Name this movie please!!!!

Ok i have been trying to find the name of this movie that i have watched a couple times when i was younger!. I saw it in the 90's!. Its about this brother and sister that were living in Africa(or visiting i don't remember) , and their uncle (i think) was killing elephants for Ivory!. the kids found out about it and he wanted to kill them!. So they ran into the desert with their African bushman friend who escorted them through to the ocean, while all the time the uncle was trying to find them and kill them!. And at the end of the movie they blow up a cave full of ivory dusk's and the uncle dies in side, while trying to stop the explosion!. please someone tell me the name of the movie!Www@Enter-QA@Com

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