Nuggets of News Blog 

Sluicing is one of the most popular gold-recovery methods, and a sluice box  is often a miner’s first purchase after a basic gold pan. There are many options to consider— riffles, matting, brands, and sizes.  You might want to stick with traditional z-riffle sluices with ribbed matting and miner’s carpet, try the new mini or vortex Dream Mats without riffles, or a combination of different types of miner’s moss. No  matter what you choose or upgrade to, sluicing techniques are fairly straight forward. The three main things to concentrate on for best gold capture are: proper selection and set up, material classification and processing, and monitoring. These three key steps will allow you to maximize gold recovery.

Proper Set Up.  This is by far the most important aspect of gold separation and recovery and includes angle, horizontal leveling, and water flow. Improper sluice angle is probably the most common error most miners make. The old rule of thumb of setting your sluice to “one inch per foot” is just a starting point and can result in too much water velocity. Too much water leads to improper breakdown and separation of heavy concentrates and material moving through the box too quickly, which can mean loss of fine gold. A Sluice Setter Digital Pitch Gauge can help, and so can focusing on water velocity instead of just the angle. Try the “one second per foot” method. Measure 12 inches down your sluice and mark that spot. As you feed material into your sluice using a side-to-side motion, count “one thousand one.”  Your material should be passing the 12 inch mark as you finish that count. If it needs to be faster, increase the rear angle. If it needs to be slower, decrease the rear angle. As material travels down the sluice, be sure you are utilizing the entire capture area. If material is being forced to one side or the other, leaving one side clogged with too much material, while the other side is not processing at all, it could mean the sluice is not properly leveled horizontally.

Material Classification and Processing.  In order to capture small gold in quantity, finer classification is usually necessary, even though it’ll take more time to do so. Processing speed and the volume of material to put into the sluice (by hand or by scoop) must be matched to the volume and velocity of the water. If too much material is introduced into the flow, the water velocity will slow down causing the sluice to back up and lose gold. Gradually add smaller amounts of material to the flow using a wide scoop.

Monitoring Your Sluice.  When using stream flows, you are bound by the characteristics of that waterway—water speed, depth, and the ability to change your sluice angle. Mechanical flow is not limited by nature since you can control it. But no matter who is controlling the water (you or Mother Nature) monitor two factors while running gold-bearing material: how the sluice is processing the material, and the capacity of your sluice. How much can the sluice hold before it loses the ability to separate heavy materials and capture gold? If you see movement of heavy material down the sluice or movement of captured gold, it’s time to remove your sluice from the river, clean it, and reset it. When processing difficult material, set up a regular cleaning schedule so you don’t lose gold.

Applying these three main techniques while sluicing — proper selection and set up, material classification and processing, and monitoring — will allow you to adapt to changing conditions no matter the type or brand of sluice box you prefer. And remember that old saying "practice makes perfect" — using the same gold-bearing paydirt over and over again means you can learn these techniques and tips much quicker and recover more gold!