How to Build a Sluice Box: The 7 Things You Need to Do It …
Lay down the ribbed mat as you first layer in the sluice. Extend it to the bottom tip of the flare but leave ¼ of the bottom part of the sluice empty. Lay down the second layer, which is the miner's moss. This should be slightly shorter than the ribbed mat and placed at the center of the ribbed mat.