The Big Gossan skarn ore deposit, located around 1 km south-west of the Ertsberg skarn ore deposit, and 2 km south of the Grasberg porphyry Cu-Au deposit. The ore deposits is skarn ore deposit type with very high copper grade. By the end of 2007, ore reserve of Big Gossan is 52.7 million ton with grade mean of Cu 2.31%, Au 1.1 gr /ton and Ag 14.75 gr/ ton. The Big Gossan ore deposit form tabular pattern dimension...
Sunday, November 14, 2010
Where are deltas found?
Deltas can occur in lakes and inland seas as well as in the ocean, but they are most important in the open ocean (Boggs). Deltas are particularly common in the modern ocean owing to post-Pleistocene sea-level rise coupled with high sediment loads carried by many rivers. They often contain extensive wetlands, whose high biological productivity makes them vital nursery grounds for fisheries. Huge amounts of coal, oil, and natural...
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