eye assay

eye assay

[′ī ′as‚ā]
(mining engineering)
An estimate of the valuable mineral content of a core or ore sample as based on visual inspection. Also known as eyeball assay.
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References in periodicals archive ?
In the cited papers, there was no, however, made evaluation of enzyme activity by a camera because a naked eye assay and another type of substrate were preferred.
There were about a hundred souls assembled, and Jeffrey's seasoned eye assayed the political temper of the throng.