(Adds details from early trade, updates prices)
* TSX down 29.61 points, or 0.21 percent, to 13,985.53
* Six of the TSX's 10 main groups fall
TORONTO, June 21 (Reuters) - Canada's main stock index
slipped on Tuesday as lower commodity prices weighed on energy
and mining stocks, while industrials also fell after one of the
country's major railways said it expected revenue to decline due
to lower volumes and a major wildfire.
Canadian Pacific Railway Ltd CP.TO slid 2.6 percent to
C$158.85 after warning it expects revenue to fall about 12
percent in the second quarter from a year ago.
Rival Canadian National Railway Co CNR.TO was also among
the most influential decliners, falling 1.8 percent to C$74.16.
The industrials group slipped 1.0 percent.
At 10:35 a.m. EDT (1435 GMT), the Toronto Stock Exchange's
S&P/TSX composite index .GSPTSE was down 29.61 points, or 0.21
percent, to 13,985.53.
Six of the index's 10 main groups were in negative
territory, with decliners outnumbering advancers by 1.5-to-1.
The materials group, which includes precious and base metals
miners and fertilizer companies, lost 1.5 percent as gold and
copper prices fell. GOL/ MET/L
First Quantum Minerals Ltd FM.TO fell 3.5 percent to
C$8.95 and Potash Corp POT.TO lost 1.9 percent to C$21.21.
Oil prices also slipped, ending a two-day rally, with
trading volatile ahead of a Thursday vote in Britain on whether
to remain a part of the European Union. O/R
The energy group retreated 0.5 percent.
The country's big banks and other financial stocks helped
limit the index's fall, with Royal Bank of Canada RY.TO edging
up 0.3 percent to C$78.22 and Brookfield Asset Management Inc
BAMa.TO adding 0.8 percent to C$43.66.
Canada's federal government and its provinces agreed in
principle on Monday to expand the national pension plan in a
compromise that would see premiums raised moderately over time
to provide greater payouts for pensioners.