240 MINING INDUSTEY. 



The wagon samples and mill samples always differ somewhat in yield, 

 and the former is usually the higher in value. It is reasonable to believe that 

 the finely-crushed material being intimately mixed by the process, should 

 furnish a fairer average; nevertheless the value of the mill sample depends 

 very much on the manner in which it is taken. Not only may it chance that 

 the sample is caught just after an unusually rich or poor shovelful of ore has 

 been supplied to the battery, but accident or neglect of proper precaution may 

 affect the value of the assay. The dish or vessel placed to catch the crushed 



Iron mortars, 3 |20 00 



Scorifiers, 6 ,. 88 



971 11 



Labor and materials in repairs $115 70 



Printing and stationery 41 33 



Sundries 35 50 



192 53 



Salary of assayer 1,400 00 



2,563 64 

 Deduct cash, received for assaying ore for outside parties 242 25 



Totalnet expense 2,321 39 



Number of assays made, 4,020. Cost of assaying, 57f cents for eacb assay. 



Assay department, for BwlUoii, from July 1, 1868, to July 1, 1869, (12 months.) 



Materials consumed. EXPENSE. - Cost value. 



Crucibles, 52 $247 63 



Crucible covers, 7 15 29 



Mufaes, 4 6 72 



Annealing cups, 50 8 50 



Charcoal, 3,809 bushels 1,328 15 



Boras, 1,302 pounds : 355 42 



Eesin, 255 pounds 16 32 



Bone ash, 73 pounds 14 60 



Lead, 25 pounds 5 00 



Acid, nitric, 217 pounds 119 98 



Acid, sulphuric, 18 pounds 10 94 



Acid, muriatic, 7 x^ounds 4 55 



Kerosene, 5 gallons , 3 00 



Buck gloves, 24 pairs , 37 00 



2,173 10 



Labor and materials in repairs $194 71 



United States license for assaying one year, ($500 cuirency) 364 61 



Sundries 38 00 



597 32 



Salaries of assayers and melters 6,007 15 



8,777 57 

 Deduct cash received for assaying bullion for outside parties..^... ^ 36 75 



Totalnet expenses ^..... 8,740 82 



Bullion assayed, 1,099 bars— Nos. 831 to 1,929, inclusive. 



Value, $1,949,925 17. 



Cost of assaying, ^\ of one per cent, of the value of bullion assayed. 



