| 1. | Quartz mining predominated but there was some placer mining as well.
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| 2. | In 1860 the Croydon Reef was discovered and quartz mining commenced.
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| 3. | Later Ophir became the center of quartz mining in the county.
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| 4. | Another major mine is The Sovereign Hill Quartz Mine which produces quartz.
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| 5. | With the prosperity brought by quartz mining, Sutter Creek became a boomtown.
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| 6. | San Jos?del Golfo has abundant natural resources, with traditional quartz mining.
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| 7. | The Sovereign Quartz Mine runs 40 minute guided tours and features several underground displays.
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| 8. | A silicon producer, Simcoa, has a quartz mine close to the town.
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| 9. | There was a dock with an advanced system for packaging and freezing fish, and several quartz mines.
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| 10. | Mining in Placerville began with placer workings for gold, but miners soon turned to quartz mining as well.
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