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Gold Hog - Sluice Mat

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sluice mat
 

Sluice Mats…

What started as a study focused on riffles quickly turned into something else.  We ended up looking at the ENTIRE sluice box and the role of each component.  After watching literally hundreds of hours of recorded video and testing, something became VERY clear.  The “riffle” played a role in the sluice box, but its role had been given TOO MUCH focus as well as a mischaracterization.

We came to the ABSOLUTE conclusion that the RIFFLE does NOT hold gold.  The riffle creates a break in flow and a low pressure zone, what we call a LOW CURRENT zone.  This low current zone allows material to build up based on the vortex that the riffle creates.  However, you will notice that the material is sitting on the MATTING, not on the riffle.  Therefore we removed the phrase “riffles holding gold” from our conclusions and verbiage.  The riffle creates a DISTURBANCE of the lower level of the MIX.  This lower level now must go over the riffle and HOPEFULLY settle back down when it hits the vortex.  This DOES happen to an extent, but we did find issues with “launching” of heavies and gold from the lower levels to the mid to upper levels of the mix. 
This constant disturbance of the lower level can have negative impacts on recovery rates.  If riffles are too close, the gold can simply “ride the riffles” all the way down the sluice.  We found spacing the riffles a bit more helped to resettle the gold, and gave it more contact with the matting surface. 

Also, vortexes during a normal run can and do break down often releasing the “stored material” behind the riffle.  It now becomes the matting’s job to hold the gold.  This is where our UR matting does a great job. The hidden sub-chambers give a place for gold to hide, out of the vortex pattern and all currents.  It remains ACTIVE regardless of the flows direction. (which varies with vortex impact zone)  A flow may be forward, down the sluice, backwards, up the sluice, or straight down from the back edge of the vortex.  In each case the UR mat gave resting and hiding places that passive mats do not have.  (Miner’s moss and carpet)

It was VERY clear that most passive mats rely on water flow and current “blow out” to clean themselves. They create little to no active reduction on their own. Hence the design of the Gold Hog™ UR mat. It quickly cleans yet does so in an active reduction manner, retaining the heavier materials. 
Passive mats hold ALL weights and densities of materials. They act in a “first come, first settle / hold action” except for a very small portion of the top layer. 

The dancing effect…



If you watch the material working BETWEEN riffles, you will see what we call “dancing particles”.  Most people assume material moves only down the sluice box in one path towards the end. However, if using riffles,  the crashing vortex and the leading edge of the next riffle cause a “fighting current”. This causes material to DANCE back and forth on the matting / sluice bed.  This is an EXCELLENT time to catch gold as an active matting creates a “quasi fluid bed” allowing the heaviest of materials to sink and hide.  However, on passing matting surfaces, this is MUCH less prevalent and material does not DANCE as much, nor does it have a place to settle.  
This is why we constantly saw gold captured not only behind the riffle, but throughout the sluice mat and in-between the riffles.  If gold is given the opportunity to settle, it will and it will do so throughout the running process.   This was also a VITAL element in the design of our UR mat.  We wanted gold to settle and be captured throughout 100% of its travel and be held. 

 

 

 

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