What is alluvial gold dust?

Let me guess, you got a message that started out like this: "I AM IN POSSESSION OF 1600 KG ALLUVIAL GOLD DUST OF 23 CARATS PLUS AND DIAMOND OF 25000 CARATS WHICH I WANT TO SALE ON THE INTERNATIONAL MARKET."

First off, stop. It's a scam and you're not going to get what you think you're buying, even if you were to buy it. Secondly, lets briefly consider the amounts here. 1600KG = 3527 pounds. That's almost two tons. That's a lot of dust, "alluvial gold" or otherwise.

But it gets more amusing. A 25,000 caret diamond is unimaginably, idiotically huge. The largest cut diamond in the world is the The Golden Jubilee, which weighs in at only 545.67 carats. (I say "only" but the fact is it's worth so much money that if you had a diamond of this quality, you wouldn't be bothering emailing people trying to get help from out of the country!)

Here's what I could dig up about alluvial gold dust:

"The word Alluvial describes a type of soil. It can be made up of sand, silt, clay, gravel, or other matter deposited by flowing water. The term "Alluvial Gold" specifically refers to gold dust found in that type of soil. When riverbed soil is scooped up and panned for gold dust, that ist alluvial gold."[ref]

How much is it worth? Does it really matter? :-)