A small fire occured at the Pinon pit on a dragline. This eqmnt was idled approx. 1 yr ago, we had welders cutting the top off so that we could fill the house with ash, sparks ignited a sm grease pan under the gear case. Fire was extinguish in 1 hr 50 min. Small fire utilized fire extinguisher but re-ignited & called for water truck to fully extinguish.