Here's why:

* Mineral Resources: The Canadian Shield is known for its abundance of minerals, including:

* Iron ore: Significant deposits in Labrador and Ontario.

* Nickel: Major deposits in Sudbury, Ontario.

* Copper: Found in various locations across the Shield.

* Gold: Extensive deposits in Ontario, Quebec, and Northwest Territories.

* Diamonds: Discovered in the Northwest Territories.

* Uranium: Important deposits in Saskatchewan and Ontario.

* Hydroelectric Power: The numerous rivers and lakes within the Canadian Shield provide a significant source of hydroelectric power, crucial for Canadian energy production.

* Forestry: Vast boreal forests cover much of the Shield, providing timber and other forestry resources.

* Tourism: The Shield's rugged landscape, lakes, and wildlife attract tourists, contributing to the economy.

While the Canadian Shield is a highland region with a rocky terrain, it's far from devoid of natural resources. Its vast mineral wealth, hydroelectric potential, and other resources have played a significant role in Canada's economic development.