1. GL5 Resources Essay 2005 Residual & Placer Q4 MS
Describe and explain how each of the following types of mineral deposits may be naturally concentrated within the ‘surface processes’ part of the rock cycle:
residual deposits
placer deposits [25]

2. GL5 Resources Essay 2005 Residual & Placer Q4 MS
Emphasis on surface processes-weathering, erosion, transport and deposition.
Residual deposits
Bauxite in Jamaica
relate to mineral being dense, unreactive compared to host rock
Host rock is limestone - dissolved away in solution by carbonation
Placers need to be dense
Unreactive
lack cleavage
hard (gold excepted)
Beach placers, stream placers, bench placers
Credit reference to examples eg Cornish Tin, South African Gold
Total 25 marks