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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.-
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Published: 01 May 1980
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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.-
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Published: 01 May 1980
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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.-
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Published: 01 Mar 1983
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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...-
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Published: 01 Jan 1979
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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.-
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Published: 01 Jan 1978
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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...-
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