Suggest you do a bit of reserch on a pile of failed narrow vein operations ( heg MCO GBD TAM )for starters and one semi sucsesfull narrow vein mining operations( SLR.) reserch there drill results and mill head grades and compare them to AUL , and you may just find out that it take a lot of bloody good results to overcome the mediocre ones to provide a high enough head grade to remain proffitable.
Ann: Over 100 g/t gold from Drilling at Rose of Denmark, page-34
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