The mining venture never generated a flake of gold, and a Herald investigation found he had lost hundreds of thousands of investors dollars to several different scammers who promised him tens of millions of dollars in capital to build his mine.
The Financial Markets Authority issued a public warning about Infratech in 2014 drawing attention to "consistent statements" made by Cottle about his "purported ownership of mining licences".
In a High Court decision liquidating Infratech in 2015, Associate judge John Matthews said Cottle was asked about his claimed mining rights.
"When pressed on how this asset has any actual value, or could be realised, Mr Cottle was without explanation," the decision said.
Prior to his pursuit of precious metals in South America, Cottle had - according to an Employment Relations Authority decision dating from 2005 - claimed to have contracts from the Estonian government to manufacture railway sleepers.
And after Infratech collapsed Cottle had sought to use another company, Sceptre Minerals, to raise US$500,000 ($723,400) selling what he called "low risk" gold options advertised as allowing investors to double their money in a year.