https://www.itnews.com.au/news/xstrata-readies-bulga-coal-mine-for-digital-radio-318353
Xstrata readies Bulga coal mine for digital radio - iTnews
Implementation to begin at the end of the year.
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https://www.woodmac.com/reports/coal-bulga-underground-coal-mine-16462911/
Bulga (Underground) coal mine Report | Wood Mackenzie
underground coal minebulgareportwoodmackenzie