Show DeLAMAR delamarr 5 GOLDEN GATE MILL mercur the great gold camp of camp floyd district which has recorded an almost phe nominal growth during the last six or seven years can now boast of several reduction worlds works using the cyanide process of ore ra the first plant in the district being jv X ilk all W ar 7 DE LAMARS LAMARIS GOLDEN GATE MILL AT MERCUR that installed for the treatment of the product of the mercur ITer cur mine an 1 while this mill has been steadily enlarged it still falls short of the daily capacity of which the golden gate woj works I s can lay claim although the golden gate mill is of more recent construction st and it can safely be said without fear of successful contradiction that this is the largest and most complete cyanide mill in the I 1 cited states this plant is an ornament to the mining industry of this western country and a mon ment to the enterprise sagacity and progressiveness gressi veness of captain J R delamar to whom the golden gate mine and mill belongs as well as to his corps of able assistants among whom are victor sf af clement general manager duncan Me Vichie general in D C jackling assistant general superintendent W II 11 cunningham treasurer c and owen spencer private secretary the de lamars mercur mines company s golden gate mill the construction of which was begun beglin in the summer of 1897 and which has been in operation a little over a year is the largest leaching plant in the united states and probably the largest mill of this kind treating ores direct in the world 5 in extreme outside dimensions it is feet long and feet wide the mill is erected on the side of a mountain and from the top of the lowest wall to the top of the foundation f oun dation wall of the upper side of the mill it attains a vertical height of feet while from the top of the lowest wall to the apex of the highest section of the mill is feet vertical the mill is built on eight different levels which contain seven sections having the following dimensions SECTION A at the extreme upper side of the mill forms the coarse crushing department a and no is enclosed by a building 43 feet wide by 75 7 feet long and feet high the CONTINUED CONT INVEr WN ON De LAMARS LAMARIS GOLDEN GATE MILL CONTINUED FROM PAGE FIVE building is is divided into three stories the upper portion comprising the receiving bins for the ore from f born the mine the middle section containing the coarse crushing machinery and the entire lower portion consists of steel storage bins having a capacity of 2500 tous tons of crushed ore two no 6 style M D gates crushers set directly on top of the receiving bins and have a combined crushing capacity of 1500 tons in twenty four hours SECTION B immediately belo below w comprises the ore drying and conveying department the ore from the storage bins being fed to the dryers when drying is found necessary or to belt conveyors in the dry seasons of the year the ore is automatically fed to the dryers or conveyors as the case may be and automatically discharged from them to the crusher rollers in the next department this section contains two line dryers 12 feet wide by 80 feet long and two cylindrical rotary dryers 8 feet in diameter and 30 feet long having a combined capacity of drying tons of ore per day SECTION C contains the fine crushing machinery and ore sizing appliances necessary to finish the crushing of the ore to the proper size to be delivered to the roasting furnaces in the section below in SECTION C there are nine sets of gates rolls four 36 inch and five 26 inch all belt driven the sizing machinery consists of eight sets of berthelet berth Bert belet elet screens or separators three large hexagonal revolving screens and six 14 inch elevators by means of which the finished product is elevated to the storage 1 bin on this section which is a steel bin holding tons of finished ore the machinery in the above section has a capacity for finishing tons of ore in twenty four hours SECTIONS D and E comprise the roasting department consisting of three levels each 33 feet 4 inches wide by feet long each level contains two straight line mechanical roasting furnaces making six furnaces in all at the present time which have a maximum capacity of tons of ore per day in the operation of these furnaces the ore is received at one end and mechanically conveyed through the roasting hearth to the other end a distance of feet here the red hot ore is automatically elevated to a cooling floor on top of the roasting furnace and returned to the orif original final feed end of the furnace by the same mechanism that conveyed it through the roasting hearth by the time it has traveled over feet of cooling floor it is perfectly cooled and ready to go direct to the leaching tanks all AH the roasting furnaces discharge their finished product into a large bin or hopper excavated in the floor of the middle furnace level this hopper is communicated with by a tunnel from the tops of thelea the leaching ebing tanks the loading cars being run into the tunnel and filled from the hopper above SECTION F contains the leaching department which consists of 22 steel leaching tanks each 25 feet fee wide twide by 50 feet long and 5 feet deep having a capacity of tons of ore each above the leaching tanks running lengthwise of the section are four tracks for tram cars for loading the tanks the leaching in tanks are supported entirely on ste steel elthe the bottoms being eight feet above the ground floor which gives ample s space pace for the tailings tracks run nning lengthwise of the building underneath the tanks of these tailings tracks there are also four the combined capacity of the 22 leaching tanks is about tons of ore this department part ment is 60 feet wide and feet long lone the bottom section of the mill contains the precipitating department this department part ment is 50 by 70 feet and contains three steel precipitating tanks of 40 tons capacity each 2 steel storage tanks of tons capacity each and one sump tank of tons capacity there are also in this dep department depart artinenci arti meni neni ten stilwell bierce smith vaile company companas comp anys s filter presses and two rotary pumps the latter having a combined capacity of 1200 gallons of solution per ini minute nute above the leaching section and at the north enil end of the roasting department is a small section 30 feet wide and 90 feet long containing three solution storage and standardizing ard izing tanks having a combined capacity of tons of solution the amount of solution on hand in the various storage and sump tanks and in the leaching tanks in the mills is never less than 2000 tons immediately back of the mill and about feet distant is the power house w which lich contains the hoisting machinery for the mine and also the air compressors for running ning machine drills this power house is is a brick structure one story high 70 feet long by 30 feet wide in it is one double drum electric hoist for operating the skips one single drum electric hoist for operating the cage and one horse power electric driven air compressor between the mill and the power house is isi situated the companas comp anys sub station from which power is distributed to the various various parts of the plant power is received here at a pressure of volts from provo canyon a distance of about forty miles the voltage is reduced in the sub station to volts for distribution about the plant the entire plant is operated by two phase induction motors distributed in such a way as to make each department as nearly independent independent of the others as possible so that a mishap in one does not close down another there being fourteen motors about the plant ranging from 5 to horse power just north of section C and on the same level are situated the machine and blacksmith shops and Ware warehouse bouse the mouth of the incline leading to the mine comes to the surface just in front of the machine shops and the ore is hoisted from this point over the top of section B to the atop top of section A where it dumps automat icalla into the receiving bins above the crushers the ore is hoisted in one haul directly from the bottom of the mine in skips running in balance up feet of vertical shaft and feet of incline below the storehouse and opposite the roasting department is situated the assay office and refinery which occupy a brick building 30 feet wide by 80 feet long the operation of the plant is entirely automatic in every department excepting the leaching department where the ore is loaded into the tanks with cars and the tailings discharged from the tanks by shoveling them through openings in the tank bottoms there is now being added to the south end of the present roasting department an additional building feet wide by feet long which will contain three additional straight line roasting furnaces furm ices the production of which will increase the capacity of the plant to about 1000 tons per day the entire plant is constructed of steel throughout and is absolutely fireproof fire proof all the shops ahdout and outlying out lying buildings are also fireproof fire proof being constructed either of steel or brick |