Depends on the gold plate. Depends on how much gold fill, wear levels, etc. I'd gladly do $30/lb.
There's no effective way to sample this without just running it. It's not something that can be economically run in a furnace if it has a bunch of stainless. If it's all copper or brass based, then I'd melt, sample and piggyback it with SPC wire to Xstrata and let them electro-win it. But that takes poundage.
Ideal way to do mixed lot: strip it with cyanide, rinse, what doesn't strip gets pulled out and melted. Dissolving that much copper makes a bunch of nitrogen oxides...