Standard Uranium Ltd ( TSX-V:STND , OTCQB:STTDF , FRA:9SU0 ) has doubled the modelled width of the Thunderbird structural corridor at its Davidson River uranium project in the southwest Athabasca Basin, following detailed logging of core from its summer drilling program.
All five holes drilled along the Thunderbird Trend intersected the same package of graphitic shear zones, supporting the expanded structural model.
The 6,734-metre summer program comprised 12 holes testing the Warrior, Bronco and Thunderbird conductive trends.
"With the core logged and modelled, we can now see the true scale of the Thunderbird corridor," said Sean Hillacre, president and vice-president of exploration.
"Every hole along 2.8 kilometres of the Thunderbird Trend intersected the same package of graphitic shear zones, which we now model as 10 steep, stacked shears roughly 450 metres wide, double our pre-program model."
Standard Uranium also identified dravite, a boron-rich mineral, along with illite and kaolinite clays in five drill holes across all three trends.
The company said the combination of minerals is commonly found around uranium deposits hosted in basement rock along the Patterson Lake Corridor, making it a useful indicator for identifying areas that warrant further exploration.
Clay alteration extends more than 300 metres below the boundary between basement rock and overlying sedimentary rock in holes DR-26-047 and DR-26-049. Magnesium-rich chlorite, possibly the mineral sudoite, was most commonly found along the Thunderbird Trend.
Hillacre said the identification of the alteration minerals was consistent with the company's exploration objectives in the southwest Athabasca basement.
At the Bronco Trend, four holes have defined a structural corridor approximately 250 to 400 metres wide, tested over 1.3 kilometres of strike.
On the Warrior Trend, holes DR-26-049 and DR-26-050 intersected fault and shear zones associated with dravite and abundant illite-kaolinite clay alteration.
The company said anomalous radioactivity was closely associated with structural deformation across the project.
A pegmatite intersected in hole DR-26-047 at Bronco returned readings of up to 570 cps between 493 and 493.5 metres.
Standard Uranium noted that all three conductive trends remain open down-dip and along strike.
The company plans to combine the results with its structural model, alteration logging and geophysical data to prioritize follow-up targets along the Thunderbird and Bronco corridors, the dravite-bearing structures on the Warrior Trend, and more than 60 kilometres of untested conductive strike length across the project.
Davidson River is located in the southwest Athabasca Basin, a uranium exploration district in Saskatchewan that hosts several basement- and unconformity-associated uranium deposits.
