Rockhaven Substantially Upgrades Gold and Silver Mineral Resources at its Klaza Project, Yukon 686,000 Indicated and 507,000 Inferred Gold Ounces
1016 – 510 West Hastings Street
Vancouver, BC V6B 1L8
604-687-2522
www.rockhavenresources.com
Rockhaven Substantially Upgrades Gold and Silver Mineral Resources
at its Klaza Project, Yukon
686,000 Indicated and 507,000 Inferred Gold Ounces
June 21, 201 8 - Rockhaven Resources Ltd. (TSX-V:RK) (“Rockhaven”) is pleased to
announce updated Mineral Resource estimate s for the high-grade Western BRX, Central BRX,
Central Klaza, and Western Klaza zones at its 100%-owned and road accessible Klaza property ,
located in the Dawson Range Gold Belt of southern Yukon.
The updated Mineral Resource estimates incorporate results from approximately 13,300 m of in-
fill and expansion diamond drilling completed subsequent to the 2015 Mineral Resource
estimate, and utilizes results from recent metallurgical test work to revise cut-off grades. Bulk
tonnage low-grade mineralization in the Eastern Zones requires additional sampling, drilling and
modeling, and is not included in these Mineral Resource estimates.
Highlights from this news release include:
Indicated Mineral Resources of 4.5 Mt containing 686,000 oz gold and 14,071,000 oz
silver (grading 4.8 g/t gold and 98 g/t silver) or 907,000 oz gold equivalent (grading
6.3 g/t gold equivalent);
Inferred Mineral Resources of 5.7 Mt containing 507,000 oz gold and 13,901,000 oz
silver (grading 2.8 g/t gold and 76 g/t silver) or 725,000 oz gold equivalent (grading
3.9 g/t gold equivalent); and,
Pit-constrained resources significantly increased in tonnes and grade compared to previous
Mineral R esource estimate s, including the Western BRX Zone with 759 kt at an
average grade of 9.5 g/t gold, totaling 232,000 oz gold in the Indicated category.
Table 1: Mineral Resource Estimate Summary, June 5, 20181,5
Tonnes
Grade Contained Metal
Au Ag Pb Zn AuEQ4 Au Ag Pb Zn AuEQ4
(kt) (g/t) (g/t) (%) (%) (g/t) (koz) (koz) (klb) (klb) (koz)
Indicated3 4,457 4.8 98 0.7 0.9 6.3 686 14,071 73,268 92,107 907
Inferred3 5,714 2.8 76 0.6 0.7 3.9 507 13,901 77,544 89,176 725
1 CIM Definition Standards (2014) were used for reporting the Mineral Resources. Using drilling results to December 31, 2017. The Qualified
Persons are Adrienne Ross, P.Geo. of AMC Mining Consultants (Canada) Ltd , and Nicholas Ingvar Kirchner, FAusIMM, MAIG. of AMC
Mining Consultants Pty Ltd.
2 Near surface Mineral Resources are constrained by an optimized pit shell at a metal prices of $1,400/oz Au, $19/oz Ag, $1.10/lb Pb, and
$1.25/lb Zn.
3
Cut-off grades applied to the pit-constrained and underground resource are 1.0 g/t and 2.3 g/t AuEQ respectively.
4 Gold equivalent values assume $1,400/oz Au, $19/oz Ag, $1.10/lb Pb, and $1.25/lb Zn, and variable recoveries for the different metals.
5 Numbers may not add up due to rounding. Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability. All
metal prices are quoted in US$ at an exchange rate of $0.80 US to $1.00 Canadian.
2
“The Klaza project ho sts high-grade gold and silver resources that are near surface, road
accessible and located wit hin one of the safest mining jurisdictions in the world ,” stated Matt
Turner, CEO of Rockhaven Resources. “ We have upgraded much of our Inferred Mineral
Resource to the Indicated category for $4 per oz gold or at a rate of 52 oz gold per metre drilled.*
Additionally, the conversion of high-grade resources from underground to open pittable should
have major economic benefits for the project.”
The following table reports the Mineral Resources by potential mining method.
Table 2: Mineral Resource Estimate by mining method, June 5, 20181,5
Category Tonnes
Grade Contained Metal
Au Ag Pb Zn AuEQ4 Au Ag Pb Zn AuEQ4
(kt) (g/t) (g/t) (%) (%) (g/t) (koz) (koz) (klb) (klb) (koz)
Indicated
Pit-
Constrained2,3 2,447 5.3 90 0.7 1.0 6.7 414 7,096 39,143 52,935 529
Underground3 2,010 4.2 108 0.8 0.9 5.8 272 6,974 34,125 39,172 378
Total 4,457 4.8 98 0.7 0.9 6.3 686 14,071 73,268 92,107 907
Inferred
Pit-
Constrained2,3 1,754 2.6 43 0.4 0.5 3.3 147 2,429 14,897 18,599 187
Underground3 3,960 2.8 90 0.7 0.8 4.2 359 11,472 62,647 70,578 538
Total 5,714 2.8 76 0.6 0.7 3.9 507 13,901 77,544 89,176 725
* See footnotes under Table 1
About the Klaza Deposit
The Klaza project hosts a large hy drothermal system that is concentrated within a 4 km long by
3 km wide structural corridor. Current Mineral Resource areas have only been systematically
explored to about 275 m below surface, but well mineralized intersections occur as deep as
450 m. Eleven k nown mineralized zones have been identified within the corridor and all are
open for expansion along strike and to depth. The deposit model for the Klaza deposit suggest
the zones could be well mineralized to depths of 1,000 m or more below surface.
In spring 2016, Rockhaven completed a Preliminary Economic Asse ssment (PEA) of the Klaza
property in order to demonstrate project viability and recognize key economic sensitivities . The
PEA identified several opportunities to improve future economics, including:
Exploring alternate processing methods that could lower overall processing costs and
allow lower-grade mineralization, which was excluded from the PEA , to be effectively
processed;
Better definition of near surface mineralization in order to maximize the open -pit
potential of the Mineral Resources; and,
Infill drilling in order to confirm grade continuity within the deposit and increase the
grade of the known high-grade veins.
In 2016 and 2017, Rockhaven completed 13,291 m of infill and expansion diamond drilling ,
within and near to the 2015 Mineral Resources . This drilling successfully demonstrated the
continuity of high-grade structures and identified much higher-grade areas within the known vein
zones. Examples of these high -grade intersections include 182 g/t gold and 231 g/t silver over
3
0.61 m in Central Klaza; and, 94 g/t gold and 545 g/t silver over 2.63 m in Western BRX. The
drilling also outlined lower -grade mineralization in the hanging wall and footwall of the Central
Klaza Zone, and provided material for metallurgical testing.
The eastern portion of the Klaza vein system (Eastern Zones) comprises multiple, sub -parallel
veins and veinlets, and includes the Eastern Klaza, Eastern BRX, Pika, Stroshein , and part of the
AEX zones. All of these zones are open to the east, towards the mostly untested Kelly Porphyry.
Previously, these zones were assumed to be similar to the discreet high -grade vein zones to the
west (Western and Central portions of the BRX and Klaza) and were sampled, targeted and
modeled using this assumption. The recent drilling and metallurgical test work have
demonstrated that the mineralization is structurally, mineralogically and metallurgically different
from the western zones. Th is area has bulk tonnage potential and requires additional sampling,
drilling and modelling before a Mineral Resource estimate can be finalized.
Metallurgical testwork completed in 2017 demonstrates that dense media separation is effective
in the Central Klaza, Western BRX, and Eastern zones (see Rockhaven news release dated April
19, 2018). This test work also showed that the Eastern Zones responded well to direct cyanide
leaching. The new processing techniques identified by the test work allow for lower cut -off
grades to be applied to the current Mineral Resource estimate s. The application of p re-
concentration should allow for less selective , lower cost mining methods in both underground
and open pit workings in future economic studies.
Next Steps
The current Mineral Resource estimate s and re cent metallurgical test work have highlighted
multiple priority targets for further resource expansion and definition. These include:
Continued conversion of Inferred Mineral Resources to Indicated Mineral Resources;
Additional definition and expansion drilling in the Eastern Zones to prepare for a future
Mineral Resource estimate;
Exploration drilling of near surface mineralized zones that parallel the Mineral
Resources, including high-grade structures identified by the 2017 program;
Expansion of Inferred Mineral Resources below the Western and Central portions of the
BRX and Klaza zones; and,
Expansion of the area of fracture -style mineralization surrounding the known Eastern
Zones.
Resource Methodology
The 2018 Mineral Resource estimate was reported by AMC Mining Consultants (Canada) Ltd.
and AMC Mining Consultants Pty Ltd. (AMC) and estimated using a combination of Ordinary
Kriging (OK), Localized Multiple Indicator Kriging (LMIK) and restr icted Ordinary Kriging
(ROK).
The estimates were based on a revised geological model which included 2016 and 2017 drilling .
Mineralization wireframes were constructed by Archer, Cathro & Associates (1981) Limited
using GEMS software for the Central BRX, Western BRX, Central Klaza and Western Klaza
4
areas based on lithological, structural and assay data. In total, 25 separate wireframes were
constructed that modeled zones of continuous mineralization.
AMC completed an OK estimate on t hese domains. Prior to estimation, drillhole data was
composited to 1 m and s amples were capped for all variables within each domain where
required.
In addition to the OK estimate, a broad mineralized envelope was constructed by AMC to
encompass mineral ization i n parts of the Central Klaza zones where mineralization comprises
closely spaced narrow veins , around which it is difficult to construct wireframes . These
envelopes were constructed assuming a nominal 0.3 g/t gold boundary to define the outer lim its
of these systems, and exclude vein zones defined by the high-grade wireframes.
LMIK was used to estimate gold and silver Mineral Resources and ROK for other elements
within the mineralized envelope. Samples were composited to 3 m within these envelopes.
A parent block dimensions of 25 mE x 12.5 mN x 5 mRL was assumed for the Klaza Block
model. Indicator thresholds were selected based on the geostatistical characteristics of each
domain, and were selected to discretize the profiles at slope changes and key grade thresholds.
The indicator estimates were modified with a change of support correction to emulate a selective
mining unit (SMU) scale mining block for moderate -scale, selective open pit mining on 5 m
benches, and assessment for potent ial underground mining. The resultant MIK estimates were
localized for the final LMIK model into SMU blocks having dimensions of 6.25 mE x 3.125 mN
x 5 mRL.
Densities of individual blocks were calculated using a regression formula based on recorded
density measurements and iron, lead, zinc and copper grades.
Tables showing the Mineral Resource for each zone included can be found below and on
Rockhaven’s website at www.rockhavenresources.com.
Metallurgy
The Mineral Resource estimate has been prepared using results from recent metallurgical
testwork, (see Rockhaven news release dated April 19, 2018). Dense media separation has been
shown to be effective in the Western BRX and Central Klaza zones.
Qualified Persons
The Mineral Resource estimate was completed by AMC.
The OK Mineral Resource estimate disclosed in this press release for the Klaza Project have
been prepared by Dr. A. Ross, P.Geo. , an employee of AMC Mining Consultants (Canada) Ltd. ,
who is independent of Rockhaven and a "Qualified Person" for the purpose of National
Instrument 43-101. Dr. Ross has read and approved the content of this press release as it pertains
to the disclosed Mineral Resource estimate.
5
The LMIK and ROK Mineral Resource estimate disclosed in this press release for the Klaza
Project have been prepared by Mr Nicholas Ingvar Kirchner , an employee of AMC Mining
Consultants Pty Ltd., who is independent of Rockhaven and a "Qualified Person" for the purpose
of National Instrument 43 -101. Mr Kirchner has read and approved the content of this press
release as it pertains to the disclosed Mineral Resource estimate.
All other technical information in this news release has been approved by Matthew R . Dumala,
P.Eng., a geological engineer with Archer, Cathro & Associates (1981) Limited and qualified
person for the purpose of National Instrument 43-101.
Further details supporting the geological model, estimation procedure and metallurgical testwork
will be available in a National Instrument 43 -101 Technical Report . The report will be posted
under the Rockhaven profile at www.sedar.com within 45 days from the date of this news
release.
* Costs to upgrade the Mineral Resources from inferred to indicated was calculated using a cumulative
exploration cost for the Klaza Project of $2,793,000 based on 13, 291 m of infill drilling at an average
cost of $210/m. Costs included drilling, assays, labour , camp costs, fuel, general camp con sumables and
winter office work.
About Rockhaven
Rockhaven Resources Ltd. is a mineral exploration company focused on growth through the
advancement of its Klaza project. For additional information concerning Rockhaven or its Klaza
project please visit Rockhaven’s website at www.rockhavenresources.com.
Matthew Turner
President, CEO and Director
Rockhaven Resources Ltd.
T:604-687-2522
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.
This news release may contain forward looking statements based on assumptions and judgments of management
regarding future events or results that may prove to be inaccurate as a result of exploration and other risk factors
beyond its control, and actual results may differ materially from the expected results.
6
Table 4: Western BRX Mineral Resource Estimate, June 5, 20181,5
Tonnes
Grade Contained Metal
Au Ag Pb Zn AuEQ4 Au Ag Pb Zn AuEQ4
(kt) (g/t) (g/t) (%) (%) (g/t) (koz) (koz) (klb) (klb) (koz)
Indicated
Pit-
Constrained2,3
759 9.5 109 0.9 1.0 11.2 232 2,671 15,312 16,201 273
Underground3 510 6.7 122 0.9 1.1 8.5 110 2,001 10,341 11,920 140
Total
(Indicated)
1,269 8.4 115 0.9 1.0 10.1 341 4,672 25,653 28,120 414
Inferred
Pit-
Constrained2,3
369 4.7 54 0.5 0.6 5.6 56 644 3,915 4,884 67
Underground3 974 3.7 93 0.7 0.9 5.2 116 2,906 16,044 19,976 162
Total (Inferred) 1,343 4.0 82 0.7 0.8 5.3 172 3,550 19,958 24,859 228
* See footnotes under Table 1
Table 5: Central BRX Mineral Resource Estimate, June 5, 20181,5
Tonnes
Grade Contained Metal
Au Ag Pb Zn AuEQ4 Au Ag Pb Zn AuEQ4
(kt) (g/t) (g/t) (%) (%) (g/t) (koz) (koz) (klb) (klb) (koz)
Indicated
Pit-
Constrained2,3
289 2.9 150 0.8 1.3 5.1 27 1,396 5,029 8,141 47
Underground3 424 1.9 106 1.0 1.1 3.6 26 1,443 9,793 10,171 50
Total
(Indicated)
713 2.3 124 0.9 1.2 4.2 53 2,838 14,822 18,312 97
Inferred
Pit-
Constrained2,3
238 1.9 99 0.7 0.8 3.4 15 760 3,795 3,993 26
Underground3 1,187 1.7 102 1.0 0.9 3.3 64 3,896 26,215 23,401 126
Total (Inferred) 1,425 1.7 102 1.0 0.9 3.3 79 4,656 30,010 27,394 152
* See footnotes under Table 1
7
Table 6: Western Klaza Mineral Resource Estimate, June 5, 20181,5
Tonnes
Grade Contained Metal
Au Ag Pb Zn AuEQ4 Au Ag Pb Zn AuEQ4
(kt) (g/t) (g/t) (%) (%) (g/t) (koz) (koz) (klb) (klb) (koz)
Indicated
Pit-
Constrained2,3
139 4.8 234 0.8 0.9 7.8 21 1,043 2,388 2,722 35
Underground3 361 4.0 181 0.6 0.7 6.4 47 2,099 4,440 5,773 74
Total
(Indicated)
500 4.2 195 0.6 0.8 6.8 68 3,142 6,828 8,495 109
Inferred
Pit-
Constrained2,3
2 1.8 118 0.3 0.6 3.3 0 8 12 26 0
Underground3 227 3.9 170 0.5 0.8 6.1 28 1,240 2,440 3,817 44
Total (Inferred) 229 3.8 169 0.5 0.8 6.0 28 1,248 2,452 3,842 44
* See footnotes under Table 1
Table 7: Central Klaza Mineral Resource Estimate, June 5, 20181,5
Tonnes
Grade Contained Metal
Au Ag Pb Zn AuEQ4 Au Ag Pb Zn AuEQ4
(kt) (g/t) (g/t) (%) (%) (g/t) (koz) (koz) (klb) (klb) (koz)
Indicated
Pit-
Constrained2,3
1,260 3.3 49 0.6 0.9 4.3 133 1,987 16,414 25,871 173
Underground3 715 3.9 62 0.6 0.7 5.0 90 1,432 9,550 11,309 114
Total
(Indicated)
1,976 3.5 54 0.6 0.9 4.5 223 3,419 25,964 37,180 288
Inferred
Pit-
Constrained2,3
1,145 2.1 28 0.3 0.4 2.6 76 1,017 7,176 9,696 94
Underground3 1,572 3.0 68 0.5 0.7 4.1 151 3,431 17,948 23,385 206
Total (Inferred) 2,717 2.6 51 0.4 0.6 3.4 227 4,448 25,124 33,081 301
* See footnotes under Table 1