· Custom made to your specifications

· 12 Gauge Aluminum Hungarian Riffle Sets or 

· 20 Gauge Steel Hungarian Riffle Set

· 1/8” steel side rails

· Mig welded

· Heavy duty industrial equipment paint optional

· Have done the research and testing to design what works

· Designs for Fraser River fine gold recovery

· Designs for Cariboo country nugget gold recovery

· Yes there are different riffle setups for the different gold size recover

· Yes there are different sluice box setups for different gold size recovery

· Pretty much able to build anything required for hand mining gold recovery

Price: Varies on Designs

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Detail of hopper construction, simple and strong, effective equipment.

How to Recover Fine Gold


Fine gold, fine, fine gold, if you can recover fine gold trough the use of a sluicing system then you will be able to recover any and all gold that is in the ground and gravel materials that you are working.  The amount of fine gold compared to coarse or nugget gold is far greater in a yard, cubic metre or ton of gravels and alluvial deposits.  So being knowledgeable about and equipped to recover fine gold will end up putting more money in your pocket than chasing the dream of large nuggets and coarse gold generally ever can.


The first thing that you will need to know for the recovery of fine gold is how a sluicing system and riffles work.   What is it that actually goes on in a sluicing system, what makes it one of the most efficient methods for the separation and recovery of gold from alluvial gravels? 


Specific gravity is part of the equation, now the specific gravity of gold is 19.3 making it one of the heaviest minerals around, there are a few that are heavier but gold is what we will be focusing on for now.   Now most of the materials that make up alluvial gravel deposits that are being mined for gold are in the specific gravity range of 2.5 to 3.5 with some heavier exceptions, so this allows us to use the suspended and bedded loads to sort the gravels and sands.  The riffles and matting are used to catch and hold the heavy minerals until we decide to clean out the sluice box and process the concentrates, yes that is right, the sluice box is only for reconcentrating the gravel down to a fraction of the original amounts, not based on size but on Specific Gravity.


So to simplify this we are going to look at what works, not a bunch of theories of what might be or could this, only what I have found works well, efficiently, and is cheap to build and operate. The sluice box and riffle system, now these have been around for hundreds of years and have been used to quite some success, however until recently the actual working physics of a sluice/riffle system were not completely understood.  I will attempt to explain this process to you in laymen’s terminology, rather than fill your head with formulas and theories


In the sluice box we introduce water, sands, silts, and gravels, now the water is what is used to transport the materials from one end of the sluice to the other and in the process gravity and specific gravity allow for the heavier minerals to settle towards the bottom of the sluice and the lighter materials are catch up in the water as a suspended load.  Now this works to a degree and it doesn’t, as the bed load materials can and will be caught up by the water flow and moved along and right off the end of the sluice.  To trap and hold the heavy minerals in the sluice we need some obstructions in place, this is where the riffles and matting come into play, and the matting while having importance in gold recovery, is not as relevant in the recovery of gold as the riffles.


The riffles now these are important and having the right design of riffles will make an enormous difference in the amount of gold that you are able to recover from a cubic metre, therefore the amount of material that one will have to excavate and wash through you sluicing system when working.  So having the right type of riffle system for the type of sluice box operation you want to use is going to make your gold recovery more efficient and cost effective, therefore more gold in your pocket at the end of the day.



How Riffles Work.






back and forth until you have reduced the gravels down to ¼ minus and then take that material and run through the sluice box.  This does work, but is very labour intensive and slow.  The highbanker set up has a pre-screening device attached, this device is called a grizzly and can changed from a 1/8 inch openings to ½ inch openings, you don’t want to have anything larger than these sizes running through the sluice box as the large materials can and will lodge in the riffles and cause the water flow to scour the concentrates in the riffles and wash the concentrates out of the sluice box.

Okay now after the gravel/clay materials have been through some type of classification we run them through the sluice box, with the proper amount of water flow, feed rates, pitch, and riffle design it is possible to recover 90-95 percent of the gold that is contained in the materials that you are processing.  So what I have found that works for the handmining, is to use only a couple of designs, 8-10-12 inch wide sluice systems with a 1.5 in 12 inch pitch running 30-45-60 gallons per minute respective to size of sluice width, with ½ inch angle iron riffles spaced at 1 ½ inch apart for the first 12 inches of the sluice box and for the last 24 inches of the sluice box use ½ inch high by 3 inch open expanded metal riffles.  This will catch any larger pieces of gold in the first foot of sluice and any of the fine gold will be caught in the following expanded metal riffles.


 Underneath the riffles configurations I like to use a porous carpet material that is normally used as a pot and pan scrubber, it’s available through local home stores in packages that are 8x6 or up to 6x12 inches and 8 or 10 to a pack, these you will either fit into the sluice box individually or you can glue them together into a sheet that runs the length of your sluice box.  This material is cheaper and in my opinion traps fine gold better than expensive miner’s moss, $4 to $5 dollar for 12”x 36” for scrubber pads $35 to $45 for miner’s moss. But in a pinch even a piece of indoor/outdoor carpet or a towel type material will work fairly well, as long as it is able to make a good base for the riffle set up to seal on, reducing any scouring of your fine concentrates out of the riffles.


Cleaning up the sluice box and the riffles, this is where we see if the ground and materials that you are working is any good or not, it is important when prospect testing to do reliable controlled amounts of sampling, measured amounts of materials versus measured amounts of gold and other economic minerals recovered, this enable you to properly evaluate the property for the purposes of handmining and possible development into a working mine at some later date.  So now at the cleanup stage we will want to be very careful in removing the riffles and concentrates from the sluice box in order to get an accurate reading and measurements of the,

 (A) Amount of gold per yard, (B) Sizes of gold types in materials, (C) Where in the gravel deposits the gold is coming from, as in possible paystreaks.


With this in mind if you have a two piece riffle system, which I do recommend, (A) take them out and rinse off in tub then (B)  take the front carpet out and wash it out in tub, (C) take the back carpet out and wash that out in a different container, this is to keep the heavy larger concentrates separate from the little smaller concentrates.  Take the concentrates in the first tub and first classify it down to ¼ inch materials, carefully check the oversize material and anything that appears to have any values (gold, silver, platinum, and gemstones) save and place in sealed container, pan the concentrates down using your tub for dumping the tailings. Once satisfied with the results or the first part of the cleanup store the finished concentrates into a sealable container and continue with the concentrates from the tail end of the sluice box, once you have went through these concentrates you will have a fairly good idea as to what type of gold you have as far as size, coarseness, values of gold oz per yard of materials.




There is a very good reason for this, and I will explain that here, knowing what the size of your gold is in the alluvial deposit allows you to set up a wash plant system tailor made to recover that specific size and type of gold making your operation that much more effective and labour, cost efficient.  So depending on the size of gold recovered you may want to have larger grizzly opening and run higher volumes of water if the gold is nugget size with very little fines involved, or if the gold is mainly fines run smaller grizzly openings and less water to make recovery of the fines more effective.  Testing the gravels with a methodical sampling program in mind and recording your results will, with practice and trial and error give you the information needed to properly evaluate your prospect and claim and most importantly set up the right type of wash plant gold recovery system.


Recovery of the Gold from Your Concentrates


Once you have mastered the basics of fine gold recovery in your sluice box comes the task of the finally separation of the gold from the concentrates, now the larger nuggets and flake is fairly straight forward, after taking your concentrates out of the sluice box sift them through a series of sieves to classify the different sizes of concentrate.  The way I have found to be the simplest and most effective is it; have 3 or 4 sieves of these sizes 10, 20, 60, 100 mesh count, you can get these through any good mining supply shop, they are stackable and that’s the best way to use these devices.  So taking five 20 litre plastic bucket set them in a row, take the last bucket and stack all the sieves on it, the sieves are made to fit on the buckets, 10, 20, 60, 100 mesh stacked in that order top to bottom.  Now place a couple of cups of your concentrates on the top screen and using a hose or small container wash the concentrates through the screen shaking from side to side gently, use the water to wash the materials down through the screen not the shaking action, you don’t want to be wearing the screens out, they are expensive to replace. PICS


Once you feel that you have washed the finer concentrates from the top sieve take and check the oversize for any visible gold nuggets or pickers, take your handheld gold detector and run it around through and over the materials to identify any gold that you may have missed, then dump it in bucket No# 1, and continue on to the 20 mesh sieve, repeating the process.  Now as you get to the 60 mesh sieve you will really want to use water to wash the concentrates through this screen as well as the 100 mesh, these screen are made of light material and will wear out very quickly if you try and shake or grind the concentrates through. PICS< PICS


Continue with this process until you have reduced all of your concentrates into 5 classification sizes, make sure after using your expensive screening sieves that you shake all the moisture out and hang them up to dry before storing them away, they will rust.  Now you’re ready to start on the finishing process, here is where we get to see the gold from the day’s workings.  First take the bucket with the 10 mesh size and over and this is easy enough to hand pan down, it wouldn’t hurt to look real closely at any of the material before discarding, a lot of gold has been tossed away because the person didn’t realize that gold can be discoloured and be a colour from golden to a dark ruddy bronze, also take a look for any garnets, or other possible gemstones.  The next container to start on is the 20 mesh size and larger, this can also be panned down fairly quickly or you may want to use a green board or slick board as it is sometimes called, now you can buy these already made or you could invest a little time and a couple of bucks and make your own. I’m going to explain how to make one that will work just fine for this purpose.


 Now how to use the green board is actually fairly simple, you will need to have a nice even supply of water through a hose connection or a small fish tank type pump, you don’t need a lot of water for this application, so you get all that  hooked up and then you want a smooth glass like flow of water down the board, this is accomplished by placing a piece of the handy scrubber material behind the fence at the top of the board and having the water flow through this first, it will equalize the water flow across the width of the broad and reduce any surging that may occur.

Once you are to this stage it is time make sure you have your soft bristle paint brush handy and then carefully start with 1 tablespoon at a time, feeding the concentrate onto the upper end of the board, the water flow and gravity separation will start to wash the black and other light weight sands down across the green board, the gold being heavier will stay more or less in place and you use the paint brush to swept the gold off to one side to be collected later in the process.  Once you are finished with the 20 mesh size swept and wash the gold you have recovered into a suitable container.

As you progress into the 60 mesh and larger size concentrates you will find that you may have to adjust the water flow as well possibly the angle or pitch of the green board to maximize recover at this stage and again when dealing with the 100 mesh and over.  I find that the 100 mesh under size is the hardest to deal with, but it is well worth the time it takes to clean this up as well, you will be amazed at the amount of real fine 100 minus gold that there is to be recovered and it all adds up in your pocket.

It should be noted that there are many other methods of refining your concentrates to recover the fine gold that is contained within the black and yellow sands; I’ll give you a short list of them.



Spiral Wheel Type Gold Concentrators

These are real good for gold 20 mesh size and larger, easy to use, but not all that good on finer gold.  There are a number of different makes of this type of device on the market; all of these work pretty much the same as the other.



Mini Cleanup Sluices

These work reasonably well to clean your concentrates down to again 200 mesh size these are fairly simply to use and there are a variety of manufactures of these types of finishing sluices.


Falcon Gold Detector

Hand held little device that I highly recommend as a tool to have with your equipment in the field as while you are finishing your concentrates off, there is a lot of gold that can hide in your pan or concentrates, because it doesn’t have that real brilliant gold look to it, using this little device could be the difference of putting some nice gold in your pouch or throwing it away.

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