Lord Cairns and Guy Wilson, both recently appointed non execs at Fresnillo (FRES, 405p) have both invested £57,000 each, to initiate a position in the worlds largest silver mine.

I take these purchases with a pinch of salt, as

1. Cairns and Wilson have only recently taken up their positions as non execs (April and July this year respectively).

2. Judging by their age and extensive management history, I suspect £58k is a minimal investment compared to their net worth (see Fresnillo plc website for short bio’s)

I therefore rank these maiden purchases as giving me a WEAK SIGNAL, pending further financial commitment by these two non execs.