Hong Kong Ma On Shan Iron Mine was abandoned in 1978, because then unprofitable. An extensive network of tunnels is buried under the hill. A 2.2-kilometre long haulage drive was constructed at the 110 metre level, and other entrance at 240 metre level. Mined tunnel networks, now become a hobby explorer's paradise.
Yunnan Province in southwest China border, the provincial capital Kunming. Warring States period, this is the Dian tribe fowl. Yunnan, namely, "Caiyunzhinan"and the other argument is that because in the "Yunling of the South " is named. The total area of about 39 million square kilometers, accounting for 4.11% of total land area, the provincial administrative regions in the country ranked No. 8 in the area. The total population of 45,130,000 (2008), accounting for 3.36% of the population, the population ranked 13th. And Yunnan provinces adjacent to Sichuan, Guizhou, Guangxi, Tibet, Yunnan Province, three neighboring countries of Myanmar, Laos and Vietnam. Tropic of Cancer crosses from the southern province.