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blackredon Sep 11, 2017 5:04am
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2nd RNS
2nd RNS
TIDMDALR
Initial revised mineral resource modeling approach for two veins
at Curraghinalt show increase in ounces
TORONTO, September 11, 2017/Marketwired/ - Dalradian Resources Inc.
(TSX:DNA; AIM:DALR) ("Dalradian" or the "Company") announces that a
sensitivity study estimation performed on two of the major veins in the
Curraghinalt gold deposit (T17 and V75 veins) resulted in a 37% increase
in grade and a 10% increase in ounces. In the new study, the geology
wireframes were re-modelled using assays with a heavier emphasis on
logged geology. This approach yields 24% narrower veins accompanied by a
20% decrease in tonnage. (See Tables 1 and 2 below.) Composite length
was adjusted from 0.5 to 0.3 metres to reflect the narrower domains, but
all other parameters remain unchanged with the aim to isolate the impact
of re-wireframing.
Dalradian assessed the impact of the revised modelling methodology on
potentially mineable material for the two veins by applying the same
parameters as those used in the December 2016 feasibility study (FS). It
was found that the revised vein block models resulted in a higher
potentially mineable tonnage of 34% and a corresponding increase in
mineable ounces of 32% at the expense of a marginal decrease in grade
(1.5%). (See Tables 3 and 4 below.)
This change in modelling sequence, where wireframing is carried out on
geology and assays, followed by compositing within these wireframes, can
in part explain the positive reconciliation between mill and resource
(42% more ounces) resulting from the test stopes completed in 2016. (See
news releases of September 14 and December 8.)
Patrick F.N. Anderson, President and CEO said, "We are pleased with the
results of this exercise, which uses the same drill data to compare the
impact of wireframing prior to compositing, in estimating the mineral
resources and resulting mineral reserves at Curraghinalt. The new method
is the culmination of a great amount of hard work and reflects our
better understanding of the deposit. The resulting shapes for the T17
and V75 veins are more heavily influenced by geology as opposed to
previous models which were largely grade driven. This has resulted in
smoother, higher grade veins that are only slightly narrower than in the
previous model. The implications are that we can use longhole mining
methods more extensively and bring new ounces into the mine plan which
had previously been below the cut-off grade (see Figure 1). The bottom
line is that we have 32% more mineable ounces for the two veins tested."
Figure 1 is also available at
https://www.dalradian.com/news-and-events/news-releases/news-releases-details/September-11-2017-News-Release-Figures/.
The sensitivity study estimation announced today does not represent a
new resource update. However, the Company expects that this revised
wireframing approach will be used in the updated resource estimate
planned once the current drill program is completed and expects similar
positive results from the other modelled veins.
Table 1: Comparative V75 Vein Estimates
Comparison of V75 Mineral Resource 2016 with revised
mineral modeling estimates 2017
2016 Mineral Resource 2017 Estimates % Change
Mineral
Resource Tonnes Au Au Oz Tonnes Au Au Oz Au
Category (' 000 t) GPT (' 000 oz) (' 000 t) GPT (' 000 oz) Tonnes GPT Au Oz
Measured &
Indicated 497 13.15 210 377 17.88 217 -24% 36% 3%
Inferred 1,085 9.57