Keller paid $6,174 for the options representing a purchase price of 7 cents each.
The purchase increases Keller’s total holding in the company to 755,000 shares and 1.683 million options.
Keller’s purchase follows Cobalt Blue’s CEO Joe Kaderavek purchase of over $20,000 worth of shares through on-market trades last week.
Last week, Cobalt Blue also revealed that it had commenced the largest single drilling campaign to date at its flagship Thackaringa Cobalt Project near Broken Hill.
More than 15,000 metres are to be drilled over the coming six months as part of a feasibility study with the primary aims of upgrading and growing cobalt resources.