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Gold Hill Mill DMO <br />September 2022 B-2 <br /> <br />The telluride belt is cut by a strong system of northwest-trending faults, locally called breccia reefs or <br />dikes, which exerted a significant influence on the distribution of the mineralized quartz veins. Three of <br />these northwest-trending breccia reefs, the Maxwell, Hoosier and Livingston, are nearly parallel, <br />spaced about 1.5 to 2.5 miles apart, and can be traced for 15 to 20 miles. Two other breccia reefs, the <br />Poorman and Fortune, have a more westerly trend and cut across the Maxwell to the Hoosier reefs. <br />The mineralized quartz veins of the telluride belt fill fault fissures are contemporaneous with and <br />younger than the faults themselves. Most of the historically productive veins strike northeast at almost <br />right angles to the reefs and dip steeply to the northwest. They can be traced on the surface for more <br />than half a mile, and average between one to five feet wide. <br />Although the Boulder County telluride deposits are widely scattered over a broad northeast trending <br />belt, most of the production has come from a few highly concentrated centers which exhibit a strong <br />structural control. The largest and most productive precious metal mining district in the Boulder County <br />telluride belt is the Gold Hill Mining District which comprises about 12 square miles and contains most <br />of the important mines. One of the most productive centers of mineralization in the Gold Hill District is <br />located near the town of Gold Hill, within an area of about four square miles. This area has produced <br />more gold and silver than any other productive center of similar size in the district or the telluride belt. It <br />encompasses the area between Left Hand Creek on the north and the village of Summerville on the <br />south, and includes the important Slide, Prussian, Klondike, Cold Spring, Red Cloud, Gold Ring, <br />Alamakee, Horsfal, Columbus, St. Joe, Parallel, White Cloud, Cash, Freiberg, Who Do, Black Cloud, <br />Victoria and Rex veins.