Abstract:The Rainbow Lake Wilderness Area contains a low-grade identified resource of copper in thin sedimentary beds that are no more than 1.5 feet thick and that contain grades no higher than 0.5 percent. The beds are restricted to a single stratigraphic horizon, dip 5° to 30° N., and are present only at great depth in much of the area. The area also contains about 210,000 short tons of commercial-quality peat and a great amount of sand and gravel (fig. 1). An abundance of similar material in the region closer to tra… Show more
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