This from the PR
"Lower grade deposits mean less margin between profit and break even. Tailings costs often can make the difference between a go or no-go decision in terms of developing a mine," said John Key, Vice President, Projects for Whitney & Whitney, Inc. Whitney & Whitney markets the Rock Kleen technology for Itronics. "When additional metals/minerals are profitably recovered and tailings become a revenue component of the total revenue stream instead of a major cost, potential resources that were sub-grade ore can now become profitable to mine."
Seems like ITRO will be enabling more miners to keep producing or start producing and not relying on those tailings that are accessible by rail. Not just only focusing on hauling cleaned tailings to their production site.