101 



to the other rocks, beyond the fact that it is in contact to the west with 

 dark green somewhat chloritic hornblende schists, and that on the east 

 the point is tipped with a nob of hard crystalline dioritic rock. On 

 another point of the shore, one and a-half miles to the north-east of this 

 occurs a second mass of serpentine, under conditions very similar to 

 those just described. It is in contact to the west with green schists as 

 before, and the extremity of the point occupied by the same dioi-itic 

 rock, but with this difference, that between the dioritic and the serpen- 

 tine there is a dyke fifteen feet wide of the quartz-porphyry, evidently an 

 off-shoot from the main mass occupying the island off shore a little to 

 the south. The masses of serpentine in these two points, and on the 

 small island in immediate proximity to the quartz-porphyry, are nearly 

 in a line, and also in a line with the general strike of the rocks at this 

 locality ; but whether the serpentine is interbedded with the schists, or 

 was originally intrusive, it is difficult to say from the evidence available 

 in this particular case. The presence of the quartz-porphyry as an intru- 

 sion, associated with what appear to be dykes of diorite striking parallel 

 to the dyke of quartz-porphyry, would seem to warrant us in regarding 

 all these rocks — serpentine, diorite and quartz-porphyry — as different 

 manifestations of outflows along a line of fissure, probably at widely- 

 separated intervals, and altered according to the well-known tendency 

 of these rocks, or rather of their original forms." Mr. Bayley has made 

 microscopical examinations of these serpentines, and says that in many 

 of them the forms of the original olivine can be clearly seen, although 

 there is no trace of the mineral left. Dr. Lawson also reports serpen- 

 tine to be more largely developed on the inland and shore of Shoal Lake 

 Narrows than elsewhere in the region. He mentions also a boss of ser- 

 pentine projecting through the black hornblende schists in the immedi- 

 ate vicinity of their contact with the gneiss. 



Many minerals are associated with the Laurentian serpentine, but 

 very few are found in workable quantity. 



Small quantities of chrysotile have been mined for asbestos in lot 

 2, range 7, Templeton, but the fibre was so coarse and short that these 

 works were soon abandoned. 



The magnetic ore formerly smelted at the Marmora iron furnace 

 was obtained from lot 8, range 1, of Belmont. This deposit presented 



