Gold FLOW SHEET

In some placer operations with fine gold, where the black iron also carries free gold values, a different flow sheet has to be set up. Jigs are used to save this iron. The "hutch" product from the jig is put over concentration tables to clean the iron.

In a case like this, a rag plant ahead of the jigs and concentrating tables will scalp off 80 to 90% of the free gold recovered, with a very small amount of iron and gangue saved on the carpet.

This product from the carpet is cleaned on a small concentrating table. The table products are dried and put over the magnetic separator.

The jig-table concentrate is ground and generally cyanided if the tonnage is great enough, or is amalgamated if it is a small amount.

Another rag plant is used to protect the tails coming from both the tables and the jigs. This rag plant would not have to be cleaned as often as the rag plant ahead of the jigs, since most of the gold value has been scalped off. The product from this rag plant is processed the same as the rag plant at the head of the operation.

On page 29 the term "insul" is used. This is a long-used milling term, well understood by mining and milling men, but perhaps needing additional explanation. It probably should be "insol", for insoluable. Gangue, or impurity, is another synonym.