Overview

Spain:

  Salamanca I
  Salamanca II
  Caceres I
  Caceres II
  Caceres III
  Caceres VI
  Guadalajara I

Australia:

  Miriam Bouchers

This area is situated in the northeastern part of Guadalajara province, some 100 km from the provincial capital. It is located in hill country of the Iberian Cordillera at an elevation of some 1200-1250m (Figure 1).

The permit covers 436 km² and includes a State Reserve on the zone with most of the sandstone hosted mineralisation. Rio Alagon has entered discussions with the authorities to have the reserve lifted.

Geology

Discordantly overlying the Paleozoic bedrock is a thin and irregular sequence of sandstones and red-coloured shales with occasional conglomeratic bands. This sequence ranges up to 60m in thickness, is frequently traversed by porphyritic dykes and is considered to be Permian in age. It is overlain by a thick Mesozoic sequence which, in this area, consists essentially of sediments of Triassic and Jurassic age.

Within the Triassic, the three traditional divisions of the continental, or Germanic, sequence can be recognised - Bund, Muschelkalk, Keuper - albeit with unequal development.

The Bund is made up of predominantly red-coloured clastic sediments. There is a basal conglomerate followed by fining-upward sequences of sandstones and shales with conglomerate levels. The succession has a variable thickness but it is in the order of 500 m in the principal area of interest.

The Muschelkalk consists of an underlying essentially fine-grained detritic sequence with marls and shales, and an overlying carbonate sequence with limestones and dolomites.

The Keuper includes red to multicoloured shales and marls with gypsum horizons. The sequence is some 100 m thick. The transition with the Jurassic is marked by a sequence of banded dolomites and dolomitic breccias.

Uranium Occurrences

The primary mineralisation consists of pitchblende and other unspecified black oxides. It is frequently associated with sulphides. Secondary minerals are relatively uncommon and include autunite, uranocircite, carnotite, torbenite and traces of zeunerite. The mineralisation is considered to be related to reduction-oxidation (redox) fronts.

Mineralisation extends in a belt for some 25 km between Luzon and Cobeta. The mineralised bodies are vaguely stratified, but have a lenticular or irregular shape. The length of individual bodies range from several tens to 1,200 metres. Width varies from 80 to 300 m. and thickness from less than one metre to six metres.

Berkeley Resources Ltd.
Level 9, BGC Centre, 28 The Esplanade Perth,
Western Australia 6000