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Saturday, December 02 2017

You might have heard the term “flood plain gold” and are wondering what it really means. A very simple definition is “fine-sized gold flakes carried or redistributed by flood waters and deposited on gravel bars as the flood waters recede.” When this “redistribution” occurs, it is usually after heavy winter storms that churned up rivers enough to turn part of the bedload over and move the river bar gravels from one place to another. Within these gravels is fine gold that was previously deposited there.  When waterways flow way up and above their normal banks, they generally drop the heavier gold in the front of the bar, and as pressure decreases, the finer gold starts dropping into the mixed gravel. Over time, some of this finer gold will work its way down to bedrock, but generally it stays on the move.

flood plain gold deposits

How did the gold get there in the first place? There are many classifications of placer deposits, and their definitions can provide the answer. Among the most well-known is stream placers. Streams carry gold from eroded veins and concentrate them in various ways. Modern streams refer to present-day gold-bearing waterways that are the most common sources of gold for today’s prospectors. Tertiary and intervolcanic channels are rivers buried from mud and volcanic flows that existed prior to our modern-day waterways. High benches were created as rivers cut their way deeper into the bedrock and could be located hundreds of feet above today’s modern rivers. Desert placers are generally the result of torrential flash flooding and not a constant water flow. Glacial stream deposits are created by melting glaciers that can concentrate gold if the water flow is sufficient. Marine or beach deposits can come from wave action against cliffs, from off-shore currents bringing in gold-bearing material from under the ocean, or even from gold-bearing streams that flowed into the beach area eons ago.

Since there is a strong possibility that gold can get moved around during storms, it’s now important to know WHERE to find this “dropped out” gold. The secret is to find that drop point and to capitalize on its accumulation. Fine gold looks fantastic in a pan or box, but its weight can be deceivingly light. It takes a lot of fine gold to be equal to a larger piece and to have enough weight to make the recovery effort worthwhile. Some of the best areas to look for flood plain gold are where the stream or river widens out, or levels out, or changes direction. The inside of a bend is good. Rocks and weeds and small shrubs are also potentially good collection spots. When checking out collection spots, be extra careful. Calm water on the surface can hide swift currents underneath.

Keep in mind that the effects of heavy winter rains and snow will not be the same on all waterways. Redistribution might occur to a larger degree on larger rivers. Or it could be the opposite where you live and prospect. No one hopes for an especially “bad winter,” but if Mother Nature makes it so, this information could be the silver lining— a way to turn lemons into lemonade come spring when you can get out and take advantage of any gold redistribution that occurs. Good luck and be safe!

Nugget of News Blog

Posted by: Denise AT 06:09 pm   |  Permalink   |  Email

Nugget of News Blog