| 31. | Hydraulic mining reached its heyday in the 1870s.
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| 32. | Thousands of acres of rich farmland and property were destroyed as a result of hydraulic mining.
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| 33. | In 1916 hydraulic mining was banned in California.
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| 34. | He was known as a wise investor as well as the inventor of the hydraulic mining method.
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| 35. | In 1850, more than 1, 000 miners lived here, and the hydraulic mining scars are still visible.
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| 36. | It included hydraulic mining to prospect for ore by removing overburden as well as work alluvial deposits.
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| 37. | Hydraulic Mine at Manson's Creek 1901Robert Howell panned more than 20 ounces of gold in two hours.
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| 38. | Confederate Gulch saw large scale hydraulic mining.
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| 39. | Hydraulic mining required water, lots of it.
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| 40. | Prospectors spread out across the peninsula, with hydraulic mining undertaken in the Pinnel River in the preserve.
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