Bear

I don’t read other forums, just this one. Here is me preparing to dredge last summer in the interior of AK. All of the dredging I have done for the last 6 years has been in a cut. I also didn’t dredge two summers ago because I was prospecting with small equipment. The first couple days whooped my @$$ but I got back into it.

Here is the link to the free text book that my school uses for Geology 101 https://opengeology.org/textbook/

Another recent find https://www.foxnews.com/lifestyle/man-finds-7-carat-diamond-arkansas-state-park-names-gem-fiancee

Yes, mostly over 20 years ago. I grew up in Green River and prospected out in the Cedar Mountain area. Last time I was out there about 13 years ago it was a lot harder to pick up indicator minerals.

https://fox59.com/news/national-world/man-finds-4-87-carat-diamond-in-arkansas-state-park-largest-discovery-since-2020/amp/

Recent diamond find at Crater Of Diamonds, AR. https://www.nbcnews.com/news/us-news/7-year-old-girl-finds-large-295-carat-diamond-arkansas-park-rcna104123

If someone else hasn’t, I try to post the links about diamonds found at Crater of Diamonds state park in Arkansas. Never been but would like to go sometime. I do have some diamond prospecting experience though. https://www.foxnews.com/lifestyle/lucky-arkansas-man-finds-3-29-carat-brown-diamond-state-park

It is a sedimentary rock. I think with chert and sandstone too and maybe mud stone. It is bedded with different composition on the layers. Chert is generally from silicosis ooze. It looks like some sole marks, which are a sedimentary structure, in the first picture. Please post a picture of the rock wet on the same surface as the first photo.

Geophysical surveys are an overarching term that encompasses different techniques like mag, gravity, resistivity, conductivity, acoustics and others. Mag surveys are used extensively in prospecting, as others noted, looking for changes in magnetism. Intrusions, dikes, sills, flows, etc, can have a positive or negative signature against the surrounding rock. The signature is from their formation depending on the composition, oxidation state and or magnetic pole reversal. Other types of contacts and alluvial systems can show up as well. I have experience applying different types of surveys to guide geologic mapping and interpretation.

Pictures are hard to identify from and I am no meteorite expert but it looks like a rhyolite crystal tuff or flow. Rhyolite is the volcanic (extrusive) equivalent of granite (igneous). It can vary in color. The phenocrysts (crystals) look like feldspars and quartz. Some appear to be broken, that implies erupted. I don’t see fiamme which are flattened pumice that look like a wispy or flame like structure(s). The real way to tell is if the groundmass is crystalline, it will be very small or aphanatic, meaning no small crystals. Groundmass with small crystals means near surface cooling. No crystals means erupted.

Impact structures are discussed a lot in geology courses. To lengthy to discuss here but the driving forces behind tectonics, including the formation and break up of supercontinents is likely a combination different processes.

This would be the only large scale precious metals mine in Wyoming

This guy has been finding a few diamonds! https://www.foxnews.com/lifestyle/man-finds-35000th-diamond-arkansas-park-his-50th-this-year

I went out in the spring time on an intermittent stream below known diamond bearing structures. Hence the ability to use a highbanker. The structures themselves were all claimed. I also had a 55 gallon stock barrel, that my dad and grandpa made a mount for in the bed of my truck, for various prospecting adventures. The areas I worked had a lot of stones being close to the source.

I have used a highbanker to prospect for diamonds when I lived in WYO. I had varying results recovering indicator minerals and never found anything I thought was a diamond. I have thought about making a recirculating sluice/grease table. A portion of rifles in the top part first for indicator minerals and diamond with a lower section of grease table. From things I have read there are problems with grease tables such as temperate of the water and organic material. To warm the grease mixture washes out. To cold it gets harder and diamonds won’t stick. Organic carbon can cover the entire grease section preventing diamonds from sticking. Also diamonds may not adhere because of stuff coating them. I though about using a hot water heater to maintain the right temp for the water in cooler times of the year. Like mentioned, I would screen off large material above a 1/4 inch and likely everything below 16 mesh, maybe a little smaller, prior to tuning it through.