The hit was made 100m south of the previous known extent of Grace, with further results pending.
The targeting for Rox's drilling is based on a re-interpretation of the structural controls on mineralisation following work campaigns undertaken in 2020.
RC drilling is continuing.
A new resource estimate is due this year, with feasibility work also planned.
Additionally, diamond core drilling is planned after problems with a previous contractor last year.
Funding for the work was confirmed earlier this month when gold growth company backer Hawke's Point bought an 13% stake in Rox for A$11 million.
That investment took Rox's treasury (including receivables) to circa-$20 million.
Shares in Rox were up 10% to 4.4c in afternoon trade, capitalising the company at $90 million.