124 ANNAL8 NEW YORK ACADEMY OF SCIENCES 



The ore consists of a dense red hematite, high specific gravity, with 

 bright metallic luster and a highly developed cleavage. The ore is of the 

 non-bessemer type. 



These deposits are now being mined two miles from the oulerop, under 

 the sea. The quality of the ore has slightly improved with depth. 



TORBROOK AND NICTAUX DEPOSITS, NOVA SCOTIA 



Several beds of hematite of a similar type to the regular Clinton ores 

 have been located at Torbrook and Nictaux, Nova Scotia. The two 

 principal beds are the so-called "Shell" vein and the Leckie vein. Sec- 

 tions of this deposit may be found on page 147. 



MIRA VALLEY DEPOSIT, CAPE BRETON, N. S. 



The ore deposits of Mira Valley, Cape Breton, N. S,, are interbedded 

 iron ores much like the Clinton deposits. Professor Woodman in his 

 report (356, II-12-(3)) says in reference to them: 



"The iron-bearing minerals are magnetite, red compact hematite, specular 

 hematite, and possibly siderite in small amount. They occur in bands, inter- 

 stratified with the sediments. In places they grade imperceptably into the 

 latter across the bedding, and often downward or on the dip and longitudinally 

 or on the strike. . . . These ores furnish perhaps the best examples known 

 of partial and interrupted replacement." 



Section on McKinnon farm : Inches 



Slate wall 



Red hematite 3.0 



Slate 1.5 



Quartzite 1 . .5 



Magnetite 1.0 



Slate O.o 



Ronald McDonald farm : 



Slate 



Ore 1.0 



Quartzite 2.0 



Slate 1.0 



Ore 1..5 



Slate 



Summary of Theories of Genesis 



The origin of tlie Clinton ores has long been the subject of dispute, 

 and even to-day, witli tlie large amount of data available, we find con- 

 siderable diversity of opinion. Mining men, owners of mines and those 



