Rocky Shore Outlines Major Exploration Advances with the Lucky 13 Gold Zone Discovery and Mosquito Target Horizon at the Gold Anchor Project

Key Highlights of Latest Drilling at Lane Pond and IP Modelling at Mosquito

• At the 11-km-long Lane Pond Gold Target, inaugural drilling in 2026 discovered the "Lucky 13 Gold Zone" within the prolific Appleton Fault Corridor

• Lucky 13 assays included 15.02 m grading 2.04 g/t Au (including 5.00 m at 3.85 g/t Au and 1.00 m at 5.70 g/t Au) beginning at 275.98 metres in Hole LP-26-13

• At the Mosquito Gold Deposit (the "Deposit") and surrounding area, 3D inversions of historical geophysics expanded the targeted area of defining a deposit by more than 60% beyond current area used to define the mineral resource and identified the Mosquito Target Horizon, a potential higher-grade structural gold corridor within and beyond the Deposit

A 5,000-metre drill program has been initiated at the Mosquito Target Horizon to test an area with potential for higher-gold mineralization within and on trend to present mineral resource area limits

TORONTO, ON / ACCESS Newswire / August 20, 2026 / Rocky Shore Gold Ltd. ("Rocky Shore" or the "Company") (CSE:RSG)(OTCQB:RSGLF) is pleased to announce a significant exploration milestone at its 100%-owned Gold Anchor Project. Following the completion of its inaugural 25-hole, 8,086-metre drill program at the Lane Pond Gold Target, the Company discovered the Lucky 13 Gold Zone. Concurrently, modern 3D geophysical modelling at the nearby Mosquito Gold Deposit (the "Deposit") outlined a substantially expanded target footprint and a potential higher-grade corridor within and beyond the Deposit's current limits, where drilling has now commenced (see Map 1 below).

"Our initial campaign at Lane Pond proved that we have a widespread, fertile, orogenic hydrothermal system capable of generating additional gold discoveries like Lucky 13," stated Ken Lapierre, P.Geo., President & CEO of Rocky Shore Gold. "Moving the drill to the Mosquito Target Horizon with 5,000 metres planned allows us to apply this same disciplined structural targeting approach within and beyond the Deposit's established mineral resource area. It's exciting that we are now advancing the Gold Anchor Project on two distinct fronts: unlocking new discoveries at Lane Pond and pursuing clear scale opportunities for resource advancement at Mosquito."

Lane Pond Gold Target: Lucky 13 Gold Zone Discovery

The maiden drill campaign at Lane Pond totalling 8,086 metres in 25 drill holes (with 15 holes reported to date) successfully confirmed gold mineralization across multiple widely spaced drill holes over an interpreted strike length of approximately 1,800 metres and a dip extent exceeding up to 500 metres. Mineralized intervals ranged from 6.38 to 17.02 metres in core length, remaining open in all directions along the broader 11-km-long Lane Pond Gold corridor. Structural upgrading at depth, with increased silicification, quartz stockwork, mineralization, and improved gold grades, is based on drill results to date.

Highlight results below from hole LP-26-13 demonstrated significant structural upgrading and localized high-grade gold values. Please see tables below for complete drill results to date and collar coordinates (also see press release dated August 5^th, 2026).

• 15.02 metres @ 2.04 g/t Au (from deeper brittle-deformed quartz-rich stockwork)

  • Including 5.00 metres @ 3.85 g/t Au

  • Including 1.00 metre @ 5.70 g/t Au

The discovery validates the structural model along the Lane Pond Gold Target and the interpreted regional Appleton Fault Corridor, which spans over 60 kilometres across Rocky Shore's Gold Anchor Project based on current geological interpretation.

Mosquito Gold Deposit: Interpreted New Mosquito Target Horizon

With assay results from Lane Pond still pending, a 5,000-metre drill program has been initiated within and beyond the Mosquito Gold Deposit mineral resource area limits to test a reinterpreted 3D geophysical model. Modern 3D geophysical resistivity inversions indicate that more than 60% of the interpreted intrusive footprint lies outside the currently drilled Deposit limits. The drill program will determine the significance of the Mosquito Target Horizon; a potential high-gradient resistivity transition zone along its east contact continuing southward from the Deposit along a trend for over 600 metres (see Map 2 below).

Next Steps

• Lane Pond: Additional assays will be reported as received to refine the geometry and scale of the Lucky 13 Zone.

Mosquito Target Horizon: A fully funded first phase 5,000-metre drill program at the Mosquito Gold Deposit and surrounding area will test the potential economic significance along the Mosquito Target Horizon and explore the broader intrusive footprint.

Table 1: Drill Assay Summary Table - the length below is estimated to be approximately true thickness.

*Holes 3, 4, 9, 15-18 reported no significant assay results targeting untested geophysical anomalies. Holes 5, 6, 10, 14, 20-25 assays are pending. Hole 21 was abandoned due to caving and did not reach the intended target.

Table 2: Drill Plan Summary Table