History
A California oil explorer that failed in Texas and South Africa reinvented itself in 2019 as a gold explorer, built large resources in Argentina and Ecuador, and by 2026 began toll-milling gold.
2007-2009: Small oil wells in California
The company, then called Sunset Energy, listed after a prospectus in October 2007 to raise $3,000,000 at $0.20 a share. The money was to earn 50% of the Maricopa and Deer Creek prospects in California by funding one well on each, in a deal with Solimar Energy.
The first Maricopa well, Wellington Maricopa #6, tested at 35 barrels of oil a day in April 2008, and first oil was sold in May. A second well, #7, was completed in September 2008 and produced 17-22 barrels a day. Elsewhere the news was worse. A 20% stake in the Silverthread project in the Ventura Basin missed its deeper target, and an 8% interest in the Aliso Canyon prospect, bought in September 2008, was a dry hole by late October.
Funding got harder. A $0.20 placement in May 2008 was followed by a December rights issue at just $0.05. By March 2009 that had raised $670,337, taking shares on issue to 42,157,337. In mid-2009 Solimar said #7 remained shut in and relations with the Silverthread operator had soured.
2009-2012: South Africa and Texas gas
In December 2009 the company agreed to buy Bundu, which held South African permits including the Cranemere shale gas application. Completed in April 2010, the deal issued 48,474,038 shares to Bundu holders and made Dr Paul Bilston Managing Director. Within weeks the Cranemere application was refused, but a new, larger application was accepted in June 2010.
The company also bought into the Triple Crown gas prospect in Texas in June 2010, funded by a placement at $0.085 and later short-term loan facilities. The first well, drilled from November 2010, found thick gas-charged sands, and the company assessed 9.0 trillion cubic feet of gas in place. It raised A$7.1m at 15c in April 2011. But a horizontal test of the Ellenburger rock layer in October 2011 found no commercial gas flow.
In August 2011 the company, by then called Challenger, agreed to earn up to 50% of the Mercury Stetson prospect in North Texas. Drilling troubles followed, and a placement at 5c in February 2012 was far below the 15c price of 2011. A Woodford test and then a Barnett test produced gas briefly, but water loaded the well and operations ceased in June 2012. The Triple Crown lease was left to expire.
2012-2018: Waiting on South Africa
South Africa's moratorium on Karoo applications, in place since May 2011, was lifted in September 2012. Cash was thin, though. In November 2012 ASX queried cash of A$155,000, and the company sold its 50% of Maricopa for US$1.25m, US$625,000 to Challenger. Robert Willes replaced Bilston as Managing Director in April 2013.
The following years were a slow grind of small raisings: A$1.0m at 6c in 2013, a small options offer in 2014, A$1.2m at 6c in November 2014, and A$900,000 at 3c in 2016. Regulators moved by inches. In October 2014 the petroleum agency said it would process the Bundu application, and in 2015 technical regulations were gazetted, but no exploration right was ever granted. The record for 2017 is quiet.
In May 2018 ASX questioned whether the company's assets justified staying listed. Its shares were suspended on 7 August 2018, and in September 2018 the mining law amendment bill was withdrawn.
2019-2020: A new start in gold
In February 2019 Challenger signed a deal to buy AEP Corporation, which could earn 75% of the Hualilan gold project in Argentina and 100% of El Guayabo in Ecuador. The price was 180m shares, 78.4m options and 120m performance shares, with a $5.0m raise at 3c. The raise closed oversubscribed, and the shares resumed trading on 4 July 2019 under new management led by Kris Knauer, with Fletcher Quinn as chairman.
Drilling at Hualilan began in October 2019 and quickly found high-grade gold over 1.7km of strike. In January 2020 the company added Colorado V and El Guayabo 2 in Ecuador and raised $6.5m at 10c. Historical Colorado V holes showed wide gold intercepts. In July 2020 it raised A$20m at 20c for a large drilling program, later expanded to 45,000m. It also earned an initial 25% of Hualilan.
2021-2023: Resources and a scoping study
Drilling kept finding new zones, and metallurgical tests showed gold recoveries of 91-94%. Money came in steps: a A$3.5m advance in April 2021 and a A$42.1m placement at A$0.28 in May. In July 2021 the company agreed to take Hualilan from 25% to 100% for shares and US$3.69m, completed in September. Shares on issue passed 975 million.
The first El Guayabo holes in January 2022 gave wide but low-grade intercepts. Hualilan's maiden resource arrived in June 2022 at 2.1 million ounces gold equivalent, upgraded to 2.8 million in March 2023. In September 2022, with cash down to A$10.4m, the company signed US$15m of convertible debentures with Queen's Road Capital. A maiden El Guayabo resource of 4.5 million ounces followed in June 2023, with a A$10m placement.
Cyanide leach tests in August 2023 gave 89% gold recovery and delayed the scoping study. When it came in November 2023, it showed a seven-year mine, pre-tax NPV of US$409m and about US$150m of funding needed. Sergio Rotondo had become Executive Chairman in September.
2024-2026: Toll milling and first gold
Funding needs led to a change of path. Placements at 8.5c in April 2024 raised A$9.6m, and in October a A$6.6m placement and a share purchase plan priced at 4.5c followed. Eduardo Elsztain's group became the largest shareholder at 12.7% and he became chairman in March 2025. Hualilan won environmental approval in October 2024, and a toll-milling agreement with Casposo was signed in December 2024 to process 450,000 tonnes. Ecuador's resource doubled to 9.1 million ounces in April 2025.
Further raisings of about A$34.5m at 8c in June 2025 and about A$30m at 13c in October 2025 funded mining. Full permitting came in September 2025, and mining began in December. In April 2026 the company said mined grades in the top of two pits were about 50% below forecast. A stand-alone pre-feasibility study in May 2026 showed a 14.25-year mine and US$232m start-up capex. First gold poured in June.
An A$85m raise at A$0.12 was fully settled by 6 August 2026, with Peter Marrone as chairman and Knauer retired. On 13 August 2026 the company said it would move away from Casposo toll treatment, plan a transition of about four months and assess an ore purchase deal with Casposo, aiming at a heap leach.
Written from the 175 story beats below (2007 to 13 Aug 2026), which come from the company's own announcements and filings.