Mr. Jason Gigliotti reports

SIENNA RESOURCES RECEIVES DRILL PERMIT ON THE "CASE LAKE WEST CESIUM AND SPODUMENE PEGMATITE PROJECT" IN ONTARIO BORDERING POWER METALS CORP.'S CESIUM DEPOSIT

Sienna Resources Inc. has received the drill permit on its 100-per-cent-owned Case Lake West cesium and spodumene pegmatite project in Ontario. The Case Lake area of Ontario is one of the most highly prospective regions for cesium in North America. Management cautions that past results or discoveries on properties in proximity to Sienna may not necessarily be indicative of the presence of mineralization on the company's properties.

Jason Gigliotti, president of Sienna Resources, stated: "We are very pleased to receive our drill permit. We want to thank the Ontario government as well as our first nations partners on this exciting first step towards a much larger goal of finding a new cesium discovery. We anticipate being able to commence drilling shortly. When you consider that this project directly borders Power Metals Corp., whose shares have increased an amazing 85 per cent in just the past 12 trading days based on their Case Lake deposit news, we couldn't be more excited about getting this drill permit in hand and getting boots on the ground as soon as the driller can be mobilized. This is at a time when the junior markets are showing significant strength as we are moving into a phase of significant growth. These next few weeks/months will be a watershed mark for Sienna as we commence our first drill program in a long time."

The Case Lake cesium project, owned by Power Metals, is a highly prospective lithium, cesium and tantalum (LCT) project in Northeastern Ontario, Canada. Here are some of the highlights:

• High-grade mineralization: Recent drilling programs have consistently confirmed high-grade cesium mineralization, with standout results including up to 20.67 per cent cesium oxide (Cs2O). Exceptional tantalum grades of up to 5,328 parts per million have also been recorded.
• Shallow mineralization: The cesium mineralization is often found at shallow depths, which could make the project more economically viable.
• Multielement potential: In addition to cesium, the project also contains significant lithium and tantalum mineralization, further enhancing its value.
• World-class asset: The Case Lake project is considered a world-class asset due to the high grades and significant size of the deposit.
• Strategic importance: The project's high-grade cesium and tantalum resources are strategically important for meeting the growing global demand for these critical minerals in advanced technologies.

Over all, the Case Lake Cesium project is a promising project with the potential to become a significant supplier of cesium, lithium and tantalum.

About Sienna Resources Inc.

Sienna has significantly increased acreage of the Stonesthrow gold project, consisting now of approximately 31,718 contiguous acres prospective for gold. Sienna has also recently acquired the Case Lake West cesium and spodumene pegmatite project in the Larder Lake mining division of Ontario, Canada, roughly 100 kilometres north of Kirkland Lake, Northeastern Ontario. This project consists of approximately 7,850 contiguous acres prospective for cesium and spodumene pegmatites. Sienna has also just acquired the 10,357-acre Uranium Town project bordering Denison Mines Corp., the now 23,134-contiguous-acre Dragon uranium project bordering Cameco Corp. and the 55,440-acre Atomic uranium project in the world-renowned Athabasca basin of Saskatchewan. Also, Sienna has the Elko lithium project in Elko county, Nevada, consisting of approximately 1,830 contiguous acres directly bordering Surge Battery Metals' Nevada North lithium project in Elko county, Nevada, which announced the highest-grade lithium deposit in the United States. Sienna is also one of the larger landholders in Clayton Valley, Nevada. Sienna's Clayton Valley projects include the Blue Clay lithium project, the Silver Peak South project and the Clayton Valley Deep Basin lithium project. Clayton Valley is home to the only lithium production in North America, being Albemarle Corp.'s Silver Peak deposit. This project is also near Tesla Motors Inc.'s Gigafactory in Nevada. On March 18, 2021, Schlumberger New Energy Venture announced the development of a lithium extraction pilot plant with a strategic partnership with Pure Energy. Management cautions that past results or discoveries on properties in proximity to Sienna may not necessarily be indicative of the presence of mineralization on the company's properties.

Qualified person

Frank Bain, PGeo, a qualified person as defined by National Instrument 43-101 has reviewed and approved the scientific and technical disclosure contained within this news release.

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