The most I've even ever read about in a legitimate sourced book is 15200 gpt which works out to 488 opt. That came from a sample in France and certainly wasn't anything more than that.
You could pull gold out of arsenic without cyanide but it would be a royal pain in the ass dealing with it prior to cyanide. You'd have to grind it down, roast the hell out of It, smelt it into a matte and then regrind before amalgamation. I wouldn't even want to wager how low the recovery rate would be.
I wish I could remember which mine owner said "the gold in the mine is in Arizona, but the money is back East."