The Globe and Mail reports in its Monday edition that S&P Dow Jones Indices said late Friday that it is adding five companies to the S&P/TSX Composite Index, the broadest measure of the Canadian market, as rising precious metal prices lifted the value of silver and gold firms. The Globe's Andrew Galbraith writes that S&P did not announce any deletions from the index as part of its quarterly review of index components. S&P Dow Jones will add Abrasilver Resource, Avino Silver & Gold Mines, i-80 Gold Corp., Montage Gold, and Americas Gold and Silver to the S&P/TSX Composite Index, the index provider said in a news release. The changes will be effective at the open of markets on March 23. S&P Dow Jones did not announce changes to the S&P/TSX 60, a selection of most of the largest companies in the composite. To determine whether a company should be included in its S&P/TSX Composite Index, S&P Dow Jones uses the "float" -- the value of shares available to the public. Fund managers who track an index need to hold shares in the underlying companies. Materials players have driven strong gains in Canadian markets, with an S&P/TSX subindex tracking the sector roughly doubling last year.