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otago gold alluvial mining

Alluvial gold mining in Otago, Gold in Otago,

2021-7-9  Alluvial mining is technically simpler than hard-rock 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 per tonne of gravel), but most gravels had at most a few grams of gold

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otago gold alluvial mining hanaro2019

2021-5-14  Central Otago rivers were rich with gold and the focus of the early alluvial mining of river flats and shallows during the first rush in the early 1860s. Dredging (1880s1920s) ploughed the riverbeds and eventually the inland terraces and beyond and is responsible for most of the altered landscapes.

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Environmental aspects of mining gold in Otago, Gold

2021-5-25  Environmental aspects of mining gold in Otago. 1. 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.

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Alluvial gold Gold and gold mining Te Ara

2021-7-3  These gold nuggets have been mined from river gravels in Otago. The gold has been beaten by boulders in flood waters, then folded back over countless times to give these flattened shapes. Dark impurities visible in the larger nuggets are black mineral sands (possibly magnetite) and the lighter impurities

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Hard-rock gold mining in Otago, Gold in Otago,

2021-7-2  Mining hard-rock gold requires considerabley more technological input than alluvial gold. Historically, hard-rock mining was a minor part of the gold mining industry in Otago because it is a very capital-intensive process. First the quartz had to be blasted from the bedrock schist, in tunnels of underground mines.

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Patearoa gold: Alluvial concentrations in a dynamic

2021-6-23  The gold at Patearoa has been concentrated in gravel deposits (=alluvial gold) that accumulated in alluvial fans on the slopes of the actively rising Rock and Pillar Range. The on-going uplift over the past million years caused erosion of early-formed gravels, and the gold has been recycled into progressively younger gravel deposits, and into modern streams. The ultimate source of the gold. The Macraes gold deposit occurs in a complex fault zone in the Otago

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Otago Te Ara Encyclopedia of New Zealand

2021-6-9  Historically in Otago the majority of recovered gold was alluvial less than 10% came from hard rock. Otago’s gold is linked to its schist rocks. Over the past 100,000 years glaciers ground away at the rocks, which were threaded with quartz veins containing

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Gold and gold mining Te Ara

2021-7-8  The early mining of the 1860s in Otago and on the West Coast was mainly undertaken by individuals working alluvial deposits (river gravels). In three separate years in the late 1860s and early 1870s the amount of gold won exceeded 20,000 kilograms. These totals have never been bettered. From the 1870s mining became more mechanised.

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Alluvial gold mine approved Otago Daily Times

2016-8-23  There's no need to travel to Rio to win gold, as a large-scale alluvial mining operation near Roxburgh has got resource consent. However, opposing neighbours may appeal. Independent commissioners yesterday released a decision allowing Kokiri Lime Company Ltd to mine on 163ha of land at Coal Creek Flat now used for pastoral farming and horticulture.

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Archaeological survey of the Arrow River and Macetown,

2018-5-25  In January 1863 miners overflowing from the Shotover and the Arrow goldfields moved into the area, and a settlement soon established, with alluvial mining in the river and stream beds and banks as its economic base. The higher river terraces were also worked once races were constructed to bring water to the claims.

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Alluvial gold Gold and gold mining Te Ara

2021-7-3  Alluvial gold. These gold nuggets have been mined from river gravels in Otago. The gold has been beaten by boulders in flood waters, then folded back over countless times to give these flattened shapes. Dark impurities visible in the larger

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Otago Te Ara Encyclopedia of New Zealand

2021-6-9  Historically in Otago the majority of recovered gold was alluvial less than 10% came from hard rock. Otago’s gold is linked to its schist rocks. Over the past 100,000 years glaciers ground away at the rocks, which were threaded with quartz veins containing gold

get price

Gold and gold mining Te Ara

2021-7-8  The early mining of the 1860s in Otago and on the West Coast was mainly undertaken by individuals working alluvial deposits (river gravels). In three separate years in the late 1860s and early 1870s the amount of gold won exceeded 20,000 kilograms. These totals have never been bettered.

get price

Alluvial gold mine approved Otago Daily Times

2016-8-23  There's no need to travel to Rio to win gold, as a large-scale alluvial mining operation near Roxburgh has got resource consent. However, opposing neighbours may appeal. Independent commissioners yesterday released a decision allowing Kokiri Lime Company Ltd to mine on 163ha of land at Coal Creek Flat now used for pastoral farming and horticulture.

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Central Otago Gold Story

Otago’s alluvial gold comes from its schist mountains. During the ice ages, huge glaciers crushed and spread the schist through the valleys. Since then, the mighty Clutha Mata-au has acted like a huge sluice, leaving behind fine particles of gold where its waters flowed. As gold mining became more mechanical, the diggers deserted Otago in

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Gold New Zealand Geographic

2021-7-7  This is certainly true of industrial gold-mining, though here the scale, complexity and microscopic precision of extraction can be staggering. If my nugget-detecting was a needle-in-the-haystack kind of quest, at Macraes Flat, in coastal Otago, the gold

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Gold and the economy Te Ara Encyclopedia of New

2021-7-7  Up to 2003, about 538,640 kilograms of alluvial and 368,544 kilograms of hard-rock gold had been produced in New Zealand. The total value (in 2003 terms) was US$116.32 billion. A few large operations were responsible for most of the hard-rock gold. The Waiuta mine near Reefton produced 62,369 kilograms of gold between 1870 and 1951.

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Public Gold Fossicking Areas New Zealand Gold

Alluvial gold is present within all these gold fossicking areas, although the concentrations are often low. All these areas are suitable for gold panning and sluice boxing, mining being restricted to hand-held non-motorised methods within the active stream bed. Nelson-Marlborough and the West Coast

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9 Cromwell & Bannockburn historical sites to visit,

2021-1-2  Environmental aspects of mining gold in Otago, Gold in Otago, “Environmental standards of Otago’s pioneering Europeans were low, and mining activity was essentially unconstrained. The scars still remain from this era because revegetation in Central Otago is slow, especially where the thin soil has been sluiced away. Alluvial mining

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Show Mines of New Zealand: Macraes Mine

2021-3-5  The Macraes mine is the largest active gold mine in New Zealand. Initially it was expected to bear gold for 10 years of operation, but at the moment the remaining gold is estimated to last 35 years. Mining, especially modern mining, is using chemicals to extract the valuable substances.

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Archaeological survey of the Arrow River and Macetown,

2018-5-25  the focus for alluvial gold mining operations as well as the site of the town of Macetown (Figs 3 and 4). Extensive alluvial workings were also located on the hillsides above the township, and in many places along the bed and banks of the river. The insides of many bends show evidence of small-scale alluvial mining.

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Central Otago Gold Story

Otago’s alluvial gold comes from its schist mountains. During the ice ages, huge glaciers crushed and spread the schist through the valleys. Since then, the mighty Clutha Mata-au has acted like a huge sluice, leaving behind fine particles of gold where its waters flowed. As gold mining became more mechanical, the diggers deserted Otago in

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As good as gold Te Ara Encyclopedia of New Zealand

2021-5-30  The early mining of the 1860s in Otago and on the West Coast was mainly undertaken by individuals working alluvial deposits (river gravels). In three separate years in the late 1860s and early 1870s the amount of gold won exceeded 20,000 kilograms.

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Tinkers diggings, Ophir (Blacks; Omakau), Central

The Undaunted Tinkers Gold Mining Company Limited was formed in 1921, to mine the alluvial gravels at Tinkers, then the company went into liquidation in 1923. More mining took place across several small, now water filled, open pits in the 1980's.

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Goldfields Mining Centre (Cromwell) 2021 All You

The guided tour is a must, with knowledgeable guides. There is a real gold nugget you can feel. A working stamping battery and sluicing gun are on display and you can also have a go at gold panning yourself. Don't expect to find a big nugget though the majority of Central Otago's gold is alluvial gold.

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Central's new gold discovery Otago Daily Times

2012-4-24  Glass Earth has spent more than $35 million in mainly South Island exploration during the past five years. In March it posted a $2.13 million loss for 2011 trading, but retained about $4.45 million cash in hand for ramping up its Central Otago gold-extraction. Mr Henderson said income from alluvial mining this year, which in 2011 was about

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Mine to close; 35 jobs lost Otago Daily Times Online

2014-8-19  Depressed gold prices and the high dollar have been blamed for the closure of the privately owned Earnscleugh alluvial gold mine near Alexandra stripping 35 jobs and millions of dollars from the local economy. Sole director Geoff Loudon, of Mintago Investments Ltd (part of the wider L&M Group), told the Otago Daily Times yesterday ''there's

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Eluvial gold placer formation on actively rising

1993-5-1  Photograph of eluvial gold nugget from Central Otago; complex aggregate of wire gold which has partially or wholly overgrown lithic soil material (mainly angular schist fragments, e.g. top and bottom left, and centre), central Raggedy Range. Specimen is 2

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Waitahuna Gully, Waitahuna, Clutha District, Otago

Alluvial gold. Waitahuna Gully is 3 kilometres south-east of Waitahuna. Gold was discovered here by Gabriel Read. After discovering gold at what would become Gabriels Gully in 1861, the first major gold field discovery in Otago, the government employed him as a prospector for a few months.

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Show Mines of New Zealand: Macraes Mine

2021-3-5  The Macraes mine is the largest active gold mine in New Zealand. Initially it was expected to bear gold for 10 years of operation, but at the moment the remaining gold is estimated to last 35 years. Mining, especially modern mining, is using chemicals to extract the valuable substances.

get price