290 
[Assembly 
If the application of theory is admissible, it will bear us out in these 
views ; I refer to the theory of the origin of these veins, and to which 
I would invite the attention of the reader. 
SECTION XIX. 
Of the Vein, called the Coarse Grained Black Ore. 
This vein is situated in close proximity to the site .of the present 
works, in fact, the foundations of several of the buildings rest on this 
vein. It takes its name from the colour and coarse granular texture of 
the ore. Its texture throughout, is coarser than the Sandford ore. It 
is a hard ore or more tenacious ; still it is not the hard ore of miners, 
or one that works hard, and produces hard and brittle iron. 
SECTION XX. 
Purity of the Black Coarse Grained Ore. 
On this point, the same remarks might be repeated, which were 
made on the purity of the Sandford vein. The impurities, are inter- 
mixtures of the earthy minerals, as Hypersthene, Labradorite, and 
small masses of dark coloured Serpentine. In one or two instances, 
masses of sulphuret of iron, of the size of a butternut, have been seen. 
That no injurious substance exists in the ore, is fully shown by the 
quality of the iron produced from it. This is evidence of the best kind, 
and supersedes the necessity of making any farther remarks under this 
head. 
SECTION XXI. 
Extent of the Coarse Grained Black Ore. 
With our present knowledge, it is impossible to assign definite boun- 
daries to this vein. On a line measured east and west, and commenc- 
ing at the supposed eastern limit of the vein, and terminating at exca- 
vations near the western limit of the cleared fields on the west, it gives 
a width of more than 700 feet. By measurement, on a line running 
nearly north and south or in the direction of its strike, it is found to ex- 
tend 3,168 feet. The evidence of its vast extent, rests on the same data 
as those which were obtained of the Sandford vein, viz : excavations at 
numerous points. We did not proceed in a manner so systematic, as 
in the case just referred to ; and in the several examinations made, we 
found the ore passing more frequently beneath the common rock of the 
country. To a superficial observer, this great vein might be consider- 
