Lead chloride is insoluble in cold water.
Lead would tend to be insoluble in cold acid peroxide,
if gold did dissolve in acid peroxide (high oxidizer too much peroxide)it would precipitate back out when more copper added and oxidizer was overcome, could fall to bottom as brown powder or plate to metal copper still in solution.
Lead chloride is slightly soluble in hot water. silver and gold insoluble, although a boiling solution may be agitated and these powders can take time to settle, if small amounts of lead in powders boiling hot water can be used to dissolve lead chloride.
After collecting a batch of lead powder.
Here is one way I deal with lead powders, after collecting a batch,
HCl/bleach to cover powders and slight excess stir well, some times I use heat, let sit day or so, decant solution may contain gold, dilute and settle filter solution, test for gold and treat solution with precipitant if it does. Depending on gold content may need more than one treatment
Add three times volume of water or more to lead powders, bring solution to boil, lower heat to just below boil, keeping solution hot, letting silver and extra lead settle,(silver chloride is insoluble in hot water, the silver powder will take time to settle), (lead becomes more soluble in boiling hot water, although not all will dissolve only as much as hot water will hold), while this lead water is hot decant liquid to a cooling jar, where the liquid will cool and the more pure lead will precipitate, I raise heat to low boil on pot, after water in cooling jar has cooled and precipitated its lead, I return to boiling mixture and repeat this process, till all lead removed as possible, this lead powder, I rinse and save for use in other processes( lead is a collector in a melt). Can calcine lead at 600 deg C in air to make litharge for mixing with flux.
If you have a small amount of lead and mostly gold it can be cupuled to give gold button, but a lot of lead would take up a lot of cupules
Lead is toxic take precautions.
hope this answers your question, as I am not exactly sure what you meant by how do I deal with lead.