Title: Geography of Canada
Content:  Shield are referred to as mountain ranges, including the Torngat and Laurentian Mountains. The Shield cannot support intensive agriculture, although there is subsistence agriculture and small dairy farms in many of the river valleys and around the abundant lakes, particularly in the southern regions. Boreal forest covers much of the shield, with a mix of conifers that provide valuable timber resources in areas such as the Central Canadian Shield forests ecoregion that covers much of Northern Ontario. The Canadian Shield is known for its vast mineral reserves such as emeralds, diamonds and copper, and is there also called the "mineral house".
Title: Canadian Shield
Content:  The Canadian Shield (Bouclier canadien ), also called the Laurentian Plateau, is a large area of exposed Precambrian igneous and high-grade metamorphic rocks (geologic shield) that forms the ancient geologic core of the North American continent (the North American Craton or Laurentia). Glaciation has left the area with only a thin layer of soil, through which the composition of igneous rock resulting from long volcanic history is frequently visible. As a deep, common, joined bedrock region in eastern and central Canada, the Shield stretches north from the Great Lakes to the Arctic Ocean, covering over half of Canada and most of Greenland; it also extends south into the northern reaches of the United States. Human population is sparse and industrial development is minimal, but mining is prevalent.
Title: Canadian Shield
Content:  rises to more than 1,500 metres (5,000 feet) above sea level. When the Greenland section is included, the Shield is approximately circular, bounded on the northeast by the northeast edge of Greenland, with Hudson Bay in the middle. It covers much of Greenland, all of Labrador and the Great Northern Peninsula of Newfoundland, most of Quebec north of the St. Lawrence River, much of Ontario including northern sections of the Ontario Peninsula, the Adirondack Mountains of New York, the northernmost part of Lower Michigan and all of Upper Michigan, northern Wisconsin, northeastern Minnesota, the central and northern portions of Manitoba 
Title: Taiga Shield Ecozone (CEC)
Content:  Primarily wilderness, the Taiga Shield is sparsely populated, with approximately 340,000 inhabitants, over 60% of which is First Nations. Most settled areas developed around mining or hydroelectric activity, for example in Yellowknife and Uranium City in the west and Labrador City in the east, but are isolated from other communities. Mineral extraction is the most important economic activity, with iron being mined in Quebec and Labrador, uranium in Saskatchewan, and gold and more recently diamonds in the Northwest Territories.
Title: Economy of Canada
Content:  most important. Canada also has a sizable manufacturing sector, based in Central Canada, with the automobile industry and aircraft industry being especially important. With the world's longest coastline, Canada has the 8th largest commercial fishing and seafood industry in the world. Canada is one of the global leaders of the entertainment software industry. It is a member of the APEC, G7, G20, OECD and WTO, and was formerly a member of NAFTA until the USMCA came into force in 2020. In Canada, the USMCA is officially known as the Canada–United States–Mexico Agreement (CUSMA) in English and the Accord Canada–États-Unis–Mexique (ACEUM) in French.
Title: Canadian Shield
Content:  The Canadian Shield is a physiographic division comprising four smaller physiographic provinces: the Laurentian Upland, Kazan Region, Davis and James. The shield extends into the United States as the Adirondack Mountains (connected by the Frontenac Axis) and the Superior Upland. The Canadian Shield is a U-shaped subsection of the Laurentia craton signifying the area of greatest glacial impact (scraping down to bare rock) creating the thin soils. The Canadian Shield is more than 3.96 billion years old. The Canadian Shield once had jagged peaks, higher than any of today's mountains, but millions of years of erosion have changed these mountains to 
Title: Canadian Shield
Content:  logging industry. The boreal forest area gives way to the Eastern Canadian Shield taiga that covers northern Quebec and most of Labrador. The Midwestern Canadian Shield forests that run westwards from Northwestern Ontario have boreal forests that give way to taiga in the most northerly parts of Manitoba and Saskatchewan. Hydrologic drainage is generally poor, the soil compacting effects of glaciation being one of the many causes. Tundra typically prevails in the northern regions. Many mammals such as caribou, white-tailed deer, moose, wolves, wolverines, weasels, mink, otters, grizzly bear, polar bears and black bears are present. In the case of polar bears (Ursus maritimus), the Shield area contains many of their denning locations, such as the Wapusk National Park.
Title: Nova Scotia
Content:  silica, peat and barite, is also a significant sector. Since 1991, offshore oil and gas has become an important part of the economy, although production and revenue are now declining. However, agriculture remains an important sector in the province, particularly in the Annapolis Valley. Nova Scotia's defence and aerospace sector generates approximately $500 million in revenues and contributes about $1.5 billion to the provincial economy each year. To date, 40% of Canada's military assets reside in Nova Scotia. Nova Scotia has the fourth-largest film industry in Canada hosting over 100 productions yearly, more than half of which are the products of international film 
Title: Canadian Shield
Content:  from Hudson Bay, northern Saskatchewan, a small portion of northeastern Alberta, mainland Northwest Territories to the east of a line extended north from the Saskatchewan-Alberta border, most of Nunavut's mainland and, of its Arctic Archipelago, Baffin Island and significant bands through Somerset, Southampton, Devon and Ellesmere islands. In total, the exposed area of the Shield covers approximately 8000000 km2. The true extent of the Shield is greater still and stretches from the Western Cordillera in the west to the Appalachians in the east and as far south as Texas, but these regions are overlaid with much younger rocks and sediment.
Title: Geography of Canada
Content:  in the Shield since there is significant evidence that the Sudbury Basin is an ancient meteorite impact crater. The nearby, but less known Temagami Magnetic Anomaly has striking similarities to the Sudbury Basin. Its magnetic anomalies are very similar to the Sudbury Basin, and so it could be a second metal-rich impact crater. The Shield is also covered by vast boreal forests that support an important logging industry. Canada's many rivers have afforded extensive development of hydroelectric power. Extensively developed in British Columbia, Ontario, Quebec and Labrador, the many dams have long provided a clean, dependable source of energy.

Question: what is the main industry in the canadian shield?
Answer: mining.