Capital raises are back for listed resources juniors, with a spate of cash calls on Wednesday morning.

ASX-listed Canadian rare earths producer Vital Metals was out with a $45 million placement on Thursday afternoon, telling investors private equity firm Lionhead Resources would tip in at least $30 million as a cornerstone investor.

Bauxite miner Metro Mining is after $20 million at 2¢ a share in a placement via Shaw and Partners and Petra Capital.

Oil and gas junior Blue Energy was fronting investors with a $20 million share placement on Tuesday morning to pay for appraisal drilling and testing at its North Bowen basin and Surat basin projects.

West Australian explorer Galena Mining was asking investors for $15 million on Monday morning for work at its lead, silver project Abra.

Frontier Energy is aiming to become an integrated producer of key fuels required to meet aggressive government emissions targets.

Copper and gold explorer Stavely Minerals was fronting investors for a $3 million placement on Friday to fund exploration and working capital needs.

ASX-listed defence and communications company Electro Optic Systems is offering shares at the lowest price in six years, in a bid to raise $15 million before its June 30 half-year balance date.

Comet Resources has appointed Jett Capital Advisors LLC and Petra Capital Pty Ltd to joint-manage the company's $50 million capital raise as part of the acquisition transaction, while Euroz Hartleys will co-manage Comet's public offer. Additionally,...