First I need to know what you're trying to do here. If you're going after the gems then I would classify it down to a workable size. I know in my gold extraction the first thing I do is crush it to 50 to 100-. Then I remove all the magnetics, then I classify it and depending on whether it has sulfate or not I roast it to remove the sulphates. Then I table it. But like I said initally it all depends on what you're trying to do. So if you can email me at firstname.lastname@example.org. That's the only way I can help you with some type of direction.