Gold Rush Practice Exam 2026 – Complete Test Prep Guide

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In the Merrill-Crowe refining step, what are doré bars?

Unrefined gold-silver alloy bars produced from the precipitation process

Doré bars are the unrefined gold-silver alloy produced when zinc is added to the cyanide solution and gold and silver precipitate as a metal mixture. They contain gold and silver along with impurities and must be refined further to recover pure metals. They’re not pure gold, not zinc ingots, and not refined silver bars.

Pure gold bars

Zinc ingots

Refined silver bars

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