The Poseidon bubble was a stock market bubble in which the price of Australian mining shares soared in late 1969, then crashed in early 1970. It was triggered by the discovery by Poseidon Nickel of the early indications of a promising nickel deposit in September 1969.

Poseidon Bubble
Poseidon Bubble graph, depicting a massive price bubble between 1969 and 1970
A graph of nickel prices during the bubble
DateSeptember 1, 1969 – January 1, 1970 (1969-09-01 – 1970-01-01)
Duration4 months
TypeStock market bubble
CauseDiscovery of nickel during a shortage
Poseidon Nickel Limited
Traded asASXPOS
Founded1969; 51 years ago (1969)

In the late 1960s, nickel was in high demand due to the Vietnam War,[1] but there was a shortage of supply due to industrial action against the major Canadian supplier Inco. These factors pushed the price of nickel to record levels, peaking at around £7,000/ton (£113,000 in 2018 adjusted for inflation)[2] on the London market early in November 1969.[3] In September 1969, the mineral exploration company Poseidon NL made a major nickel discovery at Mount Windarra 22 kilometres (14 mi) northwest of Laverton, Western Australia. In early September its shares, which had been trading at $0.80, began rising on insider trading (which was not illegal at the time). On 1 October, Poseidon announced that drilling had struck 40 metres of ore averaging 3.56% nickel and the share price immediately rose until Poseidon shares were trading at $12.30. After that, very little further information came to light but the price continued to climb on speculation. At one point, a UK broker suggested a value of up to $382 a share.[4][3]

The price of Poseidon shares quickly became too high for many investors, so some turned to stocks in other companies exploring near Windarra, and eventually other nickel mining stocks in general. As the price of mining shares grew, new companies were listed by promoters hoping to cash in. From October to December 1969 the ASX All Mining index rose by 44%. Mining stocks peaked in January 1970, then immediately crashed. Poseidon shares peaked at an intraday high of $280 in February 1970, and fell rapidly thereafter.[3]

By the time Poseidon actually started producing nickel, the price of nickel had fallen. Also, the nickel ore was of a lower grade than originally thought and extraction costs were higher. Profits from the mine were not sufficient to keep Poseidon afloat and it went into receivership in 1974. The company was delisted from the stock exchange in 1976. Western Mining then took over management of the mine, operating it until 1991. Mining ceased at Mount Windarra in 1989, and at South Windarra in 1991.[5] Mount Windarra produced 5.3 million tonnes of ore grading 1.5% nickel during the life of the mine.[6][3]

In 1974, the Rae Committee handed down its report on the Poseidon bubble, which documented numerous cases of improper trade practices. It recommended a number of changes to the regulation of stock markets, which ultimately led to Australia's national companies and securities legislation.[7]


  1. ^ Fernando, Vincent (11 October 2010). "The 10 Most Ridiculous Price Bubbles In History". Business Insider. Retrieved 14 May 2019.
  2. ^ "Inflation calculator". Bank of England. London. Retrieved 14 May 2019.
  3. ^ a b c d Simon, John (19 March 2003). "Three Australian Asset-price Bubbles" (PDF). Reserve Bank of Australia. Retrieved 14 May 2019.
  4. ^ Sykes, Trevor (3 October 2013). "Norm Shierlaw: Miner's punt on Poseidon paid dividends". Sydney Morning Herald. Retrieved 14 May 2019.
  5. ^ "Historical Timeline". Poseidon Nickel Limited. Retrieved 23 December 2019.
  6. ^ "Windarra Heritage Trail" (PDF). Department of Biodiversity, Conservation and Attractions Library. WMC Resources. Retrieved 14 May 2019.
  7. ^ "Australian Securities Markets and their Regulation: Report from the Senate Select Committee on Securities and Exchange" (PDF). Australian Government Takeovers Panel. Canberra: Australian Government Publishing Service. 1974. Retrieved 14 May 2019.

Further readingEdit

  • Weekend News Saturday January 10, 1970 - p. 10 -W.A. Shareholders in Poseidon and Poseidon slip $24.66 in London
  • Adamson, Graeme.(1989) Miners and millionaires : the first one hundred years of the people, markets and companies of the stock exchange in Perth, 1889-1989 Perth, W.A : Australian Stock Exchange(Perth) Limited. ISBN 1-875262-00-8