14 



E. J. CHAPMAN ON IRON OEKS OF ONTARIO. 



to deposits iu which uo trace of titauiiim can be detected, is a fact of much interest, 

 hitherto apparently unrecognized iu the iron districts of Europe. 



III. — ^Hematites. 



No. 1. This ore, as regards its locality, lies just beyond the area to which the present 

 communication is essentially confined. It occurs near the village of Tamworth, in Shef- 

 field township, Addington County, where it has been mined to some extent ; but the 

 sample was sent to me for analysis, and I have no authentic information as to the condi- 

 tions of occurrence and probable quantity of the ore. The sample consisted of red, semi- 

 crystalline hematite of very good quality, holding 64"12 per cent, metallic iron. 



No. 2. This is an exceedingly pure and rich hematite of a steel-grey colour, more or 

 less compact structure, and dull-red streak, from lot 13, concession 10, township of Marmora, 

 where it is known as the Bentlif ore. Small exposures shew over the west half of the lot 

 generally, but the ground, as yet, is entirely undeveloped. Metallic iron, 69'35 per cent., 

 with rock-matter (silica) under 1 per cent. 



No. 3. Red iron ore from the Wallbridge Mine, lot 12, concession 5, township of Madoc. 

 The sample was taken, some time ago, from near the central portion of the large " stock " 

 or ore-mass of which the deposit consisted. As shewn by the analysis, the ore from the 

 deposit generally was of exceedingly good quality, holding very little rock-matter, and an 

 average of 60 to 66 per cent, metal. But the deposit, after yielding a very large amount of 

 good ore, is nearly worked out ; and the ore is passing into ferruginous rock around 

 the entire limits of the deposit.' 



Nos. 4 and 5. Samples of poor ore from the shaft and drift of the so-called Miller 

 Mine, forming an extension, to the east, of the Wallbridge deposit. These samples, taken 

 from a depth of about 60 feet from the surface, near the extreme easterly limit of the ore 

 stock, shew conclusively the exhausted condition of the latter. At the Wallbridge Mine, 

 proper, the ore has been taken out by open quarrying. The large excavation, which has 

 thus resulted, averages 1*70 feet in length by 100 feet in breadth, with a depth of about 

 80 feet. An exhaustion, like that shewn by this mine, must necessarily follow, sooner or 

 or later, the working of all stock-formed deposits, although many may hold out and yield 

 a large supply of ore for years. 



' The mine is now (October, 1885) entirely exhausted and abandoned. See a comninnicalion by the writer 

 in the present volume of Transactions, Section IV. 



