yes bojangler thats how I understand it being difficult to scrape out, not familiar with the term rill though.
When I last spoke to NK remember him saying tailings was not a problem. Plenty of cavities inside the mine they can return tailings to, also he mentioned what Robert was saying about there being suitable sites close to the mine, also mentioned an area close to Jericho (spelling) where tailings could go when high levels of production were needed for greater storage., tailings seem to be a non issue. I guesss they could also be used for roading however they are probably to fine for that.
Whats your engineering qualification ? I am a journeyman millwright (retired) for union 102 out of Oakland California
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