Show THE alssen ISSEN STAMP MI MILL L L PETER N NISSEN IN LOS ANGELES MINING REVIEW the largest stamp mill in the world is to be built at garfield utah by the boston consolidated mining company for the milling and concentrating of ores from its great low grade copper mines at bingham after very severe tests conducted over a period of six months by mr A J bettles metallurgical engineer for the boston consolidated soli dated company the contract was awarded to fairbanks morse and company for installation of nissen independent stamps with a provision in the contract that further stamps shall be added after completion of the first installation by the tests it was conclusively proven that on the ore to be treated which is a quartzite of medium hardness the nissen stamp has a capacity of ten and three fourths tons per twenty four hours through a 28 mesh screen the daily capacity of the finished plant may therefore be fairly estimated at tons which will be much in excess of the capacity of any existing stamp mill the tests were conducted with the greatest fairness competing mills including besides the nissen stamp standard batteries rolls and various circular mills were run on the same ore so that there could be no error in comparing results obtained under different conditions mr bettles problem was to reduce to 28 mesh copper ores aver aging one and one half per cent and to get betl the best possible product for concentration s at the least possible cost W without phout wish wishing to go into comparisons I 1 may say thattie th atthe fact as demonstrated during the test that the nissen mill made ten per cent less slimes than any competing mill had much weight in the final choice 1 in the nissen mill there have been re bained the well proven principles of the gray grav ity stamp the new feature being parti particular culan ly in the use of the circular inde independent pende nt mortar to increase discharge facilities of the stamp thereby increasing its capacity as much as 10 per cent in proportion to the horse power required for its operation the cross section of our mortar is quite j similar to that of the modern five stamp crushing mortar and the screen is relatively the same distance from the stamp in its hor points owing to the fact that the area is so great and also that the screen is in a position to receive the impact of PW PUP against it at right angles always a veraun form crushing is accomplished without ex mortar Is s cess wear on the screens the wa 1 n 9 effectively protected from wear by a that is cast in one piece and held in such a manner that it causes no trouble by loose the feeder employed with bac each h of these th Cli analie allege 8 most improved stamps is of the ype designed to work very easily so that I 1 constant attention is ig not required to keep ho he nuts and pins from becoming loose iso ilso by feeding this stamp independently aery ry steady and regular operation is in peter norman nissen so that the shoe and die wear much more evenly than in other typed of mortars and allow closer feed As to material used the cam shafts and stems are of hammered steel the shoes and dies are of forged steel the cams and tappets are of cast steel A camshaft cam shaft bearing is placed on each ada to the direction of the splash in avoidance of slimes because for the reasons above cited there is less re grinding than in other types economy in power chiefly for the same reasons the effort has been to provide means to relieve the mill promptly ani and as thoroughly as possible of pulp fine enough to pass the screen in use and although in the course of ten years of experiment certain minor advantages have been developed the feature mentioned is the I 1 main n ain issue and to it the success of this type of mill is due in operation the nissen mill is similar to the standard battery save that each stamp is independent and is larger weighing pounds a and nd the shoe of ten inches diameter that there is an independent mortar for each stamp and that the screens are semicircular semi circular for each unit from one to six stamps may be operated by the same cam camshaft shaft and any stamp in the battery may be hung up for any purpose without interfering with continued operation of the other stamps these are the main po points ants of excellence of the system we believe that we have retained re every good point of the standard battery while providing a more scientific mathematically correct and rapid method of discharge for the crushing quantities of very low grade ore mr bettles felt obliged to devise if possible new economies in treatment and handling to this end all of the most likely forms of ore dressing machinery were tried out thoroughly and their various qualities both good and bad carefully weighed in and in groups of four and six in mexico arizona california and nevada and for periods ranging up to two years these have been very successful in operation both as to cost maintenance and percentages saved george herman nissen in 1905 fairbanks morse co entered into an arrangement with us whereby they became sole manufacturers and selling agents for the mill under our patents in the united states and mexico they have sold several plants of good capacity since the first of the year we are about to in f aj aj plan of a six stamp nissen mill af every cam which goes far to do away with danger of breakage f briefly the advantages and economies of lis Is type of stamp lie in ready and positive Jp owing to increased screen sur pice ce every part of which is at right angles comparison the selection of the nissen anissea type under such conditions may be consid considered as remarkable testimony to its suitability for the purpose in view there have been up to the present time some forty of these stamps in use singly 9 1 stall plants in idaho oregon and montana besides several in mexico and the southwest and the great plant at garfield mr bettles has during his experiments kept comparative figures which will be carefully checked and tabulated these will be given out for publication as soon as prepared he has also devised certain economies in handling which are important full particulars of which will also be given the mining review these mills have heretofore been manufactured in los angeles it is probable that from now on and for a considerable time they will be largely manufactured in the east ease also though I 1 believe facilities here are ara to be at once greatly increased mr nell neil M macdonald head of the mining department of fairbanks morse co has persistently followed up this matter and it is largely due to his energy that the contract for the garfield plant was se curea george and peter nissen mr george herman nissen was born in farsund norway in 1833 and came to this country when twenty five years of age he was one of the pioneers of colorado and soon became identified with the milling and reduction of ores he built the first smelter in colorado the lyon and plant at blackhawk later he went to nova scotia where here he designed and built some of the largest quartz milling plants of the time as also in georgia north carolina and ontario about ten years ago the first drawings for the nissen mill were made in ontario after his design since which time he has devoted himself largely to its perfection mr nissen came to los angeles in 1903 and has made his home here his services to his particular branch of the mining industry have been distinguished and have been re recognized co by the award of a silver medal at the exposition which was at that time the highest award as no gold medals were viere given his younger son mr J M nissen is now engaged in erecting a mill for the lacy manufacturing company in mexico mr peter norman nissen who has carried on his fathers work to completion is president of the nissen engineering company of this city which owns the var various patents covering the nissen stamp mill he has devoted his entire active life to the study and perfection of milling processes born in new york in 1871 he graduated at trinity college in north carolina and later at queens college ontario canada his early training was gained in the gold re detail of nissen mill gion of north carolina where are sent many new ore reducing devices for trial in nova scotia and ontario mr nissen filled several important positions both for companies and for the canadian government he designed and installed the government milling millin plant at the school of mines the plant of the grace mine a famous property which he discovered and developed and many others later he went lent to ardizoni on mining business and in 1904 he came to los angeles to live he is a member of the american am alcan institute of mining engineers Engineer sand and an expert 0 on n milling practice |