* Ontario government adds C$100 million support for Algoma Steel * Algoma Steel hit hard by U.S. tariffs under Trump administration * Loan part of $10 billion aid to large companies against tariffs (Adds details, background from paragraphs 4-8) OTTAWA, Sept 29 (Reuters) – Canada's government is to provide C$400 million ($287.13 million) in financial support for Algoma Steel under its large enterprise tariff relief scheme, Jobs Minister Patty Hajdu said on Monday. The company has been one of the large steel enterprises worst hit by the 25% tariffs U.S. President Donald Trump slapped on Canadian imported steel, a duty he later cranked up to 50%. The loan will help Algoma Steel, which employs around 2,500 people in Ontario, continue operations, transition to a business model less reliant on t

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