6 9 



Windsor — Alt.: 580 ft.; 176-3 m. The salt produc- 

 ing area of Ontario 

 is situated about the southern end of Lake Huron and 

 along the shores of River St. Clair, Lake St. Clair and 

 Detroit river. The salt is derived from the Salina forma- 

 tion of the Silurian. The beds are encountered at a depth 

 of about 1,000 feet (304-8 m.) from the surface, and they 

 show, in some cases a thickness of more than 200 feet 

 (60-9 m.) 



The most important salt wells now in operation are 

 situated near Windsor where the first well was sunk in 

 1892. The following log will serve to indicate the strata 

 penetrated in this area: — 





Thickness. 



Depth. 





Feet. 



Metres. 



Feet. 



Metres. 



Drift 



Limestone (Onondaga and Upper 

 Monroe) 



Sandstone (Sylvania) 



Limestone (Lower Monroe) 



Salina 



136 

 434 

 136 

 350 



41-34 

 I3I-94 



41-34 

 105-4 



136 



570 



706 



1056 



41-3 

 173-2 

 214-6 

 321-0 













In drilling the wells, a ten inch mud casing is driven 

 down to the solid rock, and forced into the stone sufficiently 

 to render the joint watertight. The hole is then carried 

 down with a diameter of 6\ inches (15-8 cm.) into the 

 salt beds. A pipe, of the diameter of this hole, is extended 

 about 800 feet (243-8 m.) to cut off mineral waters: in 

 some cases, it is continued to about 1,300 feet (396-2 m.) 

 in order to exclude the upper salt beds which are not quite 

 as good as the heavier lower beds. A 3! inch (8-9 cm.) 

 pipe is placed inside the larger pipe and is extended to 

 the bottom of the hole. Water is forced down between 

 the two tubes and is made to ascend the inner tube after 

 becoming saturated with salt. To lift the brine a one- 

 inch air tube is carried down about 600 feet (182-8 m. 

 inside the $2 mcn pipe. From this tube air is allowed to 



