* A coin is a solid mixture, not a solution. Solutions are homogeneous mixtures where one substance (the solute) dissolves into another (the solvent). Coins are made of metals, which are solid and don't dissolve into each other in the way you'd see with salt dissolving in water.
* Metals in a coin can be considered as alloys. Alloys are mixtures of metals, and sometimes other elements. In this case, the different metals in the alloy could be considered as "components" rather than solute and solvent. For example, a copper coin might have a small amount of zinc in it.
Therefore, it's not accurate to talk about a "solvent" and "solute" in a coin. However, if you want to think of the coin as an alloy, then the major metal (like copper) could be considered the "dominant component," and the other metals (like zinc) could be considered "minor components."
