In the Interstate Mine the attitude of bedding planes in the wall rock has influenced fracturing in two ways: (1) by presenting beds to the plane of movement in such a way that they must tear rather than bend, (2) in combination with other planes of weakness, by inducing the fractures to curve in order to take advantage of planes of easy failure. Parts of the vein system in which the attitude of bedding has been conducive to one or the other of these conditions have been brecciated and replaced by ore.

First Page Preview

First page PDF preview
You do not currently have access to this article.