"Most of the proven surface ore, totaling about 1,500,000 tons, is of higher grade with a range of 55% to 65% Fe2O3..."

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"The mentioned 1,500,000 tons of high-grade ore could be mine, crushed, sized and shipped without further beneficiation."

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"The point in question is this:  how deep does the ore extend? 

In the view of this past drilling and considering the magnitude of the magnetic anomaly, the writer feels that this deep ore may constitute a substantial addition to the reserves of the deposit."