Description from http://shawweb.myzen.co.uk/

GEM GRABBER TI BASIC. By R Trueman. GBP 5.00 

Your task is to tunnel your way to reach 5 gems.
You have limited explosives You must avoid abandoned explosives and falling rocks (which are both visible). 
This is not a game of chance: you must plan your route carefully! (But NOT a difficult game).
Several screens.