186 PROCEEDINGS OP THE CANADIAN INSTITUTE. 



nearl}' eveiy case whether the ore is Hematite or Magnetite. These 

 rep^ rts of the Ontario Bureau of Industries are the fullest account 

 we have of the mines of tlie Province. 



Next to these ranks the report issued in 1882 by the Department 

 of Agriculture, Ottawa, on the mineral resources of the Dominion, 

 in which each province is treated separately in i-eference to its own 

 nlinerals. In tliat report about twenty localities in Ontario are 

 mentioned, where iron was then being, or had previously been 

 worked. 



I only find five mines of iron ore mentioned in the Geological Sur- 

 vey Reports. A catalogue was, however, compiled last year of the 

 minerals exhibited at the Colonial Exliibition, and the iron ores in- 

 cluded in that list represent about a dozen different mines. 



In Professor Chapman's Outline of the Geology of Canada, de- 

 scj ibing the Laurentian formation, he states that it contains " beds 

 of magnetic and specular iron ore." In reference to the Gananoque 

 and Northeini Townships District he says : " Although not favour- 

 ably adapted, as a rule for agricultural occupation, the district con- 

 tains valuable economic minerals. The principal of these comprise : 

 The iron ores of McNabb, Bedford, Crosby, Sherbrook, Madoc, Mar- 

 mora, Belmont, Limerick, Minden, Snowdon." Again, describing 

 the Hu Ionian strata in the region of the Upper Lakes, enumerating 

 their more important economic minerals, the same author mentions 

 " the iron ores of Echo Lake, Michipicoten River, Pic River, etc." 



Of course the notices of one writer often refer to the same mines 

 as those of another. I have, however, jotted down the localities on 

 the map now exhibited and find that the total number of mines 

 recorded is thirty, as follows : — In the County of Haliburton, Lut- 

 terworth, Minden, Glamorgan and Snowdon; in Peterborough, Gal way, 

 Silver Lake, Balsam Lake, Blairton, Marmora ; in Victoria, Digby ; in 

 Hastings, Wollaston, Madoc, Tudor ; in Renfrew, Bagot, McNab ; in 

 Lanark, Darling, Lavant, Sherbrooke, Bathurst, Perth ; in Frontenac, 

 Palmerston, Bedford; in Northumberland, Seymour; in Algoma, 

 Bruce Mines ; also bog iron at Sarnia and Normandale. The map 

 I have colored to represent the various formations of the Cambro- 

 Silurian, Silurian, and Devonian systems, which overlie the Archean 

 rocks of this area. My object in doing so is this : I wish to show that 

 all these iron deposits appear to occur in the Archean rocks, with the 



