A while ago, I did some scouting out at Cache Creek, up near Granite, CO. I brought my Garrett AT Gold Pro metal detector because it allows me to cover a lot of ground quickly. I'm old, so the less unnecessary digging I do, the better.
I focused on areas that were not already being hit hard by local prospectors. There is an area there called "The War Zone" because of all the prospecting pits that look like bomb craters. I wanted to avoid that area.
I found an area that looked good to me. It was quite rocky with a lot of old river rocks. The metal detector sounded on two rocks, so I threw them in my bucket, then dug up about half of a five-gallon bucket worth of rocks and gravel to sample later.
The testing on the rocks, I explained over in the Metal Detecting thread (with pics).
https://www.susans.org/index.php?topic=251912.msg2319794#msg2319794Today, my job was to screen all the dirt and rocks to eliminate the junk so I can focus on the paydirt. My set of screens goes from 2-mesh down to 100-mesh. #2 mesh means there are two holes per inch in the screen, so each hole is about 1/2" in size. It isn't exact due to the width of the wire, but it is close. Thus, a #4 mesh is 1/4" holes, #8 is 1/8" holes, and so on.
I screened everything through the #2 and #4 to get rid of the biggest rocks, leaving just river gravel. The next job was crushing the rocks. I use a 3-lb "Persuader" (machinist hammer) to break them into small enough pieces that they will fit into my small rock crusher. That took quite some time to go from this:
🔗 [Link: flic.kr/p/2rLuf1R/]To this:
🔗 [Link: flic.kr/p/2rLuf1W/]Then I continue screening all of the dirt down to 100-mesh size, which is very tiny.
I first check the screen to see if I can see any gold that I can pull out with tweezers. Then I pan that material to be certain that I did not miss any.
I found nothing of value in the #8 mesh screen.
I found a few colors in the #12 mesh screen, and some got past me, but I caught them when I panned that material.
🔗 [Link: flic.kr/p/2rLsZdy/]
🔗 [Link: flic.kr/p/2rLuf2h/]
🔗 [Link: flic.kr/p/2rLuf1L/]The same thing happened with the #20 mesh screen.
🔗 [Link: flic.kr/p/2rLtVoQ/]
🔗 [Link: flic.kr/p/2rLuvoa/]
🔗 [Link: flic.kr/p/2rLotcA/]The #50 mesh screen is getting pretty small, so I don't bother looking for "pickers". I just dump it in the gold pan and get it that way.
🔗 [Link: flic.kr/p/2rLsZe5/]Then the #100 mesh material.
🔗 [Link: flic.kr/p/2rLtVp1/]There was some Minus-100 material (gold that fell through the #100 mesh screen without getting caught), but it is so small, and the water in the pan was too murky to get a pic.
Now the only question is how much is there? Tomorrow, I'll dump it all in the gold pan and clean out the little bit of black sand, dry it out, and weigh it.
Stay tuned.