IsoEnergy Stakes Six New Uranium Exploration Properties in the Eastern Athabasca Basin

IsoEnergy Stakes Six New Uranium Exploration Properties in

the Eastern Athabasca Basin

Vancouver, BC, May 26, 2020 – IsoEnergy Ltd. (“IsoEnergy” or the “Company”) (TSXV: ISO; OTCQX: ISENF) is pleased

to announce the acquisition through staking of six new uranium exploration properties totaling over 57,000ha in the

prolific Eastern Athabasca Basin of Saskatchewan (Figure 1). All of the new claims are 100% owned by IsoEnergy.

New Property Summary:

1. Hawk: 6,000ha located 37km west of Larocque East, home of the Hurricane Zone

2. Clover: 24,000ha with over 40km of electromagnetic (EM) geophysical conductors

3. Tower: 6,300ha located 11km southeast of the Cigar Lake uranium mine

4. Trident: 9,500ha located along the eastern basin margin 8km south of the Rabbit Lake uranium mill

5. Gemini: 5,800ha located along the eastern basin margin 60km northeast of the Key Lake uranium mill

6. Spruce: 6,000ha located along the southern basin margin immediately west of the Evergreen property

With the addition of these newly staked properties, the Company now has 21 uranium exploration properties in the

Eastern Athabasca Basin. Including some recently staked extensions to existing properties, the total area of

IsoEnergy’s uranium exploration mineral tenure in the Athabasca basin is now 1 70,700ha. Historical work on all of

the new claims, particularly airborne and ground geophysical surveys and core drilling , will be compiled and

integrated with IsoEnergy’s existing datasets. As the company’s focus is currently the Hurricane zone, there is no

plan to conduct fieldwork on any of these newly staked claims in 2020 and there is no regulatory requirement to do

any fieldwork until 2022.

Steve Blower, Vice President of Exploration commented: “ These properties have been on our radar for some time,

and with the uranium price gaining momentum we elected to secure the tenure now. Every one of these properties

has good uranium exploration potential given the presence of drill -ready targets on conductive features and/or

proximity to known deposits.”

Hawk Property

The 6,000ha Hawk property was staked to cover an area of low magnetic susceptibility (mag low) indicating the

presence of prospective metasedimentary rocks in the basement. Within the mag low there is over 16km of

northeast-southwest and east -west EM conductors that suggest the presence of favourably oriented graphitic

gneisses (Figure 2). Only one historical drill hole has ever been completed on the property. Unconformity depth is

expected to be 600-700m.

Clover Property

A total of 24,000ha of new claims were staked to cover over 40km of northeast oriented EM conductors (Figure 3)

within mag lows at the Clover property. Despite the long strike length of conductive basement rocks, there are only

three historical drill holes on this large property. Depth to the unconformity is expected to be 700-800m.

Tower Property

The Tower property is characterized by significant relief in regional airborne magnetic datasets , including the

presence of northeast oriented mag low anomalies. These features suggest a complex structural history which is

favourable for the formation of uranium deposits. Importantly, the property is located only 11km southeast of the

Cigar Lake uranium mine (Figure 4).

Trident Property

Trident is located along Hwy 905 along the eastern rim of the Athabasca basin, 8km south of the Rabbit Lake uranium

mill (Figure 5). The claims were staked to cover four different trends of EM conductors, all of which are just outside

the basin margin. Therefore, there is no sandstone cover on the Trident property and the target will be basement

hosted uranium mineralization. Several mineral occurrences are documented, including a uraniferous boulder field

that is partly on the property, plus an outcrop of unconformity-related pitchblende mineralization.

Gemini Property

The Gemini property is also located along the eastern basin margin, 31km southwest of the Company’s East Rim

property, and 60km northeast of the Key Lake uranium mill. The tenure was acquired to cover previously located

EM conductors and a radioactive muskeg occurrence under very thin sandstone cover (0 -100m). A property map is

shown in Figure 6.

Spruce Property

The Spruce property covers parts of three conductive trends immediately west of the Evergreen property (Figure 7).

Like many of the Company’s new properties, sandstone cover is very thin (0 -100m) and there are known uranium

and uranium pathfinder occurrences nearby.

Figure 1 – New IsoEnergy Staking

Figure 2 – Hawk Property Map

Figure 3 – Clover Property Map

Figure 4 – Tower Property Map

Figure 5 – Trident Property Map

Figure 6 – Gemini Property Map