high-grade

[hahy-greyd]
adjective
1.
of excellent or superior quality.
2.
(of ore) yielding a relatively large amount of the metal for which it is mined.
verb (used with object), high-graded, high-grading.
3.
to steal (rich ore) from a mine.

Origin:
1875–80

high-grader, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
See-through shelving made from high-grade plywood defines a shower area without
  walling it off.
The growth of solar firms has outpaced the supply of high-grade silicon needed
  to make their panels.
But it is becoming more and more difficult to find high-grade deposits that are
  cheaply and easily mined.
In this decade, high-grade uranium ores will deplete significantly, leaving the
  industry to resort to low-grade ores.
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