Interpretation of High-Resolution Geophysics at Music Valley HREE Project

About this update from Dateline Resources Limited

Ground truthing of three priority prospects underway SAN BERNARDINO, CA / ACCESS Newswire / June 17, 2026 / Dateline Resources Limited (ASX:DTR)(OTCQB:DTREF)(FSE:YE1) (Dateline or the Company) is pleased to announce the geophysical interpretation of the Music Valley Heavy Rare Earth Project (Music Valley), located in Riverside and San Bernardino Counties, California, USA. Highlights The magnetic and radiometric survey undertaken in March 2026 included all the 20,520 acres highlighted in the Music Valley Project announcement (ASX Announcement 11 March 2026). The geophysical interpretation highlights significant structural detail, corresponding with areas that the USGS has mapped containing the favorable Pinto Gneiss unit. The Thorium rich domains appear to be the best proxy for HREE mineralization, with local faulting and contact with younger diorite intrusions expected to be the most prospective targets for exploration. The coincidence of these three features will be the focus of future mapping, sampling and drilling campaigns. All three priority prospects are located outside the 252 claims that are the subject of court proceedings. Dateline's Managing Director, Stephen Baghdadi, commented: "Music Valley has always had the ingredients of a significant heavy rare earth district. What these surveys have done is show us where those ingredients come together. "The interpretation has identified a series of structurally complex zones associated with elevated thorium signatures and favorable Pinto Gneiss geology. These are precisely the types of settings where we would expect rare earth mineralization to be concentrated. "Rather than searching across a large land package, we are now focusing on a small number of highly prospective target areas. Tony Mariano Jr and Russell Mason are currently ground-truthing these prospects, and that work will guide the next phase of sampling and drill targeting." Survey Interpretation The most interesting feature was noted with the Th2/U ratio map from the radiometric survey. The high Th is considered a proxy for elevated HREE in the minerals monazite and xenotime. The processed data highlighted a number of structurally complex zones on the western side of the project for further examination. These appear to correlate in some zones where the Pinto Gneiss was mapped at the regional scale. Figure 1: Th2/U r...

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