Tarcoola. Data release made in lieu of a 25% first partial relinquishment at licence renewal: [Part 1 of 2] progress reports for the period 7/6/1978 to 19/4/1984.
Created: 11 Nov 2024
Revised: 11 Nov 2024
Author: Freytag, I.B.;Yates, K.R.;Ryan, C.R.;Palletti, E.;Poggi, J.P.;Bladier, Y.;Toteff, S.
In 1978 exploratory rotary drilling (11 holes, total 629 m) for inferred sediment-hosted roll-front uranium orebodies buried beneath salt lake topographic depressions east of Tarcoola intersected low levels of uranium (max 14 ppm) at fresh water /...
In 1978 exploratory rotary drilling (11 holes, total 629 m) for inferred sediment-hosted roll-front uranium orebodies buried beneath salt lake topographic depressions east of Tarcoola intersected low levels of uranium (max 14 ppm) at fresh water / brine interfaces in relict deltaic marginal deposits formed where two Tertiary palaeochannels had entered a playa lake. Follow-up seismic refraction and airborne radiometric/magnetic surveys of this Peela Swamp region led to further RC drilling (33 holes, total 1523 m) which intersected lignite and minor base metal anomalism, but failed to upgrade the uranium prospects. Between 1980-82 some earlier indications of stratiform Pb-Zn anomalism in a trough in the Carpentarian age Tarcoola Beds were investigated by field mapping and ground magnetic surveys, and then confirmed by RAB and percussion drilling (117 holes, total 3700 m), but following an interpretation of the drillhole sample geochemistry and metal threshold values it was decided that these occurrences did not warrant further work.
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