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dressing on the foreshore of Sham Wan (1156 2000). Stone cutting can also be seen in coastalgranite exposures on islands such as Kau Yi Chau, Cheung Chau and Siu A Chau. The Chi MaWan peninsula, with outcrops of even textured medium-grained granite, has been extensivelyexploited along'its coast. Both Sha Chau and Tree Island in the northwest of the district have alsobeen sources of building stone.Aggregate production for construction has been confined to a small, temporary quarry at ShamWan on northwest Tsing Yi. The quarry was active during construction of the road across theisland, and is now moribund.Borrow areas in the district were, until recently, restricted. They can be found on east and southTsing Yi, and in the Barren Hills near Mui Wo. Urban and golf course development at DiscoveryBay, and shipyard development in Penny's Bay, have resulted in borrows in these areas. Thelargest borrow area in the district involved the reduction of Chek Lap Kok to about 8 mPD forthe airport development. The borrow started in 1991, and the project also resulted in additionalborrows on The Brothers islands, in northwest Tsing Yi and in northeast Lantau Island.152