There is no abstract created for this record

In an area of limited basement outcrop located between 2 and 5 miles north-northwest of Iron Knob township, the Department's surface traverse channel sampling (969'), percussion boring (643’) and diamond drilling (1270’) tested a low grade...

South Australia’s most promising beryl deposits are in the Olary region about 250 miles north-east of Adelaide. Occurrences in other parts of the state are known. Beryl is widespread in small amounts in pegmatite of the Olary region and has been...

There is no abstract created for this record

During the period May 27th - June 21st, 1958, the writer visited Western Australia and by courtesy of the Geological Survey of Western Australia and the Commonwealth Bureau of Mineral Resources was guided to a number of the most important manganese...

Four faunal assemblages are present in the Lower Cretaceous shales and sandstones at Andamooka. Abundant Aptian foraminifera occur in the "toe dirt" immediately below the opal horizon. A notable discovery from recent sampling is that of late...

Sediments tentatively assigned to the Marinoan Series (late pre Cambrian age) unconformably underlie Mesozoic and Cainozoic sediments in the area investigated. Opal is known to occur at three horizons and may occur in a fourth within the Mesozoic...

The use of several reactants for the decomposition of beryl ore, for the recovery of beryllia is described. By sintering mixtures of beryl, limestone, and soda ash at high temperatures, followed by acid leaching, almost total dissolution of the...

There is no abstract created for this record

There is no abstract created for this record

Cowell jade province contains 100 outcrops. The nephrite jade is associated with isoclinally folded dolomitic marble and calc silicate horizon in the upper Gneiss Complex of the Early Proterozoic Cleve Metamorphics. Discusses mining methods and quality.

Enlarged written version of a talk on the geology of opal, its occurrence and mining methods prepared for public presentation.

There is no abstract created for this record

Limestone of (?)Cambrian age and sedimentary breccia of (?)Mesozoic age are suggested for the origin of the opalised rock.

Compilation of Departmental and company records on tenure and production.

Samples contained substantial amounts of staurolite and minor heavy minerals (tourmaline, muscovite, ilmenite, rutile, kyanite and sillimanite), but not abundant enough to be of economic interest.

Beach sands, dunes and selected creek sand were sampled. Kanmantoo Group metasediments that underlie most of the island, basalt and granite are favourable source rocks for heavy minerals. They are being actively eroded along most of the coastline but...

37 thin sections were examined and 3 specimens selected as possibly indicating potential ore deposits. Uncertainty is introduced by extreme variability of the material. The selected specimens contain andalusite as major aluminosilicate mineral. No...

Andamooka Opal Fields, have been major world producer of precious opal since 1933. Opal has formed within a weathered, bleached profile at the interface of white, sandy claystone (Kopi) and underlying, grey brown montmorillonitic clay (Mud) near the...

The Coober Pedy Precious Stones Field is the largest producer of precious opal in the world. The opal is the product of weathering processes and is localised within the weathered profile. It occurs in early Cretaceous marine claystone of the Bulldog...