The idea that transported material can be traced to a primary 'mother lode' is from certain kinds of gold deposits. It doesn't apply to base metals/sulphides. You can't assume the presence of a second hydrothermal deposit from the presence of a first. You can only assume disseminated ore: the source of the hydrothermal transported/concentrated ore. They are all "primary sulphides". Secondary minerals are oxidised.
Ann: Assays Confirm Discovery, page-258
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