The rights issue saw 2.615 billion shares issued at a price of 1 cent each raising $26.15 million.
Jerkovic's purchase through participation in the rights issue increases his overall holding in the company to 111.04 million shares.
Proceeds to fund Stage 1 expansion at Wiluna
Funds raised will allow Blackham to finalise the Stage 1 expansion, which is part of Blackham's operating strategy to expand gold production at the 6.4-million-ounce Matilda-Wiluna Gold Operations in WA.
The Stage 1 expansion aims to increase annual gold production to between 100,000 and 120,000 ounces.
Earlier this week, Blackham signed an agreement to sell the remaining planned gold concentrate production from the Stage 1 expansion.
Polymetal is a top-20 global gold producer and top-5 global silver producer with nine mines.