| 1. | Placer deposits are formed by alluvial processes within rivers, streams and on beaches.
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| 2. | Good placer deposits were found along Greenhorn Gulch and Boulder Gulch.
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| 3. | The rich placer deposits of the Columbia Basin-Sonora district were found in 1853.
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| 4. | They mine hard rock deposits and placer deposits left by glaciers.
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| 5. | Deeper placer deposits may be sampled by trenching or drilling.
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| 6. | Rarely, but importantly, gold, tin and platinum deposits can form in beach placer deposits.
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| 7. | Opals which have weathered out of the in-place deposits are alluvial and considered placer deposits.
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| 8. | But the placer deposits worked in the early years were quickly exhausted, and production crashed.
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| 9. | The river sand garnet occurs as a placer deposit.
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| 10. | Sedimentary placer deposits are known as'leads'or'deep leads '.
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