| Show ube mines aab mills of me be lamar bamar lRe ie k i wk ga special correspondence S sa F mining and scientific press 61 g HAT mav may be called the de lamar district takes in an area of about fifteen miles east and west by twenty miles north df and south wherein the local records show there are nearly 1300 mining locations the first having been made in 1891 the de lamar group extends across what is locally known ay as lookout mountain covering a great reat quart zite lode which trends nearly north and south the pro property p is opened through a series of tunnels cutti cutting ncr into the mountain one above another following the strike of the mineral zone northward the formation is a quartzite being about 80 per cent silica an and is somewhat broken by porphyry dykes cutting diagonally 15 through the otherwise regular quartzite strata while the mineralized shoots are referred to as veins and ledges there seems to be an absence of distinct walls or vein matter distinguishable from the regular formation jo to illustrate this it may be cited that experienced miners employed in the mine are unable a as a rule to discriminate between ores of high grade and those carrying marks the strike of the mineral deposition is the existence of a north and south fissure filled throughout by a decomposed material consisting mostly of clay and tale talc but which carries no values to speak of this locally knoon as the great gouge is traceable for several miles and is known to wave wave and wind considerably while keeping the same general course the quartzite formation through which it passes has been impregnated with gold to a varying extent in a great areat open out cut half way up the mountain side on the de lamar group the character of this gouge 11 is readily observed the lower tunnel known the mountain from the tenth to the fifth is an electrically operated skip used solely for a manway A rock walled chute passes from the higher levels to the tenth connecting with which all the ore is sent to the tenth level there loaded into cars and crammed to the mill the mine timbers are unloaded and framed at tunnel no 5 and distributed by gravity to the below the ore is dout out in immense chambers many of which are from 40 to feet wide and 80 to 00 met feet long well ti timbered up in square sets and as the work proceeds upward the space between sets is filled with waste r r 71 W n 11 W R 1 1 J 52 Z vr Z TA DE LAMAR MINES DE LAMAR NEVADA APRIL FOOL MINES no values but it se seems seema ems tobe to be a case in which a great zone one of the country rock has been mineralized by infiltration of g boldin i oldin solution A distin distinguish aish ing feature of the property and one that as no 10 is ia on a level with the crushing ciu cru shing shino floor of the mill and advances northward iver over 2 2000 feet above it area are similar tunnels about feet apart almost to the summit of 5 goes croes on level to levei and horizontally on each level in the course of which are seen some excellent specimens of mine tim timbering berino an illustration of the system employed is seen by the general superintendents superintendent s mine chart on which is recorded the assay value of the ore from every block or square set on any level or in the mine mine prom from forty to fiat fifty y assays essays are made each day from ores collected by bv the sampler from which the daily record is made up As is crene generally nilly known the mill is a cyanide reduction plant in which the ores pass through a coarse c rusher crusher thence thi through our h griffin mills of which there are thirteen in number and by which the material is ground to from 60 to 80 itis it is carried by conveyors elevators to the pulp tanks and leaching vats CONTINUED ON PAGE EIGHT 1 I THE MINES AND MILLS OF DE LAMAR NEVADA CONTINUED FROM PAGE FIVE the infinitesimally ally fine dust particles are blown into five collectors caught in the col there is a pumping Lr station aaion st in forcing the water from the station to the mine and mill a i lift of 1700 feet is made the entire operations of mine and mill and accessories are under the general o beneral superintendence of F P swindler wm win oxnam being mine superintendent and louis gross mill superintendent the april L 11 apol 1 3 Z ty lies east cast wet I 1 k of the de la lamar mar on the same hill its ibs rip workings running almost parallel to those of the latter A the april na fool belongs s to bulte B u t t e parties and is in charge of superintend e n t J healey in this mine is a regular re ular vein between well VIEW OF DE LAMAR MILL DE LAMAR NEVADA d e fl fi n e d lector stockings from which the air escapes walls the ores comprise a quartz bearing and the dust is thrown down to a conveyor considerable free gold old but otherwise quite which carries it to the cars and thence to the similar to those in the de lamar the development deachin leaching tanks the dust thus saved contains here is by tunnels which penetrate a high percentage of value the mill along the strike of the vein from the upper crushes about tons of ore per day the tunnel the lowest one is a vertical distance of leach leaching in tank capacity is OOOO tons per month about and about tons of material are constantly in course of treatment through the mill two large vacuum tanks serve their purpose in drawing the liquid from the leac leaching liing tanks to the precipitating room w where here zinc dust is used instead of zinc zi n c shavings the equipment for reducing the auro c kanides cyanides to bullion is quite complete and once a month the gold rold bars are in a bur burglarproof burglar lar proof safe afe to salt lake city the power plant consists conss ats ts of five boilers a H P mill anrine engine with high and low pressure c cylinders inders 22 and 34 inch diameter respectively with 48 inch stroke a crusher engine inches a inch dynamo engine which operates a GO 60 K W oo volt dynamo dy naino kv by which the mine hoist and stationary motors are operated besides there is a seven drill compressor and power for a well equipped machine shop As a matter of economy econ orny the exhaust steam from the engines is condensed and used to heat the boiler water in a green economizer the latter cleansing the water and precipitating the lime and other matter in solution the water then passing to the boilers at to degrees F where no boiler compounds are used A force of men is employed in the mine and about sixty men at the mill and shops the sources of the water supply arp are various wells and springs in meadow valley wash sixteen miles east of de lamar where feet these tunnels extend from 2000 to feet and are connected c 0 n n e c ted 1 by y chutes and dinzes from a point 2000 feet from the lower t u n nel entrance a sh shaft aft is be ing incy sunk a ig S a solin e hoist being in use at the collar of shaft the vein swells to a great width in some places and pinches gates crusher ten stamps dropping ninety V per minute double discharge t with front ar and rear plates effecting a saving of froin 20 per cent to 40 per cent of the values by amalgamation 1 the tailings are carried by sluices to the cyanide leaching tanks of which there are eight with two solution tanks about tons are in course of passi sin nir through the plant it is stated t tn ten n additional stamps are to be put in thel the mono april fool no 2 interested interest e d in ill which are george C fetterman of de lamat lamar and frank knox of salt lake cit city Y end lines with the april apri I 1 fool proper and is in course of development having about 1200 tunnel P work the vein is said to have been encountered showing ore that assays essays well the gold eagle belon belonging ang to nesbitt hin hing comprises two claims has several hundred feet of development on the vein said to be a continuation of that of the april fool recent assays essays showed values of over 80 gold and ounces silver to the ton the property is bonded to sanford and others for time limit being may 20 1900 the magnolia north of the de lamar has considerable of development and has made some shipments T R jones and others are interested in the group the little emma and hunter claims four miles north of town belonging to roeder boeder conway thompson has also been considerably developed disclosing a fair showing of ore carrying gold silver lead and copper the lie hercules relles group belonging to IV A maynard is well located and his has good surface sho showings winos the sunbeam a north extension of the ai 1 X i f 1 1 ai N Z SECTION OF ENGINE ROOM DE LAM AR MILL DE LAMAR NEVADA in others it dips about 10 degrees from the vertical A pay streak from one foot to four feet wide is noticeable in the gangue rock the underground work aggregates four to five miles in timbering the stull system is used the april fool mill im ia equipped with de lamar is owned by dooley iseman Ise roan c donough and has a 11 good showing in surface development the flagstaff group owned by a stock company in which the de lamar company have control is developed ky by a foot tunnel and other work |
