Gilpin County Gold Mining “BOSTON & COLORADO SMELTER BLACK HAWK, COLORADO TERRITORY Duhem stereoview photograph 1866” has been added to your cart. View cart Showing the single result Sort by popularity Sort by latest Sort by price: low to high Sort by price: high to low Add to cart BOSTON & COLORADO SMELTER BLACK HAWK, COLORADO TERRITORY Duhem stereoview photograph 1866 $250.00