The following outside resources are available for download in PDF format and require Adobe Reader.
To download a file, please right-click on the link and select ‘Save Target As’.
- OPAL Mineral Information Leaflet – QLD Govt. Dept. of Mines & Energy – October 2000.
- Opal Minfact – NSW Department of Primary Industries – January 2000.
- Strategic Assessment of the Australian Opal Industry – by David Horton (Opal Horizon) May 2001.
- Australian Sedimentary Opal – Why is Australia Unique? – by David Horton December 2002.
- What you should know about buying opal – Jewellery Association of Australia
- The origin of precious opal – by Byron Deveson
- Opal mining in Lightning ridge, review of environmental factors – NSW Dept. of Primary Industries
- Mining at Lightning Ridge – NSW Dept. of Mineral Resources