The Pamphlet Collection of Sir Robert Stout: Volume 2

III. Estimate of Quantity

III. Estimate of Quantity.

The ironstone being in many places of so open a structure that it would be useless to take the specific gravity of a number of samples with a view to finding that of the whole, I have assumed this to be 2.8; thus making a cubic foot weigh 175 lb.

In this estimate no ore lying outside the boundary-line is included, nor are the deposits at K and L.

Between the small hills F and G and the main hill is a small knob of about the same size as F, which is to all outward appearance solid hematite; in this, however, is an excavation, about eight feet in depth, exhibiting the following section:—
ft. in.
Ironstone with many quartz pebbles 1 6
Clay 6 6

This shows that the mass of the hill is clay, with merely a shell of hematite. From this fact I am doubtful as to whether this may not occur in a good many cases; but it could be proved only by boring.

Without this aid no accurate estimate of the quantity of hematite can be made.

I have, &c., (Signed)

George J. Binns, M.E.

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