.	Dwarves' Earth Treasures Online Museum: Montreal River Datolites Mines along the Montreal River, Keweenaw CO., Michigan	.

    There are several mines along the Montreal River such as Montreal, Cape, Prospect, and Star Mines and like Clark Mine, they were opened in 1850s and did not produce sufficient supply of copper. But datolites have been found from the overgrown piles of those old mines. Most datolites are white to opaque green (sometimes yellow), sometimes with copper inclusions.

Cape Mine	Cape Mine	Montreal Mine,
Montreal River,	Montreal River,	Very unusual coloring pattern, may be actually from Empire Mine
Montreal River	Montreal River	Yellow with a film of copper

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