Keene Engineering, Inc.

I just ran across this video and Wow how cool is this. Check this out you will enjoy it.

A52S Highbanker 2.5" dredge. Awesome day! Thank you Mark Keene for you help!

This is a quick video of the 4" ultra dredge with the latest upgrade "slow flow recovery system". Very simple and basic we remove the last 1/3rd of the all the riffles and lay in some expanded metal. We then place a 1/4" heavy gauge woven wire roughly 1" above and this does 4 things for fine gold recovery. 1. The 1/4" wove wire slows the water flow underneath less than have the speed allowing the flour gold to fall out of suspension. 2. The heavy gauge wire is round and r...ough so it creates in own riffle action. It caused the water to stall out the fines to fall through into a slower flow of water. 3. The elevated woven wire eliminates any effect that the larger material and rock on the riffle below. 4. Also for decades we have been trying to build a better sluice box the one thing we have been missing is not to do this in the beginning of the sluice due to all the chaos in the beginning of the sluice. If you give the flows a chance to become linear and zone out your recovery system become much more effective. I love this little 4" dredge Ulta. It is light compact dredge moves a lot of material for it size. I love it since it fits in the back of my Jeep. See more

We made a few more change in the secondary sluice box. We had a little lift in the screens so we added some additional supports.

"Pumpinstine " the neighbor nick name. These pictures are from a customer that wanted to rebuild his beaches. He estimates that he averaged around 15 yards per hour. He used a 4" suction system with a 5" discharge and a 23 hp with a P350S pump.

Really cool piece of equipment

This is a quick video of a good customer Dan made for us on a 160 Dry Washer being powered by a Makita blower. The blower worked amazingly well. It is quiet, light weight and the run time was around 1 hour. This is a great option if you are working in areas that do not allow gas motors and maintain a low profile.

The Keene A52S sluice box in action working up on the Yuba River on Patricks Yuba Bash 2020

These are a few pictures of the latest upgrades on the A22 and A23 gold suction guns.

This is a quick video we made up on the A22 and A23 gold suciton gun. This all started because we made a slight design improvement on smaller A22 gold suction gun. The new design make the smaller A22 slightly longer providing greater suciton and longer sucition duration.

Every one is back from the 2020 Keene Bash up on the N Fork of the Yuba river below Downiville Ca. Every one had a great time with some beutifull country and great freinds and good gold as well.

This is our latest video on the Keene Fire Fighting system. We go through a basic setup, basic operation and shutting it down for storage. https://youtu.be/kVCfhyP3lEw

This is a really cool water recirculation system for a Mini Max

These are a few pictures of 4" ultra and the new 5/6" ultra sluice with the slow flow recovery system. The slow flow is a very simple but effective sluice box. When you place a section of heavy gauge woven wire over a low-speed riffle the recovery is amazing. When passing water over a woven wire the heavies fall through quickly and the large diameter wire acts like a mini riffle stalling the water speed. Let take a high powered 5" dredge with water entering the sluice at 1...0 feet per second. The water under a 1/2" woven wire will drop the speed approximately 20% a 3/8" woven will drop the speed 35% slower a 1/4" woven will slow the material 50%. So we all know that a flour gold is very difficult to capture at higher speed water flows. We all know that when dredging the, rock passing over the riffle board will effect the recovery of riffle no matter what kind of riffle. So the slow flow accomplishes three things. 1. The 1/4" heave woven wire drops the water speed in half and allows the gold to drop out of suspension. 2. The woven wire is placed above the small riffle so that the larger rocks will not alter or distort the recovery system. 3. We place the fine gold recovery system at the end of the box when all chaos has calmed down the water flows are more linear the best placed for flower gold recovery. See more

This is some gold found in the 4" ultra dredge with the slow flow system. Norms dredge needed a little fine-tuning and now look what kind of fine gold he is finding.

This gold was found with a new prototype 5/6" dredge with a new slow flow sluice box and a newly updated dredge frame as well. The Keene 5" shown in the picture produced close to 13 ounces or over a pound of gold this summer. Not bad for a few months of work. Vick loved the new sluice box with the new slow flow recovery system plus the simplicity of the system kept things greif free with quick and easy clean-ups. What a amazing haul and they had a great time as well. I remember summers like this back before the B/S dredging band in Ca. I will be posted more pictures later as well

This is some gold from North Carolina that a buddy of mine sent me. I believe it was found with a 4" Ultra.

This is the first of two fully camouflaged Mini max units painted by Pat. This is a great way to stay low profile and silent so others don't know where your Hot Spot is. This is not available from the factory but, shows what somebody can do to stay invisible as you work in the gold fields. the pump and hoses are also camo. Looking forward to some awesome prospecting. Camo dog not included!

This is just a short story. Mining is all about having adventures and adds to the camping, hiking, fishing, off-roading, etc. experience. Can you please do me a favor and tell Pat Thank You. My father is 82 and I am 58 and we both have issues getting around. Both a Handicapped due to injuries from the wars. But we got the gold bug and called Pat for information on equipment. The items he suggested have worked out so well we are going to the hills n2-3 times a week and having a blast. Pat brought us back outside and loving life again instead of a couch potato.

Choosing the Best Mining Equipment For YOU! By David Knowlen I’ve sold mining equipment for nearly twenty-five years and have seen way too many enthusiastic people come into our store, make a major purchase, only later to discover that they chose the wrong equipment. I’m not referring to the occasional weekend prospector whose primary recovery tools are a shovel, a gold pan and a bucket. This is about people who likely had caught a case of gold fever and decided...Continue reading