a. Said of an inferior or impure rock or mineral, or of an ore deposit
that contains a high proportion of noncommercial material. AGI b. Said of any metal or ore that gives misleading assays or values.
AGI c. Said of a vein or other deposit close to and more or less parallel to a
main vein or deposit, but thinner, less extensive, or of a lower grade.
AGI
Source:
Dictionary of Mining, Mineral, and Related Terms
