by RiverGold » Sun Mar 07, 2010 9:54 am
Is it gold or is it a free copper nugget? I remember seeing something bigger than this a couple of years ago that was briefly touted as an enormous gold nugget, but it turned out to be almost all copper with only a tiny amount of gold in it, as you might find in many good copper mines. This is just a guess, but I am basing it on these things:
1. The audio on the clip has a very tinny sound to it when the metal is struck. Silver and copper have distintive tones to them when they are struck or bounced off of something. They have a certain frequency to them and, in the case of silver, it can be useful in detecting counterfeits. The audio has a more tin-like sound, like copper. Gold tends to have a dull "thunk" sound. It is very maleable and seems to absorb sound when hit. The one in the video has a tinny "ring" to it.
2. They are working very hard at chiseling through these nuggets. The material seems much harder than gold, which is very maleable. It is reacting to the chiseling more like copper, which is a relatively tougher material and used to make tools and weapons in ancient times.
3. Copper nuggets, unlike gold nuggets, are not enormously valuable beyond their melt value. They bring a slight premium for rock shops, but most serious mineral collectors do not get too excited about copper nuggets because they are relatively common. The gold values of a copper nugget containing low percentages of gold do not go much beyond the refinery value when melted and separated.
4. If they had real gold nuggets this size, you would probably see some armed guards around and they would probably be much more secretive about this activity and not posting it on U tube.
5. The color looks like gold, but copper nuggets, like gold nuggets, are seldom 100% pure. Other minerals like silver or nickel can impart a more gold-like color to copper.
The only thing I see contrary to my theory is that these nuggets seems to show wear patterns similar to gold. Copper nuggets tend to have a more sandy, grainy texture. But, under the right conditions, they can probably show a smooth-surfaced wear similar to gold. I would be curious to see what any mineral collectors on the forum think about this possibility.
Randy (formerly RivermanCO)