Then, changes in the mine plan delayed access to higher-grade material, as well as a slower ramp-up of the DOZ mine, Adkerson expained.
To imagine that private industry, needing to cut costs to the bone, could do a better job at securing massive quantities of bomb-grade material is a fantasy.
The United States and other Western nations have demanded that Iran stopped its uranium-enrichment program, which they perceive as a precursor to production of nuclear warhead-grade material.
No one knows whether this stuff is investment-grade material.
Freeport blamed this drop largely on changes to mine plans at the Grasberg mine in Indonesia, which delayed access to higher-grade material, and a slower-than-expected ramp-up at the Deep Ore Zone underground mind.
The materials then goes through a multi-tiered supply chain where they are sold and possibly resold several times before reaching facilities that specialize in either cutting and polishing gemstones and diamonds, or turning raw precious metal into jewelry-grade material.
One reason why many people distrust nuclear power is because they believe it is impossible to separate civil reactors from weapons-grade fissile material.
The U.S. and its allies are seeking to gain Iran's willingness to suspend its production of near weapons-grade nuclear material at its uranium-enrichment sites in return for economic incentives.
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We do our children no favors when we allow them to pass from grade to grade without mastering the material.
The caliber RM58-01, 34mm in diameter, is supported on a baseplate of grade 5 titanium, a material also utilized for the bridges.
While most are enriching below 20 percent, this material, too could be turned into weapons-grade uranium, although with greater effort than is the case for the 20-percent stockpile.
Silicon, the major raw material used in the manufacture of solar panels, requires an energy-intensive process to turn it into solar-grade silicon.
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