Tumas 1 East Resource Drilling Delivering Above Expectations
- Resource definition drilling in the Tumas1 East area has tested two of the five tributaries targeted for follow-up with drilling of the balance planned for 2019.
- The infill drilling on the two tributaries tested has confirmed strong, continuous calcrete- type uranium mineralisation:
o 6.2km of mineralised channel will now be considered for the forthcoming resource estimation work
o 157 infill holes drilled, 92 returned >100ppm eU3O8 over 1m.
- Best intersections include
o TA222 8m at 354ppm eU3O8 from 2m
o TA230 9m at 1799ppm eU3O8 from surface
o TA239 7m at 426ppm eU3O8 from 3m
o TA249 9m at 382ppm eU3O8 from 2m
o TA257 5m at 389ppm eU3O8 from 2m
o TA303 4m at 608ppm eU3O8 from surface
1m at 741ppm eU3O8 from 12m
2m at 963ppm eU3O8 from 18m
o TA306 8m at 554ppm eU3O8 from 2m
- Resource upgrade drilling has commenced using two rigs on Tumas 3 West to complete the drilling campaign for 2018.
- A new resource estimate for Tumas 1 East and Tumas 3 West is expected in Q1 2019.
- Mineralisation is calcrete-associated hosted within palaeochannels, similar to the Langer Heinrich uranium mine located 30km to the north.
Since the last drilling update (as reported 5 November 2018) 157 holes have been drilled from 1 to 23 November for 1,828m completing the resource definition drilling on Tributary 1 and the upper reaches of Tributary 2. In total, 265 RC holes for 3,100m have been drilled since 1 October testing these two tributaries.
Although more resource infill drilling is required in Tumas 1 East to test three more mineralised tributaries that have been identified, the two RC rigs working in this area have now been moved to carry out resource drilling over the highly prospective western extension of the Tumas 3 discovery. This will then complete the 2018 drilling campaign. Figure 1 (see link below) shows the prospective paleochannel system outline and prospect locations.
Tumas 1 East Resource Drilling
As previously reported, exploration drilling testing the headwaters east of the Tumas 1 deposit has identified a uranium-fertile multipronged channel system comprising, at this stage, seven tributaries draining into the main Tumas palaeochannel in the vicinity of the Tumas 1 deposit. Continuous uranium mineralisation was identified along Tributary 1 and the upper reaches of Tributary 2 (see Figure 2 in link below). Resource infill drilling from November 1 to 23 has now confirmed the continuity of this uranium mineralisation for 4.6km in Tributary 1 and 1.6km for Tributary 2, all totalling 6.2km.
These mineralised channels range from 100m to 900m in width. The mineralisation is located at shallow depth from surface to 20m. Except for localised hot spots, large parts of this mineralisation do not show any surface radiometric expression.
The 265 RC holes drilled since 1 October to test Tributaries 1 and 2 are now earmarked for resource estimation. Of this, 192 or 72% show uranium mineralisation above 100ppm eU3O8 over 1m. The average grade, at a 200 ppm eU3O8 over 1 m cut off, is 434ppm with an average thickness of 6.6m and is well within the range of the 300 to 500ppm target. In places the mineralisation can reach a thickness of up to 14m (TA238) and grade of up to 1,799 ppm eU3O8 (TA230).
Drill hole and channel locations are shown in Figure 2(see link below). Figures 3 and 4 (see link below) show a drill crosssection through the main Tributary 1 and a drill long-section respectively highlighting the continuity and thickness of mineralisation.
Mineralised intersections from the current reporting period that are above the 100ppm U3O8 over 1m cut-off are tabulated in Table 1, Appendix 1. Table 2 in Appendix 1 lists all holes drilled in this period. The equivalent uranium values are based on down-hole radiometric gamma logging carried out by a fully calibrated Aus-Log gamma logging system.
The resource infill drilling has been highly successful, identifying 6.2km of continuously mineralised palaeochannel. In total, 336 RC holes for 4,100m were completed over 2 months over the entire Tumas 1 East area. Those two of the five prospective tributaries that have been infill drilled will be the focus of a new resource estimation to be completed in early 2019.
Drill spacings have varied from 50m to 100m along lines 100m to 1,600m apart. Of these holes, 211 returned positive results of more than 100ppm eU3O8 over 1m. This reflects an almost 63% success rate. The average grade of the 1m intersections >100ppm U3O8 is 286ppm and, importantly, in the >200ppm U3O8 this average grade increases to 429ppm which is the cut-off used in the previous resource estimates.
The results of the ongoing exploration are regarded as very encouraging. This drilling in what was a previously unknown headwater system of the Tumas palaeochannel system has identified a new continuous calcrete-type uranium mineralisation at shallow depth which will result in another resource upgrade for the Tumas palaeochannel calcrete resources.
Significantly, the new uranium mineralisation identified in the tributaries of this palaeochannel system in the Tumas East area has opened up the potential for further mineralisation in Tributaries 4, 5 and possibly 6, along an extensive strike length.
The ongoing work again confirms that the uranium mineralisation is not confined to one simple, single channel but rather is associated with a complex palaeodrainage system containing several channels and tributaries.
This fourth (ongoing) drilling campaign continues to emphasise the strong exploration potential of the extensive, uranium-fertile palaeochannel system within which the new Tumas palaeochannel discoveries occur.
The drill program emphasis has now shifted to resource drilling at Tumas 3 West where the two RC drill rigs are currently operating. These drilling programs will continue into December.
An updated Inferred Resource estimation for the Tumas 1 East Zone, in conjunction with Tumas 1 & 2 and Tumas 3 West is expected to be delivered in early 2019.
John Borshoff commented: "the Tumas palaeochannel has developed into a remarkable exploration target with drilling producing desired results on a consistent basis, rejuvenating the Reptile project significantly. The drilling campaigns that have focussed on this channel system since Feb 2017 guided by new management is uncovering huge potential. The latest positive resource drilling exemplifies the confidence we have in the potential of this target to add to our growing resource base."
To view figures, please visit:
About Deep Yellow Limited
Deep Yellow Limited (ASX:DYL) (OTCMKTS:DYLLF) (Namibian Stock Exchange:DYL) is a specialist differentiated uranium company implementing a new contrarian strategy to grow shareholder wealth. This strategy is founded upon growing the existing uranium resources across the Company's uranium projects in Namibia and the pursuit of accretive, counter-cyclical acquisitions to build a global, geographically diverse asset portfolio. The Company's cornerstone suite of projects in Namibia is situated within a top-ranked African mining destination in a jurisdiction that has a long, well regarded history of safely and effectively developing and regulating its considerable uranium mining industry.
Deep Yellow Limited