220 GEOLOGY OF CAPE BRETON.—GILPIN. 
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ore in the Pictou coal field, where it had also been overlooked as 
valueless. Similar varieties of this ore may be found in the Cape 
Breton carboniferous when the analyst and iron smelter begin 
their search for furnace supplies. I am not aware of any com- 
plete analysis of this ore, from the Island, but samples I have 
seen would yield from 25 to 35 per cent. of iron. 
The purest variety of this ore, known as siderite, does not 
occur in the coal measures, but in this Province is usually asso- 
ciated with the limestones. It occurs at Sutherland’s Brook, 
Pictou Co,, in a large bed, and is found in a bed said to be three 
feet thick on Boulardarie Island. At this locality, according 
to Dr. B. Harrington, it yields 32.58 per cent. of metallic iron. 
It is also frequently met in veinlets, in various rocks. 
Ata point near Sydney Town, the limestone beds near the 
summit of the millstone grit, pass, in places, into beds of red 
hematite, carrying about 30 per cent. of iron. But the quality 
of the ore is such as hardly to warrant further exploration. 
At numerous points where the lower carboniferous conglom- 
erates rest on the Precambrian felsites, ete, deposits of red 
hematite are found. The ore occurs in pockets and veinlets, and 
encrusting films along the line of junction. The ore is usually 
of excellent quality, but irregular in amount. The following 
analysis of a sample from Loran, near Louisburg, will serve to 
show its quality :— 
Peroxide of drom. 2 pe. Wie aye yee sissies sah an 
Lime and Magnesia .......... a ateonso nik wily eee 
NOL OLMON Mautgey oar pr ecnaions Secale wn a tayal eae OD 
Phosphoric Acid..... Sey Agate see Oe Aaa ee , 
SOULE ore ares Fon Sin AYE ahve Syetanaet sive faralla wt Seve 
100.00 
As the ore frequently coats the heavy stones of the conglom- 
erates, it often Geceives the inexperienced miner, who finds, on 
breaking his ore, that he has lavished his affection and buiit his 
hopes on a very commonplace and valueless pebble. 
Some attention has been paid to deposits of this nature at 
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A Sa a 
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