Rockface continues to deliver with these spectacular high grade drill results.
These latest results from Rockface are, IMHO, particularly exciting when layered on top of the results from the methodical and comprehensive drill program started in 2015 with Hole 171 and they begin to tell an exciting story about the potential prospectivity of the JERVOIS deposit.
This graphic from the May 2017 AGM presentation shows a conceptual model of a heat source for fluid migration and massive sulphide mineralization --hot feeder zones, higher grades at depth closer to the source??
Keith Mayes produced an informative AGES 2017 paper on the Rockface discovery.
https://geoscience.nt.gov.au/gemis/ntgsjspui/bitstream/1/85123/3/MayesAGES2017_paper.pdf
Morgan’s calls the latest core photos “geo-porn”.
The style of mineralisation encountered in KJCD171 andsubsequent holes is very similar to the high grade magnetite/chalcopyritemineralisation observed at the northern end of the Reward deposit that hasresponded very well to DHEM.
And there is every reason to think this style ofmineralization is repeated at depth in other deposits along the J-curve, IMHO.
Rockface
I went back over past announcements to confirm grades haveincreased progressively with depth.
2017
To illustrate the trend, results of drilling since September2015 include:
·7.34m @ 1.22% copper from 0m (KJD016),
·13m @ 2.14% copper from 255m (KJCD171),
·9m @ 2.91% copper from 284m (KJCD182),
·16m @ 3.34% copper from 362m(KJCD183),
·28m @ 5.08% copper from 435m (incl.14m @ 8.89%copper from 436m) (KJCD203),
·10.5m @ 8.76% copper from 478.4m (KJCD195),
·9.4m @ 11.53% copper from 535.4m (KJCD197),
·15m @ 7.11% copper from 558m (KJCD197), and
·10.05m @ 8.99% copper from 645.65m (KJCD201).
All intersections have reported silver and gold values.
Other drill results include:
2018:
·8.24m @ 9.21% Cu, 0.19% Zn, 38.1g/t Ag, 0.29g/tAu from 587.5 m, including 4.57m @ 14.00% Cu, 53.6g/t Ag, 0.34g/t Au from588.48 m (KJCD215 Conductor 3) and 14.17m @ 4.74% Cu, 23.0g/t Ag, 0.28g/t Aufrom 610.09 m (Conductor 5)
·7.55m @ 5.43% Cu, 16.5g/t Ag, 0.35g/t Au from732.72 m, including 3.83m @ 8.81% Cu, 25.6g/t Ag, 0.58g/t Au from 734.14 m.(KJCD233)
·9.62m @ 4.63% Cu, 0.04% Pb, 1.03% Zn, 31.8g/tAg, 0.03g/t Au from 578 m, including ·4.05m @ 9.91% Cu, 0.04% Pb, 2.15% Zn, 67g/t Ag, 0.02g/t Au from 578.95 m(KJCD245)
·12.48 m @ 4.51% Cu, 0.04% Pb, 0.11% Zn, 21.5g/tAg, 0.39g/t Au from 681.37 m including 6.16 m @ 7.84% Cu, 0.07% Pb, 0.19% Zn,37.7g/t Ag, 0.66g/t Au from 684.65 m (KJCD245D2)
2021:
Copper and silver assays confirm high-grade massivesulphides
·23.6% Cu & 503 g/t Ag over 3.5m1 from725.35m downhole
·Includes 37.4% Cu & 1,106 g/t Ag over 1.51mfrom 725.35m downhole
·Includes 40.9% Cu & 1,427 g/t Ag over 0.78mfrom 725.35m downhole
·40.9% Cu is the highest assay ever obtained inJervois drilling
New Intersection of massive sulphides extends high-gradezone 40 m up-plunge · Fourmassive sulphide drill intercepts now extend over 85 m up and down plunge · Deposit remains open atdepth and down-plunge to west-south-west
Reward North and Reward Deeps
The Down Hole Electromagnetic (DHEM) surveys Reward Northand Reward Deeps indicated the presence of strongly conductive material with asimilar signature to the Rockface high grade copper mineralization
Hole KJCD373 tested the northern perimeter of the RewardsDeep Lode at a depth of approximately 400m below surface and confirmed thecontinuity of Rewards Deep at this location.
KJCD373 intercepted
12.8m @3.02% Cu, 36.8g/t Ag, 0.56g/t Au from 413.9m,including 3.9m @6.54% Cu, 80.4g/t Ag, 1.38g/t Au from 422.8m
And 4.1m @7.23% Cu, 22.1g/t Ag, 2.59g/t Au from 445m,including 1.4m @ 15.78% Cu, 49g/t Ag, 5.68g/t Au from 447.6m
The high grade intercept also coincides with the interpretedhigh grade copper shoot. ..Finding that the Reward Deeps Lode is relatively enrichedwith gold corresponds well with the geological interpretation of structuralfactors that are advancing an understanding of the mineralization within theReward Deeps Lode.
IMHO Even during the development/construction phase, aparallel program of exploratory drilling of existing/greenfield deposits canadd multiples to the market value of the company.
And Rockface may be the prospect which begins to inform usof how a world class multi-decade high grade resource was formed and of justhow valuable this resource might be.
DYOR.
(20min delay)