stocks in canada were down midtrading tuesday continuing their roller coaster ride with the sptsx composite index down 26889 points in step with its counterparts south of the border investors are feeling more riskaverse ahead of the us federal reserve policy meeting turquoise hill resources ltds shares rose after it said a deal was struck to allow the delayed expansion of the oyu tolgoi copper mine in mongolia to push ahead canadas sptsx composite index was down 146 at 2027351 and the bluechip sptsx 60 fell 141 to 123346 torontolisted shares in turquoise hill resources ltd rose 16 to c2212 after the company and majorityowner rio tinto reached an agreement with mongolias government that will see the start of underground operations at the mine in the south gobi desert galiano gold inc shares fell 12 to c081 after it said ore delivery at its ghana jointventure operation continued to be slow in the fourth quarter and the companys gold output for the year failed to meet its revised guidance in 2021 the asanko gold mine is a 5050 joint venture with southafrica based gold fields ltd