| 11. | At one time it was the largest hydraulic mine in California.
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| 12. | It later evolved into hydraulic mining when used during the California Gold Rush.
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| 13. | Hydraulic mining was very damaging to the environment on the gulch.
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| 14. | Today the original site of the town has been destroyed by hydraulic mining.
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| 15. | One of the main, and also most destructive methods was that of hydraulic mining.
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| 16. | Hydraulic mining was used to extract clay from the hill.
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| 17. | Hydraulic mining and blast mining renewed interest in the 1850s.
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| 18. | The more advanced techniques of ground sluicing, hydraulic mining and dredging may be used.
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| 19. | This style of hydraulic mining later spread around the world.
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| 20. | These conditions also allowed the transition from simpler placer operations to more efficient hydraulic mining.
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