The Windfall coal occurrence is located near Windfall Creek about 52 kilometres west of Tumbler Ridge.

Coal seams 0.19 to 1.49 metres true thickness occur in the Upper Jurassic-Lower Cretaceous Minnes Group interbedded with sandstones, siltstones and carbonaceous mudstones. Four seams were intersected in rotary-drill holes WF-81-01 and WF-81-07 to depths greater than 122.74 metres and 59.23 metres, respectively. The thickest seam was intersected in drillhole 81-07 and is approximately 1.49 metres true width (Coal Assessment Report 693). Many of the exposed seams which were trenched contain clastic partings and are dull.

In the Windfall block of coal licenses, the Lower Cretaceous Gething Formation (Bullhead Group) sediments consist of predominantly fine to medium-grained sandstones with a monotonous appearance. The sandstones are quartz-lithic and often contain an abundance of plant casts. Carbonaceous mudstones and siltstones also constitute a significant portion of this formation. While numerous coal seams have been identified in the Gething Formation on the Goodrich-Lossan block of coal licenses (093O 050) located 39 kilometres northwest; none have, however, been located on the Windfall block to date (ca. 1981).

The structure consists of a faulted, northwest trending, moderately folded synclinorium. The faults also trend northwest and dip southwest and include the normal Merrick fault in the southwest, the Windfall fault in the centre of the property and two thrust faults in the southeast. A major thrust fault to the west of the property places Triassic sediments adjacent to Lower Cretaceous strata.

In 1979 and 1980, a reconnaissance mapping program was undertaken by Gulf Canada Resources Inc. In 1981, Gulf Canada conducted an exploration program consisting of geological mapping, hand trenching (19) and drilling. Seven rotary-drill holes were attempted but only three holes were completed for a total of 940.7 metres. Coal seams were intersected in all three drillholes.