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Dominion, Volume 18, Issue 90, 11 January 1924, Page 7

The mining field at Puhipuhi, some four miles from Whakapara, between Whangarei and Russell, has already produced mercury, gold, silver and antimony (savs an exchange). , Tho most recent spoil from this area is a siliceous deposit of thousands of tons, on a face of 30 feet high, which lends itself to a remarkable number of uses. Dr. McLaurin. Government analyst, reports that the deposit contains from 82 to 90 per cent, of silica, the grains of which are globular, and therefore ideal for polishing purposes,. About eight ner cent, of alumina is present, and 1.6 rer cent, of'iron oxide, which 'tFfc onh* flaw. No trace of lime or alkali is present, and ih’o loss upon ignition is 5.6 per cent., the claw being without chemical in itself and rihsolutclv harmless. Being of such composition, it is a first-class polish, but there are many other uses to which it can be put.