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.

香港馬鞍山鐵礦洞因為無利可圖，於1978年停產，經過數十年建設、緃橫交錯的礦坑隧道網自此被遺棄。礦車主動力建於海拔110米，另一進出口則在240米，現時礦洞已成為愛好探險人士的樂園，探險者通常都在以上兩個進出口進內。