[taregg (OP)]

What type of chemical reactionis that involved extraction of metal from its ore ....

[Bored chemist]

Almost always a reduction.

[taregg (OP)]

 i mean which type of chemical reaction  is it ...combination or
decompostion or single replacement
or double displacement

[CliffordK]

Isn't a lot of smelting taking an oxide and reacting it with carbon (or carbon monoxide).

Iron Oxide + Carbon --> Iron + Carbon Dioxide

As BC said, the Iron is reduced.  The Carbon is oxidized.