1) An analyst who assays metals 2) Analyst 3) Analyst of a kind 4) Analyst of a sort 5) Busy fellow in a gold rush 6) Certain analyst 7) Figure in a gold-rush town 8) Gold rush VIP 9) Gold tester 10) Gold-dust expert 11) Metal tester 12) Mineral measurer 13) One analyses metals 14) Ore analyzer 15) Ore expert 1) Analyst 
• (n.) One who assays. Specifically: One who examines metallic ores or compounds, for the purpose of determining the amount of any particular metal in the same, especially of gold or silver.
As·say'er noun One who assays. Specifically: One who examines metallic ores or compounds, for the purpose of determining the amount of any particular metal in the same, especially of gold or silver. 
[n] - an analyst who assays (performs chemical tests on) metals
assayer An analyst who assays (performs chemical tests on) metals.
noun an analyst who assays (performs chemical tests on) metals
The person responsible for assessing and insuring the purity and quality of precious metal, jewelry and coinage.