A metallurgist's sample is a piece of ORE that is used to analyze the composition of a mineral deposit. It is typically taken from a mine or quarry and examined in a laboratory to determine the presence of valuable metals. The crossword solution for METALLURGIST'S SAMPLE is ORE, which is an acronym for 'Original Rock Extract'. This term is used to describe the raw material that is extracted from the earth and processed into usable metals.