*The Census Report of 1870 contains the following additional arrastras in this county: The Cersus Report contains the mill of the Delphi Mining Company, with ten stamps, driven by steam power, and that of the Kern River Mining Company, with sixteen stamps and one crusher, also moved by steam, neither of which I can identify in the above list. Grass Valley.. Grass Valley. Grass Valley. Metallurgical Works 1865 Frank Morse. Eureka Mining Co. According to the census A. C. Mack's mill, with five stamps and one arrastra, (silver,) and H. W. Walker's, with two arrastras, (gold,) are also in this county; in the same report Williams's is a five-stamp mill. In the above list the mills of the Idaho Company, at Grass Valley, containing fifteen stamps, and that of the Greenhorn Company, eight stamps, appear to be omitted. They may, however, be recorded under different names. Cement mills. § Not completed. H. Ex. 10 -30 Water. 8,000..do 1864 8 Steam. 8,000..do ..do 3,000..do ..do ..do 3,000 do ..do 3,000..do 465 * According to the census report the Golden Rule Mill contains fifteen, and the App Mill ten stamps. 1864 10 1 S. & W. 1865 5.. Water. 10, 000 Gold 5,000 do ..do 10,000..do 1858 10 2..do 3,000..do Steam. 7,000..do 1869 30 3'..do 40,000..do .do 8,000..do Water. Water. ..do ..do 15,000..do 10,000..do ..do |