Mr Fowlie's daughter Mindy received the news while on holiday.
She posted a tribute photograph of her dad on Facebook yesterday.
Mr Fowlie's son Trent, who also lives in Kalgoorlie, was stunned to hear his dad had died.
On Saturday, he posted on Facebook that he had "just received the worst news" and was alerting other family members that his dad had died in a mining accident.
"Don't know a lot of details but am trying to get some. R.I.P dad, you will be missed."
The WA Department of Mines and Petroleum sent inspectors to the site on Sunday while mine operations were halted for an investigation to be carried out.
One friend, Sharne Pietersen Douglas said Mr Fowlie was "a great guy".
"[He] always managed to cheer me up and was one of the most genuine people I've ever met."