CALIFORNIA GOLD MINING & GOLD RUSH DISTRICT. Original 1914-1915 Mining Company for Union Hill Ming Company - Union Hill Mines of Nevada County, California. Union Hill / Grass Valley, California: 1914-1915. Original hardcover ledger 11.5” x 8”, bound in half leather with gilt stamping over light brown corduroy, metal spine with locking mechanism (no key), marbled paper pastedowns, and gilt embossed leather alphabet tabs on front page edges. 168 pages of handwritten text showing detailed internal records from the historic Union Hill Mining Company that had offices in both Grass Valley and San Francisco. Union Hill is adjacent to Grass Valley. Detailed information for 1914-1915 including operating expenses, profit and loss, income, expenses, production, vendors, payroll, cash, bullion production, tungsten production, names, vouchers, insurance, and marketing. Entries include operating expenses for the South Idaho Mine, and names of the local companies they did business with such as Grass Valley Hardware, Empire Mining Company, Nevada County Narrow Gauge R. R. Company, and Thomas Diggs Company, an entry for Augustus D. Cox who was the Mine supervisor, to very specific mining operating expenses for example: “Shaft Above 600’ Level”, “Shaft Below 600’ Level”, “Storage Dam 600’ Level” with expenses for mining tools, hoisting, compressing, fire protection, etc. A rare and unique Gold Country artifact, this original handwritten Ledger offers compelling insight into an historic Mother Lode gold mine. The corduroy covers have some staining, the rear leather corner has a corner chip, the rear spine fold has a two inch half oval chip revealing the board beneath, the front hinge is split and the metal spine has some rust, internally, the ink stamp of the Union Hill Mining Company on the front endpaper. Gold was discovered at Union Hill in 1854, the first recorded claim was in 1866 as Union Hill Gold Quartz Mine, and Mining Stock Certificates for Union Hill Mining Company exist from the 1860’s. Although very profitable, it appears Union Hill Mine opened & closed, changed ownership &/or operators several times from the 1870’s until purchased by Idaho-Maryland Mines Company around 1920. In 2016 this historic mine was purchased by a gold mining company with plans to restart operations in the unexplored areas below the Idaho-Maryland Mine Property.