The shares were purchased at an average price of 11 cents through on-market trades and this takes Williamson’s overall holding to 500,000 shares.
Williamson is a mining engineer with over 10 years experience in technical and corporate roles in the mining and finance sectors.
Blackstone's primary focus is on cobalt in British Columbia, Canada, enhanced by copper, gold and nickel.
In mid-December 2018, Blackstone raised $1.2 million through a share placement of 12 million shares priced at 10 cents.
Funds will be used to further exploration at the BC Cobalt-Gold Project in Canada and the Silver Swan South Nickel-Gold Project in Western Australia.