| 41. | Additionally, 9 stamp mills were in operation.
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| 42. | In 1915, a stamp mill was built.
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| 43. | By 1882, a 5-stamp mill was operating.
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| 44. | Stamp mills were invented in Europe in the 1600s to crush ore to extract minerals, especially gold.
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| 45. | Working 150 men, the two rapidly opened up the Bonanza King and put up a 20-stamp mill.
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| 46. | After completing his studies in 1840, he immediately became a stamp mill inspector in the civil service.
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| 47. | The Bald pulverizer had been started previously and run a short time, but was not a stamp mill.
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| 48. | After 1850 the small and scattered stamp mills and ore washeries were replaced by central ore dressing plants.
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| 49. | After the installation of the twenty stamp mill, water supplies were insufficient for efficient operation of the mill.
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| 50. | Stamp mills were used by Islamic Spain and North Africa in the west to Central Asia in the east.
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