** Shares of PLS Group PLS.AX rise as much as 2.8% to A$5.490, hitting their highest level since November 14, 2022
** Lithium miner proposes offering of up to $500 million senior unsecured notes
** Says portion of cash proceeds will be used to refinance part of existing debt facilities
** Says remaining proceeds to be used for general corporate purposes
** Stock has gained nearly 30% this year, including the day's move
(Reporting by Rajasik Mukherjee in Bengaluru)
((Rajasik.Mukherjee@thomsonreuters.com))