While the levels detected are said to be "extremely" low, the finding evidences the radioactive plume of contaminated water heading across the Pacific Ocean after the disaster has already reached North America.
The first-ever, geologically-based global assessment of undiscovered copper resources estimates that 3.5 billion metric tons of copper may exist worldwide.
Rather than shoot for the stars, Paul Adams of DJ Carmichael argues that junior miners should focus on more modest projects best suited to maximizing shareholder value.