The Alaska citizen., 1910-11-07

where all but the very finest shines will be saved The overflow from this trough flows 10 a whole current settling tank. the discharge from which will be clear water. IL will be practically impossible for any concentrates to escape. The tailings from the tables go into a tailings launder which discharges into the mill tail race. If it is found that the tailings still carry values over a few cents they will be impounded and saved for future treatment. pos sibly by some method of cyaniding
 The mill can at any time be con- verted to concentrating mill, if any concentrating ores should be of fered. Stamps are used to a large extent for crushing concentrating ore. notably in the large new mill of the Boston Consolidated Mining company. of Bingham, Utah, which is handling the experiencing Utah porphyry
 A thorough sampling will be done at frequent intervals, both tailings, and concentrates being sampled and aSsayed at least once every shift If the assays do not show a satis- factory recovery the treatment will be changed until the best results are obtained.
 DeiSter concentrators are used there being two large slime tables and one sand table. These are the best Concentrators at present ob- tainable. In the new mill of the Gold fields Consolidated Mining Company at Goldfeld. New, Deister :abies are used exclusively. Th's Is a one-hun- dred stamp mill. completed in 1908 at cost of s4O0,0O0 The Deister tables were decided on after long series of competitive tests with tables of other makes. In Competi- tion with the Vanner the per cent extraction by concentrates on the Deister table was 4l91 per cent. while on the Vanner 1t was 32.32 per ! cent The Baltic Mining company of Baltic, Mich, put in Deister tahle to run in competition with other tables on their copper ores The Deister table reduced the cop per content of the tailings one-tenth of one per cent. making higher saving and cleaner concentrates than the other tables used The Cham Dion Copper Company, Plains dale. Mich. recently added an extension 10 their mill in which they used Deister tables exclusively Deister table was last year in stalled in the Mexican mill at Tread well.
 l The Cinema mill has a thoroughly equipped laboratory with all the nec- 1 essary apparatus for experimental ' nry. lo.@ ,l d., , of treatment of any ores that may ! be offered. MT. Cunningham expects 1 to be able to treat all the concen- ] trates which are likely to be ob- i tained from the oxidized surface ore
 which is al present being offered. i It Is impressed on the miners by Mir. Cunningham that there will be 1 no occasion for them to be discour- aged if they should strike base ore 1 Their proper procedure will be to l send the ore into the mill and 1t will 1 he handled there for them even if 1t i is necessary to install a cyaniding, i chloridizing or any other type of plant. When the sulphide ore is reached the best method of treating 1 it will be determined and the plant
 extended accordingly.
 ] The water supply Is drawn from
 a we'll In the building itself. from
 which it Is pumped to a tank above
 the battery floor. The water is heat ed in this tank by means of coils 1 of steam pipe. The building Is thor
 oughly heated throughout with the
 exhaust steam from the two engines and there Is absolutely no danger of
 the mill being obliged to shut down 1 on account of cold weather
 1 Two boilers. each of 45 horsepower
 have been installed. Only one of
 these boilers will be used at time,
 the second one being kept ready to fire up in case 1t should be neces-
 sary to shut down the one in use 1 The jaw crusher and the ten one
 thousand-pound stamps are driven by a 40-horsepower, center crank Frost
 engine. The concentrators and the
 pumps are driven by a fve-horse
 power vertical high-speed engine
 This engine also drives the small
 machines in the sampling room and
 height of eight inches, one hun
 dred times minute The dies,
 shoes. heads. tappets and cams are
 all of the best manganese steel. The
 cams are attached to the cam shaft
 by Canda wedges. The six foot
 wood pulley which drives the cam shaft Is attached by means of a
 Blanton wedge.
 The cleanup room Is equipped with
 cleanup barrel and retort and all the
 necessary apparatus for cleaning and
 retorting the amalgam. The retorted gold will be melted. sampled and
 assayed and shipped as bullion.
 The mill is housed in a three. story building. The stamp founda-
 tions and mill framing are indepen- dent of the building, so that no jar is transmitted to the building itself. Tie battery floor is 26x30. The concentrator floor is 22x4S. and the
 boiler room and work shop occupy a space Of P by 30.
 At present the ore Is raised to
 the grizzly from the cars by means
 of self dumping bucket hoist, but
 the railroad Is considering putting
 in a spur to the top of the mill bin
 in the spring. and the ore would
 then be dumped direct from the
 car on to the grizzly
 The mill has been built so that
 extensions can be made at any time
 The boilers and engines have all
 been installed with this in view and
 a cyanide plant could be installed
 at any time without any additional
 power being necessary.
 The mill has been erected under