A charter flight carrying two pilots and nine passengers went missing over dense jungle on June 19, 2010, during a flight from Cameroon's capital Yaounde to Yangadou in the Republic of Congo.
The plane was found two days later but there were no survivors.
Sundance chairman Geoff Wedlock, managing director Don Lewis, directors Ken Talbot, Craig Oliver and John Jones, and company secretary John Carr-Gregg died in the crash, as well as Dynamiq risk advisor Jeff Duff, GMP Securities banker James Cassley, and Talbot's assistant Natasha Flason.
The two pilots were also killed.
The group were travelling to Sundance's Mbalam iron ore project.
About 30 people gathered at Kings Park this morning to mark the anniversary.
Mary Elizabeth Frye's poem ‘Do not stand at my grave and weep' was read out at dawn.
Former Sundance chief financial officer Peter Canterbury (now Triton Minerals MD) and former geology manager Rob Longley (now Ardiden MD) spoke at the service, as well as Dynamiq WA regional manager Peter Emmett, on behalf of Dynamiq MD Grant Chisnall.
"Whilst we all wish we could turn back time and tell them not to take that fateful trip, we all know that is not possible," Emmett said.
"All we can do is take solace in the fact that they were doing what they loved, with people whom they loved being with, in a place they loved working."
The tragedy hit the Australian mining sector hard at the time.
Wedlock was also chairman and director of Gindalbie Metals, Gladiator Resources and Jupiter Mines.
Oliver was the former chief financial officer of Western Areas. An award named after him is handed at the RIU Explorers Conference in Fremantle every year.
Queenslander Talbot had a net worth of just shy of $1 billion and was Sundance's largest shareholder. He was formerly the CEO of Macarthur Coal.
A public memorial in Perth in July 2010 was attended by more than 1000 mourners and was addressed by then-Western Australian premier Colin Barnett.