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Situated 3km off the coast, Karamuramu Island in the Hauraki Gulf has been a source of a reddish brown mudstone called chert or Jasper, or McCallum Chip since 1908. Used as a decorative stone for paving slabs, sealing chips and exposed aggregate, the light and extremely resilient stone is quarried by McCallum Brothers Limited and is then carried by barges to nearby Auckland. The quarry has a reserve of rock in excess of several million cubic meters, but will never completely disappear. In order to preserve the profile of the island extensive planting of the outer shell using native plants has been underway for many years.