the battery working was reputedly audible from the Coromandel Peninsula, 20 km away. In early 2010, a government proposal to remove 705 ha of land on the Te Ahumatā Plateau (called "White Cliffs" by the locals) from Schedule 4 of the Crown Minerals Act, which gives protection from the mining of public land, was widely criticised. Concerns were that mining for the suspected $4.3 billion in mineral worth in the area would damage both the conservation land as well as the island's tourism economy. Locals were split on the project, some hoping for new jobs. If restarted, mining at White Cliffs would occur in the same area it originally proliferated on Great Barrier. The area's regenerating bushland still holds numerous semi-collapsed or open mining shafts where silver and gold had been mined. Kauri logging The kauri logging industry was profitable in early European days and up to the mid-20th century. Forests were well inland, with no easy way to get the logs to the sea or to sawmills. Kauri logs were dragged to a convenient stream bed with steep sides and a driving dam was constructed of wood, with a lifting gate near the bottom large enough for the logs to pass through. When the dam had filled, which might take up to a year, the gate was opened and the logs above the dam were pushed out through the hole and swept down to the sea. The logging industry cut down large amounts of old growth, and most of the current growth is younger native forest (around 150,000 kauri seedlings were planted by the New Zealand Forest Service in the 1970s and 1980s) as well as some remaining kauri in the far north of the island. Much of the island is covered with regenerating bush dominated by kanuka and kauri. Other industries Great Barrier Island was the site of New Zealand's last whaling station, at Whangaparapara, which opened in 1956, over a century after the whaling industry peaked in New Zealand, and closed due to depletion of whaling stocks and increasing protection of whales by 1962. Another small-scale industry was kauri gum digging, while dairy farming and sheep farming have tended to play a small role compared to the usual New Zealand practice. A fishing industry collapsed when international fish prices dropped. Islanders are generally occupied in tourism, farming or service-related industries when not working off-island. Shipwrecks The remote