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Found 36 results

  1. I bought another Michigan copper nugget the other day. I love this kind of stuff. This one goes 235 grams. 7½ ounces feels really nice in your hand
  2. Good article and photos.... https://www.usatoday.com/story/money/2018/02/12/how-one-african-mine-produced-nearly-1-000-carat-diamond-stunner/319678002/
  3. Know your Rocks. This highly desired collectors piece was found by one of my customers with a Fisher Gold Bug-2. If you did not know what to look for you'd probably toss the rock aside thinking "just another iron stone hot rock". When you see a good variety of colors and minerals, its time to slow down. Here is a 1 of a kind tree shape gold specimen or Dagger. Thanks to my customers for sharing your photos of Success with me.
  4. A couple of my finds from this summer, a tube shaped piece filled with quartz and calcite and an ammonite with and without shortwave light Both about 8"
  5. A California woman says she found a 1½ carat diamond while mining gold near the Sierra Nevada foothills town of Foresthill. “I was like ‘Oh, my god, I found a diamond,’ ” said Jillian Kelly. Kelly, 49, left her Silicon Valley career to take up mining 10 years ago and wrote ‘The Miracle Miner: My Life as a Female Gold Miner.” The uncut semi-clear pebble-sized stone is about width of a dainty pinky finger. The rest of the story with photos at The Sacramento Bee
  6. Found a copper ore nodule scanning some mine tailings in n Nevada, 94 on the Deus and very heavy. XRF readings at the local pawn shop were; Fe 1.53%, Zn 27.37%, Sn .632%, Cu 67.68%, Pb 2.37%. Sure wish there was a little Au in there, next time I wish. Or, could this just be a melted fitting buried in the tailing pile way in the desert high on the side of a hill?
  7. Some nice fossils, minerals and gems. http://www.bonhams.com/auctions/24039/?utm_source=bonhams&utm_medium=email&utm_campaign=STS_Lapidary_24039&utm_content=link3
  8. A CONTRIBUTION TO ECONOMIC GEOLOGY (1957) GEM STONES OF THE UNITED STATES By Dorothy M. Schlegel ABSTRACT Many semiprecious, but few precious, gem stones have been found in the United States. Beauty, durability, and rarity are the most important qualities of a precious gem. Gem stones are distinguished by their physical properties: color, crystal form, cleavage, parting, hardness, specific gravity, luster, index of refraction, transparency, and dispersion. Gems are named for their color, type locality, outstanding physical property, or persons. The most popular gem cuts are the cabochon, rose, brilliant, step, and mixed. The carat, one-fifth of a gram or 200 milligrams, is the unit of weight measurement. The color of four popular gems may be changed by heat treatment or dyeing. Only the ruby, sapphire, spinel, emerald, rutile, and quartz of gem quality have been synthesized. The best quality of assembled stones are the doublet and triplet. Most gem stones are found in alluvial gravels and igneous rocks, especially granite and pegmatite deposits. INTRODUCTION Gem stones generally are divided into two categories: precious and semiprecious. A precious gem stone has beauty, durability, and rarity, whereas a semiprecious gem stone has only one or two of these qualities. The diamond, emerald, ruby, and sapphire are considered precious gems. Some opal is precious, but most varieties are semiprecious. The beauty of a gem stone is determined by personal taste. In ancient times man preferred brightly colored, translucent or opaque stones. Today he prefers evenly tinted, transparent stones. The desired hues are blue, rose, green, and true canary yellow in the diamond; pigeon-blood red in the ruby; cornflower blue in the sapphire; and grass green in the emerald. Most diamonds, however, are colorless. The durability of a gem stone depends upon its hardness and lack of ready cleavage. A gem must be sufficiently hard to resist abrasion by objects normally found in everyday life and by dust. It should also resist the chemicals with which it comes in contact. Cleavability is the tendency of certain gems to split in one direction more readily than in another. Rarity is one of the most important factors in establishing the price of a gem stone. Such gems as the diamond and ruby are rare, in addition to being beautiful and durable, and therefore are very expensive. Although the deep red pyrope garnet closely resembles the ruby in color, there is no comparison in expense and popularity. The purpose of this report is to give the amateur gemmologist some of the important information available on the gem stones of the United States. Although the finest precious gems occur in foreign countries, a wide variety of semiprecious stones, and a few precious gems, have been found in the United States. About 50 major gems and the geology of their occurrence are described in this report. William F. Foshag, U. S. National Museum, has kindly reviewed the manuscript and made many valuable suggestions. Dana's "A textbook of mineralogy" is the source of the chemical formulas. Full text PDF here
  9. "A rare diamond known as the Pink Star has been sold in Hong Kong for more than $71m (£57m), setting a new world record for any gemstone at auction. The oval-shaped 59.6 carat stone was bought after just five minutes' bidding at Sotheby's, reports said. It is the largest polished diamond in its class to go under the hammer. It sold for $83m in Geneva in 2013 but the buyer later defaulted. The record until now was held by the Oppenheimer Blue, which sold for $50m last May." Details and photos here.
  10. Can you recommend any places that would be good in Alaska. I think copper is much prettier than any other metal, having a few nuggets to put in the display would be neat! Years ago I found a small copper nugget about the size of a 22 bullet at Matanuska glacier, sure liked that little nugget. Ended up putting it in a small vial of gold, Sometime later I sold a spiral panner to a lady with a handicapped son. He really liked prospecting and she thought it was really helping him with his disability. She told me they were not having good luck finding gold and didn't know the difference between gold and fools gold. Well I marched rite into the house grabbed a vile of gold and gave it to her! She really appreciated that and I felt good about myself until I realized that 1/4 oz of gold also had that little copper nugget in it. Still irritated about that!
  11. Many years ago I bought this 105 grammer on ebay and it came out of the United States. I don`t know if this nugget is natural or tumbled and the glossy side has never dulled so I guess its got some kind of varnish on it. I`ve also got a 16 ouncer somewhere in the house that is all jagged and rough with green bits all over it. Does anybody detect for copper in the States, does copper only come out of mines, or can copper just be lying around on the ground? cheers Dave
  12. New Treasure Talk blog by Chris Ralph... Detecting for Natural Metallic Silver
  13. Just thought I'd share this with everyone. I always like gold in quartz, but I really think it's neat to see gold in host material that isn't what you might expect to find it in. The black piece is from Arizona.
  14. Strange Rock

    Found this in large wash gravel from a pit ? any ideas it is solid rock looks like calcium deposits in holes looks like tool marks ?
  15. "A giant jade stone weighing 175 tonnes has been uncovered by miners in Myanmar. The stone is 4.3m (14ft) high and 5.8m (19ft) long, and is reportedly worth an estimated $170m (£140m)." More including photos at http://www.bbc.com/news/world-asia-37670305
  16. i attended the wedding of one of my grand-daughters at Turner falls, Oklahoma. So, in order to get some prospecting fun into the trip we drove 250 miles to Murfreesboro, Arkansas. The Crater is a few miles from town and has produced thousands of diamonds to the diligent and the lucky. Not being either of those types a I went and played anyway. here are some pics fred
  17. This isn't about gold and I know this is a gold oriented forum but there are a few geologists and miners with a lot of experience in many things so maybe someone can help... My question is, how exactly do you go about mining and seperating a material like vein jade without destroying it? Seems like with blasting you risk blasting the vein apart too. Even if I did blast and broke the diabase into manageable cobble sizes that I could remove and process, how would I remove the actual vein itself without destroying the jade? A little backstory, one of the minerals I'm prospecting for is jade and I've found some veins (nothing economic or gem quality yet) finally so I think I'm on track to finding something better and potentially worth mining. But it got me thinking - with ore mining you can just blast it apart since it's being crushed anyways. But with something like jade where the vein is in place in rock and you want to keep the gem material as intact as possible, what would be the best method for mining and extraction? I have finally located a few veins, they are low quality material not worth mining and far too slim anyways. But even if these veins were good material I'm not sure I see a good way to remove it. I tried chiseling with very little luck. The veins are in either basalt or diabase and the rock is very hard and durable and the jade doesn't want to seperate easily. Most jade mined or even just collected by hobbyists is float in alluvium it seems like, so I'm not finding much useful info online on how to approach this. I'm attaching a photo of a small vein I found as an example, it's only 1/2" wide and low quality olive jade so not worth mining, but this is still the same rock and material I'd need to mine and work. Also here is some gemmy good deep green material I just cut off a boulder I found. This is Wyoming nephrite, it was float but still had vein material attached so I think I'm getting close.
  18. Went to the local gem and mineral show a couple weeks ago and picked up some nice ore samples. One of the items going cheap was peacock ore, which Wikipedia says is the common name for the mineral bornite. According to them it has a specific gravity of ~5 and a chemical composition of Cu(5)Fe(1)S(4). My White's TDI PI detects a 74g sample at 10 inches in air. That's one hot rock! I suppose this could be a real payoff for copper if found in quantity. But for gold nugget hunters it's got to be a sting no matter where it jabs. Anyone found this while out hunting?
  19. Just returned from a few days WAY up north near Happy Camp, CA. We weren't detecting but looking for something valuable never the less. I've heard about what's referred to as "Happy Camp jade" since high school but never went looking for it. Finally got a local guide who took me and Miner John up into the mountains near Indian Creek to find some. And find some we did! Actually found a lot more than the pictures here but some of the pieces were literally boulders and too heavy to pack out. A little research shows this is officially called Californite, not a "true" jade, but a variation because of it's unique colorations. We were told on the other side of the creek from where we were is a huge boulder with spider webs of gold incased in it, but the water was too high right now to reach it. So, a fall trip is planned. Anyway, if interested, do a quick Google search for it. Very cool stuff. Going to cut and polish a bit of it later to show it off. Digger Bob
  20. I have a chance to go hunt for geodes in the Keokuk,Iowa/ Hamilton,Illinois area this weekend. Supposedly this is one of the best areas in the world to find the better geodes. Some even have oil in them I heard. How do I tell the ones with the larger hollows before breaking them open? Anybody got tips and tricks for geode hunting? How to break them open the gentle way? I hear they are in creeks and gray shale deposits in ravines. Thanks.
  21. "Lesedi la Rona," the largest gem-quality rough diamond discovered in more than 100 years, will be auctioned in London next month and is expected to sell for $70 million, international auction house Sotheby'ssaid on Wednesday. Ahead of the auction on June 29, the 1,190-carat diamond, its name in Botswana's Tswana language translates as "Our Light," was on display at Sotheby's New York headquarters. http://www.cnbc.com/2016/05/04/worlds-biggest-diamond-to-be-auctioned-in-london.html
  22. Hey folks, just throwing this out to some who maybe struggling with this topic of crystalline growth patterns and terms. I know many of you like myself enjoy the detecting gold. Over the years I am sure some of you have collected and added a number of nice specimens to your collection. My question is how do you determine what you have? If you look at some of the high end mineral dealers web sites and the high price they ask for some rare specimens, I believe its important for use "field collectors" of this mineral to educate ourselves in identification of crystalline forms and their potential value. The thought of anyone of us letting go a beautiful rare specimen for spot is not a pleasant one. So as it rains, snows and the weather keeps me indoors, I am studying this topic. I do have to admit, I feel like am in school all over again.... time for coffee! If any one has any thoughts, or good resources for the layman please add to our knowledge. Thanks and good hunting to you all this year.