We should conserve the natural resources because it may utilize in the future.
And three measures to conserve resource are -
1- we should use the resource as much its use.
2- dont misuse the resource. It may use in the future.
3- save resource save generation.
We are rapidly consuming mineral resources that requires  millions of year to be created and concentrated if we use mineral resources continuously then there are no resources left for our coming era.
to conserve it
we must used mineral in a planned and suistanable manner 
we should do recycling of minerals 
improved technology need to be constantly evolved.