Hey MoonRakerSCM,
Klondike here.....
A long, long tie ago...back in the days of being a weekend warrior.... I spent a lot of time on Cajon Creek....
The bed rock is deep.. way to deep to recreational use to reach and most of the area is closed to that kind of mechanical means.....
But... looking across the canyon while drive up or down, (down is better...south) on I-15...past the gas station about a mile or so... you'll see some greenish or blueish rock walls...on the far wall where the rail road tracks are...they are very noticeable with a sharp contrast against the brown contact zone of the rest of the canyon... That blueish area is the narrows... that blue / green rock is much harder than the rest of the canyon.... and the bed rock is somewhat shallow and you'll find some gold there... you won't get rich but your 10 friends will lots of small fry friends...
Further up the canyon towards the desert.. you'll lots of sand stone rocks turned on end and slanted upwards.. these are the "Mormon Rocks".. a common land mark on the Southern branch of the California Tail during the gold rush... who knows what one might find in the area, if you spent enough time looking......
This is also part of the San Andreas Fault Zone.... thus all the torn up mountains and slanted rocks...it is a very interesting pace to study for geology and historical purposes...
Half way in the canyon, take the road to Silver lake. at the first dry creek.. sample the ribs of the culverts under the road... I have also found some gold there too...
Good luck to you...
Klondike...
