300 TRANSACTIONS OF THE CANADIAN INSTITUTE. [VoL. II. 



In New Jersey the formations are locally divided into: i. Massive 

 Group. 2. Iron Bearing Group. 3. Gneissic and Schistose Group. 



It is suggested that the Iron Bearing Group is the same as the 

 Canadian " Grenville Series." It is also considered in New Jersey that 

 the Iron occurs in true beds, though generally more local than the rock 

 strata. As an example, the "Hibernia" and adjacent mines might be 

 quoted, all of which work an ore bed along a length of two and a-half 

 miles, the ore and the rock walls pitching together. The ore has been 

 worked in the " Hibernia " mine down to six hundred feet, and at that 

 depth there is no sign of it giving out. The width of the ore varies from 

 4 feet to 25 feet, and the associated rock is chiefly Grey Gneiss. 



As a rule in this district Chrystalline Limestones appear generally 

 slightly above the horizon of the beds of Magnetite, near its contact with 

 the underlying Granulites; a few mines have been opened in the Chrystal- 

 line Limestone. 



The ore is often associated with Hornblendic and Micaceous Gneisses 

 on the hanging wall side, while the foot wall is composed of Grey Gneiss 

 or darker coloured Hornblendic and Micaceous Gneiss, and it occurs in 

 beds conformable to the wall rocks, consisting of pure Magnetite, or 

 mixed with Felspars, Quartz, Hornblend, Augite, Mica, Garnet, Calcite, 

 Pyrite, Apatite, and more rarely with other minerals. 



The usual strike is to the north-east, the '* pitch " of the ore shoots 

 generally north-east, and the dip of the ore bed is generally to the south- 

 east, but sometimes and less frequently, the dip is found in the contrary 

 direction. 



It has been found that as a rule the analyses of the new Jersey 

 magnetic iron ores give a greater amount of phosphorus than usually 

 occurs in the Magnetites of north-eastern Ontario, therefore, in many 

 cases the New Jersey ores are not suitable as Bessemer ores. For 

 example while some of the New Jersey ores give from 60 to 65% of iron 

 some of them give from 44 to 50% iron with from "06 to "5 and even to 

 i^ of phosphorus and from "06 up to 3'5% sulphur. The following, 

 taken from the New Jersey Geological Reports, might serye as examples 



Iron. Phosphorus. Sulphur. 



1. 48-00 ■ -47 rs 



2. 59-91 -066 3-5 



3. 64-00 



4. 50-00 



5. 6200 -44 -06 



6. 58 1-5 



