Gold and Silver Juniors, Mid-tiers and Producers Message Board

STOCKTALK

We've detected that you're using an ad content blocking browser plug-in or feature. Ads provide a critical source of revenue to the continued operation of Silicon Investor. We ask that you disable ad blocking while on Silicon Investor in the best interests of our community. If you are not using an ad blocker but are still receiving this message, make sure your browser's tracking protection is set to the 'standard' level.

Gold/Mining/Energy : Gold and Silver Juniors, Mid-tiers and Producers

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next

To: hubris33 who wrote (8905)	4/6/2006 1:20:19 AM
From: E. Charters	Read Replies (2) of 78412

Did you know that bromine can dissolve gold in 15 hours and chlorine gas in 24 and iodine whose only source is Argentina and sea plants, in one hour? Bromine was competitive with cyanide in 1870-1890. Cyanide won out because it was cheap and had fewer cyanicides than chlorine, which would not work with too much iron. Kokomo Colorado was the place where cyanidation was perfected and beat out gravity processes and chlorination. The real winner was developed by an engineer in Colorado in the latter part of the 19th century and that was a process of roasting and cyanidation of the concentrate which got 90% recoveries on the refractory ores of that region. This was 2.5 times better than previous methods. Custom milling with this process proceeded through one outfit until 1920. The death knell of this methodology was in the 1920's and 1930's when new environmental legislation restricted the sulphide roasting that was the key to the success. It took another 60 years before a Haileybury Engineer proposed a variant for the Carlin ores of grinding, autoclave, which was essentiall roasting without the off-gas, and cyanidation. It used more energy but allowed full recovery and licensing because of effluent abatement. This more than anything made the Poste Betze and other American Barrick Mines profitable despite their fundamentally difficult ores. And it made Peter Munk very rich. Many many mines in Canada failed to continue or expand because their ability to roast concentrates was resrtricted from the 1950's to the 1980's. Red Lake had to roast much of their ore. Kerr Addison got their profit from go-generation and roasting-release of micro fine sulphide entrapped gold ore. When these licenses were revoked some of the mines closed. Some had to go to other methods. Kerr Addison did not show much imagination. Their honchos had run their course and would not fight anymore. It was time to go. EC<:-}

Report TOU Violation

Share This Post

Public Reply Prvt Reply Mark as Last Read File

Previous 10 Next 10 Previous Next