I believe it's copper and gold :)
Oil shale
It was discovered in the region in the 1970s. it spurred economic growth in the neighboring areas of Colorado. however major a discovery it was, the industry declined leading to copper, silver and gold being the most important mineral resource in the Rockies mountain.
Answer:
Samudra Gupta
Explanation:
Because I took the quiz too and i got 5/5
