125 



Miles and Five miles (8 km.) in a southwesterly direc- 



Kilometres. v ' . . J 



tion, is the abandoned 

 23 m. Foxton Mine. Foxton phosphate mine. 



36-8 km. This was opened in 1878 



by James Foxton, and from it calicum phosph 

 ate was mined for the manufacture of ferti- 

 lizers. This mineral is found in segregations 

 within pyroxenite intrusions which cut the 

 Grenville gneisses and crystalline limestones. 

 The mineral varies in colour from sea-green, 

 through reddish, pink, greyish, to brown, and 

 is usually in large crystalline masses, but 

 occasionally in finer granular masses or 

 "sugar-phosphates". The pyroxenite intru- 

 sives cut the Grenville gneisses and crystalline 

 limestones, and are therefore clearly of later 

 age. The pyroxenite itself is cut by dykes of 

 more acidic character ranging from diabase to 

 pegmatite. The close association of many of 

 the largest deposits of apatite with these later 

 dykes would suggest that the development of 

 the phosphate in the pyroxenite was partly 

 due to these later intrusions. The phosphate 

 does not occur as true veins or fissure fillings, 

 but rather as segregations or pockets in the 

 basic pyroxenite intrusives. Where these latter 

 conform to the gneissoid structure of the 

 country rocks, a banded appearance, sug- 

 gestive of vein structure, would naturally be 

 produced. This occurrence is extremely like 

 that of the phosphate deposits of Norway, 

 which are described by Broegger and Reusch 

 as occurring in basic gabbro. 



After a careful study of all the phosphate 

 deposits in Canada, Mr. E. D. Ingall says 

 "The phosphate bodies are distributed 

 through these belts in the most irregular 

 manner. In a few instances they show a 

 general extension of the phosphate in a plane, 

 which gives them the appearance of having 

 followed a vein, but there are no walls, nor 

 sharp planes of division which persist for any 

 distance between the phosphate and the 

 enclosing rock. Most of the excavations 



