Rainbow Block Polymetallic Mining Project

planned

The Rainbow Block project is a brownfield polymetallic mining project located in the historic Butte silver-copper mining district in Montana. It hosts about 11.5 million tons of ore grading 4.28 silver oz. per ton, 0.05 oz. gold, 4.59% zinc, and 1.25% lead, with an inferred resource of 49.2 million ounces of silver, 550,000 ounces of gold, 1.05 billion pounds of zinc, and 287 million pounds of lead. The project includes thousands of kilometers of underground workings extending deeper than 1,200 meters below the surface.