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The tailings are placed in vats, and subjected to the action of solutions of cyanide of potassium of varying strengths down to 0.2 per cent. These dissolve the gold, which is leached from the tailings, passed through boxes in which it is precipitated either by means of zinc shavings, electricity, or to the precipitant.
I mean a powder that could be held to a person's nose and mouth in the open, when it would make that person sick and give him cramps perhaps." "And kill him?" "Yes." The old doctor rubbed his hands in thought. "That is a subject for speculation. Certain cyanide compounds might be powerful enough to do so under certain conditions. Any real dry powder would choke a person if he got a big dose of it.
That is how the whole story came to be known. At the trial the lover saw his mistress compelled to turn State's evidence against him to save herself. She testified to the Christmas carols and the cyanide of mercury. "Did you ever remove this terrible poison from the bolster?" demanded the defendant's counsel in a sneering tone. "No," answered the woman.
If their report be favorable, an estimate is made of the cost of a five-or seven-compartment shaft, to be sunk, say, 3,500 feet. The cost of producing a year's supply of ore for the mill is then considered. The cost of the mill and the cyanide plant is also figured.
The first time that cyanide of potassium is sold for alum, or corrosive sublimate for bicarbonate of soda there will be an éclat given to the dealings of this shop which will be very gratifying to its owner. The telegraph in Yunnan is very largely used by the Chinese, especially by the bankers and officials.
He then put a small object into the warder's hand. At the same time he apparently suffered a tremendous physical convulsion, uttered one groan and leaped up into a sitting position. From this he fell forward unconscious. One attendant supported him and the other ran for the prison surgeon. But Pendean was already dead poisoned with cyanide of potassium.
It was a strange parting message, not reassuring and quite enigmatical. I took my Mauser and also hid in the cuff of my coat my cyanide of potassium. The Baron was quartered in the yurta of the military doctor. When I entered the court, Captain Veseloffsky came up to me. He had a Cossack sword and a revolver without its holster beneath his girdle. He went into the yurta to report my arrival.
Lifting the lid, they removed the packing and found in that box books on birds, trees, flowers, moths, and butterflies. There was also one containing Freckles' bullfrog, true to life. Besides these were a butterfly-net, a naturalist's tin specimen-box, a bottle of cyanide, a box of cotton, a paper of long, steel specimen-pins, and a letter telling what all these things were and how to use them.
In some cases, as for example, that of silver, solution of salts forming complex ions, like that of the double cyanide of silver and potassium, yield better metallic deposits. Most metals are deposited as such upon the cathode; a few, notably lead and manganese, separate in the form of dioxides upon the anode.
The white residues gleamed beneath the moon, from every smoke stack poured smoke: the dragon breathed. Then the great white cyanide tanks were like bosses on the beast; the train stopped, and the battery roared. That night, for it was a silent and windless night, I heard forty miles of batteries beating on the beach of my mind like a great sea. And men laboured in the bowels of the earth for gold.
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