59 



This unconformity should be compared with the 

 Laurentian-Steeprock contact visited at point No. 2. 



The Anorthosite and its contact with the Keewa- 

 tin. — This contact is exposed on the south shore of Bad 

 Vermilion lake about half a mile (o-8km.) west of the 

 Golden Star mill. 



Dykes of anorthosite may be seen cutting the Keewatin 

 and small areas of the coarse-grained variety are exposed 

 near the end of the trail which leads to the top of the 

 ridge. 



The Golden Star Mine. — The Golden Star mine re- 

 sulted from a prospectors' "rush" in Rainy Lake district 

 eighteen years ago. A well-equipped surface plant was 

 installed and underground workings totalling 3,500 feet 

 (1,065 m.) were carried to a depth of 537 feet (163 m.). 

 The ore body, which was a quartz vein associated with 

 aplite dykes, carried values chiefly in gold, with small 

 amounts in silver and copper. The gangue was principally 

 aplite and ferrodolomite. All operations ceased thirteen 

 years ago (1900) and the plant was burnt in 1910 (16). 



ANNOTATED GUIDE. 



(Mine Centre to Bear's Pass.) 



KUometres After leaving Mine Centre, the railway fol- 

 lows the south shore of Turtle lake, and proceeds 

 almost due west for about 12 miles (19-3 km.). 

 The country is flat and, to a large extent, 

 swampy. Occasional exposures of Keewatin 

 rocks, greenstone, diabase, and green schist, 

 may be seen. A short distance north of mile- 

 post 195 is the location of the Olive gold mine, 

 a glimpse of which may be caught from the train. 

 The mine is an old one, having been opened up 

 at the time of the Rainy Lake gold rush, but 

 is at present inactive. A drift-covered area of 

 Keewatin rocks extends to about mileage 200-5 

 (323 km.). 



200-00 m. Farrington — Altitude 1,154 ft. (352 m.). 



322 • o km. In this neighbourhood rock exposures are rare. 

 Hills of the basement complex may be seen here 



