San Juan County Colorado mining stock certificate View cart “SUNNYSIDE EXTENSION MINING & MILLING COMPANY San Juan County Colorado mining stock certificate 1904” has been added to your 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 cartSUNNYSIDE EXTENSION MINING & MILLING COMPANY San Juan County Colorado mining stock certificate 1904 $175.00