nvchris Posted January 3, 2009 Report Share Posted January 3, 2009 Hi AllI'm having a contest to introduce my website. Prize is a HipStick. Guess the gold content in grams of this softball sized specie to win.Visit My Website http://detectoraid.com email your guess to enter at [email protected]. Contest runs till we have a winner.1 guess per week. enjoy todaynvchris Quote Link to comment Share on other sites More sharing options...
Nuggetslayer Posted January 4, 2009 Report Share Posted January 4, 2009 I tried but it wouldn't let me so I'm going to guess 66 grams Quote Link to comment Share on other sites More sharing options...
nvchris Posted January 19, 2009 Author Report Share Posted January 19, 2009 Thanks for all the kind words and taking the time to enter the contest. Had I thought things out I would have put a time limit on it and made it the closest guess without going over, heck I can do that now:) The winner is Jim P. who "cheated" and remembered the post I made in the NS classifieds. He guessed 3.5 troy or 108.85 grams. The actual weight is 3.8 troy or 118.18 grams Congratulations Jim!The Story as told by the finder, paraphrased from Treasure Found magazine. Spring, 1992 Vol. 16 No. 1The Speci was found by the late Hoss Blackman using a Minelab FT 16000 fitted with a elliptical coil. Hoss was hunting near the Devils Nest Mine one of the New West Prospectors club claims. (now known as The 24k) with Gary Hunnington a friend from Buhl Idaho. A few days before Hoss found a 11.6 gram speci that was the biggest he found in the 4 years he'd been swinging a detector.Hoss returned to a spot on a push that had produced over 50 nuggets in the past 3 months. As he was working a lady that he had just met that morning came and sat on a berm to watch telling Hoss that she wanted to "see how the pros do it" When he had gone another 8 feet he got a signal that "just about blew my ears off" Hoss said he thought it was a beer can or a dozer digging down about 10 " he saw a bit of quartz between two decomposing granite boulders. After freeing it Hoss washed it off in a puddle then hid it under a tuft of grass. Calling down Gary who was working higher up the hill asking him to check the tuft of grass. Hoss bent down and pulled the speci out of the grass and handed it to Gary, he muttered "I'll be go to heck" Hoss headed home to Apache Junction and stopped at a grocery store for something to fix for dinner and put the thing on the produce scale. It tipped the scale at just about a pound. The next day Hoss took it to the Arizona Bureau of Mines where a specific gravity test was preformed. Hoss then sold the speci to Down Under Treasures where it was used in print promoting Minelab.Appraised in 1992 for $4300. Today it might be worth quite a bit more. As specimens this size and quality from Rich Hill are rare and very collectable. Larger ones have been found but most have made there way to refiners. I've preformed the same test on it to verify the published reports. How I came by it is another story nvchris Quote Link to comment Share on other sites More sharing options...
matt Posted January 19, 2009 Report Share Posted January 19, 2009 nvchris,I am just curious, but what is the total weight of the specimen? What formula did you use for the specific gravity test? Thanks for the contest. Take care.Cheers,matt Quote Link to comment Share on other sites More sharing options...
nvchris Posted January 19, 2009 Author Report Share Posted January 19, 2009 Hope this helps:) the speci is just under a pound. info stolen from the web!The Specific Gravity Test (used to calculate the gold content of gold nuggets that contain a mixture of gold and other materials) In this example of the specific gravity test, we use gold mixed with quartz. Simply put, the formula is 3.1 x the weight in water, minus 1.9 x the weight in air:Wet nugget weighs 74.5 grams x 3.1 = 230.95Dry nugget weighs 96 grams x 1.9 = 182.4230.95 - 182.4 = 48.5531.1 = number of grams per ounce48.55 / 31.1 = 1.56 ounces of goldOriginal dry weight = 96 grams / 31.1 = 3.08 ounces.Subtract the difference between the wet and the dry: 3.08 ounces - 1.56 ounces = 1.52 ounces.Therefore what is left is 1.52 ounces of quartz."Wet" = weight in water - Put container of water (enough water to cover nugget) on scale. Tare (zero) out scale. Hang nugget by string in water. Note weight.The specific gravity for gold is 19.3.The specific gravity for quartz is 2.65.The ratio between gold and quartz is 7.28 X.Two formulas for the weight of gold (or first mineral) are given below corresponding to the two methods above. All the weight measurements must be in the same units, i.e. all in grams or all in ounces or all in some other unit.Wg = (Wsa * A) - (Ww * A * where A = Sg / (Sg - So) and B = Sowith Wg being the weight of gold in the sample,Sg is the specific gravity of the gold (or the first mineral) andSo is the specific gravity of the second mineralWg = Wsa * A * (1 - + (Wsw * A * .with A and B as defined above.Both formulas above are related by the fact that the weight of the sample in air is equal to the weight of the sample in water plus the weight of the displaced water, Wsa = Wsw + Ww. The specific gravity of a single mineral is Wsa / Ww which is the same as Wsa / (Wsa - Wsw)Properties of Gold and Selected MineralsSorted AlphabeticallyName Specific Gravity HardnessArsenopyrite 6-6.2 5.5-6Calcite 2.7 2.5-3Chalcopyrite 4.1-4.3 3.5-4Chromite 4.6 5.5Cinnabar 8.10 2.5Copper 8.9 2.5-3Epidote 3.3-3.6 6-7Feldspar 2.4-2.8 5.5-6.5Galena 7.4-7.6 2.5Garnet 3.5-4.3 6.5-7.5Gold 15.6-19.3(19.3 when pure) 2.5-3Hematite 4.9-5.3 5-6.5Ilemenite 4.5-4.7 5-6Lead 11.3 1-2Limonite 2.7-4.3 4-5.5Magnetite 4.9-5.2 5.5-6.5Marcasite 4.89 6-6.5Mercury 13.6 liquidMica 2.7-3.4 2-3Monazite 4.6-5.4 5-5.5Olivine 3.2-4.3 6.5-7Platinum 14-19 4-4.5Pyrite 4.9-5.2 6-6.5Pyroxene 3.2-3.9 5-7Quartz 2.65 7Rutile 4.2-4.3 6-6.5Scheelite 5.9-6.1 4.5-5Silver 10-12(10.5 when pure) 2.5-3Tourmaline 3.0-3.25 7-7.5Wolframite 7.0-7.5 4-4.5Zircon 4.6-4.7 7.5Sorted by Specific GravityName Specific Gravity HardnessGold 15.6-19.3(19.3 when pure) 2.5-3Platinum 14-19 4-4.5Mercury 13.6 liquidLead 11.3 1-2Silver 10-12(10.5 when pure) 2.5-3Copper 8.9 2.5-3Cinnabar 8.10 2.5Galena 7.4-7.6 2.5Wolframite 7.0-7.5 4-4.5Arsenopyrite 6-6.2 5.5-6Scheelite 5.9-6.1 4.5-5Monazite 4.6-5.4 5-5.5Hematite 4.9-5.3 5-6.5Magnetite 4.9-5.2 5.5-6.5Pyrite 4.9-5.2 6-6.5Marcasite 4.89 6-6.5Zircon 4.6-4.7 7.5Ilemenite 4.5-4.7 5-6Chromite 4.6 5.5Rutile 4.2-4.3 6-6.5Chalcopyrite 4.1-4.3 3.5-4Garnet 3.5-4.3 6.5-7.5Olivine 3.2-4.3 6.5-7Limonite 2.7-4.3 4-5.5Pyroxene 3.2-3.9 5-7Epidote 3.3-3.6 6-7Mica 2.7-3.4 2-3Tourmaline 3.0-3.25 7-7.5Feldspar 2.4-2.8 5.5-6.5Calcite 2.7 2.5-3Quartz 2.65 7 Quote Link to comment Share on other sites More sharing options...
matt Posted January 19, 2009 Report Share Posted January 19, 2009 Thanks for the info Chris. I think that the specie should be suspended by a string from the scale and the water brought up from below it so that the specie is "suspended" in the water when weighed. Thanks again for the contest and the info. That is a beautiful specimen. Hope to see you in the field some time. Cheers,matt Quote Link to comment Share on other sites More sharing options...
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