10 50 
JL Toul Kaela, SV4 AAD [NSP CARY 5 ce doouibegoudcoacodaoenu 2 25 
iFStiperimucndentas4aper days eae i eo ee eee A 00 
Total per day...... Bag Ge en eNews ctey Steltans OUND ee cys — $21 90 
Wiaterptornboilenstmrpri runny rome ker Gs hw ere NaN oa ts 3 00 
Mubraicantsran dulio intern ietes eres eosin ay RP aS eM APNE Os Gaal Us 8 50 
