arbitrage
Minco Gold indicates it has 43 mil shares, 48 mil fully diluted.
And owns 13 million shares of Minco Silver
Thus, assuming a stock price of 2.80 for Minco Silver, the value of Minco Gold's stake in Minco Silver is:
2.80*(13/43) = 85 cents
2.80*(13/48) = 76 cents fully diluted
So it appears you are not quite getting gold for free but pretty darn close.