G. B. Gifford Hull was Resident Engineer on the Jubilee (Shing Mung) Reservoir. His name is inscribed on the memorial stone at the Reservoir which was begun in 1933 and finished in 1937.
http://en.wikipedia.org/wiki/File:HK_ShingMumReservoir_MemorialStone.JPG
While working on the Reservoir in 1935 Hull was panning in a stream at lunch time. He recognized wolframite-rich deposits in sediments being excavated from the Upper Shing Mun river and traced the mineralization to quartz veins on nearby Needle hill. Wolframite is also known as Tungsten.
Hull obtained a mining licence in the same year but the lease was subsequently transferred to Marsman Hong Kong China Ltd. They developed Needle Hill Tungsten Mine. The history of this mine can also be found on gwulo.com
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Gifford Hull in Hong Kong
Hull arrived in Hong Kong in 1932 from Singapore to take up a new appointment with Messrs. Binnie & Partners as Chief Resident Engineer on the construction of the Shing Mun reservoir dams. On this assignment he was given complete authority on both expenditure and construction. This was hailed as a revolutionary decision which worked so well that the whole project was completed 15 months ahead of time and $1.5 million were handed back unspent. "At least in one case," in Hull's own words, "a Colonial Government waived its rules to meet a special and unusual need."
Hull was later involved in the construction of Tai Lam Chung reservoir which opened in 1957.
http://www.icevirtuallibrary.com/content/article/10.1680/iicep.1970.7071