Young associated himself with the
Derby Mine, which was originally located on January 1, 1900, by located by Silas P. Hill and J.C. Forrest, and the Derby Mining Company in the
Thumb Butte Mining District. The promotions of the Derby Mining Company stock took place between the Copper Basin and Mint Valley Mining Districts in the
Sierra Prieta Range
Yavapai County west of
Prescott. There is a rich history of prospects, mining activity and the promotion of mining claims by Young. During the late 1800s and early 1900s, lode mining claims were located by prospectors who, like Young, identified these claims under both the 1866 Mining Act, and The General Mining Act of 1872. Regularly used by Young in his promotions of this popular field was his office letterhead, which read: 'Stocks, Bonds, Lands, Investments; Land and Irrigation Projects Examined;
Mine Reports a Specialty. George U. Young acted as president, general manager and lessee of the
Derby Mining Company in about 1902 and vice president and power of attorney of the later
Madizelle Mining Company (1908), offering capital stock in both companies. Certificates were primarily issued through brokers, to investors on the east coast. Young's cattle ranching prospects for the Derby lands were as just as much a part of the ground as his mining promotions. Both were well known throughout the Thumb Butte District, where present day
Highland Park is centered. a U.S. Deputy Mineral Surveyor. This effort resulted in the 'Plat of the (Mining) Claim of George U. Young, which was incorporated into land patent documents to the Madizelle Mining Company.[3] Official records indicate the mineral plat represents twenty five lode mining claims situated in the Thumb Butte Mining District: Puritan, Puritan No. 2, Puritan No. 3, Iron Mask, Derby, Derby No. 2, Derby No. 3, Ellen No. 1, Ellen No. 2, Madizelle, Huguenot, Patsy, Humbert, Italian, Happy Strike, Sunny Side No. 1, Sunny Side, Surenough, Penos Alto No. 1, Penos Alto No. 2, Penos Alto no. 3, Highland, Knocker Doom, Protection No.2 and Protection #3. George U. Young filed many types of lode mining claim location notices for claims throughout the Thumb Butte Mining District. One of his first mineral discoveries was aptly named the
Accidental. George U. Young was a well known promoter in the Territory, publicly promoting himself, as well as his related mining ventures since the 1890s. In 1912, Geo. U. Young sat as a director on the Phoenix Real Estate Board, which like the Madizelle Mining Company, also operated from the building block at 403-404 Fleming in downtown Phoenix, present site of the Wells Fargo tower. Regularly used by Young was his office letterhead, which read: 'Stocks, Bonds, Lands, Investments; Land and Irrigation Projects Examined; Mine Reports a Specialty.' Young's mining ventures were well known throughout the Thumb Butte District, where present day Highland Park is centered. Young is also associated with several other lode mining claim location notices, for claims throughout the Highland Park area. One of his first locations is known as the 'Accidental' Lode Mining Claim. Additional lode mining claims situated in the Thumb Butte Mining District are the Isabella, Big Ben No. 1, Big Ben No. 2, Ellen M., Iona, Great Eastern, Last Chance (J.J. Fisher), Star, Lowry Hill, Lowry Cross, Ohio, Norman, Summit, Edgar, Alto, and Protection. otherwise known as
Sierra Prieta on the
Santa Fe, Prescott and Phoenix Railway. This was the main delivery system for the hauling of heavy equipment to the mining activity in the area. ==Politics==