Figure $100,000 in getting a good consultant for a few months time. Hand him the company credit card and let him go to town!
Consider also that you'll need to get instrumentation (ICP, XRF, fire assay/ spark-OES) and that'll run about $500,000 for middle of the range equipment purchased new. Also budget another $30,000 a year for maintenance of said equipment and consumables/standard solutions etc..
If you're doing gold in absurd volume (5000 ozt/day), it's cheapest to chlorinate and then electro-refine. You'll also need to set up a silver cell to recover the silver and the gold that reports in the silver chloride during the Miller process. Don't forget the baghouse and scrubber.
You'll need a way to control waste and also mitigate fumes. New equipment for that is several hundred thousand.
Several hundred thousand dollars for the large induction melters you'll want to have.
Everything depends on volume, but I'd say about a million US would set you up with something to be very, very proud of when showing clients.