SOUTH CHETICAMP, CAPE BRETON ISLANLX GRANDIN. 357 



The Grandin brook deposit is owned and s being developed 

 by the Cheticamp Copper Company, Limited, Halifax. 



As all the deposits of the L'Abime area resemble one another 

 very closely in the mode of occurrence of their ores only the 

 peculiarities or exceptionally well developed structural features 

 of the following deposits, will be described. 



MoLintain Top. — The Mountain Top deposit outcrops in the 

 deep gorge of the McLeod brook near the mouth of the Grandin 

 and immediately beneath the " copper schists." It consists of 

 four distinct beds of schist which in descending order are as 

 follows : — 



1. Chlorite. Not explored. Thickness not determined. 



2. Serecite, 4-J- feet thick. 



3. Chlorite, 25 " 



■i. Serecite, about 50 " " 



These rocks outcrop on or in close proximity to an anti- 

 clinal axis which pitches S. S. W. at about 10°. Along the 

 crest and flanks of the fold, undulations have been developed 

 with their axes parallel to the axis of the main fold. No. 1 is 

 harder than normal varieties of chlorite schist and carries 

 auriferous arsenopyrite associated with chalcopyrite in lenses 

 and veins of the compression type (Fig. 4.) The lower chlorite 

 No. 3 is very much softer than No. 1, and is remarkable for 

 its crumpled and contorted folia. It carries arsenopyrite and 

 pyrrhotite in lenses and veins similar to those of No. 1. In 

 No. 2, the ore is also distributed in much the same way, and 

 consists principally of auriferous arsenopyrite. No. 4 is a very 

 hard serecite approaching quartzite in appearance and hardness. 

 The planes of shearing A'hich are here well developed are 

 grooved and fluted in the most beautiful manner so that portions 

 of the rock have some resemblance to prostrate Corinthian 

 columns. Veins of the compression type predominate in this 

 bed. The ore is more concentrated for about 10 feet below its 

 junction with No. 3, and from this zone samples of arsenopj^rite 



