Mohave County miner and our mineral wealth., 1921-03-25

when a poor fellow received his set clement sheet, although his ore was wonderfully valuable, he got only a small portion of the values.
 Since the days of the Mineral Park mill many other mills have been de- signed and erected in Mohave County, but until we looked over the mill at the c. O. D. mine, we have never been greatly impressed with their possibili- ty for ore saving. But looking over the new mill of the c. o. D. Mining Company we believe the acme of per lection in mill construction and sav- ing in the handling of complex ores has been achieved. To give the read CT some idea of the salient features of the mill and the method of handling the ores, we are giving number of views of the big plant, as well as views of the headframe, power house, blacksmith -and machine shops and other equipment on the property:
 To begin with there has not been the least doubt of the ore bearing abil- ity of the veins of the Cerbat range, but the manner of extracting the val ues from these ores has been one that has long puzzled the metailurgists' Recognizing these primary facts, M' R. Dudley took over the old c. 0. D. property for himself and associates and then proceeded to secure the best metallurgical ability possible to work out the flow sheet and to predecate the method of handling the ores or not only that property, but also the other mines of the Dudley promotions; w. w. Widdowson, who is recognized as a master in the handling of com plex ores, was delegated to work out about the installation of various de- the milling method and at once set vices in a laboratory at the mine to test out the ores from every angle. As result of these investigations the present milling plant has developed. To give the proper idea of its poten- tiality we will take the reader through the plant:
 The ore is carried from the big shaft and delivered into an auxiliary bin above the mill, whence it is delivered over a grizzly with spacings of IF, the fines passing back into the mill bin, the oversize going to a l0xlo Blake crusher, which crushes the ore to pass 1A inch ring, and then into the mill bin. From the mill bin the crushed ore is fed by plunger feeder to a set of 36 in. X 16 in. rolls, thence, it flows to No. 1 elevator, which ele- yates it to an impact screen of 2-mesh, the oversize being returned to the 36 inch 16 inch rolls, the undersize flowing to a 4-mesh impact screen, the oversize being delivered to a sec ond set of rolls 27 inch x IA inch, where it is reduced to pass the 4-mesh screen, the product flowing to the elevator which again takes it to the 4-mesh impact screen, the oversize from which is again returned to the rolls, the undersize going to another impact screen of 14-mesh. The ore which passes the 4-mesh screen and is retained on the 14mesh flows to a 2-cell James jig, where the coarse lead is concentrated off, the tailings flowing direct to 4x8 Colorado Iron Works rod mill, where it is crushed to pass the 14-mesh screen ,and again is delivered to No. elevator. It will be seen that the rod mill is working in a closed circuit with the rolls and jigs, and not until the ore is crushed to pass IA mesh screen can it escape from this circuit, excepting only the coarse lead, which is taken off by the jigs.