12. Economic data

12.1 Polymetallic ore concentrates

Polymetallic ores containing base metals (copper, lead, zinc) represent an important source of precious metals (Au and Ag), and each metal contained has a specific importance depending on its nature and content [9] . Precious metals are beneficial, while Sb, As, Bi, Ti, F, Hg and Se are detrimental to concentrates.

The silver contained in base metal concentrates is subject to smelter-dependent deductions. The silver contained in copper concentrate is the best paid, while lead concentrate pays less, and zinc concentrate even less.