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The ball mill, which previously operated at the Rustenberg chromite mine, has rated capacity of 820,000 tonnes per annum.
Theta's previous feasibility work envisaged a 500,000tpa operation producing about 40,000 ounces per annum at all-in sustaining costs of $764/oz and involving peak capex of $29 million.
The latter anticipated a new mill, with Theta suggesting today a brand new mill equivalent to the one it has now bought would cost about A$5.5 million.
Theta owns a 240,000tpa CIL plant outside the town of Pilgrim's Rest in Mpumalanga province, 300km northeast of Johannesburg.
The ASX-listed company's total headline resources in the region number 6 million ounces, with a first stage development seen as being the foundation for a much longer, much larger production play.
Theta, which recently promoted at the Denver Gold Forum, completed an $8 million raising last week, with new shares priced at 15c each.
Shares in the company closed yesterday at that price, capitalising Theta at $52 million.
