Show MANHATTAN NOTES P MANHATTAN CHAMBER OF MINES manhattan nev may 28 about three months ago the working shaft on the white caps was continued down from the to the foot level the high grade of ore which has been mined from the surface to the level and which has produced so much rich ore was encountered about 45 feet west from the shaft and raises were put up on the ore to connect with the level above from between levels there has been shipped nine car loads of ore to the western ore purchasing company the value of the shipments ranging from 45 to 85 per ton A very large tonnage of ore from 15 to 35 in value per ton has been demonstrated from the foot level As this ore is refractory in cha character facter a mill ore pile is being started by the management instead of shipping to local mills later on either a roaster will be installed tests haying proven that a slight roast liberates the content of the ore to such an extent that a ninety per cent extraction can be made by straight amalgamation or else a different process will be evolved other than a straight cyanide process tests are now being carried on in several places to prove the value of the new process for the treatment of base ores shortly it will be determined which process will be the best for the white caps drifting to the west and south from the about feet from the shaft the west ore shoot was struck and already the ore has been proven for a distance of 60 feet and in three places high grade streaks were encountered at the present time the east drift is being extended to connect with the east ore body at a probable distance of feet from the bottom of the shaft this east ore body in the upper levels is of immense size being in places 45 and 50 feet between its walls and being about feet in length when this east ore body is opened up from the bottom level the white caps will have three separate ore bodies to work on any one of which would suffice in most districts to classify the white caps as a mine the ore production of the white caps for the past two years is tons gold values in same the main ore body in the manhattan consolidated as depth was obtained in its development proves to be base and not susceptible to the ordinary cyanide treat treatment in the local mills A series of tests has proven the same as the white caps that a sil slight wit roast liberates the refractory frac tory elements and makes the ore free milling the consolidated the white caps find and the associated milling company are awaiting the results of tests now being earned carried on in california by a process part chemical and part electrical it is claf claimed thed that without the preliminary roast a satisfactory is factory extraction can be made the kendall lease on a portion of the consolidated soli dated estate has just completed a mill run of tons of ore which produced a gold brick of besides the values treated in the mills cyanide department settlement was made on a valuation of 47 per ton for the milling the ore was taken from a sunk 50 feet below the foot level in the kendall workings the values are still being found in the ore body as exposed in this and shortly will be commenced on the ore the brady lease on the earl is now milling ore from the west ore shoot from the foot level and also from the extension of the kendall vein opened up feet east from the earl shaft the working shaft of the principal lease block of the litigation 0 hill merger is down feet on an incline the lease being on the eastern end of union no 2 claim the value of the total production of ore from this block is over there are three sets of lessees lessels at work on parts of the colm company pany estate for more than a year the toro blanco has been persistently developed both by company work and by lessees lessels les sees the company work has produced a working shaft shaf t over feet deep well equipped with hoisting plant electric pump blacksmith shop etc the lessees lessels les sees development while on a small scale has resulted in several hundred feet of drifting and crosscutting cross cutting in the northern end of the estate and has exposed the mother lode in that section the company shaft has penetrated penetrate d the cap shale and is now well down in the true ore zone at a depth of feet present I 1 operations are confined to driving a north drift on the ore and further sinking 21 of the shaft of the ore will be deferred until both these operations have been extended to fifty feet further the lessees lessels are still sinking a on the downward extension of their ore shoot A shipment to the mill will shortly be made the ore when first struck averaged 20 per ton but the values have increased with development until now the average is nearer 40 leasers leaders are at work in three places on the seyler humphrey several small millings 11 have been made and a good grade of mill ore has been developed the gillan gillaim cornell lease on a portion of union no 4 claim recently shipped seven and one half tons tolls 0 of f ore to the mill which 1 averaged 72 87 per ton other lessees lessels are prospecting on various portions of the large company holdings the manhattan amalgamated has been operated by the company both in the liberty fraction through an incline shaft feet deep and also in the granny workings through a vertical shaft feet deep while no ore has yet been demonstrated from the granny shaft a west drift from the foot level exten extended deli feet has exposed a change in the formation and a ledge which shows on the surface should be close to the face of the drift the big four mine continues to turn out sufficient tonnage to keep the ton mill dropping its stamps to capacity A total of about tons has already been milled the mill has been operating on ore previously developed and broken in the mine A new hp double drum hoist has been installed and the new head frame for the shaft has just been raised the new hoist will furni furnish ample power to sink the shaft to the 1000 foot level the mill has demonstrated great efficiency tile the extraction being 90 per cent and the mill operating costs less than 80 cents per ton As it is proven that one tube mill can handle the product from the ten stamps it is probable that in the near future another unit of ten stamps will be installed bringing the milling capacity up to tons per day ore representing three years milling is in sight in various places in the mine the total operating costs mine and mill for the past month have been per ton this sets a record for cheap operation the reilly fraction lease of the man hattan crescent has demonstrated that the area of enriched schist in which the big four has proven up such an immense tonnage of ore reaches tor for at least 1500 feet to the south from the crest of the big four and crosses the main portion of the reilly fraction the ore zone was first proven by open cut for a depth of fifteen feet and for an extent of about 35 by 60 feet the ore being broken down by churn drill work 15 to 35 tons of ore being broken ready for the mill by one shot the operators are now tunnelling tun nelling cutting the ore about 20 feet below the open cut everything as broken is shipped to the mill recent mill tests demonstrate that the ore zone in its entirety will break on an average ore from 6 to 12 per ton the big pine lying between the big four and the reilly fraction contains the same belt of ore the wittenberg lease which is operating on an extensive scale has a crusher installed at the mine to break up the coarse rock hoisted as the pay is found in the fines in the seams and fractures of the rock A tonnage of about 30 tons per day is placed in the bin from the crusher the immense tonnage exposed in the mine means that for several years good profits will be made in mining same the south end of 0 the brady lease on union nine claim has already milled 1276 taking over the lease As since tons of ore soon as the electric sinking pumps arrive deep mining will be pursued and the rich ore bodies when opened in depth no doubt will reproduce the experience of the operators in the upper levels over a quarter of a million dollars having already been extracted from this section of union nine claim the rakestraw lease on the little grey is busily engaged in sinking the working shaft on the of the vein from the to the foot levels all the material hoisted from the shaft sinking is placed on the ore dump the values in the ledge having increased steadily since sinking was resumed prom from the foot level a drift will be run into the lease block obtained from the manhattan dexter and a raise will be put up to connect with the shaft on bock block no 12 wherein a large tonnage of low grade mill ore has been developed an electric hoist has recently been installed on the manhattan whale and sinking and lateral work has just been resumed from the upper levels some good ore has been exposed the nevada california power company which furnishes the power for the mines and mills of the district the generating plant being miles from manhattan at bishop california and the branch line leaving the main line at millers nevada 37 miles distant has proven one of the main factors in the successful development of manhattan an average of electrical horse power is used each 24 hours thirty five diff different erent operators utilizing electricity tri city there are seven air compressors 14 hoisting plants and 78 constant constant speed motors being used at the present time throughout the district the town lighting system is separate from the power transmission although both lines receive electricity from the manhattan substation sub station |