| 11. | The coal from Bold Colliery was deep mined and therefore costly to recover.
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| 12. | Most of the deep mines ceased operation by 1960.
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| 13. | Both surface mines and deep mines occur in the watershed of Spring Run.
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| 14. | Many of them specialized in pumping the water out of very deep mining shafts.
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| 15. | Later the Cary Salt Works started a 840 ft deep mine south of Winnfield.
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| 16. | He worked at the Witwatersrand Deep Mine on the Transvaal Reef for several years.
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| 17. | The first deep mine in the parish was Mearns Coalworks which began in 1783.
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| 18. | These were in the days before the deep mines appeared penetrating the limestone cap.
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| 19. | Limited deep mining resumed under contractors and contract surface mining continued into the 1990s.
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| 20. | But coal from deep mines could not be counted on for several more years.
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