silver and lead are insoluble as chlorides (both white powder), tin is soluble (but makes filtering nightmare's).
silver chloride is insoluble in cold or hot water, but lead chloride is insoluble in cold water but slightly soluble in boiling hot water.
silver chloride can take time to settle.
boiling the silver and lead chloride powders in water, lowering to hot but no boil giving time for silver to settle, decant hot lead chloride solution (on cooling will form lead chloride salt again).
this makes it sound simple, it will not be so simple, and may need several re-crystalizations to separate totally, silver will settle in hot solution but only slowly, so keeping the temperature up so lead is soluble and letting silver salts settle is challenging.