July 5 (Reuters) - A wildfire in northern Alberta that

forced Suncor Energy ( SU ) to shut in some oil sands

production has not moved closer to any infrastructure, Alberta's

wildfire agency said on Friday, although it added that crews

expect another challenging day.

Suncor, Canada's second-largest oil company, temporarily

curtailed some production and evacuated non-essential workers

from its 215,000 barrel-per-day (bpd) Firebag site on Wednesday

because of a fire roughly eight kilometres (5 miles) away.

The Calgary-based company did not specify how much

production was shut in but said Firebag will be kept ready to

resume full output as soon as conditions were safe.

Alberta Wildfire said the out-of-control blaze about 70

kilometres (43 miles) northeast of the oil sands hub of Fort

McMurray, is around 12,000 hectares (29,700 acres) in size.

"Yesterday, there was no significant growth towards any

infrastructure," the agency said in a statement.

However the eastern flank of the fire, furthest from

Firebag, grew significantly, Alberta Wildfire added.

There are 142 firefighters and 14 helicopters tackling the

blaze, including two that can fly at night.