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#1 12-10-2019 09:08:42

FlyBabies en progrès
Date d'inscription: 01-08-2016
Messages: 98

Prominer (Shanghai) Mining Technology Co.,Ltd.

Cyanide is used in the electroplating industries, the tanning industry and in specialised laboratories. Sodium cyanide is also used in New Zealand to produce a cyanide paste for opossum control gold processing plant. A complex cyanide, prussian blue, is used for dyeing jeans.
Before the cyanide process was introduced, although the assay value of the quartz at Martha Mine was reasonably high, gold recoveries were low. The first cyanidation plant in the world was established close to Waihi, at the Crown Mine at Karangahake, in 1889. By 1892 there were six cyanide plants on the Ohinemuri Goldfield, plus others at Thames and Coromandel. The process was a great success, as the recovery of gold improved from 40-50% to 85-95%. During this time tailings containing cyanide were deposited directly into the Ohinemuri River from various Rare Earth Minerals Processing Plant operations. Despite this practice, there have been no long term adverse environmental effects from cyanide use.
Hydrogen cyanide vapour has been used to fumigate buildings and ships, to exterminate rabbits, rodents, and large predators, and in horticultural practice to control insect pests that have developed resistance to other pesticides (Ballantyne, 1988). Sodium cyanide was used for about 50 years by the US Fish and Wildlife Service to control coyote numbers and so protect livestock.

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