Silversaddle, that's a really nice display of the raw materials that processors would take without hesitation. What's in question is the "value" of the material, i.e. what someone is prepared to hand you $20 bills cash for it. One man's value might be very different from another, because of situation, experience, motivation, and knowledge. I might believe that my old Chevy is "worth" $9,000, but if I can't get an actual cash offer over $5,000, then it's worth $5,000.
Similarly, your wonderful material here contains a certain amount of gold, which has a relatively fixed market price. The magic question is how much gold, and nobody knows that until after processing. By then, it's way too late for the buyer to go back on the seller, and the seller has to decide to consider their profit based on cost, and either take the cash offered in hand and run, or else hold it for another day. Most weighing in here with calculations and estimations are basing their numbers on documented but theoretical yields, and aren't accounting for:
Lab space, overhead (rent, electricity, water, taxes)
Chemicals
Equipment (fume hood, glassware, pumps, filters, pails, scales, smelting station, consumables)
Labor (prep/crushing/cleaning/sorting/processing/washing/filtering/drying/weighing/smelting/selling)
Safety(equipment, workman's comp costs)
Environmental (Waste stream collection, processing, neutralization, disposal)
Profit
This is not fluff, it's reality. Perhaps someone has tried to or thinks they can do all this on their remote farm outdoors, wearing flip-flops and shorts, no tops, like in those online videos from India. That's a cruel joke on the workers, but is real. Here in America, we do it right, safely, in an environmentally sound manner, and profitably. My experience tells me to pay 50% of the hoped for gold value yield calculated. To me, this hoped for yield is US$25,312 based on the spot price of gold today at US$1,582/T.oz. and 500 grams = 16 T.oz of pure gold. So I would pay US$12,656 in cash for this.