| 31. | Outdoor exhibits include live burros, a steam shovel, and an operating stamp mill for gold ore.
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| 32. | The ore was crushed in a fifteen-stamp mill.
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| 33. | In the 19th and early 20th centuries, many metal mines used stamp mills to process ore-bearing rock.
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| 34. | A ten stamp mill was built in the late 1890s and a 12 stamp mill in 1904.
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| 35. | The mine closed in 1916 and about a year later a fire destroyed its 20 stamp mill.
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| 36. | He formed the California King Gold Mines Co . with speculator's money and built a stamp mill.
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| 37. | Langlaagte Stamp Mill in Main Street Johannesburg
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| 38. | The town had one ten head stamp mill operating the Austin mine just outside town in 1895.
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| 39. | Mining operations consisted of at least one shaft, a stamp mill, and some form of amalgamation recovery.
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| 40. | A ten stamp mill was built in the late 1890s and a 12 stamp mill in 1904.
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