(ShareCast News) - Natural resources explorer Amur Minerals has received a positive drilling update from its Flangovy programme in Russia.The company said a confirmation drill hole revealed the discovery on the site has extended the resource at the site by approximately 400 metres, adding infilling drilling had resumed and two of the four holes tested confirmed the mineralisation between the other existing drill holes.The update should "add substantially" to the resource inventory of Kun-Manie, the company said in a statement on Wednesday."With the infill programme underway and results confirming our original drill results, we also look forward to a reclassification of the resource at Flangovy," said group chief executive Robin Young."Here we anticipate a substantial upgrade in our Indicated resource class which means these can potentially be fully converted into reserves suitable for a Definitive Feasibility Study."Amur Minerals shares were down 2.07% to 14.20p at 1100 BST on Wednesday.