Miners look for specific kinds of quartz in order to locate possible sources for gold. From LearnThat.org.
He had had experience in quartz-mining before he went to. From Wordnik.com. [Chapter IX] Reference
He had had experience in quartz-mining before he went to Alaska, and he enjoyed the recrudescence of his old wisdom in such matters. From Wordnik.com. [Chapter IX] Reference
Getting gold from the veins is called quartz-mining. From Wordnik.com. [The Western United States A Geographical Reader] Reference
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