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Fine Tuning Gold Hog Mats

Tips on using and tuning...

Update...

Please read the new book...
It's free.

 

WATER SPEED IS CRITICAL...
Remember what football coaches use to say? "Eat a big steak before the game." We now know that is totally incorrect. As research is done, science is applied, we learn more and more. The same applies to recovering gold.

It's Not Magic....
Our year of research had it's ups and downs. However, we quickly learned that when you apply SCIENCE... not opinions, or folklore, things start to work. You must take the time to understand the science, not only of our mats, but gold recovery overall.
 
Our mats are designed to ACTIVELY AND RAPIDLY exchange material based on their weight / specific density. The "battles" the mindset of HOLDING material. Most people, including us sometimes, don't get their mats active enough. Therefore the exchange is slow and we have gone back to the "holding theory".
Water Speed and Velocity...
The mats become active with high water SPEED, which is different than volume. Remember, you can run 8000 gallons hour through your sluice at a low pitch and the water SPEED will be very low. The mats will NOT be active just by adding more water VOLUME. Increase the pitch / angle and you'll see a HUGE difference. Water will race down the sluice giving the mats ENERGY and making them active.
Dancing Particles...
When looking at your mats, you should see HYPERACTIVE dancing particles. Now, did we say the are jostling around? No, we said HYPERACTIVE. They will be rapidly dancing around and look like they are about to be pulled out of the mat. That is the point where a good exchange rate is occurring.  
It's All About Playing...
Test your settings and use EXTREMES. Go WAY too fast, and WAY too slow. Don't try and hit it perfect. Slowly adjust your setup until you find the best exchange and recovery rates.
 

We have started this page to help with the many questions we get on using the mats and sluice bed setup in general. It will be growing daily, so check back as we answer your questions here.

 

What should the Scrubber Mat look like when running properly.
Click on the image below to expand...
(It will open in a new window.)


Installing in Dredges

The Smooth Swim / Flood Effect
Excessively high water volume / depths in your sluice box.

We really didn’t cover a great deal on this during our research but felt we should cover it for the few that might be impacted.  This gets a little tough to grasp, so we’ll walk you through it.

The smooth swim effect / flooding, is when water levels / depths get too high in sluice bed in relation to the riffles or sluice bed capture devices on the bed. (This includes our matting.)

From the picture / diagram on this page you’ll see various water “levels” in the sluice bed.  The “swim effect”  (flooding) happens when the LEVEL of water is too high in relation to the riffles installed. We most often see this in DREDGES that have little control over water FLOW or volume of water.
When this swim / flood effect happens you’ll often see the surface of the water in your sluice box “calm down”.  This has many impacts but the most significant is on your sluice BED / bottom of your sluice.

I will try and explain by building a picture in your mind.

First, imagine a stream that has nothing but medium size rocks on the bottom.
The normal flow for this stream is few inches over these rocks.
As the water flows over this rock bed, you can see how the rocks impact the flow. You see gentle waves, curves, ripples, and general distortions of the water’s surface.  If you look closely you find that water at the bottom, on the rocks / touching the rocks, has a strong flow.

Now, let’s flood the stream with a large VOLUME of water which increases its depth 4 times the normal. What happens to the surface of the water?  The surface of the water now “smooths” out.  The increase depth / volume of water has made the rocks on the bottom less of a factor and their impact is reduced significantly.  Often this will also reduce the water SPEED / velocity at the stream bottom as well.

This is why you will often see LARGE riffles in a large dredge / sluice bed, and smaller ones as the water volume / depth of water is reduced.  Putting ” mini riffles in a large dredge sluice bed that has 2 – 3” inches of water depth would create little WORKING action. This would allow the SWIM EFFECT to occur. Even though heavy material might sink to the bottom, there is little working action to HOLD it. There is often very little or reduced differences in pressure zones, ie: behind riffles, to separate materials based on their weight / specific density.

How does this relate to our mattings?
For most sluice or highbankers it really doesn’t. You can control the flow, depth, pitch, etc, and create the perfect action.
However, if you have a high volume dredge, where it is difficult to control water flows, volume and depth, then we suggest you keep your current riffles and use the UR mat with ”expanded metal over it.  Removing 2” or 3” riffles and putting in only Scrubber mat might actually cause the above swim / flood effect.    

 

 

 

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