Why is most silver produced as a by-product of lead copper or zinc mining?

Most silver is produced as a by-product of lead, copper, or zinc mining because silver is rarely the primary constituent in ore deposits. While silver is widely distributed in nature, it is typically found in sulfide minerals associated with these base metals.12

Approximately 75 percent of global silver production is derived from ores mined primarily for their lead, copper, or zinc content. Because these ores naturally contain silver-bearing minerals—such as argentite—the silver is recovered as a by-product during the extraction and refining processes used for the major metals. For example, in the processing of zinc concentrates, silver is often collected within lead bullion, which is then sent for further refining. Only about 25 percent of the world's silver comes from mines where silver is the primary metal value.123