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These lands of decomposed mica and talcose schists contain throughout their broad extent particles of gold; and some of the narrow and circumscribed fields are unsurpassed in their undeveloped richness by any of the known gold fields of similar extent in the world.

The talcose variety is very tabular in form.

Microscopically, it consists of minute irregular-shaped particles of a mineral that appears to be the result of a chloritic or talcose alteration of a felspar.

In contact with the greenstone, there is a bed of talcose limestone, having a curved, slaty structure; most of the beds of dolomite are hard, and pass into chert.

Thus feldspar, on being pulverized, yields potash; talcose slate yields magnesia; marls yield lime, etc.