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Blue Lake is an abandoned, waterfilled alluvial goldmine pit in Central Otago, New Zealand. Alluvial gold mining is generally considered to be chemically benign, unless mercury is added to assist gold separation. The major element, trace metal and isotopic composition of the pit lake was compared to nearby, unaffected streams.
The Otago Gold Rush (often called the Central Otago Gold Rush) was a gold rush that occurred during the 1860s in Central Otago, New was the country''s biggest gold strike, and led to a rapid influx of foreign miners to the area many of them veterans of other hunts for the precious metal in California and Victoria, Australia.. The rush started at Gabriel''s Gully but spread
Mar 10, 2016#0183;#32;Plans for a largescale alluvial gold mine near Roxburgh have unearthed more opposition than support at the early stage of the planning process. Alluvial gold mine less than popular | Otago Daily Times
Then came the big Otago rush of 1861 and ended when Waiuta closed in 1953. The principal New Zealand goldfields were Coromandel, Nelson/Marlborough, Central Otago and West Coast. The two main types of gold mine were: ''hard rock'' quartz mines, and; alluvial mining which included panning and cradling, sluicing and dredging.
Jul 18, 2012#0183;#32;One mining operation is in full swing; another, less than a minute''s drive away, is to begin this week, and a third, almost between the two, is expected to begin later this year. The claims are on private farmland but are run by Glass Earth Gold, primarily a hardrock exploration company which has turned to alluvial mining.
Aug 23, 2016#0183;#32;Local journalism matters now more than ever. As the Covid19 pandemic brings the world into uncharted waters, Otago Daily Times reporters and photographers continue to bring you the stories that matter. For more than 158 years our journalists have provided readers with local news you can trust. This is more important now than
Although they found alluvial gold, there were no large deposits. The West Coast of the South Island was the secondrichest goldbearing area of New Zealand after Otago, and gold was discovered in 18656 at Okarito, Bruce Bay, around Charleston and along the Grey River. Miners were attracted from Victoria, Australia where the gold rush was near an end. In 1867 this boom also began to decline, though gold
Jun 17, 2016#0183;#32;The first day of a hearing into the resource consents for an alluvial gold mine at Coal Creek was held in Alexandra yesterday Kokiri Lime Co Ltd owner Mack Ferguson outlined his company''s quot;proven track record'''' and other witnesses covered issues such as measures to suppress the dust from the venture, rehabilitating the land and the effect on
Aug 23, 2016#0183;#32;Local journalism matters now more than ever. As the Covid19 pandemic brings the world into uncharted waters, Otago Daily Times reporters and photographers continue to bring you the stories that matter. For more than 158 years our journalists have provided readers with local news you can trust. This is more important now than ever.
Alluvial mining is technically simpler than hardrock mining, so alluvial mining dominated Otago''s gold mining history. Alluvial gold occurs as loose particles in the gravel, and is therefore easy to separate because of the high density of the gold. Many of the earliest alluvial mines were extremely rich (10''s or even 100''s of grams of gold
According to the Ministry of Economic Development, current annual gold production stands at some 11 t, mainly from industry heavyweights like Oceana Gold, Golden Cross and the Martha mine at Waihi, but also from about 50 other operations, small#173;tomediumsized alluvial mines which, like the Stewarts of Woodstock, use excavators and mobile gold
This thesis is an attempt to marry my experience as a mining engineer in alluvial gold and tin with the discipline of history, and the history of gold rushes in particular. My particular approach is to examine the role of mining as a successor to gold rushing. In this, Gabriel''s Gully and the Blue Spur were an appropriate example to study as they
River channels up to 50 m deep occur locally, although most relief is less than this. Alluvial gold occurs close to the base of the gravels, near the underlying unconformity. The goldbearing sediments have been folded and faulted by structures along the northeast Otago margin, so the miners followed tilted or even vertical zones.
Aug 19, 2014#0183;#32;Depressed gold prices and rising production costs similarly led to Oceana Gold laying off about 270 staff and contractors at its West Coast, Reefton and East Otago gold mines in recent months. Startup costs of the Earnscleugh project the largest alluvial (riversediment) gold operation in the country and one of Central''s biggest employers
Gold occurs in two distinct geological settings in Otago: within quartz veins in the schist (hardrock gold), and as detrital gold grains in gravels (alluvial gold). The quartz veins which contain the hardrock gold were formed by hot water (200400#176;C) passing through fractures in
There is a miners memorial, and a new alluvial gold mine at the top of the gully (2017). Some mining did take place around Waituna itself, although indications are it was never rich. Various dredging or sluicing ponds remain around the town, on private land. Otago Daily Times newspaper (1910) Notes from Waituna, issue 14903, 04 August 1910.
Waikaia''s second gold rush has come to an end. On Tuesday afternoon, the final bucket load of alluvial gravel was scooped up from the depths of Waikaia Gold''s mine at Freshford and loaded into the
Island Block alluvial gold mine (near Roxburgh) after rehabilitation. The mine was developed in an old channel of the Clutha River (flats in foreground) which was abandoned thousands of years ago. During the mining operation, a hole more than 20 metres deep was dug progressively downstream, and the excavated gravel was used to backfill the hole
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