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

3 wells were drilled to supply the saline side of the proposed dual water supply system. Test-pumping indicated long term yields of 0.4 to 0.9 L/s. 1 of the wells (IND26) has salinity of 900 mg/L. If its salinity does not rise, it should be connected...

The EVERARD sheet covers the NE Officer Basin and the Musgrave Complex in an area with about 220 mm annual rainfall. The crystalline basement rocks yield small supplies (median yield about 0.2 L/s), chiefly from fracture zones. Saprolite yields very...

Mintabie water supply comes from a well in the opal workings which are on a small plateau. Six SADME wells and a number of private wells have failed to find an alternative supply. Wells on the lower lying areas yield small supplies of saline water....

In South Australia, the intracratonic eastern Officer Basin, which may contain up to 10 km of Neoproterozoic to Paleozoic sediments, is bounded by the Precambrian Gawler Craton to the southeast, the Musgrave Block to the north, and passes into...

This technical assessment of petroleum prospectivity and attendant exploration risk for the eastern Officer Basin was prepared by SAOGC staff to help management decide the merits or otherwise of making a PEL application for vacant acreage gazetted by...

AIM:The 1974 Everard Seismic Survey consisted of a detailed grid of 103 km over the Munyarai prospect, and a regional tie line of 54 km with outcrops at the rim of the Officer Basin, to investigate the possibility of a prospective Ordovician sequence...

Burial history analysis of the structurally complex eastern Officer Basin region was performed using data from petroleum, trona exploration and stratigraphic wells, seismic upholes, coal drillholes and selected seismic sections, to construct isopachs...

The extension of railways through Eyre's Peninsula, and the opening up of the country to agricultural settlement has made the problem of water supply a matter of grave concern to the Government of South Australia. Large centrally situated reservoirs,...

Pronounced positive and negative geophysical anomalies on EVERARD represent the crystalline Musgrave Block in the north, a basement trough more than 4 km in depth that flanks the Musgrave Block to the south, and the crystalline Ammaroodinna Inlier to...

A groundwater survey of areas of Mimili Station, within and around the Everard Ranges in North West South Australia, indicates that there are reasonable prospects for finding supplies of stock water in fine grained alluvial materials which form broad...

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Aerial photography, satellite imagery, geological maps and on-ground geological and geophysical (transient electromagnetic) investigations were used in early 1998 to select drilling sites for additional water wells to supply Indulkana township in the...

Agnes Creek is located near the eastern outcrop margin of the Proterozoic Musgrave Province, which is composed predominantly of amphibolite to granulite facies meta-igneous and metasedimentary gneisses of the Birksgate Complex. Geochronological...

South Australia's famous desert opalfields supply about 80% of the world output of precious opal, with current production coming almost entirely from the major fields at Andamooka, Coober Pedy and Mintabie, each of which is expected to increase output...

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Mintabie Opalfield, one of the most important production centres in Australia, was discovered in the early 1920s but mining only began in earnest in 1976. Precious opal is confined to Mintabie beds, a kaolinitic sandstone of presumed Ordovician Age,...

This document presents an integration and summary of all new data, and a consolidation of current concepts and ideas on the geological and structural history, sedimentary features and petroleum potential of the Officer Basin in South Australia. Many...

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