In this paper the more obvious features of the primary tin mineralisation pattern of West Malaysia are noted. Then the various major types of primary deposit, which are the dominant units of the pattern, are broadly described, and their distribution, particularly with respect to the granitic masses, is considered. The distribution of certain varieties of cassiterite and of other tin-bearing species is also commented on. A tentative history of development of the pattern is presented and mention is made of the tin-barren/tin-product granite question in the light of this hypothesis. 00
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The geomorphic setting of the stanniferous placers of SW England is presented and the history of their development is broadly drawn. In particular, the relationships between the placers and the major types of primary tin deposit in the region are emphasized. The nature and genesis of three placer deposits in the N St Austell district are treated in some detail in order to demonstrate the complexity of placer development in the region as a whole. Stress is placed on an examination of the placer cassiterite morphology to determine the complex genesis of the Cornish deposits. Finally, it is emphasized that the initial stages of placer development in the region are due essentially to processes of disintegration, with processes of decomposition never playing more than a very minor role.
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