Answer: assaying

AnswerCrossword Clue
ASSAYINGTesting
ASSAYINGGauging ore
assayingDetermine the biochemical or immunological activity of (a sample)
assayingAttempt
assayingthe act of testing
assayingDetermine the content or quality of (a metal or ore)
assayingExamine (something) in order to assess its nature