-
RB 80/00026 Opal in South Australia.
Enlarged written version of a talk on the geology of opal, its occurrence and mining methods prepared for public presentation.-
Document
Published: 01 May 1980
-
RB 80/00038 Vesuvius opal diggings.
Small quantities were mined from 1977 to 1978. The opal infills joints in leached and weathered Cretaceous shale. Considerable potential exists for further small finds of opal.-
Document
Published: 01 May 1980
-
RB 84/00047 Origin and formation of matrix opal from Andamooka, South Australia.
Two specimens were probably formed by partial dissolution of Andamooka Limestone erratics within Cretaceous marine sandy clay, followed by replacement of the remaining carbonate rock by fine grained silica together with growth and deposition of silica...-
Document
Published: 01 Jul 1984
-
RB 83/00007 Coober Pedy Opalfields - Results of the subsidised exploration programme, 1981.
221 shafts were drilled. Precious opal or potch was found in 11 shafts and good sandstone prospective for opal in 34 shafts. A new field, Southern Cross, was established subsequent to the discovery of potch in subsidised shaft 85.-
Document
Published: 01 Mar 1983
-
RB 79/00006 Opal at the Stuart Creek, Charlie Swamp and Yarrawurta Cliff diggings. Report no. 12 on geological investigations and Calweld drilling of the Stuart Creek Precious Stones Field.
Small quantities of precious opal have been mined from sediments of the Early Cretaceous Marree Formation at Stuart Creek, 50 km north of Andamooka. These sediments appear to have been unaffected by the Early Tertiary deep weathering and bleaching...-
Document
Published: 01 Jan 1979
-
RB 78/00086 Andamooka Opalfields. A geological guide for the opal prospector.
During May - September 1978, 66 shafts were sunk under subsidised mining programmes to encourage testing of new areas. The new fields of Stans Hill and Yarloo West were established subsequent to the discovery of opal in Shafts 17 and 49.-
Document
Published: 01 Jan 1978
-
RB 80/00104 Discovery of Early Cretaceous sediments at Mintabie Opalfield.
This note records the discovery of previously unrecognised Early Cretaceous fossiliferous sediments unconformably overlying Palaeozoic rocks at the Mintabie opal field. Following renewed mining activity at Mintabie in 1977-78, the Mineral Resources...-
Document
Published: 01 Sep 1980
-
RB 80/00103 Lambina opal diggings.
Small quantities of precious opal have been mined 1977-79. Opal and potch occur as opaline-silica cement within Cretaceous sandstone lenses, and as thin seams and fracture infillings within Cretaceous claystone, clasts and vein infillings within...-
Document
Published: 01 Jun 1980
-
RI 051 Andamooka Opal Fields The Geology of the Precious Stones Field and The Results of the Subsidised Mining Program
Since discovery of the opal field in 1930, Andamooka, 640 km by road north of Adelaide, has been a major world producer of precious opal. All workable opal at Andamooka has been found in the Marree Formation, a sequence of marine sediments of...-
Document
-
Tertiary geology of the Coward Cliff area, between Lake Eyre and Lake Torrens, South Australia.
There is no abstract created for this record-
Document
Published: 01 Jan 1979
-
Geology of the Stuart Creek - Charlie Swamp area, northern South Australia.
As a B.Sc. Honours project with the Geology Department of the University of Adelaide, which was sponsored by the South Australian Department of Mines and Energy, the author during 1978 carried out geological mapping of a nearly 400 square km area...-
Document
-
Aspects of the geology of the Stuart Creek area, north of Lake Torrens.
There is no abstract created for this record-
Document
Published: 01 Jan 1978
