310 -'T, G. TAYLOR AND D. MAWSON. 
Magnesia wa ad an dss wos Do 
Alkali oxides ... ase is ee Sh °48 
Sulphur od scot theese Lee ha °039 
Titanium “ies ia aha alas oes hace 
Manganese oxide ... Noe ar = bai eae 
Total... ... 99°80 
Most of the above information has been drawn from Mr. 
J. B. Jaquet’s book on the Iron Ore Deposits, which con- 
tains a very full description of this ore body, but one point 
which seems to have escaped previous observation is the 
presence of a large dyke intersecting the deposit close to 
the main spring. This dyke is best seen in a small road 
cutting close to the blast furnace about 200 yards away, — 
where it appears as a white trap about 25 yards wide, and 
has a narrow parting of talcose rock. The position of the 
dyke is evidently a fault fissure as seen by a cross section 
of it (wide fig. 2). The dyke narrows down as it passes 
through the ore body and is lost some distance on the 
other side. 
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Fig. 2—Sketch of Section of dyke which intersects the iron ore deposit. 
(The section is taken through the dyke 200 yards to the north-east of the 
deposit.) 
