| 31. | By 1960, 1500 miles of underground workings were in the Kirkland Lake camp and 12 miles of direct hoisting shafts.
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| 32. | The quarry prospered for a while, but then profitability declined, and in 1900, a large section of the underground workings collapsed.
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| 33. | It has been mined on a small scale in the past and the underground workings have proved to be valuable drill sites.
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| 34. | Underground production at Maenofferen ceased during November 1999 and with it the end of large-scale underground working for slate in north Wales.
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| 35. | The new find is located about two kilometers south-east of the Darlot mine and 1.2 kilometers from the existing Darlot underground workings.
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| 36. | Based on a review of the data there is no evidence of underground workings along the proposed line or at tower bases.
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| 37. | Kempe and Matthews developed the underground workings, and Kellow recommended that ?5, 000 of the capital should be used for this purpose.
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| 38. | Development work started in 1986, but along with the residual Cynheidre underground workings, closed in January 1989 while employing 1, 043 men.
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| 39. | Students from the School of Engineering were largely responsible for the renovation of the underground workings that were made safe for tourists.
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| 40. | There is no access to the underground workings within the museum, but a simulated gallery provides full accessibility for blind and disabled visitors.
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