COLLECTIONS IN ECONOMIC GEOLOGY AND METALLURGY. 



61 



Matlcslai/.,. 



Silica (SiOj) 



Alumina (AI2O3) 



Protoxide of irou (FeO) 



Lime (CaO) 



Magnesia (MgO) 



Sulphur (S) 



Nickel and cobalt (Ni and Co). 

 Lead (Pb) 



St. Joe. 

 1st. 



Per cent. 

 31.41 



2.13 

 48.58 

 11. 43 



4.88 



0.81 



1st. 



Per cent. 



28.20 



7.10 



40.00 



11.40 



6.00 



1.70 

 L.'JO 



Mine La Motte. 

 2d. 



2d. 



Per cent. Per cent. Per cent. 



35. 27 



1.97 



36.36 



14.14 



9.43 



0.71 

 1.74 



38.20 

 13.10 

 33. 00 

 8.90 

 C.OO 

 2.56 

 1.46 

 2.30 



3d. 



39.34 



22. 38 

 18.53 

 12.28 



2.26 

 2.22 



The pig lead produced by the cupola smelting contains considerable 

 subsulphide of lead and has to be refined. 



The composition of the different mattes varies greatly, especially as 

 regards the amounts of the more valuable metals, cobalt and nickel and 

 copper, they contain, as is well illustrated by the following series of 

 analyses made by Mr. Neill from the Mine La Motte works. 



Roasted first matte. 



Nickel and cobalt (Ni and Co) 



Copper (Cu) 



Lead (Pb) 



Iron (Fe) 



Sulphur (S) 



Insoluble residue 



Per cent. 

 3.12 

 1.79 

 13.68 

 46.44 

 6.34 

 3.76 



Per cent. 

 3.66 

 1.05 

 7.96 

 58.14 

 3.09 

 3.24 



Per cent. 



17. 54 



45.00 



8.21 



3.08 



Baw second matte. 



Nickel and Cobalt (Ni aud Co) 



Copper (Cu) 



Lead (Pb) 



Iron (Fe) 



Sulphur (S) 



Insoluble residue 



Per cent. 

 12.88 



4.33 

 33.50 

 28.47 

 18.15 



0.36 



6.51 

 2.25 

 23.96 

 48.05 

 16.52 

 0.46 



Per cent. I Per cent. 



3. 89 ' 12. 31 



1. 04 2. 60 



23. 37 29. 52 



40.80 26.98 



Baw third matte. 



Nickel and Cobalt (Ni and Co) 



Copper (Cu) 



Lead(Pb) 



Iron (Fe) 



Sulphur (S) 



Insoluble residue 



Per cent. 

 20.19 



7. 15 

 36. 77 

 14. 4.^ 

 23. 68 



Per cent. 



I1.18to9.98 



7. 27 



30. l(i 



15.74 



20.59 



Per cent. 

 17.01 

 6.75 1 

 20. 69 

 29. 74 I 



Per cent. 

 15.22 

 4.31 

 39. I.'") 

 il.OI 



