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A 2007 study on Australian nuggets ruled out speculative theories of supergene formation via in-situ precipitation, cold welding of smaller particles, or bacterial concentration, since crystal structures of all of the nuggets examined proved they were originally formed at high temperature deep underground (i.e., they were of hypogene origin).
A 2007 study of Australian nuggets ruled out speculative theories of supergene formation via in-situ precipitation, cold welding of smaller particles, or bacterial concentration, since the crystal structures of all nuggets examined proved they were originally formed at high temperature deep underground (i.e., they were of hypogene origin).
The same year, the original nugget was moved to a safe deposit box over theft concerns and a replica was put on display in its place. [6] In 2014, a secure case was installed in the museum so the original could be placed on permanent display. [5] [7] The authenticity of Potato Creek Johnny's gold nugget has been the subject of debate.
The Ruby–Poorman mining district in the U.S. state of Alaska produced nearly a half million ounces of gold, all from placer mines. Some of the largest gold nuggets found in Alaska are from the district, which lies along the Yukon River. [1] The placers are mostly deeply buried, and most were originally worked with shafts and drifts.
Crystals of gold are found in cavities in softer minerals such as iron oxides, where they have pushed aside the enclosing material as they grew. Gold crystallises in the cubic system, and perhaps the most common variety is the eight-sided octahedron , [ 2 ] of which the Latrobe Nugget is a good example.
Placer mining is an important source of gold, and was the main technique used in the early years of many gold rushes, including the California Gold Rush. Types of placer deposits include alluvium, eluvium, beach placers, aeolian placers and paleo-placers. [2] Placer materials must be both dense and resistant to weathering processes. To ...
The zone contains hundreds of mines and prospects, including some of the best-known historic mines of the gold-rush era. Individual gold deposits within the Mother Lode are gold-bearing quartz veins up to 15 metres (49 ft) thick and a few thousand feet long. The California Mother Lode was one of the most productive gold-producing districts in ...
The Blanche Barkly was a gold nugget found in Kingower, Victoria, named for the daughter of the governor of the colony at the time. [1] Weighing 1743 oz (49.4 kg), it was discovered on August 27, 1857 at a depth of 13 feet (3.96 m) by Samuel & Charles Napier and Robert & James Ambrose. [2]