In reply to lordyosch:
Unless you're lucky, your best chance is to go back in (say) August/September and look when the snow has melted. Maybe July this snowless year. A friend lost an axe in an avalanche on Braeriach quite near the semi-permanent snow and we went back in the autumn and found it. Thanks to global warming, we didn't have to wait 50 years for the snow to melt.