October 22, 2014 - Rockhaven Resources Ltd.
(TSX-V:RK) (“Rockhaven”) is pleased to announce results from the final drill hole that tested the Western BRX Zone at its 100%-owned and road-accessible Klaza property, located in the Dawson Range Gold Belt of southern Yukon. Drilling in the Western BRX Zone has returned numerous high-grade gold and silver intercepts during the 2014 exploration season (see July 15th, July 22nd, July 29th and October 6th 2014 news releases). The final hole intersected high-grade precious and base metal mineralization 500 m down-dip from surface, further supporting the Carbonate Base Metal (CBM) Gold classification that has been proposed as the deposit model at the Klaza property.
News Release Highlights:
- KL-14-238 returned 16.29 g/t gold, 1,435 g/t silver, 5.57% lead and 6.23% zinc over 1.37 m within an 18.5 m wide mineralized complex;
- This is the deepest intercept obtained to date and clearly demonstrates depth potential at Western BRX and other zones on the property; and,
- Mineralization is consistent with the Carbonate Base Metal Gold model, which predicts multiple zones with deep roots.
“The intercept in KL-14-238 is a game changer” stated Matt Turner, CEO of Rockhaven Resources. “It greatly increases the known depth extent of the precious metal-rich vein/breccia system and supports the CBM classification, making Klaza a truly unique high-grade deposit for the Northern Cordillera.”Western BRX Zone
The Western BRX Zone was the main target of the 2014 diamond drill program. A total of 9 excavator trenches and 40 diamond drill holes have traced mineralization over a 500 m strike length and from surface to a maximum depth of 500 m down-dip. Mineralized veins are emplaced adjacent to a feldspar porphyry dyke that is present throughout the zone. KL-14-238, the deepest hole completed to date at the Klaza property, intersected 16.29 g/t gold, 1,435 g/t silver, 5.57% lead and 6.23% zinc over 1.37 m within a complex of veins, breccias and dykes, which averaged 4.58 g/t gold EQ* over 18.50 m
. The high-grade precious and base metal intercept at this depth demonstrates the exceptional down-dip potential of the Western BRX Zone. None of the earlier drill holes on this high-grade target extended below 310 m down-dip from surface. The complex of veins, breccias and dykes in KL-14-238 is the widest and strongest structure intercepted to date within the Western BRX Zone.
The complete results from hole KL-14-238 are shown in the table below. Maps, sections, core photos and assay results for work completed since 2010 can be viewed at Rockhaven’s website atwww.rockhavenresources.com
+ Represents the intercepted length. True widths are estimated to be approximately 80-90% of the interval.
|Drill Hole||Zone ID||From|
|Gold (g/t)||Silver (g/t)||Gold EQ (g/t)*||Lead|
*Gold equivalence (EQ) has been calculated using metal prices of $1200 per ounce gold and $24.00 per ounce silver, to be consistent with earlier calculations and assumes 100% recoveries of both metals. Lead and zinc assays were not used in the calculation of gold equivalence. Carbonate Base Metal Gold Deposit Model
The Klaza property hosts CBM-style mineralization within multiple, sub-parallel vein and breccia zones. CBM’s are a recently recognized sub-class of epithermal deposits that encompass a family of similar deposits located around the Pacific Rim. Multi-million ounce gold deposits classified as CBM include Barrick Gold’s Porgera Mine (Papua New Guinea), Rio Tinto’s formerly producing Kelian Mine (Indonesia) and Continental Gold’s Buritica project (Columbia).
Klaza and other CBM deposits feature multiple precious metal-rich structures that are formed peripheral to mineralized porphyry systems. The presence of carbon dioxide gas within the mineralizing hydrothermal fluids is key in facilitating precious metal deposition over large vertical extents, often in excess of one kilometre. Gold and silver are generally well liberated in this type of deposits, and elevated levels of lead, zinc and copper are common.
Nine main mineralized structures and several subsidiary structures have been identified at the Klaza property within an area 4 km long and up to 2 km wide. The most extensively explored zones (BRX and Klaza) have been traced over 2.4 km strike lengths and to a depth of 500 m down-dip. Recently completed geophysical surveys suggest there is good potential for more discoveries within known areas of mineralization, and in undrilled areas along strike and further into the hanging wall and footwall of the system.
Within high-grade parts of the zones, deportment and quantitative mineralogy studies show that gold largely occurs as native gold or electrum, with a high degree of liberation. Silver mainly occurs with pyrargyrite, tetrahedrite and electrum, which are also well liberated from gangue and non-ore sulphide minerals. Copper mineralization is strongest near the porphyry centre in the eastern portion of the property, while lead and zinc contents dramatically increase in distal parts of the system. Highly elevated lead and zinc assays are often associated with high-grade gold and silver results.
All analyses for rock and core samples from the 2014 program were performed by ALS Minerals with sample preparation in Whitehorse and assays and geochemical analyses in North Vancouver. Core samples are routinely analyzed for gold by fire assay followed by atomic absorption (Au-AA24) and 48 other elements by inductively coupled plasma-mass spectrometry (ME-MS61). Samples that exceed the detection limits of the routine methods are assayed for silver, copper, lead and zinc by inductively coupled plasma-atomic emission spectroscopy (Ag/Cu/Pb/Zn - OG62) and gold by gravimetric analysis (Au-GRA22). Rigorous procedures are in place regarding sample collection, chain of custody and data entry. Certified assay standards, coarse reject duplicates, field duplicates and blanks are routinely inserted into the sample stream to ensure integrity of the assay process. All of the results reported have passed the QAQC screening.
The 2014 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 is a well-funded company focused on growth through exploration of its wholly-owned projects. For additional information concerning Rockhaven or its various exploration projects please visit Rockhaven’s website at www.rockhavenresources.com
Matthew Turner, CEO and DirectorRockhaven Resources Ltd.
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