Olary Creek Township Mine site Main tailings Repository “TSF” 0.5 km Radium Hill Aerial Photograph N.

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Presentation transcript:

Olary Creek Township Mine site Main tailings Repository “TSF” 0.5 km Radium Hill Aerial Photograph N

Main tailings repository & tailings dispersal 0.2 km Aerial Photograph Mine Site Waste rock dumps Projected line of lode & underground workings Crushed waste dumps Former workshops & processing plant N

Remnants of shaft headframe and ore bins

High grade U ore samples from dump material (dark minerals and yellow coatings) Exposure in prospecting pit of U- mineralised rock

Waste rock dump

Crushed rock dumps Note: pepper tree (introduced) and various saltbush species that have taken up U on contaminated areas

Crushed rock Used for manufacture of concrete: buildings and other structures Road base and road surfacing, work area surfacing Bunding for some tailings dams Railway ballast Typically contains >250 ppm U

Effects of dispersion of crushed rock, resulting in large anthropogenic U radiometric anomaly

Crushed rock use in Radium Hill townsite Road surfacing Major concrete constructions

Tailings storage facility Main TSF is about 250 x 150 x 6 m, capped with 1 m soil and subject to rill erosion. It is not a stable landform.

Rill erosion of main TSF to expose mill tailings with >300 ppm U

Gully erosion of small TSF

Dispersal of fine tailings by wind and water erosion (physical, not chemical dispersion) Dunes of wind-dispersed tailings developed prior to capping of main TSF

Contaminated Topsoils – Radium Hill Tailings dam Wind dispersion, particularly to the SE

Soil contamination by windborne tailings, SE of main TSF

Soil chemistry affected by addition of windborne tailings