April 9 (Reuters) - Westgold Resources Ltd WGX.AX :
* WESTGOLD SELL LITHIUM ROYALTY RIGHTS FOR A$15 MILLION
* ADVISES THAT SALE AGREEMENT WITH COBALT 27 EXPIRED WITHOUT BEING COMPLETED
* ENTERED INTO A REVISED ROYALTY SALE AGREEMENT FOR ITS LITHIUM ROYALTIES WITH SILVERSTREAM SEZC