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The S&P/ASX 200 index added 7.6 points to 5,518.9 at the close of trade.
The benchmark finished flat on Tuesday.
Boart Longyear slumped 34.8 percent to a record low of A$0.088 after the company said it had engaged restructuring advisers in a long-running strategic review.
New Zealand's benchmark NZX 50 index finished flat at 5,114.2.