This video shows you how to the the 3rd and last secret (the gold skull) in the Kingdom level of Tomb Raider II: The Golden Mask.

In the golden cave look to the ceiling to find out which spots are safe and which aren't. I used the grenade launcher against the snow leopard as it tends to push Lara into the molten pyrite (the golden stuff, wich has the nickname fool's gold - hence the name of an earlier level of this add-on).