Sentinel Resources Announces Successful Lithium Test Well Results

VANCOUVER, Sept. 29, 2021 - Sentinel Resources Corp. (CSE: SNL) (US OTC PINK: SNLRF) ("Sentinel" or the "Company") and joint venture partner Hub City Minerals Corp. ("HCM") are pleased to announce the completion of a multi-layer perforation and swab test of a vertical wellbore strategically located on one of HCM's Subsurface Crown Mineral Dispositions located in Saskatchewan. Laboratory testing returned lithium concentrations in the Duperow formation up to 96.3 mg/l., which exceeded the Company's target of 74.6 mg/l.

Results from the Test Well

The target Wymark zones of the Duperow tested as follows:

Rob Gamley, CEO of Sentinel Resources, commented, "We are very pleased with the favourable lithium concentrations in our brine sampling. Our next steps will include high-volume flow testing, which is expected to occur on or before October 31, 2021. We are looking forward to ongoing positive results of this work as we advance this highly prospective lithium brine project."

Lithium Brine Properties Joint Venture

The lithium brine properties consist of 21 permits totaling 119,739 acres (48,457 hectares) of Subsurface Crown Mineral Dispositions in the Williston basin of Southern Saskatchewan. Two independent laboratories (Isobrine Solutions (Edmonton, AB) and AGAT Laboratories (Calgary, AB) were engaged to analyze multiple zones of interest and measure lithium concentrations present in the formation brine. Within these zones, the targeted intervals returned lithium concentrations up to 96.3 mg/l.

Sentinel holds 67% of the joint venture with HCM holding the 33% balance.

Qualified Person

The technical content of this news release has been reviewed and approved by Greg Bronson, P. Geo., a qualified person for the purpose of National Instrument 43-101.

About Sentinel Resources

Sentinel Resources is a Canadian-based exploration company focused on the acquisition and exploration of mineral projects with significant development potential. Its current portfolio includes precious metals projects located in New South Wales, Australia and lithium exploration projects in Saskatchewan, Canada.

For more information, please go to the Company's website at www.sentinelexp.com.

Forward-Looking Statements

Information set forth in this news release contains forward-looking statements that are based on assumptions as of the date of this news release. These statements reflect management's current estimates, beliefs, intentions and expectations. They are not guarantees of future performance. Sentinel cautions that all forward-looking statements are inherently uncertain, and that actual performance may be affected by a number of material factors, many of which are beyond Sentinel's control. Such factors include, among other things: risks and uncertainties relating to Sentinel's limited operating history, ability to obtain sufficient financing to carry out its exploration and development objectives on its mineral properties, obtaining the necessary permits to carry out its activities and the need to comply with environmental and governmental regulations. Accordingly, actual and future events, conditions and results may differ materially from the estimates, beliefs, intentions and expectations expressed or implied in the forward-looking information. Except as required under applicable securities legislation, Sentinel undertakes no obligation to publicly update or revise forward-looking information.

Neither the Canadian Securities Exchange ("CSE") nor its Regulation Services Provider (as that term is defined in the policies of the CSE) accepts responsibility for the adequacy or accuracy of this news release.

SOURCE Sentinel Resources Corp.