Placers that are usually found at Bedrock 

These types of placers are usually always permanent ones.

Crevices
Out of all the different kinds of deposits of gold that can be located and worthwhile, bedrock crevices have proven to be some of the best. In this case we will describe a crevice that looks like a tear, crack or split on the bedrock. The crevice is only supposed to be a few inches deep and should be several feet long. These cannot be foreseen. There are crevices that run parallel to the current of the stream while there are others that run at angles and there are also deviations of angle between the ones just mentioned.

No matter what way they run with the current, these are probably the most efficient of the stream’s natural riffles. There are a lot of ways in which crevices are formed but two of the most common are the contact point between where two geological formations come together and the split of the bedrock as it is eroded. There is a definite way of being able to find a bedrock crevice from above the water level though. This can be done by watching the sides of the stream and observing if a split in the rocks continues on in the stream. These crevices can be worked out from the side of the stream down to the bedrock and in many cases followed for some distance without having to get rid of or take care of a great amount of gravel.

The crevices that are more productive are in many cases well hidden underneath a thick bed load and are not reached by the average dredge operator that is unless the person decides to remove the bed load if it has been decided that it has enough gold in it and dredging is agreed on. In a lot of occasions when a person is working a bigger area of a stream to bedrock he or she will dredge and but will not closely investigate the bedrock itself when getting to it.

If you are going to bedrock it is always suggested to put a little bit more into the intake nozzle a few inches away from the bedrock, even in cases where it seems there is not a crevice in this area.

In many occasions bedrock has little depressions and small crevices that will show up and will only be a teensy scratch on the surface. These teensy crevices are easy to then vacuum out from the bottom. It is additionally a good idea to remember that a crevice that is an eight of an inch wide and half an inch deep and a foot long may have more gold inside of it than various yards of bed gravel.