April 24 (Reuters) - Zeta Resources Ltd ZER.AX
* Increase in offer price for BGH
* Advises that it will increase offer price from 3.5 cents to 3.8 cents
* Refers to Zeta's intention to make an off-market takeover bid to acquire all shares in issued capital of Bligh Resources Source text for Eikon: Further company coverage: BGH.AX