By Hilary Mare
DEEP Yellow Limited (DYL), is testing various geophysical methods, including gravity, magnetic, electromagnetic and passive seismic, over the new Tumas 3 discovery, to determine whether such surveys can help to better define blind uranium targets, and provide a clearer focus for future drilling campaigns.
DYL Managing Director and Chief Executive Officer, John Borshoff, highlighted this last week in a statement that detailed how investigations of all previous results, accumulated from palaeochannel exploration, are continuing to define the most prospective sections of the extensive channel system identified.
“The positive results from Tumas 3 reinforce the strongly-held belief of the management and technical team that the palaeochannels, occurring within the DYL-held tenements, present a valid and significant regional exploration target. These palaeochannels are showing they have been inadequately tested, as evidenced by the discovery that has been made at Tumas 3,” Borschoff said.
“The highly encouraging positive results, together with approximately 100km of prospective palaeo-drainage identified as still-to-be-tested, provide management with increasing confidence that the existing uranium resource base within the Reptile project area can be further increased.”
On 11 July, DYL confirmed the successful completion of the 10 000m drilling program at its Tumas 3 prospect on EPL 3496. The RC drilling commenced in March and was completed in early July.
A total of 400 holes for 10 545 m were drilled. All holes were down-hole gamma logged by a fully calibrated AUSLogger and all down-hole gamma data was converted to equivalent uranium values in parts per million of equivalent uranium (eU3O8ppm).
“All eU3O8 determinations have been made. Geochemical sampling of selected intersections for routine confirmation of eU3O8 values has started, and an initial batch of samples has been submitted for uranium assays. All drilling has been conducted on a 100m x 100m spacing, considered sufficient to define a maiden inferred resource. Once the geochemical assays are evaluated and the eU3O8 deconvolution work is verified, a maiden mineral resource estimate on Tumas 3 will commence, and is expected to be completed in late September 2017,” said Borshoff, in light of the resource estimation.
The drilling of the Tumas 3 target zone has delineated 4.4km of uranium mineralisation in calcrete rich fluvial sediments, occurring within the prospective palaeochannel system. Of the 400 drill holes defining the new discovery, the results of which have been progressively reported, 284 returned positive results – a 71 percent success rate.
Although the mineralisation occurring closer to the western margin of the drilled area is narrower compared to the central mineralised zone, the Tumas 3 mineralisation remains open both to the west and east. This, in addition to some outlying mineralised holes from previous drilling, strongly justifies continuing with extension drilling, to determine the full extent of the Tumas 3 discovery.
This new uranium discovery occurs as a discrete mineralised zone, separate from the uranium deposits the company has identified within these palaeochannels in its Tumas 1 and 2 and Tubas Red Sands/Calcrete deposits. The palaeochannels occurring away from these deposits have only been sparsely drilled along widely spaced regional lines, 2km apart, in the vicinity of Tumas 3. Elsewhere spacing varies widely, with large areas undrilled, leaving ample opportunity for both the expansion of Tumas 3 and for further discoveries to be made within what is now recognised as a very poorly tested, highly prospective palaeochannel system of 100km in length.
Confidente. Lifting the Lid. Copyright © 2015