Bulletin of the Geological Society of Malaysia, Volume 17, Dec.1984, pp. 237 – 255
OMRD Sabah Bhd, Mamut Mine, Sabah
Abstract: The Mamut deposit in northwestern Sabah is of porphyry copper type, that produces a larger amount of gold and silver as associated constituents than normal porphyry copper deposits.
Exploration activities at Mamut and its vicinity were started in 1965 with detailed geochemical soil surveys by the United Nations Labuk Valley Project team after the completion of a reconnaissance geochemical stream sediments survey in the Ranau-Mt. Kinabalu area. The Mamut deposit was assessed for its grade and lateral extent by diamond drilling by the Geological Survey of Malaysia, followed by further detailed systematic exploration and exploitation programmes by the Overseas Mineral Resources Development Company of Japan.
The success of the exploration programmes and subsequent development of the Mamut deposit has demonstrated the effectiveness of reconnaissance geochemical survey by stream sediment sampling and detailed grid soil sampling in delineated targets for a drilling programme. Grid drilling and subsequent development of the mine revealed the ore deposit to coincide with the most intensely anomalous area of both soil geochemical and IP surveys. The deposit lies approximately within the area of soil copper content greater than 300 ppm and above 10% of frequency effect.