QUESTION:
Are there any resources on Mars that we can use for later missions?

ANSWER from Cheick Diarra on November 18, 1996:
The Pathfinder mission is an engineering demonstration of our ability to
land payloads on Mars at a fixed cost, and surface mobility. It will carry
instruments to obtain atmospheric data, elemental composition of the rocks
and soil, but it will not investigate the Martian underground for
volatiles such as water. The Mars Global Surveyor will conduct that kind of
investigation from orbit. 

If everything goes as planned, the Surveyor program (about 10 spacecraft), 
will help locate resources we could use during a human flight or return 
robotic flight.