The cyanide would have completely died 38 years ago.. the trouble with cyanide is its complete lack of persistence.. it is hard to keep alive in a mill circuit, thousands of natural "cyanicides" abound.. iron, copper, sulphate, etc.. and in nature it disappears like magic.. the CDN government is totally not worried about cyanide because in 110 years of use it has never resulted in a fatality from a tailings pond...
The most common use of cyanide is in the metal plating industry, where 12 times what is used in mining is employed routinely and the cyanide waste "killed" totally by chlorine, ozone, thiosulphate and other methods.. and the harmless residue goes into 1000 storm sewers.. Boats in harbours throughout the world fumigate for pest with cyanide gas in port and people are non the wiser.. the wheat transported in these boats contains no trace of the substance..
There is enough cyanide in 50 peach pits and 5 lbs of lima beans to kill you dead in one hour..
The most common cause of cyanide poisoning, which occurs 5 times per hour in North America, is smoke inhalation.. which kills from cyanosis -- smoke contains hydrogen cyanide especially if it emanates from burning plastics .. this explains the colour of a person who has been exposed to smoke .. flushed pink and seemingly not deprived of oxygen except at a cellular level..
cyanide at a certain low, low, level is non toxic and is naturally handled by the body where it is common in fruit seeds and other anti-oxidants.. the pro-antho-cyanidins.. it is a positive benefit.. but at a certain critical level which is very low also, it becomes very toxic..
Tailings ponds do not contain harmful amounts of cyanide. their cyanide is very dispersed and locked into ferrocyanates.. but under certain conditions very high sulphide ponds that had imperfect cyanide destruction may release their cyanide very locally upon sulphide oxidation.. that has to be watched for, but overall, unless you are handling the material it is not a widespread environmental hazard.. heavy metal would be much more serious and even that is an overrated hazard.. but environmentalists trying to make hay with propaganda..
The fundamental problem with all the environmental propaganda is that it is weak science and hooey.. the real waste problem by the second law of thermodynamics, is that pollution only occurs at a serious level with the secondary and higher processes. Low level primary processes such as mining cannot cause enough break down of substances, oxidation, or process toxicity and resulting spread of toxins to worry about. Exceptions to this rule where smelter gases spread widely are admitted.. but tailings ponds don't go far.. everything stays where it is put.. and that is often far from much human habitation or uptake..
It is the cities and factories that are responsible for 99% of the spread of toxins. The were never worried about in the past because of their admittedly low level. The principle of increase in due to heirarchy of the food chain and its concentrator effect, that it became apparent that low level diffusive spread of toxins into basins was a hazard.
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