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Drilling will go to an average depth of 140m within the Shady Camp, T9 and Munna Creek projects.
The company is targeting resources of 20-30 million tonnes from drilling including 5Mt of high-quality coking coal.
Tiaro has stakes in six Queensland coal permits.
In February, Tiaro announced plans for a joint venture coal-trading operation with China Qinfa Group and that it would spend the profits on its coal project portfolio.
Shares in the junior are unchanged at 29c.
