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Erdene Continues to Define Northern Extension at Bayan Khundii Gold Project With 81 Metres of 2.6 g/t Gold Including 17 Metres of 9.2 g/t Gold

Drill Results

ERDENE RESOURCE DEVELOPMENT CORP.

Erdene Continues to Define Northern Extension at Bayan Khundii Gold

Project With 81 Metres of 2.6 g/t Gold Including 17 Metres of 9.2 g/t Gold

Halifax, Nova Scotia – July 5, 2018 - Erdene Resource Development Corp. (TSX:ERD)

("Erdene" or "Company"), is pleased to report results for the third series of drill holes from its

Q2-2018 drill program at its 100%-owned Bayan Khundii Gold P roject (“Bayan Khundii”) in

southwest Mongolia.

“The final results from our Q2 Bayan Khundii drill program have successfully confirmed both

strike and depth extensions of mineralized zones throughout the Bayan Khundii gold system

which will aid the resource estimation exercise,” said Peter Akerley, Erdene’s President and CEO.

“We have now commence d work on the maiden independent Bayan Khundii mineral resource. In

addition, on-going exploration work on our exploration licenses in the surrounding Khundii Gold

District, including a current drilling program in the central part of the greater Bayan Khun dii

license, continues to provide encouraging results, which bodes well for future discovery of

additional mineralization within the newly-defined Khundii Gold District.”

Highlights

(see attached plan maps and cross-sections for reference)

 North Midfield Zone extension to the northeast continued to demonstrate potential for a

large, high-grade zone in the northernmost portion of the Bayan Khundii gold system

o BKD-254 returned 81.4 metres of 2.6 g/t gold including 17 metres of 9.2 g/t gold

 Testing of the intersecting structures at Midfield Zone continued to provide strong results

on the eastern side of the target area:

o 51.8 metres of 2.8 g/t gold and individual samples up to 86 g/t gold (BKD-251)

 All Bayan Khundii drill results have now been delivered to RPMGlobal who has

commenced work on the maiden Bayan Khundii mineral resource estimate

 Drilling is underway on multiple reconnaissance drill targets within the greater Bayan

Khundii license area

Summary of Bayan Khundii Drill Program

The Company’s Q2-2018 Bayan Khundii drill program, which commenced on April 11, 2018, was

designed to test high priority structural targets, principally within the North Midfield and Midfield

zones; complete closer -spaced drilling within the Striker, West Striker, Midfield, and North

Midfield zones; and to test select areas within the larger 1.4 kilometre trend that demonstrate good

potential for establishing additional extensions to gold mineralized zones.

Today’s results are fo r the third batch of nine holes (BKD-248 to BKD-255) including one hole

extension (BKD-145 Ext) for a total of 1,799 metres. The Company has completed a total of

4,584 metres at Bayan Khundii in 2018 and a total of 42, 656 metres since the project was

discovered in 2015. All holes were drilled at a 45 to 85 degree angle to intersect the interpreted dip

of the high-grade quartz veins and mineralized breccias.

Discussion of Drill Results

The tables below include drill result highlights of the nine holes reported in this release, followed

by a description of results. For reference see the attached plan maps and cross-sections.

North Midfield Zone (Table 1)

Drill Hole From (m) To (m) Interval (m) (1) Gold (g/t)

BKD-254 102.6 184 81.4 (2) 2.59

incl 112 129 17 9.2

incl 112 114 2 50.9

and 116 117 1 14.7

and 122 123 1 17.1

BKD-145 (Ext) 213 231 18 1.72

incl 216 217 1 21.3

(1) Reported intervals are not true width. At this time, there is insufficient data with respect to the shape of the

mineralized system to calculate true orientations in space. They represent drill intersection widths from holes drilled at

a dip of -45 to -85 degrees and oriented to the north -northeast. The Bayan Khundii mineralization is interpreted to be

moderately dipping (approximately 40 to 50 degrees to the southwest).

(2) R eported interval includes 9.8 metres of post mineral dyke material from 141.3 to 151.1 metres depth with an

average grade of less than 0.05 g/t gold; excluding the dyke material, there is a mineralized intersection of 71.6 metres

of 2.92 g/t gold.

Hole BKD-254 was drilled as a step -out hole from BKD -179 to test for strike continuity of a 40

metre wide zone intersected in BKD -179 that averaged 3.96 g/t gold. BKD -254 intersected an

81.4 metre wide zone of mineralization, commencing at 102.6 metres depth, which returned an

average grade of 2.59 g/t gold, including a 17 metre wide zone averaging 9.2 g/t gold. These

results confirm t he continuity and grade of mineralization within this portion of the North

Midfield Zone, and demonstrate the potential for discovery of a large, high -grade zone in the

northern most portion of the Bayan Khundii gold system.

Hole BKD-145 was previously terminated at 201 metres depth after intersecting 12 metres of post-

mineralization syenite. However, subsequent drilling proximal to BKD -145 suggested the syenite

at the bottom of BKD -145 was a dyke and not the top of a larger intrusion. The Company tested

this by extending the depth of BKD -145. After drilling 15 metres of syenite , a 43 metre wide

interval of mineralized tuff was intersected before the hole terminated in syenite at 272 metres

depth. Hole BKD -145 (Ext) intersected an 18 metre wide interval, commencing at 213 metres

depth which averaged 1.72 g/t gold and included a 1 metre wide interval which returned 21.3 g/t

gold.

Midfield Zone (Table 2)

Drill Hole From (m) To (m) Interval (m) (1) Gold (g/t)

Midfield Zone

BKD-251 19 151.9 132.9 1.44

incl 93 144.8 51. 8 2.79

incl 93 94 1 86.2

and 144 144.8 0.8 11.5

Between Midfield and Striker Zones

BKD-252 72 115 43 0.42

incl 77 83 6 1.05

and 164 206 42 1.13

incl 169 171 2 14.0

West of Midfield Zone

BKD-253 116 125.5 9.5 1.11

and 162 179 17 1.66

(1) See footnote 1 in Table 1 above.

A step-out hole (BKD -251) was drilled to test for extensions of high -grade gold mineralization

previously encountered at the intersection of major northwest and northeast structures within the

Midfield Zone. Assay results from this hole confirmed a 132.9 metre wide mineralized z one,

commencing at 19 metres depth, that averaged 1.44 g/t gold, including a 1 metre wide zone that

returned 86.2 g/t gold. These results confirm continuity and grade of mineralization encountered

in previous drilling.

Hole BKD-252 was drilled between the Striker Zone and Midfield Zone to follow up on results

from previous drilling which encountered both wide mineralization zones and narrow high -grade

zones of gold mineralization. BKD -252 intersected a 42 metre wide zone averaging 1.13 g/t gold

commencing at 164 metres depth, including a 2 metre interval averaging 14.0 g/t gold. These

results confirm the continuity of broad mineralized zones and narrow high -grade zones in this part

of the Bayan Khundii gold system.

Hole BKD -253 was drilled to test the exte nsion of high -grade mineralization on the southwest

corner of the Midfield Zone. Assay results confirm ed that mineralization continues to the west

with two intervals returning 1.11 g/t gold over 9.5 metres and 1.67 g/t gold over 11 metres.

Adjacent Target Areas (Table 3)

Drill Hole From (m) To (m) Interval (m) (1) Gold (g/t)

West Striker Zone

BKD-248 86 95 9 0.60

and 130.7 142 11.3 0.42

Drill Hole From (m) To (m) Interval (m) (1) Gold (g/t)

BKD-249 67 78 11 0.36

and 146 148 2 2.02

and 270 276 6 0.46

BKD-250 91 110 19 0.58

and 138 150 12 0.53

and 242 250.9 8.9 0.42

East of Striker Zone

BKD-255 126 131 5 0.51

(1) See footnote 1 in Table 1 above.

Assay results for three holes drilled in the West Striker Zone (BKD -248, BKD-249, BKD -250)

returned several zones from 6 to 19 metres wide , which ranged from 0.36 to 0.60 g/t gold. These

results are consistent with previous drilling and confirm the widespread nature of gold

mineralization in this zone.

Regional District Deposits and Exploration

Over the past several years Erdene has discove red a new gold district (“The Khundii Gold

District”) in southwest Mongolia that includes seven targets, two of which are considered

significant prospects for development , and are being advanced toward a global mineral resource

estimate in 2018; Bayan Khundii and Altan Nar.

Altan Nar, located 16 kilometres north of Bayan Khundii is an intermediate sulfidation gold -

polymetallic deposit which was recently reported (link to May 10 , 2018 release) to contain an

indicated gold equivalent (“AuEq”) resource of 452,900 ounces (“oz”) AuEq averaging 2.8 g/t

AuEq (2.0 g/t gold, 14.8 g/t silver and 1.2% combined lead and zinc) and an inferred resource of

277,100 oz AuEq averaging 2.5 g/t AuEq (1.7 g/t gold, 7.9 g/t silver and 1.4% combined lead and

zinc), within a total resource of 5.0 million tonnes (“Mt”) indicated and 3.4 Mt inferred. The

indicated resource includes 317,700 oz gold (at 2.0 g/t gold), 31,600 tonnes (“t ”) zinc, 29,000 t

lead, and 2.35 million oz silver, while the inferred resource contains 185,700 oz gold (at 1.7 g/t

gold), 23,700 t zinc, 22,300 t lead, and 865,900 oz silver.

A regionally-focused drilling program commenced today with plans for additional drilling at the

Company’s early-stage Altan Arrow gold-silver project, 3.5 kilometres north of Bayan Khundii, to

follow-up on high -grade results intersected from reconnaissance drilling in Q4 -2017. Results

from previous drilling included hole AAD -12 which intersected 70 g/t gold over 2 metres, and

drilling of a new target area 300 metres west which previously returned 39 g/t gold over 1 metre,

near-surface (hole AAD-11).

The Company will also carry out scout drilling at its Khundii North gold prospect, 2.5 kilometres

east of Altan Arrow, where gold -in-soil anomalism has now been traced over 1 kilometre,

containing areas of quartz stockwork and chalcedonic quartz with hematite breccia clasts that

returned up to 22 g/t gold from initial rock chip sampling. Several areas of strong illite alteration,

associated with a magnetic low and resembling the alteration at the Bayan Khundii project, located

3.5 kilometres to the southwest, were noted along a major northeast -trending structure to the

northwest of the main quartz breccia zone and will be drill tested.

In addition to the its 100% -owned gold projects, the Company has recently acquired a 51%

interest in the Ulaan license, a 1,780 hectare exploration property located immediately west of its

Bayan Khundii license , with t he option to acquire up to 100% . This license has no history of

trenching or drilling, and is host to a very large, 3 -kilometre diameter, intense alteration zone with

characteristics thought to be related to a porphyry complex at depth. The Company is currently

evaluating geological, geophysical and geochemical data collected during Q4 -2017 and Q2 -2018

exploration programs, and will use the results from this work to develop a maiden drill program

for the Ulaan license, anticipated for Q3 or Q4 2018.

Through its alliance with Teck Resources Limited (“Alliance”), Erdene also intends to continue to

assess regional opportuniti es for porphyry -related copper-gold mineralization within the larger

Edren Terrane and intends to pursue acquisitions as opportunities arise in the Alliance’s area of

interest in southwest Mongolia. Erdene’s Bayan Khundii, Altan Nar, Altan Arrow, Ulaan, Kh uvyn

Khar and Zuun Mod properties are excluded from the Teck Alliance areas of interest.

Qualified Person and Sample Protocol

Michael MacDonald, P.Geo. (Nova Scotia), Vice President Exploration for Erdene, is the

Qualified Person as that term is defined in National Instrument 43 -101 and has reviewed and

approved the technical information contained in this news release. All samples have been assayed

at SGS Laboratory in Ulaanbaatar, Mongolia. In addition to internal checks by SGS Laboratory,

the Company incorporates a QA/QC sample protocol utilizing prepared standards and blanks. All

samples undergo standard fire assay analysis for gold and ICP -OES (Inductively Coupled Plasma

Optical Emission Spectroscopy) analysis for 33 additional elements. For samples that initially

return a grade greater than 5 g/t gold, additional screen -metallic gold analysis is carried out which

provides a weighted average gold grade from fire assay analysis of the entire +75 micron fraction

and three 30-gram samples of the -75 micron fraction from a 500 gram sample.

Erdene’s drill core sampling protocol consisted of collection of samples over 1 or 2 m intervals

(depending on the lithology and style of mineralization) over the entire length of the drill hole,

excluding minor post -mineral lithologies and un -mineralized granitoids. Sample intervals were

based on meterage, not geological controls or mineralization. All drill core was cut in half with a

diamond saw, with half of the core placed in sample bags and the remaining half secu rely retained

in core boxes at Erdene’s Bayan Khundii exploration camp. All samples were organized into

batches of 30 including a commercially prepared standard, blank and either a field duplicate,

consisting of two quarter -core intervals, or a laboratory duplicate. Sample batches were

periodically shipped directly to SGS in Ulaanbaatar via Erdene’s logistical contractor, Monrud Co.

Ltd.

About Erdene

Erdene Resource Development Corp. is a Canada -based resource company focused on the

acquisition, exploration, and development of base and precious metals in underexplored and

highly prospective Mongolia. The Company has interests in four exploration licenses and a mining

license in southwest Mongolia, where exploration success has led to the discovery and definition

of several prospects and deposits including: Bayan Khundii – the Company’s flagship and newly

discovered (Q2, 2015) , high -grade, near -surface g old project; Altan Nar – an extensive, high -

grade, near-surface, gold-polymetallic project located 16 kilometres northwest of Bayan Khundii;

Altan Arrow – an early -stage, high -grade gold -silver project 3.5 kilometres north of Bayan

Khundii; Ulaan – a recently-acquired copper-gold porphyry prospect adjacent to Bayan Khundii;

Khuvyn Khar – an early-stage, copper-silver porphyry project; Nomin Tal – a narrow, high-grade

copper-gold discovery; and Zuun Mod – a large molybdenum -copper porphyry deposit. In

addition to the above projects, Erdene has an Alliance with Teck Resources Limited on regional

copper-gold exploration in the prospective Trans Altai region of southwest Mongolia. The Bayan

Khundii and Altan Nar licenses have a 2% net smelter returns royalty (“ NSR Royalty”) in favour

of Sandstorm Gold Ltd. with a buy -back option to reduce the NSR Royalty to 1%. For further

information on the Company, please visit www.erdene.com. Erdene has 161,775,791 issued and

outstanding common shares and a fully diluted position of 185,951,320 common shares.

Forward-Looking Statements

Certain information regarding Erdene contained herein may constitute forward -looking statements

within the meaning of applicable securities laws. Forward -looking statements may include

estimates, plans, expectations, opinions, forecasts, projections, guidance or other statements that

are not statements of fact. Although Erdene believes that the expectations reflected in such

forward-looking statements are reasonable, it can give no assurance t hat such expectations will

prove to have been correct. Erdene cautions that actual performance will be affected by a number

of factors, most of which are beyond its control, and that future events and results may vary

substantially from what Erdene current ly foresees. Factors that could cause actual results to differ

materially from those in forward -looking statements include market prices, exploitation and

exploration results, continued availability of capital and financing and general economic, market

or business conditions. The forward-looking statements are expressly qualified in their entirety by

this cautionary statement. The information contained herein is stated as of the current date and is

subject to change after that date. The Company does not assume the obligation to revise or update

these forward-looking statements, except as may be required under applicable securities laws.

NO REGULATORY AUTHORITY HAS APPROVED OR DISAPPROVED THE CONTENTS OF THIS

RELEASE

Erdene Contact Information

Peter C. Akerley, President and CEO, or

Ken W. MacDonald, Vice President and CFO

Phone: (902) 423-6419

E-mail: [email protected]

Website: www.erdene.com

Twitter: https://twitter.com/ErdeneRes