Bisbee daily review., 1904-04-19
To 0btaIn Pure
 GOLD FROM
 Cyanide oulIion
WHEN SILVER IS PRESENT iS LARGE QUANTITIES IT MAY
 5E EASILY SEPARATD.
An Able and Accurate Statement of the Treatment of Gre Where the he- suit is Desired-Gold of Ninety-nine and six-Tenths May Be Procured.

When silver is present in large
 .uantities Tn cyanioe bullion, it ma,
 1e easily separated, and the gold oE.
 aimed in pure state, says Ores and
 delals. In this case. assuming there
 much copper in the bullion, 1t need
 ot be removed by prellmInary tTea.
 aent, with nItIic acid; the precipltate
 aay be washed free f.om sulphuriC
 acid, and then dried anc' smelted. The
 OaSe bullion should then be graRu!aI
 d straight away; if it contains more
 nan forty per cent of gold, some zinc
 cyanide gold, or ordinary chips an4 scraps CT gold zinc from the preclp
 tation boxes, should be melted dow
 10 small bar with be- az, and poured
 fae bullion rich in zinc should be add ed 10 that rich in gold, and the per ~ent2Se O. gold brought oown 10 about -orty. Should any Jumps of zinc be Q hand, 1t Is simpler and answe. as well to ado the requisite quantity as soon as the gold bullion has melted. To Sranulate the bull4on, get a large enameied bucket, fill with cold water
 Place a dish or enameled basin at the
 -N ~NCA CA A-4~ UhNhCA luS bullion from a height of a few feet in thin stream into the water, giving he crucible circular mouon all the lime so that the drops do not fall in he same place. The whole mass should be broken into flat discs ana hollow grains, thereby exposing a
 arge surface for the acid to attack.
 If the layer of water is tco shallow he shots may not be broken up suiii- cienty ana may fuse into a pyIam4dal aeap down below. If room enough is available the bullicn may be poured on to the edge of an inclined plate; IL is thus scattered and falls in flakes Into the water below. The bullion is
 hen treated by washing it with water, hen place it in a large porcelain @r1eible, add three parts by volume oi water for every part Of nitric acid; stand il on a sand bath made by making some sand red hot and pour Ing il onto a sheet iron vessel A 'lo-ent action scon goes on and the zinc, silver and copper are dissolved Jut. When brown fumes cease to come off after warming, pour of the ~ANthA As4NAO anu WASH UN uSCanlallOU with hot water three times. By hls treatment most Of the lead is got rid 'f. which would not be attacked by 8 'tTSnS acid Next, pour one parL O. water and two parts of nitric acid on he b.own Jumps of gold ana heat to polling for about half an hour. The balance of the silver will be dissolved. The stronS nitric acid solution, as rule, dissolves but little silver, and it lad better be kept for treatment of he next lot Of granulations. The 'pongy gold should be washed about ,our times with distilled water. ana hen with some warm dilute ammonia 10 dissolve any silver chloride out. These washings may be acded to the first Mutton obtained. Some dry pcwdei ed nitre may now be sprinkled 'n the gold; it will be absorbed. The gold may be dried in the dish. When dry put in pot which has been glaz- ed by borax; cover with a layer of salt and melt down. Gold Of 99.6 purity may be obtained.