Answer:
metals and minerals
Step-by-step explanation:
The Canadian shield was the name of a region that is located in North-Eastern part of Canada. The water and soil quality in this region is generally unsuited for agriculture, but this area possess large quantity of metals and minerals
This made Canadian Shield became the major producer for mining related companies. (Especially producers of coppers, Gold, Nickels, Zinc, and Diamond.) This region alone accounted for more than 20% of Canadian's economy.