| 11. | Quarrying was first started on the site in the early 1920s.
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| 12. | Threats to the ecosystem of Fowler Mountain include development and quarrying.
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| 13. | Another, in 1975, was the Mining and Quarrying Symposium.
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| 14. | Taihu faces environmental damage from excessive quarrying from the lake floor.
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| 15. | Others had been encountered during topsoil stripping or during quarrying operations.
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| 16. | Gillies Hill currently lies under threat from potential renewed quarrying operations.
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| 17. | Continuing quarrying operations threaten to cause additional pollution of the Brazos River.
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| 18. | Investment continued to rise in the mining, quarrying and petroleum industries.
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| 19. | Many traditional businesses, such as fishing and quarrying would not return.
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| 20. | Traditional economic activities in San Marino were food crops, stone quarrying.
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