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* TSX dips 0.24 pct a day after hitting record
* Six of 10 main groups in index decline
* Industrials retreat 0.6 pct
By Fergal Smith
TORONTO, Dec 28 (Reuters) - Canada's main stock index dipped on Thursday, backing off the previous session's record high as declining industrial and gold mining shares weighed, offsetting gains for the energy group.
* At 10:34 a.m. ET (15:34 GMT), the Toronto Stock Exchange's S&P/TSX composite index fell 38.23 points, or 0.24 percent, to 16,164.9.
* The industrials group fell 0.6 percent, with Waste Connections Inc declining 1.5 percent to C$88.47.
* The materials group, which includes precious and base metals miners and fertilizer companies, lost 0.5 percent as gold mining shares fell.
* Eldorado Gold Corp declined 3.4 percent to C$1.73.
* One of the biggest drags on the index was Brookfield Infrastructure Partners LP, which fell 2.8 percent to C$56.20 after rallying on Wednesday. Earlier in the week the company announced an agreement to sell its Chilean regulated transmission business for $1.3 billion.
* The overall utilities group slipped 0.9 percent. It was one of six of the TSX's 10 main groups that fell.
* Energy shares rose 0.3 percent, supported by the recent rally in oil prices.
* Oil prices stood near their highest in two and a half years, supported by strong data from top importer China amid thin trading activity ahead of the New Year weekend.
* The largest percentage gainer on the TSX was Canopy Growth Co, which rose 6.5 percent, The stock was adding to gains it made on Wednesday after a ruling by regulators that boosted the shares of marijuana companies.
* Open Text, rose 5.5 percent to C$44.07 after S&P Dow Jones Indices announced after the bell on Wednesday that the stock will be added to the S&P/TSX 60, 60 Capped and 60 Equal Weight Indices to replace Agrium Inc.
* Declining issues outnumbered advancing ones on the TSX by 125 to 116, for a 1.08-to-1 ratio on the downside.
* The index was posting 6 new 52-week highs and 1 new low. (Reporting by Fergal Smith; Editing by David Gregorio)