Gold Sulfide, With Precious Metal, From My Allegheny East Mine : Rock #9 For Sale
Hello. This is a very high quality gold sulfide specimen from my mine (Allegheny East in NW Nevada). There is enough precious metal in this sample that, as you can see from the video, my metal detector (Falcon) sounds a positive. A little more about gold sulfide (pyrite): the mineral is mostly iron and sulfur. In it's formation precious metals replace some of the iron. Depending upon the quality of the mineral, up to 20% of the matrix can be precious. I estimate that conservatively my material runs around 7%: of which 60% is silver, 40% gold (the last figures taken from a fire assay). There is also copper in the material, and that is what gives my samples an overall greenish tint. Gold comes in two forms: free mill (ie, nuggets, flakes, and micro chips), and sulfide; where it is bound in a matrix of a sulfur bearing ore. Even with advanced technology, refractory gold in sulfur is hard to recover. The general process is to crush the material as small as possible, burn off the sulfur (roasting), and then process this with cyanide skimming. Should you choose to crush this rock, cook it over a fire (don't breath the fumes) and then pan the remains, you would lose more precious ore than you would recover. This is because the particles of gold and silver are so micro small that they bind to the other minerals and you lose much of your work. The samples I offer have a much higher gold/silver content than usual--so they easily sound with the metal detector. But the particles of gold and silver within the matrix are still very small. (It's just that there is much more of them). However, even being refractory, the old mines here in Nevada during the 1920's and 30's were able to make a profit from a recovery process that lost an appreciable amount of precious ore when gold and silver prices were very low. I have ordered gold sulfide on before, and never has any sample sounded positive with my metal detector. The sample here is fairly typical of higher quality gold sulfide found from the Olinghouse, Jessup, and Sand Springs mining districts of NW Nevada. About this rock: the ore presents itself visually both sides, but is especially strong on one side. It is more speckled in nature than many of our other specimens. There is quartz lattice on the rock as well as copper carbonate on the back side. This is one of our most colorful samples. (The detector does not pick up the copper carbonate). The detector gives its highest reading all the way around this rock. I try and price my specimens reasonably, especially taking into account that the gold inside these samples is refractory. If you have specific wishes on buying, or general questions, let me know! Should you not like your purchased sample, also let me know and we can work something out . . . Regards! B.
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Gold Sulfide, With Precious Metal, From My Allegheny East Mine : Rock #9: $45