Sheets QM397 Doubtful Sound and QM417 Preservation : geological resource map of New Zealand 1:250 000

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Christie, A.B.; Doole, M.H. 1989 Sheets QM397 Doubtful Sound and QM417 Preservation : geological resource map of New Zealand 1:250 000. Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey report M 167. 45 p.

Abstract: The Doubtful Sound and Preservation sheet areas lie mostly within Fiordland National Park, except for the Waiau Valley in the southeastern corner of the Preservation Sheet. Although the geologic setting and known mineral occurrences in Fiordland indicate that the area is highly prospective for metallic mineral deposits, mineral exploration has been restricted by the remoteness, rugged topography, and adverse climate, and in recent years by the national park status, of the area. The only recent mining activity has been the extraction of aggregate in the Waiau Valley area. Gold was mined in Preservation Inlet from quartz lodes (233 kg) in Ordovician greywacke and slate, and from Quaternary raised beach deposits (quantity unknown) between 1893 and about 1908. Small quantities of marble (Caswell Sound and Kellard Point), coal (near Puysegur Point), mica (Mt Elwood), and asbestos (Dusky Sound) were also mined in the late 1800s.Magnetitie and ilmenite deposits occur as segregations near the base of Cretaceous gabbroic lenses which intermittently occur along a northerly trending belt extending 95 km from the Murchison Mountains to Mt Aitken. The magnetite contains 1.2 to 1.4% V205. Several deposits have been prospected including those at Mt George, Mt Troup, Wilmot Pass, Lake Hauroko, and the northwest arm of Lake Te Anau.Isolated concordant lenses (fahlbands) and veins of base metal sulphides occur in Paleozoic gneiss, schist, and marble at various locations and have been prospected at Bligh Sound, George Sound, Caswell Sound, Mt Irene, Deep Cove (Brassels Point), Mt Luxmore, Wet Jacket Arm (Docherty’s Wet Jacket mine), Dusky Sound (Park’s Mineral Beds), Mt Solitary, Kathryn Peak, and Preservation Inlet (Bradshaw’s Reef).Minor showings of molybdenum, cassiterite, serpentinite, talc, and nephrite have been noted in the Paleozoic rocks, and detrital occurrences of gold, platinum, ilmenite, garnet, rutile, and zircon occur in many of the coastal beaches. The sparse population, remoteness and national park status limit the requirements for bulk commodities, however there are large resources of limestone, clay, and aggregate available in the Waiau Valley for future requirements. Small thermal springs occur at Anchorage Cove, Irene Valley, and Henry Burn and gas seeps occur at Poison Bay and in the Upper Lill Burn Valley. The thick Tertiary sedimentary sequence of the offshore Solander Basin has been unsuccessfully tested for hydrocarbons by two wells, Solander-1 and Parara-1.