Assuming 30 trading days horizon, Shoshone Silver Mining Company is expected to under-perform the Atlantic. In addition to that, Shoshone is 1.09 times more volatile than Atlantic Coal PLC. It trades about -0.27 of its total potential returns per unit of risk. Atlantic Coal PLC is currently generating about -0.14 per unit of volatility. If you would invest 46.00 in Atlantic Coal PLC on April 26, 2012 and sell it today you would lose (14.00) from holding Atlantic Coal PLC or give up 30.43% of portfolio value over 30 days.
Diversification
Weak diversification
Overlapping area represents amount of risk that can be diversified away by holding Shoshone Silver Mining Company and Atlantic Coal PLC in the same portfolio (assuming nothing else is changed)
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