The company's stocks moved from the TSX Venture Exchange to the Toronto Stock Exchange in 2003. In 2009 the company would acquire Sheridan Jr.'s other company Aranka Gold Inc. and its properties around the Aremu River area in Guyana to conduct similar exploration work as being done in the Peters and Aurora properties. The company funded new exploration and, in 2004, reported result that indicated the discovery of a significant deposit in the Aurora Mine area. The company's stock price rose from $0.70 per share in May to $3.50 in November, as Goldcorp bought into the company acquiring 8.7% of its shares. The share price peaked in late-2006 at $11.90 as the company had raised funds for proceeding with scoping and feasibility studies. Over several years, as the studies outlined the feasibility of mining and they were issued a license to mine, the company was considered for acquisition by larger companies experienced in developing and operating gold mines, such as Agnico-Eagle Mines, however, the deals did not take place and Guyana Goldfields transitioned from a mineral exploration focus to a mine development company and sold some of its non-core assets to focus on its Aurora and Aranka deposits.. In 2012, they released an updated mine plan for Aurora that had them producing 3.29 million ounces of gold over a 17 year mine life. They raised sufficient funds to pay for the mine through private placements, stock offerings, and borrowings, much of it from International Finance Corporation and Export Development Canada. They began construction of the Aurora gold mine in 2014 after the board of directors approved the $238 million expenditure. In August 2015, Guyana announced its first gold production at its Aurora mine and began commercial Commercial production started in January 2016. However, also in 2015, a revised study lowered the mine's reserves to 2.86 million ounces of gold and a mine life of 16 years, and also the government of Venezuela made a territorial claim for the land underlying Guyana Goldfield's Aurora mine, and threatened the company with legal action. Guyana Goldfields was listed on the S&P/TSX Composite Component from June 2016 to Dec 2018. During that time, the Aurora mine under-performed and the 2018 third-quarter results were released, Sheridan Jr. was removed from the company causing its share price to fall to $1.62. A new technical study revealed that the 2012 studies had over-estimated the amount of recoverable gold reserves and a proxy fight, led by Sheridan Jr., resulted in the CEO Scott Caldwell and the remaining directors who were present in 2012 also being removed from the company.