On the other hand other quartz-free nuggets of superior fineness (e.g. Au 96.5 Ag 3.5 wt. ) enclose pisolitic laterite concretions or other soil detritus. Earthy haematitic inclusions near the edge of some nuggets have expanded during hydration and burst open the otherwise solid gold.
Read MoreThe laterite profiles attain a thickness of 600 m on slates 300 m on carbonatites and 80 km on kimberlites. The final weathering products are bauxites Al-Ti-Fe laterites and Fe-Mn ochres enriched in REE (up to 50 Ln 2 O 3 and 1 Y 2 O 3 ) Nb (up to 5 Nb 2 O 5 ) Ti (up to 32 TiO 2 ) Th (0.1–0.4 ThO 2 ) as well as Ba P. Zn and V.
Read MoreGet started with a subscription today. China s Aluminium Value Chain Quarterly Update is an independent and detailed assessment of the key metrics of China s bauxite alumina and primary aluminium industries as we see them presented in the form of an easily digestible set of charts and tables together with relevant commentary on significant events emerging trends and other key
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