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"Given the grade and tenor of recent (infill drilling) results, it is expected that inferred resources will be upgraded in terms of both category and grade," West African Resources said.
The recent hits included 10m grading 54.2g/t from 499m.
Inferred underground resources at M1 South have previously been reported as totalling 350,000 tonnes grading 16.1gpt for 180,000 ounces.
That compares with indicated underground resources of 470,000t at 26.4g/t for 395,000oz.
West African Resources is working on completing an undated feasibility study for Sanbrado by mid-year comprising both opencut and underground mining.
The company has about A$20 million cash.
Shares in West African Resources were off 1% to A$0.435 in early trade today, capitalising the company at A$252 million (US$199 million).
The stock was at levels around $0.26 12 months ago and $0.06 24 months ago.
