TEMAGAMI 



BY 



Willlt G. Miller. 



Lake Temagami, with its numerous islands and bays and 

 its shores covered with evergreen timber, is one of the most 

 beautiful sheets of water in North America. It is situated 

 in the Government Forest Reserve, and since the completion 

 of the Temiskaming and Northern Ontario Railway, the 

 lake has become very popular with tourists and sportsmen. 

 Fish and game are abundant in the vicinity of Temagami 

 and the numerous adjacent lakes and streams. The locality 

 is especially noted for moose and for bass and trout fishing. 



Near Temagami station there are exposures of the 

 Keewatin and Cobalt series. Within a half mile north- 

 ward of the station an iron range of interbanded magnetite 

 and jasper, which has a width of several hundred feet, is 

 to be seen. Two or three miles northward there are deposits 

 of mispickel, pyrrhotite, and copper pyrites. The last- 

 named mineral is also found near the lake. 



Good contacts of the Cobalt series with the Keewatin 

 are exposed along the railway a short distance north of the 

 station. 



The schistose rocks of the Keewatin may be divided into 

 the paler-colored and more acid varieties, which are 

 deformed quartz porphyries or porphyrites, and the more 

 deeply colored or basic schists resulting from the shearing of 

 hornblende porphyrites, basalts and diabases. The extreme 

 deformation of the more acid types produces sericite schists, 

 which reveal little or no trace of their original structure.* 



The iron-formation (jaspilyte) is similar to that of the 

 well known Vermilion range of Minnesota. It is infolded 

 with the Keewatin schists, all dipping at high angles. 



The iron- formation, in places 1,000 feet in width, prob- 

 ably represents chemical sediments that were deposited on 

 the surface of the Keewatin volcanic rocks. At the base 

 of the iron-formation, there is frequently a comparativelv 

 thin layer of fine-grained greywacke. 



Frequently the interbanded material of the iron-form- 

 ation contains 35 to 40 per cent, of metallic iron. By 

 magnetic concentration, judging from experiments that 

 have been performed, a merchantable ore can be produced. 



*Geol. Sur. Canada, Vol. XV., 1902-3, p. 128 A et seq. Map No. 944. 



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