At 25°C, Silver (Ag) = 10.49g/cm^3 and Mercury (Hg) = 13.53g/cm^3

Given this, at STP (25°C, 1atm) Ag would be solid and Hg would be liquid. Therefore they would not be mixing into a solution. I assume these facts to be evident, but I am stating them just to be safe.

Since Ag has a lower density than Hg, the Ag would float on the Hg.

If you have any follow up questions, I will be glad to answer.

Fact checkers:

Densities- https://periodictable.com/Properties/A/Density.al.html

States of matter- https://www.angelo.edu/faculty/kboudrea/periodic/physical_states.htm