Rockhaven Resources Ltd. Announces Trench Grading 5.61 g/t Gold and 300 g/t Silver (11.61 g/t Gold Eq) Over 18.79 M and Posit...
24 Settembre 2013 - 2:45PM
Marketwired Canada
Rockhaven Resources Ltd. (TSX VENTURE:RK) ("Rockhaven") is pleased to announce
the initial 2013 excavator trench assays and preliminary gravity and bulk
sulphide flotation metallurgical results from one of eight known mineralized
zones on its 100% owned Klaza gold-silver property, located in the Dawson Gold
Belt of southwestern Yukon.
News Release Highlights:
-- Excavator trenches have successfully confirmed continuity of the Central
and Western Klaza Zones with new high-grade exposures returning:
-- 5.61 g/t gold and 300 g/t silver (11.61 g/t gold EQ) over 18.79 m in
TR-51
-- 16.20 g/t gold and 158 g/t silver (19.36 g/t gold EQ) over 6.84 m in
TR-52
-- 25.70 g/t gold and 449 g/t silver (34.68 g/t gold EQ) over 2.27 m in
TR-66
-- 8.29 g/t gold and 295 g/t silver (14.20 g/t gold EQ) over 4.60 m in
TR-69
-- 16.76 g/t gold and 1052 g/t silver (37.80 g/t gold EQ) over 3.03 m
in TR-70
-- Preliminary sequential gravity and flotation tests on sulphide-bearing
drill core from holes in this area produced high combined recoveries of
97.3% for gold and 99.0% for silver.
"Detailed excavator trenching at the highly prospective Central and Western
Klaza Zones has identified priority near-surface drill targets for 2014," stated
Matt Turner, CEO of Rockhaven. "Also, we are highly encouraged by the
preliminary metallurgical test results, which suggest gold and silver should be
recoverable through conventional flotation techniques."
Klaza Zone
The recently completed excavator trenching has increased the known strike length
of the Klaza Zone to 2,400 m. The zone hosts three distinct styles of gold and
silver mineralization along its length. The Western Klaza Zone consists of
discrete veins that tend to be higher grade than those observed further to the
east and is considered to be a high-grade underground target. The Central Klaza
Zone comprises a system of veins, breccias and sheeted veinlets that are
prospective for selective extraction by open pit methods. The Eastern Klaza Zone
is characterized by sheeted vein complexes and surrounding alteration envelopes,
which coalesce to form 20 to 100 m thick mineralized bands. These bands are
being assessed as potential bulk tonnage targets and will be further discussed
in a later news release once all 2013 assays are received and interpreted.
Infill and step-out trenching in 2013 at the Central and Western Klaza Zones
confirmed continuity of the mineralized structure and further delineated areas
of high-grade gold and silver that were partially outlined by widely spaced
trenches and drill holes in 2011 and 2012. Additionally, two northeast trending
off-set faults have been identified that may be important in locating the open
western extensions of the Klaza Zone and the other mineralized structures
identified on the property.
A total of eight excavator trenches targeted this area in 2013, and the most
significant assay results are shown in the table below. Maps showing the
locations of the trenches and nearby drill holes can be viewed on Rockhaven's
website at www.rockhavenresources.com.
---------------------------------------------------------------------------
Trench Zone From To Interval Gold Silver Gold
ID ID (m) (m) (m) degrees (g/t) (g/t) EQ(i)
---------------------------------------------------------------------------
---------------------------------------------------------------------------
---------------------------------------------------------------------------
TR-13-51 Central Klaza 0.00 1.00 1.00 2.68 97.30 4.63
------------- -------------------------------------------------
and 11.19 29.98 18.79 5.61 300 11.61
------------- -------------------------------------------------
including 11.19 12.19 1.00 0.90 2710 55.10
------------- -------------------------------------------------
including 26.53 28.03 1.50 63.30 1700 97.30
---------------------------------------------------------------------------
---------------------------------------------------------------------------
TR-13-52 Central Klaza 3.75 10.59 6.84 16.20 158 19.36
------------- -------------------------------------------------
including 3.75 6.09 2.34 13.50 155 16.60
------------- -------------------------------------------------
including 7.49 10.59 3.10 25.40 230 30.00
---------------------------------------------------------------------------
---------------------------------------------------------------------------
KL-13-64 Western Klaza 1.00 1.80 0.80 1.44 29.20 2.02
---------------------------------------------------------------------------
---------------------------------------------------------------------------
KL-13-65 Western Klaza 4.00 4.80 0.80 2.16 10.85 2.38
---------------------------------------------------------------------------
---------------------------------------------------------------------------
KL-13-66 Central Klaza 1.00 21.99 20.99 3.58 75.53 5.09
------------- -------------------------------------------------
including 1.00 2.00 1.00 3.41 121 5.83
------------- -------------------------------------------------
including 18.72 20.99 2.27 25.70 449 34.68
---------------------------------------------------------------------------
---------------------------------------------------------------------------
KL-13-69 Western Klaza 5.16 9.76 4.60 8.29 295 14.20
---------------------------------------------------------------------------
---------------------------------------------------------------------------
KL-13-70 Western Klaza 2.50 5.53 3.03 16.76 1052 37.80
------------- -------------------------------------------------
including 2.50 4.00 1.50 24.70 2000 64.70
------------- -------------------------------------------------
including 4.00 5.53 1.53 8.98 123 11.44
---------------------------------------------------------------------------
---------------------------------------------------------------------------
KL-13-71 Western Klaza 0.00 1.80 1.80 4.82 53.92 5.90
---------------------------------------------------------------------------
degrees Represents the excavator trench sample length. True widths are
estimated to be approximately 80-90% of the interval.
(i)Gold equivalence has been calculated using metal prices of $1300 per ounce
gold and $26.00 per ounce silver, to be consistent with earlier calculations. It
assumes 100% recoveries.
Preliminary Sequential Gravity and Bulk Sulphide Flotation Test Results
Preliminary mineralogical and scoping level metallurgical tests are currently
being conducted on sulphide-bearing drill core from the Central and Western
Klaza Zones to investigate mineral associations and evaluate potential
concentration and recovery methods. Both test programs are being carried out by
SGS Mineral Services at its laboratory in Vancouver, British Columbia.
A single composite was designed to represent typical sulphide mineralization
from the Central and Western Klaza Zones using coarse reject material from 15
previously reported drill holes. This composite has a head grade of 5.06 g/t
gold and 290 g/t silver. Gold and silver deportment and quantitative mineralogy
results show that gold largely occurs as native gold or electrum, with a high
degree of liberation. Silver mainly occurs with pyrargerite, tetrahedrite and
electrum, which are also well liberated from gangue and non-ore sulphide
minerals. Mineralogy was investigated using the widely recognized quantitative
evaluation of minerals by scanning electron microscopy (QEMSCAN) technique.
Standard E-GRG (Gravity Recoverable Gold) tests were performed using three
stages of sequential separation. Results of the E-GRG tests suggest minimal gold
and silver can be recovered by gravity, with recoveries of 13.4% and 5.7%,
respectively.
Follow-up flotation testing investigated the potential to obtain a
precious-metal rich bulk sulphide concentrate. Initial rougher flotation tests
conducted on the gravity tailings showed recoveries of 96.8% gold and 98.4%
silver to a flotation concentrate, for a combined gravity/flotation recovery of
97.3% gold and 99.0% silver. Work continues to further upgrade the flotation
concentrate through cleaner flotation tests, evaluation of the impact of finer
grind sizes, and investigation of sequential flotation of sulphides. Results
from this ongoing test program will be released as they become available.
The following table summarizes the metallurgical results returned to date from
the composite of samples from the Central and Western Klaza Zones.
----------------------------------------------------------------------------
Gold Silver
----------------------------------------------------------------------------
Head Grade (g/t)(i) 5.06 290
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Gravity Recovery 13.4% 5.7%
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Rougher Flotation Recovery 96.9% 98.9%
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Rougher Concentrate Grade (g/t) 26.1 1670
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Combined Gravity & Flotation Recovery 97.3% 99.0%
----------------------------------------------------------------------------
(i)Head grade determined by fire assay with AAS finish for gold (FAA303) and
4-acid digestion with AAS finish for silver (AAS42E).
There is currently no mineral resource at the Klaza property. Recovery values
are from initial metallurgical test work and do not include potential
optimizations.
2013 Exploration Program
The 2013 field program is now completed at the road-accessible Klaza project. It
consisted of approximately 5,000 m of excavator trenching in 38 trenches that
focused on extending and confirming continuity within the Klaza and BRX Zones as
well as discovering new mineralized zones in other areas of the property that
have not been systematically explored to date. Results from the remaining 30
trenches will be released on a target by target basis once assays are received,
compiled and evaluated.
All significant assays from 2010, 2011, 2012 and 2013 diamond drilling and
excavator trenching can be viewed on the Company's website
(www.rockhavenresources.com), including geological maps, cross-sections and
assay histograms.
Trench samples included in this press release were processed in 36 sample
batches with each batch including two assay standards, two blank samples, and a
coarse reject duplicate. Analytical work was done by ALS Minerals with sample
preparation in Whitehorse and assays and geochemical analyses in North
Vancouver. All samples were routinely analyzed for gold by fire assay followed
by atomic absorption (Au-AA24) and 48 other elements by four acid digestion
(ME-MS61). All overlimit values were determined for gold by fire assay and
gravimetric finish (Au-GRA22) and for silver using Ag-OG46 and Ag-GRA21). All
gold and silver grades reported in this release were calculated from the assay
results. All standard, blank and duplicate samples passed QAQC reviews.
The 2013 program was managed by Archer, Cathro & Associates (1981) Limited
(Archer Cathro). Technical information in this news release has been approved by
Matthew R. Dumala, P.Eng., a geological engineer with Archer Cathro and
qualified person for the purpose of National Instrument 43-101.
Rockhaven Resources Ltd. is a well-managed gold and silver exploration company
focused on growth through advancing its quality portfolio of wholly-owned
projects. For additional information concerning Rockhaven Resources Ltd. or its
various exploration projects please visit Rockhaven's website at
www.rockhavenresources.com.
NEITHER THE TSX VENTURE EXCHANGE NOR ITS REGULATION SERVICES PROVIDER (AS THAT
TERM IS DEFINED IN THE POLICIES OF THE TSX VENTURE EXCHANGE) ACCEPTS
RESPONSIBILITY FOR THE ADEQUACY OR ACCURACY OF THIS RELEASE.
FOR FURTHER INFORMATION PLEASE CONTACT:
Rockhaven Resources Ltd.
Matthew Turner
CEO and Director
604-688-2568
mturner@nordacres.com
www.rockhavenresources.com
Grafico Azioni Rockhaven Resources (TSXV:RK)
Storico
Da Giu 2024 a Lug 2024
Grafico Azioni Rockhaven Resources (TSXV:RK)
Storico
Da Lug 2023 a Lug 2024
Notizie in Tempo Reale relative a Rockhaven Resources Ltd (Venture Exchange Canada (TSXV)): 0 articoli recenti
Più Rockhaven Resources Ltd. Articoli Notizie