Show THE MILL tonopah To nev miner the final patent papers have just been issued from the washington patent office covering the design originated by L L of manhattan nevada to eliminate that stage in mill practice which takes in the mill stamps rolls etc mr iett while in charge of the big pine mine and mill operations conceived the idea of placing a partition in an ordinary tube mill and the coarse crusher product which in ordinary mill practice would pass under stamps or through rolls for a manry coarse sizing before reaching the fine grinding stage of a pebble tube mill was to receive its grinding through iron ball action in the first chamber of the tube mill and from there to pass automatically into the major interior portion of the tube mill where the final fine grinding action was imparted to the product by means of pebbles the same as in ordinary tube mill practice after devoting several months to perfecting his process and experimenting with sizes of iron balls types of liners etc for the small chamber the perfected mill was placed in steady operation at the big pine and demonstrated an unqualified success it has been in use for over two years and the results obtained are sufficient to revolutionize ordinary mill practice the product from the combined mill showed sizing tests identical with an ordinary tube mill and the elimination of the stamps from the mill reduced the cost of treatment by over one half the partition is designed with two separate heads with space between where a spiral scoop is placed to elevate the pu pulp ip from the lower level in the ball mill to the center of the pebble compartment where a higher pulp level is necessarily maintained thus giving the same effect that would be given by the installation of an open end ball mill followed by a re grinding pebble mill but doing away with tho great increase in cost of a double installation and double operating cost the manufacture of fhe perfected mill parts has been undertaken by a tonopah company although tile the for these improved mills will be so great after their good qualities become known that arrangements undoubtedly will he be made in the near i future for manufacture where a larger sup j ply can be turned out the local company formed to supply j these patented mills is known as the A amen merl can combination dall ball pebble mill COni company panY 1 |