OD, GEOLOGY OF CAPE BRETON.—GILPIN. 
mineralogically at many points, but has been found in workable 
amounts only at Salmon River, in the East part of Cape Breton 
County. 
Here the old coves of the precambrian shores were filled with 
carboniferous shales, conglomerates, and limestones. At the 
McCuish mine the ores are found in irregular bedded layers, in 
a soft arenaceous shale, up to 18 inches in thickness. At the 
Eastern mine, the ore occurs as a bed underlying a soft mangan- 
iferous limestone, the ore varying in thickness up to 8 inches. 
The following analyses by Mr. Hoffman of the Geological 
Survey will show the character of the ores :— 
Sample No. 1, Pyrolusite, with a little Manganite, gave— 
Bim@xide en. aus Oar A Saleen oe 81.52 per cent. 
Sample No. 2, Pyrolusite, gave— 
1 By TO Vep- O10 Kena OM Eee eA NO Ot aoa 88.98 per cent. 
BP erhie cOxldew H. cia ieicgge ee ences ts 21 . 
Ores represented by the above analyses would be adapted for 
all the uses to which the mineral is usually put, and especially 
for glass-making. 
These deposits are worked by Mr. E. T. Mosely of Sydney, 
and it is to be hoped will form a permanent addition to the 
mineral resources of the island. 
Of the more impure and at present valueless varieties of 
manganese ores, that occurring in surface layers, like the bog 
iron ore referred to, is the most common. This is usually pre- 
sented asa loose friable earthy mineral, of a brown or black 
color. It is known at several points in Cape Breton, the largest 
deposit is perhaps that found near Big Harbor, Bowlardemes 
which contained :— 
Manganese “Ve. tins cee eto 25.42 p. e. 
Walters 82S. cine are seer tect ocean ereuetens 32.52 “ 
Other samples from this locality vielded me on analysis some- 
what larger percentages of manganese. Another sample from 
Lewis Bay, Grand Mira, yielded Mr. Hoffinan : 
Manganese oroxide (available)........ 44.96 p. ¢. 
Insoluble mater. ccs «cng sees doco 
