3 Sentences With "more low grade"

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It was the sequel to last week's declaration that they would enrich more low-grade uranium past the stockpile limit of 300kg (20153 pounds) set out by the deal. from CNN
In other words, there is little high grade ore and proportionately much more low grade ore available.
Locomotive numbers 92165–92167 were built with a mechanical stoker, which was a helical screw that conveyed coal from the tender to the firebox, where it would be directed to the required part of the grate by high-pressure steam jets controlled by the fireman. The stoker made higher steaming rates possible, and it was hoped that mechanical stoking might enable the burning of low-grade coal. It was relatively inefficient, and the locomotives used in this trial were rebuilt to the normal configuration. Simply supplying more low grade coal than a fireman could do by hand did not provide efficient burning.