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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).
Gold nuggets of various sizes have been found throughout the world. Historically, the nuggets are melted down and formed into new objects. The Welcome Stranger is the largest alluvial gold nugget ever found, which had a calculated refined weight of 97.14 kilograms (3,123 ozt). Three of the biggest nuggets come from the Brazilian Serra Pelada mine.
John Eli Perrett (February 9, 1866 or 1868 – February 26, 1943), better known as Potato Creek Johnny, [a] was an American frontiersman and gold miner, best known for having discovered one of the largest gold nuggets ever discovered in the Black Hills in 1929. From then until the end of his life, Potato Creek Johnny became a local celebrity ...
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 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.
Homestake high-grade gold ore, view is about 1.2 cm wide. The gold ore mined at Homestake was considered low grade (less than one ounce per ton), but the body of ore was large. [8] Through 2001, the mine produced 39,800,000 troy ounces (43,700,000 oz; 1,240,000 kg) of gold and 9,000,000 troy ounces (9,870,000 oz; 280,000 kg) of silver.
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.
Granite and granite pegmatite (2545 ± 30 Ma) intrude metasedimentary rock of the Miners Delight Formation in the western part of the greenstone belt. The South Pass pluton is a pegmatitic granite west of South Pass City, and the Sweetwater granite is a fine-to medium-grained leucocratic granite that occurs to the west of the South Pass pluton along the Sweetwater River and Lander Creek.