IRON AND OTHER ORES OF ONTARIO. 185 



and the exLinction in the several cases noted is sharply parallel to it. 

 These characters together with the ti'aces of the obtuse dome so 

 characteristic of sections of enstatite are sufficient to identify it as 

 that mineral in an altered state. The occurrence of the enstatite 

 in this dyke in its finer grained parts towards the contact is analogous 

 to, and an interesting confirmation of the similar occurrence of the 

 mineral noted in the Jack Fish Lake dyke also in the vicinity of its 

 contact. 



To summarise, the main points of interest are, briefly : 1. Post 

 Archaean age of dykes. 2. Their problematic relationship to traps 

 of Animikie and Keeweenawan. 3. Their uniform strike and width. 

 4. Sharp contact. 5. Passage from coarse texture at centre to 

 aphanitic at sides. 6. G-ranular character towards centre, porphy- 

 ritic at sides. 7. Prevalence of quartz and garnets towards centre 

 and absence near contact. 8. Presence of enstatite at sides, absence 

 towards centime. 9. " Chloritic substance " abundant at sides, absent 

 towards centre. 10. Polysomatic character of augite throughout. 

 11. Uralitization of augite. 12. Very marked conti-ast of texture of 

 two different pai'ts of a rock mass which solidified under practically 

 the same pressure but at different rates of cooling. 



Mr. James T. B. Ives, F.G.S-, read a paper on "Iron and 

 the other Ores of Ontario." 



The Secretary of the Bureau of Industries, Ontario, Mr. Archibald 

 Blue, in applying himself to the task of compiling a report of the 

 mines for the year 1884, wrote : "the only records we have for the 

 whole province are those of the censuses taken by the Federal G-ov- 

 ernment, for the first time in 1871 and again in 1881." "These," he 

 adds, "are very meagre, for the only information they give, relates 

 to the quantity of raw mineral products for the year preceding the 

 one in which the enumeration is made." The opening M^ords of that 

 report are : "A country so rich in mineral resources as Ontario 

 should be able to exhibit a good record of operations from year to 

 year." However, Mr. Blue succeeded in compiling a report in which 

 fourteen iron mines are noticed ; and the following yeai-, 1885, some 

 others were reported upon by the same official writer. Those notices 

 include statements as to the depth and underground extension of the 

 workings the quantity of ore obtained, the number of men employed 

 and in several cases analyses of the ore. Moreover, it is stated in 



