The local population in Miri has indeed started to extract oil from hand-dug wells for centuries. "Song Huiyao Jigao", a documentation of the Song dynasty of China, mentions the imports of Borneo camphor and petroleum in the 11th century. In 1882, Mr de Crespigny reported to the Brooke government on 18 hand-dug oil wells in the Miri area. He also recommended that area near Miri River should be thoroughly explored. However, his recommendations were ignored. But when Charles Hose took over the Resident office in 1891, he was interested in Mr de Crespigny's idea and began to collaborate with him. Mr de Crespigny began to map oil seeps around the Miri area, however a consultant geologist from England discouraged the oil exploration in Miri due to poor logistical conditions. After his retirement from administrative positions in Sarawak, Charles Hose went back to England. He later went to London to discuss the idea of oil exploration in Miri with the Anglo-Saxon Petroleum Company (later became a part of Royal Dutch Shell Company in 1907). Benjamin, a branch manager from the petroleum company, was interested in this idea. Finally in 1909, Rajah Charles Brooke came to London to sign the first Sarawak Oil Mining Lease. Royal Dutch Shell dispatched a senior geologist named Josef Theodor Erb together with Charles Hose back to Miri. Erb started to map Miri oil fields from August 1909 to July 1910. He also identified a location known as "Miri Hill" (now known as "Canada Hill", above sea level) is suitable to act as an anticline for oil drilling.