A sluice box is the tool most prospectors reach for once they've found gold in a pan and want to process more material. It's simple: a channel, some water and something on the bottom to catch the heavy stuff. Getting it to catch fine gold consistently takes a little more know-how. This guide covers how a sluice box works, how to set one up and read the water, what size to buy, and when it's time to move up to a highbanker or power sluice.
Ready to shop? Browse our full sluice boxes and highbankers collection. New to prospecting? Start with our gold panning guide, then come back here.
What Is a Sluice Box?
A sluice box is a long, open channel that uses flowing water to separate gold from sand and gravel. You set it in a creek, shovel material into the upper end, and the current carries the lighter rock and sand out the bottom. Gold is about 19 times heavier than water and roughly 7 times heavier than common sand, so it drops out of the flow and gets trapped by riffles or matting along the floor of the box.
A sluice doesn't give you clean gold. It gives you concentrates: a small amount of heavy black sand, gold and other dense minerals that you finish in a gold pan or a Blue Bowl. The advantage is volume. A person with a shovel and a sluice can run many times more material in a day than they could ever pan by hand.
How Does a Sluice Box Work?
Everything in a sluice comes down to controlling the speed of the water. Fast water carries material; slow water drops it. A sluice is designed to create small pockets of slow, swirling water along the bottom while the main flow above keeps moving.
- The header or flare at the top funnels creek water into the box and spreads your material across the width of the channel.
- Riffles or matting on the floor break up the flow. Behind each riffle, or inside each cell of a mat, the water curls into a small vortex. Heavy particles fall into that low-pressure zone and stay there; light material gets lifted back into the current.
- The slope of the box sets how fast the water moves overall. Too flat and everything settles; too steep and the vortices wash out and take the gold with them.
Modern riffle-less mats like Prospectors Dream Dream Mat are built around this idea. Instead of a few tall riffles, the mat has hundreds of small shaped cells that each create their own vortex, which is why they're so good at holding fine and flour gold.
Riffles, Matting and Miner's Moss
What you put on the floor of the sluice decides what size gold it catches best. Most modern sluices use one or a combination of these:
| Recovery surface | What it is | Best for |
|---|---|---|
| Traditional riffles | Raised bars or angle iron across the channel, often over carpet or expanded metal | Coarse gold and pickers; easy to see and clean |
| Vortex or riffle-less mat | A molded rubber mat with rows of small cells that each form a vortex | Fine and flour gold, with a quick cleanup |
| Miner's moss | A woven vinyl loop mat, like a heavy doormat | Catching fine gold under riffles or at the tail of a box |
| Expanded metal over matting | A diamond mesh that sits on a mat and creates turbulence | Mixed-size gold in higher water flow |
Can you use a sluice box without riffles? You can run a sluice without traditional riffles, but not without some kind of trap. A bare, flat floor will hold almost nothing. Riffle-less sluices work because the mat itself does the job that riffles used to do.
Dream Mat comes in several patterns. Micro mat targets the finest gold, Mini is an all-round pattern and Combo mixes both. Our sluice box collection lists which mat comes in each box, and replacement mats are in the Prospectors Dream collection.
What Size Sluice Box Should I Buy?
Sluice sizes are listed as width by length in inches, so a 6x24 is 6 inches wide and 24 inches long. Width controls how much material the box can process. Length gives fine gold more mat to settle into before it reaches the end.
| Width | Typical use | Who it suits |
|---|---|---|
| 4 inch (4x16 Adventure) | Sampling small creeks, backpacking, testing new ground | Hikers and anyone prospecting far from the truck |
| 6 inch (6x24 up to 6x47) | All-round stream sluicing | One person with a shovel; most first-time buyers |
| 8 to 10 inch | Higher volume in bigger water, or as a highbanker with a pump | Two people shoveling, or a solo prospector on proven ground |
| 12 inch | Production sluicing | Crews, or machine-fed material with strong, steady flow |
The most common mistake is buying a box that's too wide for the water available. A 12 inch sluice in a shallow creek won't get enough flow to carry material, and it will pack up and stop catching gold. Match the box to your water first, then to how much you can shovel.
How to Set Up a Sluice Box
- Find the right spot. Look for a stretch of creek with steady, fairly fast water that's at least as deep as the header, ideally where the stream narrows or drops slightly. Avoid slack water and big eddies.
- Seat the header. Set the top of the box into the current so water flows straight in without spilling around the sides. Use flat rocks to wall off gaps and direct the flow into the flare.
- Set the slope. Start at about 1 inch of drop for every foot of length. A 36 inch sluice would sit about 3 inches lower at the tail than at the head.
- Level it side to side. Water should run evenly across the full width. If it runs heavy on one side, gold will wash out along that edge.
- Anchor it. Place a flat rock on the tail or sides so the box doesn't shift when you start feeding it.
- Run clean water first. Let the box run for a minute with no material. The mat or riffles should be fully covered and the water should flow smoothly with small ripples behind each riffle.
Screening your material through a classifier before it goes in the box is the single biggest upgrade you can make. Rocks bounce through the sluice, disturb the vortices and wash fine gold out. Classified material, usually screened to 1/4 or 1/2 inch, runs more evenly and recovers more fine gold.
Reading the Water: Too Fast, Too Slow or Just Right
Once material is going through, watch the box rather than the shovel. The sluice tells you what it needs.
| What you see | What it means | Fix |
|---|---|---|
| Mat or riffles scoured bare, no black sand anywhere, gravel shooting straight out the end | Running too fast | Lower the head end, or reduce the water by moving the box to slower current |
| Sand and gravel piling up, riffles or mat buried, water spilling over the sides | Running too slow | Raise the head end, add water, or feed material more slowly |
| Material moving steadily, a light line of black sand in the upper riffles or mat, small swirls behind each riffle | Running right | Keep feeding at the same rate |
How much water flow does a sluice box need? Enough to cover the riffles or mat and keep material moving steadily down the box. In practice that means water running at least an inch or two deep over the recovery surface. If you can't get that much depth, a narrower box will work better than a wider one.
It's worth checking your tailings now and then. Pan a sample of the material coming out the end of the sluice. If you see gold, adjust the slope or slow down your feed rate until the tailings come up empty.
How Often to Clean Out a Sluice Box
For most hobby prospectors, a cleanup at the end of each day is plenty. Clean up more often if you're moving a lot of gravel or working heavy black sand, because a mat packed with black sand can't catch new gold as well. Always clean up before moving the box or leaving it overnight.
- Lift the sluice straight up out of the water, keeping it level so nothing slides out, or shut off the pump if you're running a highbanker.
- Carry it to a clean tub or bucket and remove the mat carefully.
- Rinse the mat and the box floor into the tub, flexing the mat to release anything caught in the cells.
- Pour your concentrates into a bucket or bag to take home.
- Finish them with a gold pan, a Blue Bowl or a Gold Cube, and use a snuffer bottle to pick up the fine gold.
For more on separating fine gold from black sand, see our guide to recovering flour gold.
What Is a Highbanker?
A highbanker is a sluice box on legs, fed by a pump instead of the creek's current. Most have a hopper on top with a grizzly screen and a spray bar that washes material through the screen and into the sluice. Because the water is pumped, you can set up on the bank and process gravel from terraces, old channels and bench deposits that a stream sluice can't reach.
What is a power sluice? A power sluice is the same idea without the hopper: a pump feeds water into the head of the box and you shovel material straight in. Many kits, like the Prospectors Dream power sluice and Transformer models, can run either way, so you can add a hopper later.
Sluice Box vs Highbanker vs Power Sluice
| Stream sluice | Power sluice | Highbanker | |
|---|---|---|---|
| Water source | Creek current | Pump | Pump |
| Where you can work | In the creek only | Near a water source | On the bank, away from the water |
| Material volume | Moderate | Higher | Highest |
| Screening | Classify by hand first | Classify by hand first | Built-in hopper and grizzly |
| Weight and setup | Light, quick to set up | Moderate | Heaviest, most setup time |
| Power needed | None | Gas or battery pump | Gas or battery pump |
| Rules | Allowed in the most places | Motorized; more restrictions | Motorized; more restrictions |
Choosing a Highbanker for Small-Scale Gold Mining
The best highbanker for small-scale gold mining is one you can carry to your spot and run all day with the pump you have. A few things to weigh:
- Portability. Ultralight units like the 4x16 Micro Banker pack into a backpack. A 6 inch highbanker is the sweet spot for one person; 8 to 10 inch units suit two people on proven ground.
- Pump match. Wider boxes and bigger hoppers need more water. Check the recommended pump size for the box before you buy, and remember that the pump has to lift water from the creek up to the hopper.
- Hopper and spray bar. A hopper with a good spray bar saves you classifying by hand and keeps rocks out of the sluice.
- Legs and stance. Adjustable legs make it easy to set the slope on uneven ground, and a wider stance adds stability.
- Your local rules. Many areas that allow hand sluicing restrict pumps and motorized equipment, so check before you invest.
You'll find highbankers, power sluice kits, hoppers and leg kits in our sluice boxes and highbankers collection.
Dredge Sluices and Clean-Up Sluices
Dredge edition sluices use mat patterns built for the faster, more turbulent water of a suction dredge. If you plan to run a small dredge or add one later, choose a sluice with a dredge-rated mat.
Clean-up sluices, like The Boss and the Gold Clean Up Buddy, are small recirculating sluices you run at home. They take the concentrates from a day in the field and reduce them down to a small amount you can finish in minutes, without losing fine gold.
Is It Legal to Use a Sluice Box?
In many places, yes, but the rules depend entirely on where you are. Hand tools like pans and small sluices are allowed in many state and federal areas, sometimes with a free permit or limits on box size, while pumps, highbankers and dredges often need a permit or are banned outright. Private land needs the owner's permission, and active mining claims belong to the claim holder.
Before you go, check with the land manager for your spot, such as the state parks or natural resources department, the Bureau of Land Management or the U.S. Forest Service. Our laws and code of ethics page covers the basics of who manages what.
How to Choose Your First Sluice Box
- Sampling and backpacking: a 4x16 Adventure sluice. It weighs next to nothing and tells you whether a creek is worth coming back to.
- Most people starting out: a 6 inch sluice in the 6x24 to 6x42 range with an all-round mat.
- Proven ground and more water: an 8 or 10 inch box, or a power sluice kit you can turn into a highbanker later.
- At home: a clean-up sluice to finish your concentrates.
Add a classifier, a gold pan and a shovel, and you have everything you need for a productive day on the creek. Browse all of our gold prospecting equipment to round out your kit.
Sluice Box FAQ
How much gold can a sluice box catch?
A well-tuned sluice catches most of the gold in the material you feed it, including fine gold with a good mat. How much you actually recover depends on the ground. A sluice can't find gold that isn't there, so test pan a spot first and only start sluicing where you're seeing color.
How much does a sluice box cost?
Small backpack sluices start under $50. Full-size stream sluices with Dream Mat generally run from under $100 to under $200, depending on width and length. Power sluice and highbanker kits start under $200 and run to several hundred dollars, depending on size and whether a pump is included.
What angle should a sluice box be set at?
Start at about 1 inch of drop per foot of length, then adjust by watching the flow. If material piles up, steepen the box; if the mat scours bare, flatten it.
Can you use a sluice box in any creek?
You need enough water depth and current to cover the mat and move material, and you need to be allowed to dig there. Small, fast creeks suit narrow sluices; slow or shallow water may call for a power sluice with a pump instead.
Do I still need a gold pan if I have a sluice?
Yes. You'll use a pan to test spots before you set up, to check your tailings and to finish your concentrates at the end of the day.
